|
|
@@ -0,0 +1,12806 @@
|
|
|
+/*
|
|
|
+** 2001-09-15
|
|
|
+**
|
|
|
+** The author disclaims copyright to this source code. In place of
|
|
|
+** a legal notice, here is a blessing:
|
|
|
+**
|
|
|
+** May you do good and not evil.
|
|
|
+** May you find forgiveness for yourself and forgive others.
|
|
|
+** May you share freely, never taking more than you give.
|
|
|
+**
|
|
|
+*************************************************************************
|
|
|
+** This header file defines the interface that the SQLite library
|
|
|
+** presents to client programs. If a C-function, structure, datatype,
|
|
|
+** or constant definition does not appear in this file, then it is
|
|
|
+** not a published API of SQLite, is subject to change without
|
|
|
+** notice, and should not be referenced by programs that use SQLite.
|
|
|
+**
|
|
|
+** Some of the definitions that are in this file are marked as
|
|
|
+** "experimental". Experimental interfaces are normally new
|
|
|
+** features recently added to SQLite. We do not anticipate changes
|
|
|
+** to experimental interfaces but reserve the right to make minor changes
|
|
|
+** if experience from use "in the wild" suggest such changes are prudent.
|
|
|
+**
|
|
|
+** The official C-language API documentation for SQLite is derived
|
|
|
+** from comments in this file. This file is the authoritative source
|
|
|
+** on how SQLite interfaces are supposed to operate.
|
|
|
+**
|
|
|
+** The name of this file under configuration management is "sqlite.h.in".
|
|
|
+** The makefile makes some minor changes to this file (such as inserting
|
|
|
+** the version number) and changes its name to "sqlite3.h" as
|
|
|
+** part of the build process.
|
|
|
+*/
|
|
|
+#ifndef SQLITE3_H
|
|
|
+#define SQLITE3_H
|
|
|
+#include <stdarg.h> /* Needed for the definition of va_list */
|
|
|
+
|
|
|
+/*
|
|
|
+** Make sure we can call this stuff from C++.
|
|
|
+*/
|
|
|
+#ifdef __cplusplus
|
|
|
+extern "C" {
|
|
|
+#endif
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** Facilitate override of interface linkage and calling conventions.
|
|
|
+** Be aware that these macros may not be used within this particular
|
|
|
+** translation of the amalgamation and its associated header file.
|
|
|
+**
|
|
|
+** The SQLITE_EXTERN and SQLITE_API macros are used to instruct the
|
|
|
+** compiler that the target identifier should have external linkage.
|
|
|
+**
|
|
|
+** The SQLITE_CDECL macro is used to set the calling convention for
|
|
|
+** public functions that accept a variable number of arguments.
|
|
|
+**
|
|
|
+** The SQLITE_APICALL macro is used to set the calling convention for
|
|
|
+** public functions that accept a fixed number of arguments.
|
|
|
+**
|
|
|
+** The SQLITE_STDCALL macro is no longer used and is now deprecated.
|
|
|
+**
|
|
|
+** The SQLITE_CALLBACK macro is used to set the calling convention for
|
|
|
+** function pointers.
|
|
|
+**
|
|
|
+** The SQLITE_SYSAPI macro is used to set the calling convention for
|
|
|
+** functions provided by the operating system.
|
|
|
+**
|
|
|
+** Currently, the SQLITE_CDECL, SQLITE_APICALL, SQLITE_CALLBACK, and
|
|
|
+** SQLITE_SYSAPI macros are used only when building for environments
|
|
|
+** that require non-default calling conventions.
|
|
|
+*/
|
|
|
+#ifndef SQLITE_EXTERN
|
|
|
+# define SQLITE_EXTERN extern
|
|
|
+#endif
|
|
|
+#ifndef SQLITE_API
|
|
|
+# define SQLITE_API
|
|
|
+#endif
|
|
|
+#ifndef SQLITE_CDECL
|
|
|
+# define SQLITE_CDECL
|
|
|
+#endif
|
|
|
+#ifndef SQLITE_APICALL
|
|
|
+# define SQLITE_APICALL
|
|
|
+#endif
|
|
|
+#ifndef SQLITE_STDCALL
|
|
|
+# define SQLITE_STDCALL SQLITE_APICALL
|
|
|
+#endif
|
|
|
+#ifndef SQLITE_CALLBACK
|
|
|
+# define SQLITE_CALLBACK
|
|
|
+#endif
|
|
|
+#ifndef SQLITE_SYSAPI
|
|
|
+# define SQLITE_SYSAPI
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+** These no-op macros are used in front of interfaces to mark those
|
|
|
+** interfaces as either deprecated or experimental. New applications
|
|
|
+** should not use deprecated interfaces - they are supported for backwards
|
|
|
+** compatibility only. Application writers should be aware that
|
|
|
+** experimental interfaces are subject to change in point releases.
|
|
|
+**
|
|
|
+** These macros used to resolve to various kinds of compiler magic that
|
|
|
+** would generate warning messages when they were used. But that
|
|
|
+** compiler magic ended up generating such a flurry of bug reports
|
|
|
+** that we have taken it all out and gone back to using simple
|
|
|
+** noop macros.
|
|
|
+*/
|
|
|
+#define SQLITE_DEPRECATED
|
|
|
+#define SQLITE_EXPERIMENTAL
|
|
|
+
|
|
|
+/*
|
|
|
+** Ensure these symbols were not defined by some previous header file.
|
|
|
+*/
|
|
|
+#ifdef SQLITE_VERSION
|
|
|
+# undef SQLITE_VERSION
|
|
|
+#endif
|
|
|
+#ifdef SQLITE_VERSION_NUMBER
|
|
|
+# undef SQLITE_VERSION_NUMBER
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Compile-Time Library Version Numbers
|
|
|
+**
|
|
|
+** ^(The [SQLITE_VERSION] C preprocessor macro in the sqlite3.h header
|
|
|
+** evaluates to a string literal that is the SQLite version in the
|
|
|
+** format "X.Y.Z" where X is the major version number (always 3 for
|
|
|
+** SQLite3) and Y is the minor version number and Z is the release number.)^
|
|
|
+** ^(The [SQLITE_VERSION_NUMBER] C preprocessor macro resolves to an integer
|
|
|
+** with the value (X*1000000 + Y*1000 + Z) where X, Y, and Z are the same
|
|
|
+** numbers used in [SQLITE_VERSION].)^
|
|
|
+** The SQLITE_VERSION_NUMBER for any given release of SQLite will also
|
|
|
+** be larger than the release from which it is derived. Either Y will
|
|
|
+** be held constant and Z will be incremented or else Y will be incremented
|
|
|
+** and Z will be reset to zero.
|
|
|
+**
|
|
|
+** Since [version 3.6.18] ([dateof:3.6.18]),
|
|
|
+** SQLite source code has been stored in the
|
|
|
+** <a href="http://www.fossil-scm.org/">Fossil configuration management
|
|
|
+** system</a>. ^The SQLITE_SOURCE_ID macro evaluates to
|
|
|
+** a string which identifies a particular check-in of SQLite
|
|
|
+** within its configuration management system. ^The SQLITE_SOURCE_ID
|
|
|
+** string contains the date and time of the check-in (UTC) and a SHA1
|
|
|
+** or SHA3-256 hash of the entire source tree. If the source code has
|
|
|
+** been edited in any way since it was last checked in, then the last
|
|
|
+** four hexadecimal digits of the hash may be modified.
|
|
|
+**
|
|
|
+** See also: [sqlite3_libversion()],
|
|
|
+** [sqlite3_libversion_number()], [sqlite3_sourceid()],
|
|
|
+** [sqlite_version()] and [sqlite_source_id()].
|
|
|
+*/
|
|
|
+#define SQLITE_VERSION "3.38.2"
|
|
|
+#define SQLITE_VERSION_NUMBER 3038002
|
|
|
+#define SQLITE_SOURCE_ID "2022-03-26 13:51:10 d33c709cc0af66bc5b6dc6216eba9f1f0b40960b9ae83694c986fbf4c1d6f08f"
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Run-Time Library Version Numbers
|
|
|
+** KEYWORDS: sqlite3_version sqlite3_sourceid
|
|
|
+**
|
|
|
+** These interfaces provide the same information as the [SQLITE_VERSION],
|
|
|
+** [SQLITE_VERSION_NUMBER], and [SQLITE_SOURCE_ID] C preprocessor macros
|
|
|
+** but are associated with the library instead of the header file. ^(Cautious
|
|
|
+** programmers might include assert() statements in their application to
|
|
|
+** verify that values returned by these interfaces match the macros in
|
|
|
+** the header, and thus ensure that the application is
|
|
|
+** compiled with matching library and header files.
|
|
|
+**
|
|
|
+** <blockquote><pre>
|
|
|
+** assert( sqlite3_libversion_number()==SQLITE_VERSION_NUMBER );
|
|
|
+** assert( strncmp(sqlite3_sourceid(),SQLITE_SOURCE_ID,80)==0 );
|
|
|
+** assert( strcmp(sqlite3_libversion(),SQLITE_VERSION)==0 );
|
|
|
+** </pre></blockquote>)^
|
|
|
+**
|
|
|
+** ^The sqlite3_version[] string constant contains the text of [SQLITE_VERSION]
|
|
|
+** macro. ^The sqlite3_libversion() function returns a pointer to the
|
|
|
+** to the sqlite3_version[] string constant. The sqlite3_libversion()
|
|
|
+** function is provided for use in DLLs since DLL users usually do not have
|
|
|
+** direct access to string constants within the DLL. ^The
|
|
|
+** sqlite3_libversion_number() function returns an integer equal to
|
|
|
+** [SQLITE_VERSION_NUMBER]. ^(The sqlite3_sourceid() function returns
|
|
|
+** a pointer to a string constant whose value is the same as the
|
|
|
+** [SQLITE_SOURCE_ID] C preprocessor macro. Except if SQLite is built
|
|
|
+** using an edited copy of [the amalgamation], then the last four characters
|
|
|
+** of the hash might be different from [SQLITE_SOURCE_ID].)^
|
|
|
+**
|
|
|
+** See also: [sqlite_version()] and [sqlite_source_id()].
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_EXTERN const char sqlite3_version[];
|
|
|
+SQLITE_API const char *sqlite3_libversion(void);
|
|
|
+SQLITE_API const char *sqlite3_sourceid(void);
|
|
|
+SQLITE_API int sqlite3_libversion_number(void);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Run-Time Library Compilation Options Diagnostics
|
|
|
+**
|
|
|
+** ^The sqlite3_compileoption_used() function returns 0 or 1
|
|
|
+** indicating whether the specified option was defined at
|
|
|
+** compile time. ^The SQLITE_ prefix may be omitted from the
|
|
|
+** option name passed to sqlite3_compileoption_used().
|
|
|
+**
|
|
|
+** ^The sqlite3_compileoption_get() function allows iterating
|
|
|
+** over the list of options that were defined at compile time by
|
|
|
+** returning the N-th compile time option string. ^If N is out of range,
|
|
|
+** sqlite3_compileoption_get() returns a NULL pointer. ^The SQLITE_
|
|
|
+** prefix is omitted from any strings returned by
|
|
|
+** sqlite3_compileoption_get().
|
|
|
+**
|
|
|
+** ^Support for the diagnostic functions sqlite3_compileoption_used()
|
|
|
+** and sqlite3_compileoption_get() may be omitted by specifying the
|
|
|
+** [SQLITE_OMIT_COMPILEOPTION_DIAGS] option at compile time.
|
|
|
+**
|
|
|
+** See also: SQL functions [sqlite_compileoption_used()] and
|
|
|
+** [sqlite_compileoption_get()] and the [compile_options pragma].
|
|
|
+*/
|
|
|
+#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
|
|
|
+SQLITE_API int sqlite3_compileoption_used(const char *zOptName);
|
|
|
+SQLITE_API const char *sqlite3_compileoption_get(int N);
|
|
|
+#else
|
|
|
+# define sqlite3_compileoption_used(X) 0
|
|
|
+# define sqlite3_compileoption_get(X) ((void*)0)
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Test To See If The Library Is Threadsafe
|
|
|
+**
|
|
|
+** ^The sqlite3_threadsafe() function returns zero if and only if
|
|
|
+** SQLite was compiled with mutexing code omitted due to the
|
|
|
+** [SQLITE_THREADSAFE] compile-time option being set to 0.
|
|
|
+**
|
|
|
+** SQLite can be compiled with or without mutexes. When
|
|
|
+** the [SQLITE_THREADSAFE] C preprocessor macro is 1 or 2, mutexes
|
|
|
+** are enabled and SQLite is threadsafe. When the
|
|
|
+** [SQLITE_THREADSAFE] macro is 0,
|
|
|
+** the mutexes are omitted. Without the mutexes, it is not safe
|
|
|
+** to use SQLite concurrently from more than one thread.
|
|
|
+**
|
|
|
+** Enabling mutexes incurs a measurable performance penalty.
|
|
|
+** So if speed is of utmost importance, it makes sense to disable
|
|
|
+** the mutexes. But for maximum safety, mutexes should be enabled.
|
|
|
+** ^The default behavior is for mutexes to be enabled.
|
|
|
+**
|
|
|
+** This interface can be used by an application to make sure that the
|
|
|
+** version of SQLite that it is linking against was compiled with
|
|
|
+** the desired setting of the [SQLITE_THREADSAFE] macro.
|
|
|
+**
|
|
|
+** This interface only reports on the compile-time mutex setting
|
|
|
+** of the [SQLITE_THREADSAFE] flag. If SQLite is compiled with
|
|
|
+** SQLITE_THREADSAFE=1 or =2 then mutexes are enabled by default but
|
|
|
+** can be fully or partially disabled using a call to [sqlite3_config()]
|
|
|
+** with the verbs [SQLITE_CONFIG_SINGLETHREAD], [SQLITE_CONFIG_MULTITHREAD],
|
|
|
+** or [SQLITE_CONFIG_SERIALIZED]. ^(The return value of the
|
|
|
+** sqlite3_threadsafe() function shows only the compile-time setting of
|
|
|
+** thread safety, not any run-time changes to that setting made by
|
|
|
+** sqlite3_config(). In other words, the return value from sqlite3_threadsafe()
|
|
|
+** is unchanged by calls to sqlite3_config().)^
|
|
|
+**
|
|
|
+** See the [threading mode] documentation for additional information.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_threadsafe(void);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Database Connection Handle
|
|
|
+** KEYWORDS: {database connection} {database connections}
|
|
|
+**
|
|
|
+** Each open SQLite database is represented by a pointer to an instance of
|
|
|
+** the opaque structure named "sqlite3". It is useful to think of an sqlite3
|
|
|
+** pointer as an object. The [sqlite3_open()], [sqlite3_open16()], and
|
|
|
+** [sqlite3_open_v2()] interfaces are its constructors, and [sqlite3_close()]
|
|
|
+** and [sqlite3_close_v2()] are its destructors. There are many other
|
|
|
+** interfaces (such as
|
|
|
+** [sqlite3_prepare_v2()], [sqlite3_create_function()], and
|
|
|
+** [sqlite3_busy_timeout()] to name but three) that are methods on an
|
|
|
+** sqlite3 object.
|
|
|
+*/
|
|
|
+typedef struct sqlite3 sqlite3;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: 64-Bit Integer Types
|
|
|
+** KEYWORDS: sqlite_int64 sqlite_uint64
|
|
|
+**
|
|
|
+** Because there is no cross-platform way to specify 64-bit integer types
|
|
|
+** SQLite includes typedefs for 64-bit signed and unsigned integers.
|
|
|
+**
|
|
|
+** The sqlite3_int64 and sqlite3_uint64 are the preferred type definitions.
|
|
|
+** The sqlite_int64 and sqlite_uint64 types are supported for backwards
|
|
|
+** compatibility only.
|
|
|
+**
|
|
|
+** ^The sqlite3_int64 and sqlite_int64 types can store integer values
|
|
|
+** between -9223372036854775808 and +9223372036854775807 inclusive. ^The
|
|
|
+** sqlite3_uint64 and sqlite_uint64 types can store integer values
|
|
|
+** between 0 and +18446744073709551615 inclusive.
|
|
|
+*/
|
|
|
+#ifdef SQLITE_INT64_TYPE
|
|
|
+ typedef SQLITE_INT64_TYPE sqlite_int64;
|
|
|
+# ifdef SQLITE_UINT64_TYPE
|
|
|
+ typedef SQLITE_UINT64_TYPE sqlite_uint64;
|
|
|
+# else
|
|
|
+ typedef unsigned SQLITE_INT64_TYPE sqlite_uint64;
|
|
|
+# endif
|
|
|
+#elif defined(_MSC_VER) || defined(__BORLANDC__)
|
|
|
+ typedef __int64 sqlite_int64;
|
|
|
+ typedef unsigned __int64 sqlite_uint64;
|
|
|
+#else
|
|
|
+ typedef long long int sqlite_int64;
|
|
|
+ typedef unsigned long long int sqlite_uint64;
|
|
|
+#endif
|
|
|
+typedef sqlite_int64 sqlite3_int64;
|
|
|
+typedef sqlite_uint64 sqlite3_uint64;
|
|
|
+
|
|
|
+/*
|
|
|
+** If compiling for a processor that lacks floating point support,
|
|
|
+** substitute integer for floating-point.
|
|
|
+*/
|
|
|
+#ifdef SQLITE_OMIT_FLOATING_POINT
|
|
|
+# define double sqlite3_int64
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Closing A Database Connection
|
|
|
+** DESTRUCTOR: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_close() and sqlite3_close_v2() routines are destructors
|
|
|
+** for the [sqlite3] object.
|
|
|
+** ^Calls to sqlite3_close() and sqlite3_close_v2() return [SQLITE_OK] if
|
|
|
+** the [sqlite3] object is successfully destroyed and all associated
|
|
|
+** resources are deallocated.
|
|
|
+**
|
|
|
+** Ideally, applications should [sqlite3_finalize | finalize] all
|
|
|
+** [prepared statements], [sqlite3_blob_close | close] all [BLOB handles], and
|
|
|
+** [sqlite3_backup_finish | finish] all [sqlite3_backup] objects associated
|
|
|
+** with the [sqlite3] object prior to attempting to close the object.
|
|
|
+** ^If the database connection is associated with unfinalized prepared
|
|
|
+** statements, BLOB handlers, and/or unfinished sqlite3_backup objects then
|
|
|
+** sqlite3_close() will leave the database connection open and return
|
|
|
+** [SQLITE_BUSY]. ^If sqlite3_close_v2() is called with unfinalized prepared
|
|
|
+** statements, unclosed BLOB handlers, and/or unfinished sqlite3_backups,
|
|
|
+** it returns [SQLITE_OK] regardless, but instead of deallocating the database
|
|
|
+** connection immediately, it marks the database connection as an unusable
|
|
|
+** "zombie" and makes arrangements to automatically deallocate the database
|
|
|
+** connection after all prepared statements are finalized, all BLOB handles
|
|
|
+** are closed, and all backups have finished. The sqlite3_close_v2() interface
|
|
|
+** is intended for use with host languages that are garbage collected, and
|
|
|
+** where the order in which destructors are called is arbitrary.
|
|
|
+**
|
|
|
+** ^If an [sqlite3] object is destroyed while a transaction is open,
|
|
|
+** the transaction is automatically rolled back.
|
|
|
+**
|
|
|
+** The C parameter to [sqlite3_close(C)] and [sqlite3_close_v2(C)]
|
|
|
+** must be either a NULL
|
|
|
+** pointer or an [sqlite3] object pointer obtained
|
|
|
+** from [sqlite3_open()], [sqlite3_open16()], or
|
|
|
+** [sqlite3_open_v2()], and not previously closed.
|
|
|
+** ^Calling sqlite3_close() or sqlite3_close_v2() with a NULL pointer
|
|
|
+** argument is a harmless no-op.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_close(sqlite3*);
|
|
|
+SQLITE_API int sqlite3_close_v2(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** The type for a callback function.
|
|
|
+** This is legacy and deprecated. It is included for historical
|
|
|
+** compatibility and is not documented.
|
|
|
+*/
|
|
|
+typedef int (*sqlite3_callback)(void*,int,char**, char**);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: One-Step Query Execution Interface
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** The sqlite3_exec() interface is a convenience wrapper around
|
|
|
+** [sqlite3_prepare_v2()], [sqlite3_step()], and [sqlite3_finalize()],
|
|
|
+** that allows an application to run multiple statements of SQL
|
|
|
+** without having to use a lot of C code.
|
|
|
+**
|
|
|
+** ^The sqlite3_exec() interface runs zero or more UTF-8 encoded,
|
|
|
+** semicolon-separate SQL statements passed into its 2nd argument,
|
|
|
+** in the context of the [database connection] passed in as its 1st
|
|
|
+** argument. ^If the callback function of the 3rd argument to
|
|
|
+** sqlite3_exec() is not NULL, then it is invoked for each result row
|
|
|
+** coming out of the evaluated SQL statements. ^The 4th argument to
|
|
|
+** sqlite3_exec() is relayed through to the 1st argument of each
|
|
|
+** callback invocation. ^If the callback pointer to sqlite3_exec()
|
|
|
+** is NULL, then no callback is ever invoked and result rows are
|
|
|
+** ignored.
|
|
|
+**
|
|
|
+** ^If an error occurs while evaluating the SQL statements passed into
|
|
|
+** sqlite3_exec(), then execution of the current statement stops and
|
|
|
+** subsequent statements are skipped. ^If the 5th parameter to sqlite3_exec()
|
|
|
+** is not NULL then any error message is written into memory obtained
|
|
|
+** from [sqlite3_malloc()] and passed back through the 5th parameter.
|
|
|
+** To avoid memory leaks, the application should invoke [sqlite3_free()]
|
|
|
+** on error message strings returned through the 5th parameter of
|
|
|
+** sqlite3_exec() after the error message string is no longer needed.
|
|
|
+** ^If the 5th parameter to sqlite3_exec() is not NULL and no errors
|
|
|
+** occur, then sqlite3_exec() sets the pointer in its 5th parameter to
|
|
|
+** NULL before returning.
|
|
|
+**
|
|
|
+** ^If an sqlite3_exec() callback returns non-zero, the sqlite3_exec()
|
|
|
+** routine returns SQLITE_ABORT without invoking the callback again and
|
|
|
+** without running any subsequent SQL statements.
|
|
|
+**
|
|
|
+** ^The 2nd argument to the sqlite3_exec() callback function is the
|
|
|
+** number of columns in the result. ^The 3rd argument to the sqlite3_exec()
|
|
|
+** callback is an array of pointers to strings obtained as if from
|
|
|
+** [sqlite3_column_text()], one for each column. ^If an element of a
|
|
|
+** result row is NULL then the corresponding string pointer for the
|
|
|
+** sqlite3_exec() callback is a NULL pointer. ^The 4th argument to the
|
|
|
+** sqlite3_exec() callback is an array of pointers to strings where each
|
|
|
+** entry represents the name of corresponding result column as obtained
|
|
|
+** from [sqlite3_column_name()].
|
|
|
+**
|
|
|
+** ^If the 2nd parameter to sqlite3_exec() is a NULL pointer, a pointer
|
|
|
+** to an empty string, or a pointer that contains only whitespace and/or
|
|
|
+** SQL comments, then no SQL statements are evaluated and the database
|
|
|
+** is not changed.
|
|
|
+**
|
|
|
+** Restrictions:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> The application must ensure that the 1st parameter to sqlite3_exec()
|
|
|
+** is a valid and open [database connection].
|
|
|
+** <li> The application must not close the [database connection] specified by
|
|
|
+** the 1st parameter to sqlite3_exec() while sqlite3_exec() is running.
|
|
|
+** <li> The application must not modify the SQL statement text passed into
|
|
|
+** the 2nd parameter of sqlite3_exec() while sqlite3_exec() is running.
|
|
|
+** </ul>
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_exec(
|
|
|
+ sqlite3*, /* An open database */
|
|
|
+ const char *sql, /* SQL to be evaluated */
|
|
|
+ int (*callback)(void*,int,char**,char**), /* Callback function */
|
|
|
+ void *, /* 1st argument to callback */
|
|
|
+ char **errmsg /* Error msg written here */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Result Codes
|
|
|
+** KEYWORDS: {result code definitions}
|
|
|
+**
|
|
|
+** Many SQLite functions return an integer result code from the set shown
|
|
|
+** here in order to indicate success or failure.
|
|
|
+**
|
|
|
+** New error codes may be added in future versions of SQLite.
|
|
|
+**
|
|
|
+** See also: [extended result code definitions]
|
|
|
+*/
|
|
|
+#define SQLITE_OK 0 /* Successful result */
|
|
|
+/* beginning-of-error-codes */
|
|
|
+#define SQLITE_ERROR 1 /* Generic error */
|
|
|
+#define SQLITE_INTERNAL 2 /* Internal logic error in SQLite */
|
|
|
+#define SQLITE_PERM 3 /* Access permission denied */
|
|
|
+#define SQLITE_ABORT 4 /* Callback routine requested an abort */
|
|
|
+#define SQLITE_BUSY 5 /* The database file is locked */
|
|
|
+#define SQLITE_LOCKED 6 /* A table in the database is locked */
|
|
|
+#define SQLITE_NOMEM 7 /* A malloc() failed */
|
|
|
+#define SQLITE_READONLY 8 /* Attempt to write a readonly database */
|
|
|
+#define SQLITE_INTERRUPT 9 /* Operation terminated by sqlite3_interrupt()*/
|
|
|
+#define SQLITE_IOERR 10 /* Some kind of disk I/O error occurred */
|
|
|
+#define SQLITE_CORRUPT 11 /* The database disk image is malformed */
|
|
|
+#define SQLITE_NOTFOUND 12 /* Unknown opcode in sqlite3_file_control() */
|
|
|
+#define SQLITE_FULL 13 /* Insertion failed because database is full */
|
|
|
+#define SQLITE_CANTOPEN 14 /* Unable to open the database file */
|
|
|
+#define SQLITE_PROTOCOL 15 /* Database lock protocol error */
|
|
|
+#define SQLITE_EMPTY 16 /* Internal use only */
|
|
|
+#define SQLITE_SCHEMA 17 /* The database schema changed */
|
|
|
+#define SQLITE_TOOBIG 18 /* String or BLOB exceeds size limit */
|
|
|
+#define SQLITE_CONSTRAINT 19 /* Abort due to constraint violation */
|
|
|
+#define SQLITE_MISMATCH 20 /* Data type mismatch */
|
|
|
+#define SQLITE_MISUSE 21 /* Library used incorrectly */
|
|
|
+#define SQLITE_NOLFS 22 /* Uses OS features not supported on host */
|
|
|
+#define SQLITE_AUTH 23 /* Authorization denied */
|
|
|
+#define SQLITE_FORMAT 24 /* Not used */
|
|
|
+#define SQLITE_RANGE 25 /* 2nd parameter to sqlite3_bind out of range */
|
|
|
+#define SQLITE_NOTADB 26 /* File opened that is not a database file */
|
|
|
+#define SQLITE_NOTICE 27 /* Notifications from sqlite3_log() */
|
|
|
+#define SQLITE_WARNING 28 /* Warnings from sqlite3_log() */
|
|
|
+#define SQLITE_ROW 100 /* sqlite3_step() has another row ready */
|
|
|
+#define SQLITE_DONE 101 /* sqlite3_step() has finished executing */
|
|
|
+/* end-of-error-codes */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Extended Result Codes
|
|
|
+** KEYWORDS: {extended result code definitions}
|
|
|
+**
|
|
|
+** In its default configuration, SQLite API routines return one of 30 integer
|
|
|
+** [result codes]. However, experience has shown that many of
|
|
|
+** these result codes are too coarse-grained. They do not provide as
|
|
|
+** much information about problems as programmers might like. In an effort to
|
|
|
+** address this, newer versions of SQLite (version 3.3.8 [dateof:3.3.8]
|
|
|
+** and later) include
|
|
|
+** support for additional result codes that provide more detailed information
|
|
|
+** about errors. These [extended result codes] are enabled or disabled
|
|
|
+** on a per database connection basis using the
|
|
|
+** [sqlite3_extended_result_codes()] API. Or, the extended code for
|
|
|
+** the most recent error can be obtained using
|
|
|
+** [sqlite3_extended_errcode()].
|
|
|
+*/
|
|
|
+#define SQLITE_ERROR_MISSING_COLLSEQ (SQLITE_ERROR | (1<<8))
|
|
|
+#define SQLITE_ERROR_RETRY (SQLITE_ERROR | (2<<8))
|
|
|
+#define SQLITE_ERROR_SNAPSHOT (SQLITE_ERROR | (3<<8))
|
|
|
+#define SQLITE_IOERR_READ (SQLITE_IOERR | (1<<8))
|
|
|
+#define SQLITE_IOERR_SHORT_READ (SQLITE_IOERR | (2<<8))
|
|
|
+#define SQLITE_IOERR_WRITE (SQLITE_IOERR | (3<<8))
|
|
|
+#define SQLITE_IOERR_FSYNC (SQLITE_IOERR | (4<<8))
|
|
|
+#define SQLITE_IOERR_DIR_FSYNC (SQLITE_IOERR | (5<<8))
|
|
|
+#define SQLITE_IOERR_TRUNCATE (SQLITE_IOERR | (6<<8))
|
|
|
+#define SQLITE_IOERR_FSTAT (SQLITE_IOERR | (7<<8))
|
|
|
+#define SQLITE_IOERR_UNLOCK (SQLITE_IOERR | (8<<8))
|
|
|
+#define SQLITE_IOERR_RDLOCK (SQLITE_IOERR | (9<<8))
|
|
|
+#define SQLITE_IOERR_DELETE (SQLITE_IOERR | (10<<8))
|
|
|
+#define SQLITE_IOERR_BLOCKED (SQLITE_IOERR | (11<<8))
|
|
|
+#define SQLITE_IOERR_NOMEM (SQLITE_IOERR | (12<<8))
|
|
|
+#define SQLITE_IOERR_ACCESS (SQLITE_IOERR | (13<<8))
|
|
|
+#define SQLITE_IOERR_CHECKRESERVEDLOCK (SQLITE_IOERR | (14<<8))
|
|
|
+#define SQLITE_IOERR_LOCK (SQLITE_IOERR | (15<<8))
|
|
|
+#define SQLITE_IOERR_CLOSE (SQLITE_IOERR | (16<<8))
|
|
|
+#define SQLITE_IOERR_DIR_CLOSE (SQLITE_IOERR | (17<<8))
|
|
|
+#define SQLITE_IOERR_SHMOPEN (SQLITE_IOERR | (18<<8))
|
|
|
+#define SQLITE_IOERR_SHMSIZE (SQLITE_IOERR | (19<<8))
|
|
|
+#define SQLITE_IOERR_SHMLOCK (SQLITE_IOERR | (20<<8))
|
|
|
+#define SQLITE_IOERR_SHMMAP (SQLITE_IOERR | (21<<8))
|
|
|
+#define SQLITE_IOERR_SEEK (SQLITE_IOERR | (22<<8))
|
|
|
+#define SQLITE_IOERR_DELETE_NOENT (SQLITE_IOERR | (23<<8))
|
|
|
+#define SQLITE_IOERR_MMAP (SQLITE_IOERR | (24<<8))
|
|
|
+#define SQLITE_IOERR_GETTEMPPATH (SQLITE_IOERR | (25<<8))
|
|
|
+#define SQLITE_IOERR_CONVPATH (SQLITE_IOERR | (26<<8))
|
|
|
+#define SQLITE_IOERR_VNODE (SQLITE_IOERR | (27<<8))
|
|
|
+#define SQLITE_IOERR_AUTH (SQLITE_IOERR | (28<<8))
|
|
|
+#define SQLITE_IOERR_BEGIN_ATOMIC (SQLITE_IOERR | (29<<8))
|
|
|
+#define SQLITE_IOERR_COMMIT_ATOMIC (SQLITE_IOERR | (30<<8))
|
|
|
+#define SQLITE_IOERR_ROLLBACK_ATOMIC (SQLITE_IOERR | (31<<8))
|
|
|
+#define SQLITE_IOERR_DATA (SQLITE_IOERR | (32<<8))
|
|
|
+#define SQLITE_IOERR_CORRUPTFS (SQLITE_IOERR | (33<<8))
|
|
|
+#define SQLITE_LOCKED_SHAREDCACHE (SQLITE_LOCKED | (1<<8))
|
|
|
+#define SQLITE_LOCKED_VTAB (SQLITE_LOCKED | (2<<8))
|
|
|
+#define SQLITE_BUSY_RECOVERY (SQLITE_BUSY | (1<<8))
|
|
|
+#define SQLITE_BUSY_SNAPSHOT (SQLITE_BUSY | (2<<8))
|
|
|
+#define SQLITE_BUSY_TIMEOUT (SQLITE_BUSY | (3<<8))
|
|
|
+#define SQLITE_CANTOPEN_NOTEMPDIR (SQLITE_CANTOPEN | (1<<8))
|
|
|
+#define SQLITE_CANTOPEN_ISDIR (SQLITE_CANTOPEN | (2<<8))
|
|
|
+#define SQLITE_CANTOPEN_FULLPATH (SQLITE_CANTOPEN | (3<<8))
|
|
|
+#define SQLITE_CANTOPEN_CONVPATH (SQLITE_CANTOPEN | (4<<8))
|
|
|
+#define SQLITE_CANTOPEN_DIRTYWAL (SQLITE_CANTOPEN | (5<<8)) /* Not Used */
|
|
|
+#define SQLITE_CANTOPEN_SYMLINK (SQLITE_CANTOPEN | (6<<8))
|
|
|
+#define SQLITE_CORRUPT_VTAB (SQLITE_CORRUPT | (1<<8))
|
|
|
+#define SQLITE_CORRUPT_SEQUENCE (SQLITE_CORRUPT | (2<<8))
|
|
|
+#define SQLITE_CORRUPT_INDEX (SQLITE_CORRUPT | (3<<8))
|
|
|
+#define SQLITE_READONLY_RECOVERY (SQLITE_READONLY | (1<<8))
|
|
|
+#define SQLITE_READONLY_CANTLOCK (SQLITE_READONLY | (2<<8))
|
|
|
+#define SQLITE_READONLY_ROLLBACK (SQLITE_READONLY | (3<<8))
|
|
|
+#define SQLITE_READONLY_DBMOVED (SQLITE_READONLY | (4<<8))
|
|
|
+#define SQLITE_READONLY_CANTINIT (SQLITE_READONLY | (5<<8))
|
|
|
+#define SQLITE_READONLY_DIRECTORY (SQLITE_READONLY | (6<<8))
|
|
|
+#define SQLITE_ABORT_ROLLBACK (SQLITE_ABORT | (2<<8))
|
|
|
+#define SQLITE_CONSTRAINT_CHECK (SQLITE_CONSTRAINT | (1<<8))
|
|
|
+#define SQLITE_CONSTRAINT_COMMITHOOK (SQLITE_CONSTRAINT | (2<<8))
|
|
|
+#define SQLITE_CONSTRAINT_FOREIGNKEY (SQLITE_CONSTRAINT | (3<<8))
|
|
|
+#define SQLITE_CONSTRAINT_FUNCTION (SQLITE_CONSTRAINT | (4<<8))
|
|
|
+#define SQLITE_CONSTRAINT_NOTNULL (SQLITE_CONSTRAINT | (5<<8))
|
|
|
+#define SQLITE_CONSTRAINT_PRIMARYKEY (SQLITE_CONSTRAINT | (6<<8))
|
|
|
+#define SQLITE_CONSTRAINT_TRIGGER (SQLITE_CONSTRAINT | (7<<8))
|
|
|
+#define SQLITE_CONSTRAINT_UNIQUE (SQLITE_CONSTRAINT | (8<<8))
|
|
|
+#define SQLITE_CONSTRAINT_VTAB (SQLITE_CONSTRAINT | (9<<8))
|
|
|
+#define SQLITE_CONSTRAINT_ROWID (SQLITE_CONSTRAINT |(10<<8))
|
|
|
+#define SQLITE_CONSTRAINT_PINNED (SQLITE_CONSTRAINT |(11<<8))
|
|
|
+#define SQLITE_CONSTRAINT_DATATYPE (SQLITE_CONSTRAINT |(12<<8))
|
|
|
+#define SQLITE_NOTICE_RECOVER_WAL (SQLITE_NOTICE | (1<<8))
|
|
|
+#define SQLITE_NOTICE_RECOVER_ROLLBACK (SQLITE_NOTICE | (2<<8))
|
|
|
+#define SQLITE_WARNING_AUTOINDEX (SQLITE_WARNING | (1<<8))
|
|
|
+#define SQLITE_AUTH_USER (SQLITE_AUTH | (1<<8))
|
|
|
+#define SQLITE_OK_LOAD_PERMANENTLY (SQLITE_OK | (1<<8))
|
|
|
+#define SQLITE_OK_SYMLINK (SQLITE_OK | (2<<8)) /* internal use only */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Flags For File Open Operations
|
|
|
+**
|
|
|
+** These bit values are intended for use in the
|
|
|
+** 3rd parameter to the [sqlite3_open_v2()] interface and
|
|
|
+** in the 4th parameter to the [sqlite3_vfs.xOpen] method.
|
|
|
+**
|
|
|
+** Only those flags marked as "Ok for sqlite3_open_v2()" may be
|
|
|
+** used as the third argument to the [sqlite3_open_v2()] interface.
|
|
|
+** The other flags have historically been ignored by sqlite3_open_v2(),
|
|
|
+** though future versions of SQLite might change so that an error is
|
|
|
+** raised if any of the disallowed bits are passed into sqlite3_open_v2().
|
|
|
+** Applications should not depend on the historical behavior.
|
|
|
+**
|
|
|
+** Note in particular that passing the SQLITE_OPEN_EXCLUSIVE flag into
|
|
|
+** [sqlite3_open_v2()] does *not* cause the underlying database file
|
|
|
+** to be opened using O_EXCL. Passing SQLITE_OPEN_EXCLUSIVE into
|
|
|
+** [sqlite3_open_v2()] has historically be a no-op and might become an
|
|
|
+** error in future versions of SQLite.
|
|
|
+*/
|
|
|
+#define SQLITE_OPEN_READONLY 0x00000001 /* Ok for sqlite3_open_v2() */
|
|
|
+#define SQLITE_OPEN_READWRITE 0x00000002 /* Ok for sqlite3_open_v2() */
|
|
|
+#define SQLITE_OPEN_CREATE 0x00000004 /* Ok for sqlite3_open_v2() */
|
|
|
+#define SQLITE_OPEN_DELETEONCLOSE 0x00000008 /* VFS only */
|
|
|
+#define SQLITE_OPEN_EXCLUSIVE 0x00000010 /* VFS only */
|
|
|
+#define SQLITE_OPEN_AUTOPROXY 0x00000020 /* VFS only */
|
|
|
+#define SQLITE_OPEN_URI 0x00000040 /* Ok for sqlite3_open_v2() */
|
|
|
+#define SQLITE_OPEN_MEMORY 0x00000080 /* Ok for sqlite3_open_v2() */
|
|
|
+#define SQLITE_OPEN_MAIN_DB 0x00000100 /* VFS only */
|
|
|
+#define SQLITE_OPEN_TEMP_DB 0x00000200 /* VFS only */
|
|
|
+#define SQLITE_OPEN_TRANSIENT_DB 0x00000400 /* VFS only */
|
|
|
+#define SQLITE_OPEN_MAIN_JOURNAL 0x00000800 /* VFS only */
|
|
|
+#define SQLITE_OPEN_TEMP_JOURNAL 0x00001000 /* VFS only */
|
|
|
+#define SQLITE_OPEN_SUBJOURNAL 0x00002000 /* VFS only */
|
|
|
+#define SQLITE_OPEN_SUPER_JOURNAL 0x00004000 /* VFS only */
|
|
|
+#define SQLITE_OPEN_NOMUTEX 0x00008000 /* Ok for sqlite3_open_v2() */
|
|
|
+#define SQLITE_OPEN_FULLMUTEX 0x00010000 /* Ok for sqlite3_open_v2() */
|
|
|
+#define SQLITE_OPEN_SHAREDCACHE 0x00020000 /* Ok for sqlite3_open_v2() */
|
|
|
+#define SQLITE_OPEN_PRIVATECACHE 0x00040000 /* Ok for sqlite3_open_v2() */
|
|
|
+#define SQLITE_OPEN_WAL 0x00080000 /* VFS only */
|
|
|
+#define SQLITE_OPEN_NOFOLLOW 0x01000000 /* Ok for sqlite3_open_v2() */
|
|
|
+#define SQLITE_OPEN_EXRESCODE 0x02000000 /* Extended result codes */
|
|
|
+
|
|
|
+/* Reserved: 0x00F00000 */
|
|
|
+/* Legacy compatibility: */
|
|
|
+#define SQLITE_OPEN_MASTER_JOURNAL 0x00004000 /* VFS only */
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Device Characteristics
|
|
|
+**
|
|
|
+** The xDeviceCharacteristics method of the [sqlite3_io_methods]
|
|
|
+** object returns an integer which is a vector of these
|
|
|
+** bit values expressing I/O characteristics of the mass storage
|
|
|
+** device that holds the file that the [sqlite3_io_methods]
|
|
|
+** refers to.
|
|
|
+**
|
|
|
+** The SQLITE_IOCAP_ATOMIC property means that all writes of
|
|
|
+** any size are atomic. The SQLITE_IOCAP_ATOMICnnn values
|
|
|
+** mean that writes of blocks that are nnn bytes in size and
|
|
|
+** are aligned to an address which is an integer multiple of
|
|
|
+** nnn are atomic. The SQLITE_IOCAP_SAFE_APPEND value means
|
|
|
+** that when data is appended to a file, the data is appended
|
|
|
+** first then the size of the file is extended, never the other
|
|
|
+** way around. The SQLITE_IOCAP_SEQUENTIAL property means that
|
|
|
+** information is written to disk in the same order as calls
|
|
|
+** to xWrite(). The SQLITE_IOCAP_POWERSAFE_OVERWRITE property means that
|
|
|
+** after reboot following a crash or power loss, the only bytes in a
|
|
|
+** file that were written at the application level might have changed
|
|
|
+** and that adjacent bytes, even bytes within the same sector are
|
|
|
+** guaranteed to be unchanged. The SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN
|
|
|
+** flag indicates that a file cannot be deleted when open. The
|
|
|
+** SQLITE_IOCAP_IMMUTABLE flag indicates that the file is on
|
|
|
+** read-only media and cannot be changed even by processes with
|
|
|
+** elevated privileges.
|
|
|
+**
|
|
|
+** The SQLITE_IOCAP_BATCH_ATOMIC property means that the underlying
|
|
|
+** filesystem supports doing multiple write operations atomically when those
|
|
|
+** write operations are bracketed by [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] and
|
|
|
+** [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE].
|
|
|
+*/
|
|
|
+#define SQLITE_IOCAP_ATOMIC 0x00000001
|
|
|
+#define SQLITE_IOCAP_ATOMIC512 0x00000002
|
|
|
+#define SQLITE_IOCAP_ATOMIC1K 0x00000004
|
|
|
+#define SQLITE_IOCAP_ATOMIC2K 0x00000008
|
|
|
+#define SQLITE_IOCAP_ATOMIC4K 0x00000010
|
|
|
+#define SQLITE_IOCAP_ATOMIC8K 0x00000020
|
|
|
+#define SQLITE_IOCAP_ATOMIC16K 0x00000040
|
|
|
+#define SQLITE_IOCAP_ATOMIC32K 0x00000080
|
|
|
+#define SQLITE_IOCAP_ATOMIC64K 0x00000100
|
|
|
+#define SQLITE_IOCAP_SAFE_APPEND 0x00000200
|
|
|
+#define SQLITE_IOCAP_SEQUENTIAL 0x00000400
|
|
|
+#define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN 0x00000800
|
|
|
+#define SQLITE_IOCAP_POWERSAFE_OVERWRITE 0x00001000
|
|
|
+#define SQLITE_IOCAP_IMMUTABLE 0x00002000
|
|
|
+#define SQLITE_IOCAP_BATCH_ATOMIC 0x00004000
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: File Locking Levels
|
|
|
+**
|
|
|
+** SQLite uses one of these integer values as the second
|
|
|
+** argument to calls it makes to the xLock() and xUnlock() methods
|
|
|
+** of an [sqlite3_io_methods] object.
|
|
|
+*/
|
|
|
+#define SQLITE_LOCK_NONE 0
|
|
|
+#define SQLITE_LOCK_SHARED 1
|
|
|
+#define SQLITE_LOCK_RESERVED 2
|
|
|
+#define SQLITE_LOCK_PENDING 3
|
|
|
+#define SQLITE_LOCK_EXCLUSIVE 4
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Synchronization Type Flags
|
|
|
+**
|
|
|
+** When SQLite invokes the xSync() method of an
|
|
|
+** [sqlite3_io_methods] object it uses a combination of
|
|
|
+** these integer values as the second argument.
|
|
|
+**
|
|
|
+** When the SQLITE_SYNC_DATAONLY flag is used, it means that the
|
|
|
+** sync operation only needs to flush data to mass storage. Inode
|
|
|
+** information need not be flushed. If the lower four bits of the flag
|
|
|
+** equal SQLITE_SYNC_NORMAL, that means to use normal fsync() semantics.
|
|
|
+** If the lower four bits equal SQLITE_SYNC_FULL, that means
|
|
|
+** to use Mac OS X style fullsync instead of fsync().
|
|
|
+**
|
|
|
+** Do not confuse the SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL flags
|
|
|
+** with the [PRAGMA synchronous]=NORMAL and [PRAGMA synchronous]=FULL
|
|
|
+** settings. The [synchronous pragma] determines when calls to the
|
|
|
+** xSync VFS method occur and applies uniformly across all platforms.
|
|
|
+** The SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL flags determine how
|
|
|
+** energetic or rigorous or forceful the sync operations are and
|
|
|
+** only make a difference on Mac OSX for the default SQLite code.
|
|
|
+** (Third-party VFS implementations might also make the distinction
|
|
|
+** between SQLITE_SYNC_NORMAL and SQLITE_SYNC_FULL, but among the
|
|
|
+** operating systems natively supported by SQLite, only Mac OSX
|
|
|
+** cares about the difference.)
|
|
|
+*/
|
|
|
+#define SQLITE_SYNC_NORMAL 0x00002
|
|
|
+#define SQLITE_SYNC_FULL 0x00003
|
|
|
+#define SQLITE_SYNC_DATAONLY 0x00010
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: OS Interface Open File Handle
|
|
|
+**
|
|
|
+** An [sqlite3_file] object represents an open file in the
|
|
|
+** [sqlite3_vfs | OS interface layer]. Individual OS interface
|
|
|
+** implementations will
|
|
|
+** want to subclass this object by appending additional fields
|
|
|
+** for their own use. The pMethods entry is a pointer to an
|
|
|
+** [sqlite3_io_methods] object that defines methods for performing
|
|
|
+** I/O operations on the open file.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_file sqlite3_file;
|
|
|
+struct sqlite3_file {
|
|
|
+ const struct sqlite3_io_methods *pMethods; /* Methods for an open file */
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: OS Interface File Virtual Methods Object
|
|
|
+**
|
|
|
+** Every file opened by the [sqlite3_vfs.xOpen] method populates an
|
|
|
+** [sqlite3_file] object (or, more commonly, a subclass of the
|
|
|
+** [sqlite3_file] object) with a pointer to an instance of this object.
|
|
|
+** This object defines the methods used to perform various operations
|
|
|
+** against the open file represented by the [sqlite3_file] object.
|
|
|
+**
|
|
|
+** If the [sqlite3_vfs.xOpen] method sets the sqlite3_file.pMethods element
|
|
|
+** to a non-NULL pointer, then the sqlite3_io_methods.xClose method
|
|
|
+** may be invoked even if the [sqlite3_vfs.xOpen] reported that it failed. The
|
|
|
+** only way to prevent a call to xClose following a failed [sqlite3_vfs.xOpen]
|
|
|
+** is for the [sqlite3_vfs.xOpen] to set the sqlite3_file.pMethods element
|
|
|
+** to NULL.
|
|
|
+**
|
|
|
+** The flags argument to xSync may be one of [SQLITE_SYNC_NORMAL] or
|
|
|
+** [SQLITE_SYNC_FULL]. The first choice is the normal fsync().
|
|
|
+** The second choice is a Mac OS X style fullsync. The [SQLITE_SYNC_DATAONLY]
|
|
|
+** flag may be ORed in to indicate that only the data of the file
|
|
|
+** and not its inode needs to be synced.
|
|
|
+**
|
|
|
+** The integer values to xLock() and xUnlock() are one of
|
|
|
+** <ul>
|
|
|
+** <li> [SQLITE_LOCK_NONE],
|
|
|
+** <li> [SQLITE_LOCK_SHARED],
|
|
|
+** <li> [SQLITE_LOCK_RESERVED],
|
|
|
+** <li> [SQLITE_LOCK_PENDING], or
|
|
|
+** <li> [SQLITE_LOCK_EXCLUSIVE].
|
|
|
+** </ul>
|
|
|
+** xLock() increases the lock. xUnlock() decreases the lock.
|
|
|
+** The xCheckReservedLock() method checks whether any database connection,
|
|
|
+** either in this process or in some other process, is holding a RESERVED,
|
|
|
+** PENDING, or EXCLUSIVE lock on the file. It returns true
|
|
|
+** if such a lock exists and false otherwise.
|
|
|
+**
|
|
|
+** The xFileControl() method is a generic interface that allows custom
|
|
|
+** VFS implementations to directly control an open file using the
|
|
|
+** [sqlite3_file_control()] interface. The second "op" argument is an
|
|
|
+** integer opcode. The third argument is a generic pointer intended to
|
|
|
+** point to a structure that may contain arguments or space in which to
|
|
|
+** write return values. Potential uses for xFileControl() might be
|
|
|
+** functions to enable blocking locks with timeouts, to change the
|
|
|
+** locking strategy (for example to use dot-file locks), to inquire
|
|
|
+** about the status of a lock, or to break stale locks. The SQLite
|
|
|
+** core reserves all opcodes less than 100 for its own use.
|
|
|
+** A [file control opcodes | list of opcodes] less than 100 is available.
|
|
|
+** Applications that define a custom xFileControl method should use opcodes
|
|
|
+** greater than 100 to avoid conflicts. VFS implementations should
|
|
|
+** return [SQLITE_NOTFOUND] for file control opcodes that they do not
|
|
|
+** recognize.
|
|
|
+**
|
|
|
+** The xSectorSize() method returns the sector size of the
|
|
|
+** device that underlies the file. The sector size is the
|
|
|
+** minimum write that can be performed without disturbing
|
|
|
+** other bytes in the file. The xDeviceCharacteristics()
|
|
|
+** method returns a bit vector describing behaviors of the
|
|
|
+** underlying device:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> [SQLITE_IOCAP_ATOMIC]
|
|
|
+** <li> [SQLITE_IOCAP_ATOMIC512]
|
|
|
+** <li> [SQLITE_IOCAP_ATOMIC1K]
|
|
|
+** <li> [SQLITE_IOCAP_ATOMIC2K]
|
|
|
+** <li> [SQLITE_IOCAP_ATOMIC4K]
|
|
|
+** <li> [SQLITE_IOCAP_ATOMIC8K]
|
|
|
+** <li> [SQLITE_IOCAP_ATOMIC16K]
|
|
|
+** <li> [SQLITE_IOCAP_ATOMIC32K]
|
|
|
+** <li> [SQLITE_IOCAP_ATOMIC64K]
|
|
|
+** <li> [SQLITE_IOCAP_SAFE_APPEND]
|
|
|
+** <li> [SQLITE_IOCAP_SEQUENTIAL]
|
|
|
+** <li> [SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN]
|
|
|
+** <li> [SQLITE_IOCAP_POWERSAFE_OVERWRITE]
|
|
|
+** <li> [SQLITE_IOCAP_IMMUTABLE]
|
|
|
+** <li> [SQLITE_IOCAP_BATCH_ATOMIC]
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** The SQLITE_IOCAP_ATOMIC property means that all writes of
|
|
|
+** any size are atomic. The SQLITE_IOCAP_ATOMICnnn values
|
|
|
+** mean that writes of blocks that are nnn bytes in size and
|
|
|
+** are aligned to an address which is an integer multiple of
|
|
|
+** nnn are atomic. The SQLITE_IOCAP_SAFE_APPEND value means
|
|
|
+** that when data is appended to a file, the data is appended
|
|
|
+** first then the size of the file is extended, never the other
|
|
|
+** way around. The SQLITE_IOCAP_SEQUENTIAL property means that
|
|
|
+** information is written to disk in the same order as calls
|
|
|
+** to xWrite().
|
|
|
+**
|
|
|
+** If xRead() returns SQLITE_IOERR_SHORT_READ it must also fill
|
|
|
+** in the unread portions of the buffer with zeros. A VFS that
|
|
|
+** fails to zero-fill short reads might seem to work. However,
|
|
|
+** failure to zero-fill short reads will eventually lead to
|
|
|
+** database corruption.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_io_methods sqlite3_io_methods;
|
|
|
+struct sqlite3_io_methods {
|
|
|
+ int iVersion;
|
|
|
+ int (*xClose)(sqlite3_file*);
|
|
|
+ int (*xRead)(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst);
|
|
|
+ int (*xWrite)(sqlite3_file*, const void*, int iAmt, sqlite3_int64 iOfst);
|
|
|
+ int (*xTruncate)(sqlite3_file*, sqlite3_int64 size);
|
|
|
+ int (*xSync)(sqlite3_file*, int flags);
|
|
|
+ int (*xFileSize)(sqlite3_file*, sqlite3_int64 *pSize);
|
|
|
+ int (*xLock)(sqlite3_file*, int);
|
|
|
+ int (*xUnlock)(sqlite3_file*, int);
|
|
|
+ int (*xCheckReservedLock)(sqlite3_file*, int *pResOut);
|
|
|
+ int (*xFileControl)(sqlite3_file*, int op, void *pArg);
|
|
|
+ int (*xSectorSize)(sqlite3_file*);
|
|
|
+ int (*xDeviceCharacteristics)(sqlite3_file*);
|
|
|
+ /* Methods above are valid for version 1 */
|
|
|
+ int (*xShmMap)(sqlite3_file*, int iPg, int pgsz, int, void volatile**);
|
|
|
+ int (*xShmLock)(sqlite3_file*, int offset, int n, int flags);
|
|
|
+ void (*xShmBarrier)(sqlite3_file*);
|
|
|
+ int (*xShmUnmap)(sqlite3_file*, int deleteFlag);
|
|
|
+ /* Methods above are valid for version 2 */
|
|
|
+ int (*xFetch)(sqlite3_file*, sqlite3_int64 iOfst, int iAmt, void **pp);
|
|
|
+ int (*xUnfetch)(sqlite3_file*, sqlite3_int64 iOfst, void *p);
|
|
|
+ /* Methods above are valid for version 3 */
|
|
|
+ /* Additional methods may be added in future releases */
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Standard File Control Opcodes
|
|
|
+** KEYWORDS: {file control opcodes} {file control opcode}
|
|
|
+**
|
|
|
+** These integer constants are opcodes for the xFileControl method
|
|
|
+** of the [sqlite3_io_methods] object and for the [sqlite3_file_control()]
|
|
|
+** interface.
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li>[[SQLITE_FCNTL_LOCKSTATE]]
|
|
|
+** The [SQLITE_FCNTL_LOCKSTATE] opcode is used for debugging. This
|
|
|
+** opcode causes the xFileControl method to write the current state of
|
|
|
+** the lock (one of [SQLITE_LOCK_NONE], [SQLITE_LOCK_SHARED],
|
|
|
+** [SQLITE_LOCK_RESERVED], [SQLITE_LOCK_PENDING], or [SQLITE_LOCK_EXCLUSIVE])
|
|
|
+** into an integer that the pArg argument points to. This capability
|
|
|
+** is used during testing and is only available when the SQLITE_TEST
|
|
|
+** compile-time option is used.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_SIZE_HINT]]
|
|
|
+** The [SQLITE_FCNTL_SIZE_HINT] opcode is used by SQLite to give the VFS
|
|
|
+** layer a hint of how large the database file will grow to be during the
|
|
|
+** current transaction. This hint is not guaranteed to be accurate but it
|
|
|
+** is often close. The underlying VFS might choose to preallocate database
|
|
|
+** file space based on this hint in order to help writes to the database
|
|
|
+** file run faster.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_SIZE_LIMIT]]
|
|
|
+** The [SQLITE_FCNTL_SIZE_LIMIT] opcode is used by in-memory VFS that
|
|
|
+** implements [sqlite3_deserialize()] to set an upper bound on the size
|
|
|
+** of the in-memory database. The argument is a pointer to a [sqlite3_int64].
|
|
|
+** If the integer pointed to is negative, then it is filled in with the
|
|
|
+** current limit. Otherwise the limit is set to the larger of the value
|
|
|
+** of the integer pointed to and the current database size. The integer
|
|
|
+** pointed to is set to the new limit.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_CHUNK_SIZE]]
|
|
|
+** The [SQLITE_FCNTL_CHUNK_SIZE] opcode is used to request that the VFS
|
|
|
+** extends and truncates the database file in chunks of a size specified
|
|
|
+** by the user. The fourth argument to [sqlite3_file_control()] should
|
|
|
+** point to an integer (type int) containing the new chunk-size to use
|
|
|
+** for the nominated database. Allocating database file space in large
|
|
|
+** chunks (say 1MB at a time), may reduce file-system fragmentation and
|
|
|
+** improve performance on some systems.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_FILE_POINTER]]
|
|
|
+** The [SQLITE_FCNTL_FILE_POINTER] opcode is used to obtain a pointer
|
|
|
+** to the [sqlite3_file] object associated with a particular database
|
|
|
+** connection. See also [SQLITE_FCNTL_JOURNAL_POINTER].
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_JOURNAL_POINTER]]
|
|
|
+** The [SQLITE_FCNTL_JOURNAL_POINTER] opcode is used to obtain a pointer
|
|
|
+** to the [sqlite3_file] object associated with the journal file (either
|
|
|
+** the [rollback journal] or the [write-ahead log]) for a particular database
|
|
|
+** connection. See also [SQLITE_FCNTL_FILE_POINTER].
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_SYNC_OMITTED]]
|
|
|
+** No longer in use.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_SYNC]]
|
|
|
+** The [SQLITE_FCNTL_SYNC] opcode is generated internally by SQLite and
|
|
|
+** sent to the VFS immediately before the xSync method is invoked on a
|
|
|
+** database file descriptor. Or, if the xSync method is not invoked
|
|
|
+** because the user has configured SQLite with
|
|
|
+** [PRAGMA synchronous | PRAGMA synchronous=OFF] it is invoked in place
|
|
|
+** of the xSync method. In most cases, the pointer argument passed with
|
|
|
+** this file-control is NULL. However, if the database file is being synced
|
|
|
+** as part of a multi-database commit, the argument points to a nul-terminated
|
|
|
+** string containing the transactions super-journal file name. VFSes that
|
|
|
+** do not need this signal should silently ignore this opcode. Applications
|
|
|
+** should not call [sqlite3_file_control()] with this opcode as doing so may
|
|
|
+** disrupt the operation of the specialized VFSes that do require it.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_COMMIT_PHASETWO]]
|
|
|
+** The [SQLITE_FCNTL_COMMIT_PHASETWO] opcode is generated internally by SQLite
|
|
|
+** and sent to the VFS after a transaction has been committed immediately
|
|
|
+** but before the database is unlocked. VFSes that do not need this signal
|
|
|
+** should silently ignore this opcode. Applications should not call
|
|
|
+** [sqlite3_file_control()] with this opcode as doing so may disrupt the
|
|
|
+** operation of the specialized VFSes that do require it.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_WIN32_AV_RETRY]]
|
|
|
+** ^The [SQLITE_FCNTL_WIN32_AV_RETRY] opcode is used to configure automatic
|
|
|
+** retry counts and intervals for certain disk I/O operations for the
|
|
|
+** windows [VFS] in order to provide robustness in the presence of
|
|
|
+** anti-virus programs. By default, the windows VFS will retry file read,
|
|
|
+** file write, and file delete operations up to 10 times, with a delay
|
|
|
+** of 25 milliseconds before the first retry and with the delay increasing
|
|
|
+** by an additional 25 milliseconds with each subsequent retry. This
|
|
|
+** opcode allows these two values (10 retries and 25 milliseconds of delay)
|
|
|
+** to be adjusted. The values are changed for all database connections
|
|
|
+** within the same process. The argument is a pointer to an array of two
|
|
|
+** integers where the first integer is the new retry count and the second
|
|
|
+** integer is the delay. If either integer is negative, then the setting
|
|
|
+** is not changed but instead the prior value of that setting is written
|
|
|
+** into the array entry, allowing the current retry settings to be
|
|
|
+** interrogated. The zDbName parameter is ignored.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_PERSIST_WAL]]
|
|
|
+** ^The [SQLITE_FCNTL_PERSIST_WAL] opcode is used to set or query the
|
|
|
+** persistent [WAL | Write Ahead Log] setting. By default, the auxiliary
|
|
|
+** write ahead log ([WAL file]) and shared memory
|
|
|
+** files used for transaction control
|
|
|
+** are automatically deleted when the latest connection to the database
|
|
|
+** closes. Setting persistent WAL mode causes those files to persist after
|
|
|
+** close. Persisting the files is useful when other processes that do not
|
|
|
+** have write permission on the directory containing the database file want
|
|
|
+** to read the database file, as the WAL and shared memory files must exist
|
|
|
+** in order for the database to be readable. The fourth parameter to
|
|
|
+** [sqlite3_file_control()] for this opcode should be a pointer to an integer.
|
|
|
+** That integer is 0 to disable persistent WAL mode or 1 to enable persistent
|
|
|
+** WAL mode. If the integer is -1, then it is overwritten with the current
|
|
|
+** WAL persistence setting.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_POWERSAFE_OVERWRITE]]
|
|
|
+** ^The [SQLITE_FCNTL_POWERSAFE_OVERWRITE] opcode is used to set or query the
|
|
|
+** persistent "powersafe-overwrite" or "PSOW" setting. The PSOW setting
|
|
|
+** determines the [SQLITE_IOCAP_POWERSAFE_OVERWRITE] bit of the
|
|
|
+** xDeviceCharacteristics methods. The fourth parameter to
|
|
|
+** [sqlite3_file_control()] for this opcode should be a pointer to an integer.
|
|
|
+** That integer is 0 to disable zero-damage mode or 1 to enable zero-damage
|
|
|
+** mode. If the integer is -1, then it is overwritten with the current
|
|
|
+** zero-damage mode setting.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_OVERWRITE]]
|
|
|
+** ^The [SQLITE_FCNTL_OVERWRITE] opcode is invoked by SQLite after opening
|
|
|
+** a write transaction to indicate that, unless it is rolled back for some
|
|
|
+** reason, the entire database file will be overwritten by the current
|
|
|
+** transaction. This is used by VACUUM operations.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_VFSNAME]]
|
|
|
+** ^The [SQLITE_FCNTL_VFSNAME] opcode can be used to obtain the names of
|
|
|
+** all [VFSes] in the VFS stack. The names are of all VFS shims and the
|
|
|
+** final bottom-level VFS are written into memory obtained from
|
|
|
+** [sqlite3_malloc()] and the result is stored in the char* variable
|
|
|
+** that the fourth parameter of [sqlite3_file_control()] points to.
|
|
|
+** The caller is responsible for freeing the memory when done. As with
|
|
|
+** all file-control actions, there is no guarantee that this will actually
|
|
|
+** do anything. Callers should initialize the char* variable to a NULL
|
|
|
+** pointer in case this file-control is not implemented. This file-control
|
|
|
+** is intended for diagnostic use only.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_VFS_POINTER]]
|
|
|
+** ^The [SQLITE_FCNTL_VFS_POINTER] opcode finds a pointer to the top-level
|
|
|
+** [VFSes] currently in use. ^(The argument X in
|
|
|
+** sqlite3_file_control(db,SQLITE_FCNTL_VFS_POINTER,X) must be
|
|
|
+** of type "[sqlite3_vfs] **". This opcodes will set *X
|
|
|
+** to a pointer to the top-level VFS.)^
|
|
|
+** ^When there are multiple VFS shims in the stack, this opcode finds the
|
|
|
+** upper-most shim only.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_PRAGMA]]
|
|
|
+** ^Whenever a [PRAGMA] statement is parsed, an [SQLITE_FCNTL_PRAGMA]
|
|
|
+** file control is sent to the open [sqlite3_file] object corresponding
|
|
|
+** to the database file to which the pragma statement refers. ^The argument
|
|
|
+** to the [SQLITE_FCNTL_PRAGMA] file control is an array of
|
|
|
+** pointers to strings (char**) in which the second element of the array
|
|
|
+** is the name of the pragma and the third element is the argument to the
|
|
|
+** pragma or NULL if the pragma has no argument. ^The handler for an
|
|
|
+** [SQLITE_FCNTL_PRAGMA] file control can optionally make the first element
|
|
|
+** of the char** argument point to a string obtained from [sqlite3_mprintf()]
|
|
|
+** or the equivalent and that string will become the result of the pragma or
|
|
|
+** the error message if the pragma fails. ^If the
|
|
|
+** [SQLITE_FCNTL_PRAGMA] file control returns [SQLITE_NOTFOUND], then normal
|
|
|
+** [PRAGMA] processing continues. ^If the [SQLITE_FCNTL_PRAGMA]
|
|
|
+** file control returns [SQLITE_OK], then the parser assumes that the
|
|
|
+** VFS has handled the PRAGMA itself and the parser generates a no-op
|
|
|
+** prepared statement if result string is NULL, or that returns a copy
|
|
|
+** of the result string if the string is non-NULL.
|
|
|
+** ^If the [SQLITE_FCNTL_PRAGMA] file control returns
|
|
|
+** any result code other than [SQLITE_OK] or [SQLITE_NOTFOUND], that means
|
|
|
+** that the VFS encountered an error while handling the [PRAGMA] and the
|
|
|
+** compilation of the PRAGMA fails with an error. ^The [SQLITE_FCNTL_PRAGMA]
|
|
|
+** file control occurs at the beginning of pragma statement analysis and so
|
|
|
+** it is able to override built-in [PRAGMA] statements.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_BUSYHANDLER]]
|
|
|
+** ^The [SQLITE_FCNTL_BUSYHANDLER]
|
|
|
+** file-control may be invoked by SQLite on the database file handle
|
|
|
+** shortly after it is opened in order to provide a custom VFS with access
|
|
|
+** to the connection's busy-handler callback. The argument is of type (void**)
|
|
|
+** - an array of two (void *) values. The first (void *) actually points
|
|
|
+** to a function of type (int (*)(void *)). In order to invoke the connection's
|
|
|
+** busy-handler, this function should be invoked with the second (void *) in
|
|
|
+** the array as the only argument. If it returns non-zero, then the operation
|
|
|
+** should be retried. If it returns zero, the custom VFS should abandon the
|
|
|
+** current operation.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_TEMPFILENAME]]
|
|
|
+** ^Applications can invoke the [SQLITE_FCNTL_TEMPFILENAME] file-control
|
|
|
+** to have SQLite generate a
|
|
|
+** temporary filename using the same algorithm that is followed to generate
|
|
|
+** temporary filenames for TEMP tables and other internal uses. The
|
|
|
+** argument should be a char** which will be filled with the filename
|
|
|
+** written into memory obtained from [sqlite3_malloc()]. The caller should
|
|
|
+** invoke [sqlite3_free()] on the result to avoid a memory leak.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_MMAP_SIZE]]
|
|
|
+** The [SQLITE_FCNTL_MMAP_SIZE] file control is used to query or set the
|
|
|
+** maximum number of bytes that will be used for memory-mapped I/O.
|
|
|
+** The argument is a pointer to a value of type sqlite3_int64 that
|
|
|
+** is an advisory maximum number of bytes in the file to memory map. The
|
|
|
+** pointer is overwritten with the old value. The limit is not changed if
|
|
|
+** the value originally pointed to is negative, and so the current limit
|
|
|
+** can be queried by passing in a pointer to a negative number. This
|
|
|
+** file-control is used internally to implement [PRAGMA mmap_size].
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_TRACE]]
|
|
|
+** The [SQLITE_FCNTL_TRACE] file control provides advisory information
|
|
|
+** to the VFS about what the higher layers of the SQLite stack are doing.
|
|
|
+** This file control is used by some VFS activity tracing [shims].
|
|
|
+** The argument is a zero-terminated string. Higher layers in the
|
|
|
+** SQLite stack may generate instances of this file control if
|
|
|
+** the [SQLITE_USE_FCNTL_TRACE] compile-time option is enabled.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_HAS_MOVED]]
|
|
|
+** The [SQLITE_FCNTL_HAS_MOVED] file control interprets its argument as a
|
|
|
+** pointer to an integer and it writes a boolean into that integer depending
|
|
|
+** on whether or not the file has been renamed, moved, or deleted since it
|
|
|
+** was first opened.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_WIN32_GET_HANDLE]]
|
|
|
+** The [SQLITE_FCNTL_WIN32_GET_HANDLE] opcode can be used to obtain the
|
|
|
+** underlying native file handle associated with a file handle. This file
|
|
|
+** control interprets its argument as a pointer to a native file handle and
|
|
|
+** writes the resulting value there.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_WIN32_SET_HANDLE]]
|
|
|
+** The [SQLITE_FCNTL_WIN32_SET_HANDLE] opcode is used for debugging. This
|
|
|
+** opcode causes the xFileControl method to swap the file handle with the one
|
|
|
+** pointed to by the pArg argument. This capability is used during testing
|
|
|
+** and only needs to be supported when SQLITE_TEST is defined.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_WAL_BLOCK]]
|
|
|
+** The [SQLITE_FCNTL_WAL_BLOCK] is a signal to the VFS layer that it might
|
|
|
+** be advantageous to block on the next WAL lock if the lock is not immediately
|
|
|
+** available. The WAL subsystem issues this signal during rare
|
|
|
+** circumstances in order to fix a problem with priority inversion.
|
|
|
+** Applications should <em>not</em> use this file-control.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_ZIPVFS]]
|
|
|
+** The [SQLITE_FCNTL_ZIPVFS] opcode is implemented by zipvfs only. All other
|
|
|
+** VFS should return SQLITE_NOTFOUND for this opcode.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_RBU]]
|
|
|
+** The [SQLITE_FCNTL_RBU] opcode is implemented by the special VFS used by
|
|
|
+** the RBU extension only. All other VFS should return SQLITE_NOTFOUND for
|
|
|
+** this opcode.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_BEGIN_ATOMIC_WRITE]]
|
|
|
+** If the [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] opcode returns SQLITE_OK, then
|
|
|
+** the file descriptor is placed in "batch write mode", which
|
|
|
+** means all subsequent write operations will be deferred and done
|
|
|
+** atomically at the next [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE]. Systems
|
|
|
+** that do not support batch atomic writes will return SQLITE_NOTFOUND.
|
|
|
+** ^Following a successful SQLITE_FCNTL_BEGIN_ATOMIC_WRITE and prior to
|
|
|
+** the closing [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] or
|
|
|
+** [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE], SQLite will make
|
|
|
+** no VFS interface calls on the same [sqlite3_file] file descriptor
|
|
|
+** except for calls to the xWrite method and the xFileControl method
|
|
|
+** with [SQLITE_FCNTL_SIZE_HINT].
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_COMMIT_ATOMIC_WRITE]]
|
|
|
+** The [SQLITE_FCNTL_COMMIT_ATOMIC_WRITE] opcode causes all write
|
|
|
+** operations since the previous successful call to
|
|
|
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be performed atomically.
|
|
|
+** This file control returns [SQLITE_OK] if and only if the writes were
|
|
|
+** all performed successfully and have been committed to persistent storage.
|
|
|
+** ^Regardless of whether or not it is successful, this file control takes
|
|
|
+** the file descriptor out of batch write mode so that all subsequent
|
|
|
+** write operations are independent.
|
|
|
+** ^SQLite will never invoke SQLITE_FCNTL_COMMIT_ATOMIC_WRITE without
|
|
|
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE]]
|
|
|
+** The [SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE] opcode causes all write
|
|
|
+** operations since the previous successful call to
|
|
|
+** [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE] to be rolled back.
|
|
|
+** ^This file control takes the file descriptor out of batch write mode
|
|
|
+** so that all subsequent write operations are independent.
|
|
|
+** ^SQLite will never invoke SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE without
|
|
|
+** a prior successful call to [SQLITE_FCNTL_BEGIN_ATOMIC_WRITE].
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_LOCK_TIMEOUT]]
|
|
|
+** The [SQLITE_FCNTL_LOCK_TIMEOUT] opcode is used to configure a VFS
|
|
|
+** to block for up to M milliseconds before failing when attempting to
|
|
|
+** obtain a file lock using the xLock or xShmLock methods of the VFS.
|
|
|
+** The parameter is a pointer to a 32-bit signed integer that contains
|
|
|
+** the value that M is to be set to. Before returning, the 32-bit signed
|
|
|
+** integer is overwritten with the previous value of M.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_DATA_VERSION]]
|
|
|
+** The [SQLITE_FCNTL_DATA_VERSION] opcode is used to detect changes to
|
|
|
+** a database file. The argument is a pointer to a 32-bit unsigned integer.
|
|
|
+** The "data version" for the pager is written into the pointer. The
|
|
|
+** "data version" changes whenever any change occurs to the corresponding
|
|
|
+** database file, either through SQL statements on the same database
|
|
|
+** connection or through transactions committed by separate database
|
|
|
+** connections possibly in other processes. The [sqlite3_total_changes()]
|
|
|
+** interface can be used to find if any database on the connection has changed,
|
|
|
+** but that interface responds to changes on TEMP as well as MAIN and does
|
|
|
+** not provide a mechanism to detect changes to MAIN only. Also, the
|
|
|
+** [sqlite3_total_changes()] interface responds to internal changes only and
|
|
|
+** omits changes made by other database connections. The
|
|
|
+** [PRAGMA data_version] command provides a mechanism to detect changes to
|
|
|
+** a single attached database that occur due to other database connections,
|
|
|
+** but omits changes implemented by the database connection on which it is
|
|
|
+** called. This file control is the only mechanism to detect changes that
|
|
|
+** happen either internally or externally and that are associated with
|
|
|
+** a particular attached database.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_CKPT_START]]
|
|
|
+** The [SQLITE_FCNTL_CKPT_START] opcode is invoked from within a checkpoint
|
|
|
+** in wal mode before the client starts to copy pages from the wal
|
|
|
+** file to the database file.
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_CKPT_DONE]]
|
|
|
+** The [SQLITE_FCNTL_CKPT_DONE] opcode is invoked from within a checkpoint
|
|
|
+** in wal mode after the client has finished copying pages from the wal
|
|
|
+** file to the database file, but before the *-shm file is updated to
|
|
|
+** record the fact that the pages have been checkpointed.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_EXTERNAL_READER]]
|
|
|
+** The EXPERIMENTAL [SQLITE_FCNTL_EXTERNAL_READER] opcode is used to detect
|
|
|
+** whether or not there is a database client in another process with a wal-mode
|
|
|
+** transaction open on the database or not. It is only available on unix.The
|
|
|
+** (void*) argument passed with this file-control should be a pointer to a
|
|
|
+** value of type (int). The integer value is set to 1 if the database is a wal
|
|
|
+** mode database and there exists at least one client in another process that
|
|
|
+** currently has an SQL transaction open on the database. It is set to 0 if
|
|
|
+** the database is not a wal-mode db, or if there is no such connection in any
|
|
|
+** other process. This opcode cannot be used to detect transactions opened
|
|
|
+** by clients within the current process, only within other processes.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** <li>[[SQLITE_FCNTL_CKSM_FILE]]
|
|
|
+** Used by the cksmvfs VFS module only.
|
|
|
+** </ul>
|
|
|
+*/
|
|
|
+#define SQLITE_FCNTL_LOCKSTATE 1
|
|
|
+#define SQLITE_FCNTL_GET_LOCKPROXYFILE 2
|
|
|
+#define SQLITE_FCNTL_SET_LOCKPROXYFILE 3
|
|
|
+#define SQLITE_FCNTL_LAST_ERRNO 4
|
|
|
+#define SQLITE_FCNTL_SIZE_HINT 5
|
|
|
+#define SQLITE_FCNTL_CHUNK_SIZE 6
|
|
|
+#define SQLITE_FCNTL_FILE_POINTER 7
|
|
|
+#define SQLITE_FCNTL_SYNC_OMITTED 8
|
|
|
+#define SQLITE_FCNTL_WIN32_AV_RETRY 9
|
|
|
+#define SQLITE_FCNTL_PERSIST_WAL 10
|
|
|
+#define SQLITE_FCNTL_OVERWRITE 11
|
|
|
+#define SQLITE_FCNTL_VFSNAME 12
|
|
|
+#define SQLITE_FCNTL_POWERSAFE_OVERWRITE 13
|
|
|
+#define SQLITE_FCNTL_PRAGMA 14
|
|
|
+#define SQLITE_FCNTL_BUSYHANDLER 15
|
|
|
+#define SQLITE_FCNTL_TEMPFILENAME 16
|
|
|
+#define SQLITE_FCNTL_MMAP_SIZE 18
|
|
|
+#define SQLITE_FCNTL_TRACE 19
|
|
|
+#define SQLITE_FCNTL_HAS_MOVED 20
|
|
|
+#define SQLITE_FCNTL_SYNC 21
|
|
|
+#define SQLITE_FCNTL_COMMIT_PHASETWO 22
|
|
|
+#define SQLITE_FCNTL_WIN32_SET_HANDLE 23
|
|
|
+#define SQLITE_FCNTL_WAL_BLOCK 24
|
|
|
+#define SQLITE_FCNTL_ZIPVFS 25
|
|
|
+#define SQLITE_FCNTL_RBU 26
|
|
|
+#define SQLITE_FCNTL_VFS_POINTER 27
|
|
|
+#define SQLITE_FCNTL_JOURNAL_POINTER 28
|
|
|
+#define SQLITE_FCNTL_WIN32_GET_HANDLE 29
|
|
|
+#define SQLITE_FCNTL_PDB 30
|
|
|
+#define SQLITE_FCNTL_BEGIN_ATOMIC_WRITE 31
|
|
|
+#define SQLITE_FCNTL_COMMIT_ATOMIC_WRITE 32
|
|
|
+#define SQLITE_FCNTL_ROLLBACK_ATOMIC_WRITE 33
|
|
|
+#define SQLITE_FCNTL_LOCK_TIMEOUT 34
|
|
|
+#define SQLITE_FCNTL_DATA_VERSION 35
|
|
|
+#define SQLITE_FCNTL_SIZE_LIMIT 36
|
|
|
+#define SQLITE_FCNTL_CKPT_DONE 37
|
|
|
+#define SQLITE_FCNTL_RESERVE_BYTES 38
|
|
|
+#define SQLITE_FCNTL_CKPT_START 39
|
|
|
+#define SQLITE_FCNTL_EXTERNAL_READER 40
|
|
|
+#define SQLITE_FCNTL_CKSM_FILE 41
|
|
|
+
|
|
|
+/* deprecated names */
|
|
|
+#define SQLITE_GET_LOCKPROXYFILE SQLITE_FCNTL_GET_LOCKPROXYFILE
|
|
|
+#define SQLITE_SET_LOCKPROXYFILE SQLITE_FCNTL_SET_LOCKPROXYFILE
|
|
|
+#define SQLITE_LAST_ERRNO SQLITE_FCNTL_LAST_ERRNO
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Mutex Handle
|
|
|
+**
|
|
|
+** The mutex module within SQLite defines [sqlite3_mutex] to be an
|
|
|
+** abstract type for a mutex object. The SQLite core never looks
|
|
|
+** at the internal representation of an [sqlite3_mutex]. It only
|
|
|
+** deals with pointers to the [sqlite3_mutex] object.
|
|
|
+**
|
|
|
+** Mutexes are created using [sqlite3_mutex_alloc()].
|
|
|
+*/
|
|
|
+typedef struct sqlite3_mutex sqlite3_mutex;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Loadable Extension Thunk
|
|
|
+**
|
|
|
+** A pointer to the opaque sqlite3_api_routines structure is passed as
|
|
|
+** the third parameter to entry points of [loadable extensions]. This
|
|
|
+** structure must be typedefed in order to work around compiler warnings
|
|
|
+** on some platforms.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_api_routines sqlite3_api_routines;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: OS Interface Object
|
|
|
+**
|
|
|
+** An instance of the sqlite3_vfs object defines the interface between
|
|
|
+** the SQLite core and the underlying operating system. The "vfs"
|
|
|
+** in the name of the object stands for "virtual file system". See
|
|
|
+** the [VFS | VFS documentation] for further information.
|
|
|
+**
|
|
|
+** The VFS interface is sometimes extended by adding new methods onto
|
|
|
+** the end. Each time such an extension occurs, the iVersion field
|
|
|
+** is incremented. The iVersion value started out as 1 in
|
|
|
+** SQLite [version 3.5.0] on [dateof:3.5.0], then increased to 2
|
|
|
+** with SQLite [version 3.7.0] on [dateof:3.7.0], and then increased
|
|
|
+** to 3 with SQLite [version 3.7.6] on [dateof:3.7.6]. Additional fields
|
|
|
+** may be appended to the sqlite3_vfs object and the iVersion value
|
|
|
+** may increase again in future versions of SQLite.
|
|
|
+** Note that due to an oversight, the structure
|
|
|
+** of the sqlite3_vfs object changed in the transition from
|
|
|
+** SQLite [version 3.5.9] to [version 3.6.0] on [dateof:3.6.0]
|
|
|
+** and yet the iVersion field was not increased.
|
|
|
+**
|
|
|
+** The szOsFile field is the size of the subclassed [sqlite3_file]
|
|
|
+** structure used by this VFS. mxPathname is the maximum length of
|
|
|
+** a pathname in this VFS.
|
|
|
+**
|
|
|
+** Registered sqlite3_vfs objects are kept on a linked list formed by
|
|
|
+** the pNext pointer. The [sqlite3_vfs_register()]
|
|
|
+** and [sqlite3_vfs_unregister()] interfaces manage this list
|
|
|
+** in a thread-safe way. The [sqlite3_vfs_find()] interface
|
|
|
+** searches the list. Neither the application code nor the VFS
|
|
|
+** implementation should use the pNext pointer.
|
|
|
+**
|
|
|
+** The pNext field is the only field in the sqlite3_vfs
|
|
|
+** structure that SQLite will ever modify. SQLite will only access
|
|
|
+** or modify this field while holding a particular static mutex.
|
|
|
+** The application should never modify anything within the sqlite3_vfs
|
|
|
+** object once the object has been registered.
|
|
|
+**
|
|
|
+** The zName field holds the name of the VFS module. The name must
|
|
|
+** be unique across all VFS modules.
|
|
|
+**
|
|
|
+** [[sqlite3_vfs.xOpen]]
|
|
|
+** ^SQLite guarantees that the zFilename parameter to xOpen
|
|
|
+** is either a NULL pointer or string obtained
|
|
|
+** from xFullPathname() with an optional suffix added.
|
|
|
+** ^If a suffix is added to the zFilename parameter, it will
|
|
|
+** consist of a single "-" character followed by no more than
|
|
|
+** 11 alphanumeric and/or "-" characters.
|
|
|
+** ^SQLite further guarantees that
|
|
|
+** the string will be valid and unchanged until xClose() is
|
|
|
+** called. Because of the previous sentence,
|
|
|
+** the [sqlite3_file] can safely store a pointer to the
|
|
|
+** filename if it needs to remember the filename for some reason.
|
|
|
+** If the zFilename parameter to xOpen is a NULL pointer then xOpen
|
|
|
+** must invent its own temporary name for the file. ^Whenever the
|
|
|
+** xFilename parameter is NULL it will also be the case that the
|
|
|
+** flags parameter will include [SQLITE_OPEN_DELETEONCLOSE].
|
|
|
+**
|
|
|
+** The flags argument to xOpen() includes all bits set in
|
|
|
+** the flags argument to [sqlite3_open_v2()]. Or if [sqlite3_open()]
|
|
|
+** or [sqlite3_open16()] is used, then flags includes at least
|
|
|
+** [SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE].
|
|
|
+** If xOpen() opens a file read-only then it sets *pOutFlags to
|
|
|
+** include [SQLITE_OPEN_READONLY]. Other bits in *pOutFlags may be set.
|
|
|
+**
|
|
|
+** ^(SQLite will also add one of the following flags to the xOpen()
|
|
|
+** call, depending on the object being opened:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> [SQLITE_OPEN_MAIN_DB]
|
|
|
+** <li> [SQLITE_OPEN_MAIN_JOURNAL]
|
|
|
+** <li> [SQLITE_OPEN_TEMP_DB]
|
|
|
+** <li> [SQLITE_OPEN_TEMP_JOURNAL]
|
|
|
+** <li> [SQLITE_OPEN_TRANSIENT_DB]
|
|
|
+** <li> [SQLITE_OPEN_SUBJOURNAL]
|
|
|
+** <li> [SQLITE_OPEN_SUPER_JOURNAL]
|
|
|
+** <li> [SQLITE_OPEN_WAL]
|
|
|
+** </ul>)^
|
|
|
+**
|
|
|
+** The file I/O implementation can use the object type flags to
|
|
|
+** change the way it deals with files. For example, an application
|
|
|
+** that does not care about crash recovery or rollback might make
|
|
|
+** the open of a journal file a no-op. Writes to this journal would
|
|
|
+** also be no-ops, and any attempt to read the journal would return
|
|
|
+** SQLITE_IOERR. Or the implementation might recognize that a database
|
|
|
+** file will be doing page-aligned sector reads and writes in a random
|
|
|
+** order and set up its I/O subsystem accordingly.
|
|
|
+**
|
|
|
+** SQLite might also add one of the following flags to the xOpen method:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> [SQLITE_OPEN_DELETEONCLOSE]
|
|
|
+** <li> [SQLITE_OPEN_EXCLUSIVE]
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** The [SQLITE_OPEN_DELETEONCLOSE] flag means the file should be
|
|
|
+** deleted when it is closed. ^The [SQLITE_OPEN_DELETEONCLOSE]
|
|
|
+** will be set for TEMP databases and their journals, transient
|
|
|
+** databases, and subjournals.
|
|
|
+**
|
|
|
+** ^The [SQLITE_OPEN_EXCLUSIVE] flag is always used in conjunction
|
|
|
+** with the [SQLITE_OPEN_CREATE] flag, which are both directly
|
|
|
+** analogous to the O_EXCL and O_CREAT flags of the POSIX open()
|
|
|
+** API. The SQLITE_OPEN_EXCLUSIVE flag, when paired with the
|
|
|
+** SQLITE_OPEN_CREATE, is used to indicate that file should always
|
|
|
+** be created, and that it is an error if it already exists.
|
|
|
+** It is <i>not</i> used to indicate the file should be opened
|
|
|
+** for exclusive access.
|
|
|
+**
|
|
|
+** ^At least szOsFile bytes of memory are allocated by SQLite
|
|
|
+** to hold the [sqlite3_file] structure passed as the third
|
|
|
+** argument to xOpen. The xOpen method does not have to
|
|
|
+** allocate the structure; it should just fill it in. Note that
|
|
|
+** the xOpen method must set the sqlite3_file.pMethods to either
|
|
|
+** a valid [sqlite3_io_methods] object or to NULL. xOpen must do
|
|
|
+** this even if the open fails. SQLite expects that the sqlite3_file.pMethods
|
|
|
+** element will be valid after xOpen returns regardless of the success
|
|
|
+** or failure of the xOpen call.
|
|
|
+**
|
|
|
+** [[sqlite3_vfs.xAccess]]
|
|
|
+** ^The flags argument to xAccess() may be [SQLITE_ACCESS_EXISTS]
|
|
|
+** to test for the existence of a file, or [SQLITE_ACCESS_READWRITE] to
|
|
|
+** test whether a file is readable and writable, or [SQLITE_ACCESS_READ]
|
|
|
+** to test whether a file is at least readable. The SQLITE_ACCESS_READ
|
|
|
+** flag is never actually used and is not implemented in the built-in
|
|
|
+** VFSes of SQLite. The file is named by the second argument and can be a
|
|
|
+** directory. The xAccess method returns [SQLITE_OK] on success or some
|
|
|
+** non-zero error code if there is an I/O error or if the name of
|
|
|
+** the file given in the second argument is illegal. If SQLITE_OK
|
|
|
+** is returned, then non-zero or zero is written into *pResOut to indicate
|
|
|
+** whether or not the file is accessible.
|
|
|
+**
|
|
|
+** ^SQLite will always allocate at least mxPathname+1 bytes for the
|
|
|
+** output buffer xFullPathname. The exact size of the output buffer
|
|
|
+** is also passed as a parameter to both methods. If the output buffer
|
|
|
+** is not large enough, [SQLITE_CANTOPEN] should be returned. Since this is
|
|
|
+** handled as a fatal error by SQLite, vfs implementations should endeavor
|
|
|
+** to prevent this by setting mxPathname to a sufficiently large value.
|
|
|
+**
|
|
|
+** The xRandomness(), xSleep(), xCurrentTime(), and xCurrentTimeInt64()
|
|
|
+** interfaces are not strictly a part of the filesystem, but they are
|
|
|
+** included in the VFS structure for completeness.
|
|
|
+** The xRandomness() function attempts to return nBytes bytes
|
|
|
+** of good-quality randomness into zOut. The return value is
|
|
|
+** the actual number of bytes of randomness obtained.
|
|
|
+** The xSleep() method causes the calling thread to sleep for at
|
|
|
+** least the number of microseconds given. ^The xCurrentTime()
|
|
|
+** method returns a Julian Day Number for the current date and time as
|
|
|
+** a floating point value.
|
|
|
+** ^The xCurrentTimeInt64() method returns, as an integer, the Julian
|
|
|
+** Day Number multiplied by 86400000 (the number of milliseconds in
|
|
|
+** a 24-hour day).
|
|
|
+** ^SQLite will use the xCurrentTimeInt64() method to get the current
|
|
|
+** date and time if that method is available (if iVersion is 2 or
|
|
|
+** greater and the function pointer is not NULL) and will fall back
|
|
|
+** to xCurrentTime() if xCurrentTimeInt64() is unavailable.
|
|
|
+**
|
|
|
+** ^The xSetSystemCall(), xGetSystemCall(), and xNestSystemCall() interfaces
|
|
|
+** are not used by the SQLite core. These optional interfaces are provided
|
|
|
+** by some VFSes to facilitate testing of the VFS code. By overriding
|
|
|
+** system calls with functions under its control, a test program can
|
|
|
+** simulate faults and error conditions that would otherwise be difficult
|
|
|
+** or impossible to induce. The set of system calls that can be overridden
|
|
|
+** varies from one VFS to another, and from one version of the same VFS to the
|
|
|
+** next. Applications that use these interfaces must be prepared for any
|
|
|
+** or all of these interfaces to be NULL or for their behavior to change
|
|
|
+** from one release to the next. Applications must not attempt to access
|
|
|
+** any of these methods if the iVersion of the VFS is less than 3.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_vfs sqlite3_vfs;
|
|
|
+typedef void (*sqlite3_syscall_ptr)(void);
|
|
|
+struct sqlite3_vfs {
|
|
|
+ int iVersion; /* Structure version number (currently 3) */
|
|
|
+ int szOsFile; /* Size of subclassed sqlite3_file */
|
|
|
+ int mxPathname; /* Maximum file pathname length */
|
|
|
+ sqlite3_vfs *pNext; /* Next registered VFS */
|
|
|
+ const char *zName; /* Name of this virtual file system */
|
|
|
+ void *pAppData; /* Pointer to application-specific data */
|
|
|
+ int (*xOpen)(sqlite3_vfs*, const char *zName, sqlite3_file*,
|
|
|
+ int flags, int *pOutFlags);
|
|
|
+ int (*xDelete)(sqlite3_vfs*, const char *zName, int syncDir);
|
|
|
+ int (*xAccess)(sqlite3_vfs*, const char *zName, int flags, int *pResOut);
|
|
|
+ int (*xFullPathname)(sqlite3_vfs*, const char *zName, int nOut, char *zOut);
|
|
|
+ void *(*xDlOpen)(sqlite3_vfs*, const char *zFilename);
|
|
|
+ void (*xDlError)(sqlite3_vfs*, int nByte, char *zErrMsg);
|
|
|
+ void (*(*xDlSym)(sqlite3_vfs*,void*, const char *zSymbol))(void);
|
|
|
+ void (*xDlClose)(sqlite3_vfs*, void*);
|
|
|
+ int (*xRandomness)(sqlite3_vfs*, int nByte, char *zOut);
|
|
|
+ int (*xSleep)(sqlite3_vfs*, int microseconds);
|
|
|
+ int (*xCurrentTime)(sqlite3_vfs*, double*);
|
|
|
+ int (*xGetLastError)(sqlite3_vfs*, int, char *);
|
|
|
+ /*
|
|
|
+ ** The methods above are in version 1 of the sqlite_vfs object
|
|
|
+ ** definition. Those that follow are added in version 2 or later
|
|
|
+ */
|
|
|
+ int (*xCurrentTimeInt64)(sqlite3_vfs*, sqlite3_int64*);
|
|
|
+ /*
|
|
|
+ ** The methods above are in versions 1 and 2 of the sqlite_vfs object.
|
|
|
+ ** Those below are for version 3 and greater.
|
|
|
+ */
|
|
|
+ int (*xSetSystemCall)(sqlite3_vfs*, const char *zName, sqlite3_syscall_ptr);
|
|
|
+ sqlite3_syscall_ptr (*xGetSystemCall)(sqlite3_vfs*, const char *zName);
|
|
|
+ const char *(*xNextSystemCall)(sqlite3_vfs*, const char *zName);
|
|
|
+ /*
|
|
|
+ ** The methods above are in versions 1 through 3 of the sqlite_vfs object.
|
|
|
+ ** New fields may be appended in future versions. The iVersion
|
|
|
+ ** value will increment whenever this happens.
|
|
|
+ */
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Flags for the xAccess VFS method
|
|
|
+**
|
|
|
+** These integer constants can be used as the third parameter to
|
|
|
+** the xAccess method of an [sqlite3_vfs] object. They determine
|
|
|
+** what kind of permissions the xAccess method is looking for.
|
|
|
+** With SQLITE_ACCESS_EXISTS, the xAccess method
|
|
|
+** simply checks whether the file exists.
|
|
|
+** With SQLITE_ACCESS_READWRITE, the xAccess method
|
|
|
+** checks whether the named directory is both readable and writable
|
|
|
+** (in other words, if files can be added, removed, and renamed within
|
|
|
+** the directory).
|
|
|
+** The SQLITE_ACCESS_READWRITE constant is currently used only by the
|
|
|
+** [temp_store_directory pragma], though this could change in a future
|
|
|
+** release of SQLite.
|
|
|
+** With SQLITE_ACCESS_READ, the xAccess method
|
|
|
+** checks whether the file is readable. The SQLITE_ACCESS_READ constant is
|
|
|
+** currently unused, though it might be used in a future release of
|
|
|
+** SQLite.
|
|
|
+*/
|
|
|
+#define SQLITE_ACCESS_EXISTS 0
|
|
|
+#define SQLITE_ACCESS_READWRITE 1 /* Used by PRAGMA temp_store_directory */
|
|
|
+#define SQLITE_ACCESS_READ 2 /* Unused */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Flags for the xShmLock VFS method
|
|
|
+**
|
|
|
+** These integer constants define the various locking operations
|
|
|
+** allowed by the xShmLock method of [sqlite3_io_methods]. The
|
|
|
+** following are the only legal combinations of flags to the
|
|
|
+** xShmLock method:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> SQLITE_SHM_LOCK | SQLITE_SHM_SHARED
|
|
|
+** <li> SQLITE_SHM_LOCK | SQLITE_SHM_EXCLUSIVE
|
|
|
+** <li> SQLITE_SHM_UNLOCK | SQLITE_SHM_SHARED
|
|
|
+** <li> SQLITE_SHM_UNLOCK | SQLITE_SHM_EXCLUSIVE
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** When unlocking, the same SHARED or EXCLUSIVE flag must be supplied as
|
|
|
+** was given on the corresponding lock.
|
|
|
+**
|
|
|
+** The xShmLock method can transition between unlocked and SHARED or
|
|
|
+** between unlocked and EXCLUSIVE. It cannot transition between SHARED
|
|
|
+** and EXCLUSIVE.
|
|
|
+*/
|
|
|
+#define SQLITE_SHM_UNLOCK 1
|
|
|
+#define SQLITE_SHM_LOCK 2
|
|
|
+#define SQLITE_SHM_SHARED 4
|
|
|
+#define SQLITE_SHM_EXCLUSIVE 8
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Maximum xShmLock index
|
|
|
+**
|
|
|
+** The xShmLock method on [sqlite3_io_methods] may use values
|
|
|
+** between 0 and this upper bound as its "offset" argument.
|
|
|
+** The SQLite core will never attempt to acquire or release a
|
|
|
+** lock outside of this range
|
|
|
+*/
|
|
|
+#define SQLITE_SHM_NLOCK 8
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Initialize The SQLite Library
|
|
|
+**
|
|
|
+** ^The sqlite3_initialize() routine initializes the
|
|
|
+** SQLite library. ^The sqlite3_shutdown() routine
|
|
|
+** deallocates any resources that were allocated by sqlite3_initialize().
|
|
|
+** These routines are designed to aid in process initialization and
|
|
|
+** shutdown on embedded systems. Workstation applications using
|
|
|
+** SQLite normally do not need to invoke either of these routines.
|
|
|
+**
|
|
|
+** A call to sqlite3_initialize() is an "effective" call if it is
|
|
|
+** the first time sqlite3_initialize() is invoked during the lifetime of
|
|
|
+** the process, or if it is the first time sqlite3_initialize() is invoked
|
|
|
+** following a call to sqlite3_shutdown(). ^(Only an effective call
|
|
|
+** of sqlite3_initialize() does any initialization. All other calls
|
|
|
+** are harmless no-ops.)^
|
|
|
+**
|
|
|
+** A call to sqlite3_shutdown() is an "effective" call if it is the first
|
|
|
+** call to sqlite3_shutdown() since the last sqlite3_initialize(). ^(Only
|
|
|
+** an effective call to sqlite3_shutdown() does any deinitialization.
|
|
|
+** All other valid calls to sqlite3_shutdown() are harmless no-ops.)^
|
|
|
+**
|
|
|
+** The sqlite3_initialize() interface is threadsafe, but sqlite3_shutdown()
|
|
|
+** is not. The sqlite3_shutdown() interface must only be called from a
|
|
|
+** single thread. All open [database connections] must be closed and all
|
|
|
+** other SQLite resources must be deallocated prior to invoking
|
|
|
+** sqlite3_shutdown().
|
|
|
+**
|
|
|
+** Among other things, ^sqlite3_initialize() will invoke
|
|
|
+** sqlite3_os_init(). Similarly, ^sqlite3_shutdown()
|
|
|
+** will invoke sqlite3_os_end().
|
|
|
+**
|
|
|
+** ^The sqlite3_initialize() routine returns [SQLITE_OK] on success.
|
|
|
+** ^If for some reason, sqlite3_initialize() is unable to initialize
|
|
|
+** the library (perhaps it is unable to allocate a needed resource such
|
|
|
+** as a mutex) it returns an [error code] other than [SQLITE_OK].
|
|
|
+**
|
|
|
+** ^The sqlite3_initialize() routine is called internally by many other
|
|
|
+** SQLite interfaces so that an application usually does not need to
|
|
|
+** invoke sqlite3_initialize() directly. For example, [sqlite3_open()]
|
|
|
+** calls sqlite3_initialize() so the SQLite library will be automatically
|
|
|
+** initialized when [sqlite3_open()] is called if it has not be initialized
|
|
|
+** already. ^However, if SQLite is compiled with the [SQLITE_OMIT_AUTOINIT]
|
|
|
+** compile-time option, then the automatic calls to sqlite3_initialize()
|
|
|
+** are omitted and the application must call sqlite3_initialize() directly
|
|
|
+** prior to using any other SQLite interface. For maximum portability,
|
|
|
+** it is recommended that applications always invoke sqlite3_initialize()
|
|
|
+** directly prior to using any other SQLite interface. Future releases
|
|
|
+** of SQLite may require this. In other words, the behavior exhibited
|
|
|
+** when SQLite is compiled with [SQLITE_OMIT_AUTOINIT] might become the
|
|
|
+** default behavior in some future release of SQLite.
|
|
|
+**
|
|
|
+** The sqlite3_os_init() routine does operating-system specific
|
|
|
+** initialization of the SQLite library. The sqlite3_os_end()
|
|
|
+** routine undoes the effect of sqlite3_os_init(). Typical tasks
|
|
|
+** performed by these routines include allocation or deallocation
|
|
|
+** of static resources, initialization of global variables,
|
|
|
+** setting up a default [sqlite3_vfs] module, or setting up
|
|
|
+** a default configuration using [sqlite3_config()].
|
|
|
+**
|
|
|
+** The application should never invoke either sqlite3_os_init()
|
|
|
+** or sqlite3_os_end() directly. The application should only invoke
|
|
|
+** sqlite3_initialize() and sqlite3_shutdown(). The sqlite3_os_init()
|
|
|
+** interface is called automatically by sqlite3_initialize() and
|
|
|
+** sqlite3_os_end() is called by sqlite3_shutdown(). Appropriate
|
|
|
+** implementations for sqlite3_os_init() and sqlite3_os_end()
|
|
|
+** are built into SQLite when it is compiled for Unix, Windows, or OS/2.
|
|
|
+** When [custom builds | built for other platforms]
|
|
|
+** (using the [SQLITE_OS_OTHER=1] compile-time
|
|
|
+** option) the application must supply a suitable implementation for
|
|
|
+** sqlite3_os_init() and sqlite3_os_end(). An application-supplied
|
|
|
+** implementation of sqlite3_os_init() or sqlite3_os_end()
|
|
|
+** must return [SQLITE_OK] on success and some other [error code] upon
|
|
|
+** failure.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_initialize(void);
|
|
|
+SQLITE_API int sqlite3_shutdown(void);
|
|
|
+SQLITE_API int sqlite3_os_init(void);
|
|
|
+SQLITE_API int sqlite3_os_end(void);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Configuring The SQLite Library
|
|
|
+**
|
|
|
+** The sqlite3_config() interface is used to make global configuration
|
|
|
+** changes to SQLite in order to tune SQLite to the specific needs of
|
|
|
+** the application. The default configuration is recommended for most
|
|
|
+** applications and so this routine is usually not necessary. It is
|
|
|
+** provided to support rare applications with unusual needs.
|
|
|
+**
|
|
|
+** <b>The sqlite3_config() interface is not threadsafe. The application
|
|
|
+** must ensure that no other SQLite interfaces are invoked by other
|
|
|
+** threads while sqlite3_config() is running.</b>
|
|
|
+**
|
|
|
+** The sqlite3_config() interface
|
|
|
+** may only be invoked prior to library initialization using
|
|
|
+** [sqlite3_initialize()] or after shutdown by [sqlite3_shutdown()].
|
|
|
+** ^If sqlite3_config() is called after [sqlite3_initialize()] and before
|
|
|
+** [sqlite3_shutdown()] then it will return SQLITE_MISUSE.
|
|
|
+** Note, however, that ^sqlite3_config() can be called as part of the
|
|
|
+** implementation of an application-defined [sqlite3_os_init()].
|
|
|
+**
|
|
|
+** The first argument to sqlite3_config() is an integer
|
|
|
+** [configuration option] that determines
|
|
|
+** what property of SQLite is to be configured. Subsequent arguments
|
|
|
+** vary depending on the [configuration option]
|
|
|
+** in the first argument.
|
|
|
+**
|
|
|
+** ^When a configuration option is set, sqlite3_config() returns [SQLITE_OK].
|
|
|
+** ^If the option is unknown or SQLite is unable to set the option
|
|
|
+** then this routine returns a non-zero [error code].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_config(int, ...);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Configure database connections
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** The sqlite3_db_config() interface is used to make configuration
|
|
|
+** changes to a [database connection]. The interface is similar to
|
|
|
+** [sqlite3_config()] except that the changes apply to a single
|
|
|
+** [database connection] (specified in the first argument).
|
|
|
+**
|
|
|
+** The second argument to sqlite3_db_config(D,V,...) is the
|
|
|
+** [SQLITE_DBCONFIG_LOOKASIDE | configuration verb] - an integer code
|
|
|
+** that indicates what aspect of the [database connection] is being configured.
|
|
|
+** Subsequent arguments vary depending on the configuration verb.
|
|
|
+**
|
|
|
+** ^Calls to sqlite3_db_config() return SQLITE_OK if and only if
|
|
|
+** the call is considered successful.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_db_config(sqlite3*, int op, ...);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Memory Allocation Routines
|
|
|
+**
|
|
|
+** An instance of this object defines the interface between SQLite
|
|
|
+** and low-level memory allocation routines.
|
|
|
+**
|
|
|
+** This object is used in only one place in the SQLite interface.
|
|
|
+** A pointer to an instance of this object is the argument to
|
|
|
+** [sqlite3_config()] when the configuration option is
|
|
|
+** [SQLITE_CONFIG_MALLOC] or [SQLITE_CONFIG_GETMALLOC].
|
|
|
+** By creating an instance of this object
|
|
|
+** and passing it to [sqlite3_config]([SQLITE_CONFIG_MALLOC])
|
|
|
+** during configuration, an application can specify an alternative
|
|
|
+** memory allocation subsystem for SQLite to use for all of its
|
|
|
+** dynamic memory needs.
|
|
|
+**
|
|
|
+** Note that SQLite comes with several [built-in memory allocators]
|
|
|
+** that are perfectly adequate for the overwhelming majority of applications
|
|
|
+** and that this object is only useful to a tiny minority of applications
|
|
|
+** with specialized memory allocation requirements. This object is
|
|
|
+** also used during testing of SQLite in order to specify an alternative
|
|
|
+** memory allocator that simulates memory out-of-memory conditions in
|
|
|
+** order to verify that SQLite recovers gracefully from such
|
|
|
+** conditions.
|
|
|
+**
|
|
|
+** The xMalloc, xRealloc, and xFree methods must work like the
|
|
|
+** malloc(), realloc() and free() functions from the standard C library.
|
|
|
+** ^SQLite guarantees that the second argument to
|
|
|
+** xRealloc is always a value returned by a prior call to xRoundup.
|
|
|
+**
|
|
|
+** xSize should return the allocated size of a memory allocation
|
|
|
+** previously obtained from xMalloc or xRealloc. The allocated size
|
|
|
+** is always at least as big as the requested size but may be larger.
|
|
|
+**
|
|
|
+** The xRoundup method returns what would be the allocated size of
|
|
|
+** a memory allocation given a particular requested size. Most memory
|
|
|
+** allocators round up memory allocations at least to the next multiple
|
|
|
+** of 8. Some allocators round up to a larger multiple or to a power of 2.
|
|
|
+** Every memory allocation request coming in through [sqlite3_malloc()]
|
|
|
+** or [sqlite3_realloc()] first calls xRoundup. If xRoundup returns 0,
|
|
|
+** that causes the corresponding memory allocation to fail.
|
|
|
+**
|
|
|
+** The xInit method initializes the memory allocator. For example,
|
|
|
+** it might allocate any required mutexes or initialize internal data
|
|
|
+** structures. The xShutdown method is invoked (indirectly) by
|
|
|
+** [sqlite3_shutdown()] and should deallocate any resources acquired
|
|
|
+** by xInit. The pAppData pointer is used as the only parameter to
|
|
|
+** xInit and xShutdown.
|
|
|
+**
|
|
|
+** SQLite holds the [SQLITE_MUTEX_STATIC_MAIN] mutex when it invokes
|
|
|
+** the xInit method, so the xInit method need not be threadsafe. The
|
|
|
+** xShutdown method is only called from [sqlite3_shutdown()] so it does
|
|
|
+** not need to be threadsafe either. For all other methods, SQLite
|
|
|
+** holds the [SQLITE_MUTEX_STATIC_MEM] mutex as long as the
|
|
|
+** [SQLITE_CONFIG_MEMSTATUS] configuration option is turned on (which
|
|
|
+** it is by default) and so the methods are automatically serialized.
|
|
|
+** However, if [SQLITE_CONFIG_MEMSTATUS] is disabled, then the other
|
|
|
+** methods must be threadsafe or else make their own arrangements for
|
|
|
+** serialization.
|
|
|
+**
|
|
|
+** SQLite will never invoke xInit() more than once without an intervening
|
|
|
+** call to xShutdown().
|
|
|
+*/
|
|
|
+typedef struct sqlite3_mem_methods sqlite3_mem_methods;
|
|
|
+struct sqlite3_mem_methods {
|
|
|
+ void *(*xMalloc)(int); /* Memory allocation function */
|
|
|
+ void (*xFree)(void*); /* Free a prior allocation */
|
|
|
+ void *(*xRealloc)(void*,int); /* Resize an allocation */
|
|
|
+ int (*xSize)(void*); /* Return the size of an allocation */
|
|
|
+ int (*xRoundup)(int); /* Round up request size to allocation size */
|
|
|
+ int (*xInit)(void*); /* Initialize the memory allocator */
|
|
|
+ void (*xShutdown)(void*); /* Deinitialize the memory allocator */
|
|
|
+ void *pAppData; /* Argument to xInit() and xShutdown() */
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Configuration Options
|
|
|
+** KEYWORDS: {configuration option}
|
|
|
+**
|
|
|
+** These constants are the available integer configuration options that
|
|
|
+** can be passed as the first argument to the [sqlite3_config()] interface.
|
|
|
+**
|
|
|
+** New configuration options may be added in future releases of SQLite.
|
|
|
+** Existing configuration options might be discontinued. Applications
|
|
|
+** should check the return code from [sqlite3_config()] to make sure that
|
|
|
+** the call worked. The [sqlite3_config()] interface will return a
|
|
|
+** non-zero [error code] if a discontinued or unsupported configuration option
|
|
|
+** is invoked.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_CONFIG_SINGLETHREAD]] <dt>SQLITE_CONFIG_SINGLETHREAD</dt>
|
|
|
+** <dd>There are no arguments to this option. ^This option sets the
|
|
|
+** [threading mode] to Single-thread. In other words, it disables
|
|
|
+** all mutexing and puts SQLite into a mode where it can only be used
|
|
|
+** by a single thread. ^If SQLite is compiled with
|
|
|
+** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
|
|
|
+** it is not possible to change the [threading mode] from its default
|
|
|
+** value of Single-thread and so [sqlite3_config()] will return
|
|
|
+** [SQLITE_ERROR] if called with the SQLITE_CONFIG_SINGLETHREAD
|
|
|
+** configuration option.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_MULTITHREAD]] <dt>SQLITE_CONFIG_MULTITHREAD</dt>
|
|
|
+** <dd>There are no arguments to this option. ^This option sets the
|
|
|
+** [threading mode] to Multi-thread. In other words, it disables
|
|
|
+** mutexing on [database connection] and [prepared statement] objects.
|
|
|
+** The application is responsible for serializing access to
|
|
|
+** [database connections] and [prepared statements]. But other mutexes
|
|
|
+** are enabled so that SQLite will be safe to use in a multi-threaded
|
|
|
+** environment as long as no two threads attempt to use the same
|
|
|
+** [database connection] at the same time. ^If SQLite is compiled with
|
|
|
+** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
|
|
|
+** it is not possible to set the Multi-thread [threading mode] and
|
|
|
+** [sqlite3_config()] will return [SQLITE_ERROR] if called with the
|
|
|
+** SQLITE_CONFIG_MULTITHREAD configuration option.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_SERIALIZED]] <dt>SQLITE_CONFIG_SERIALIZED</dt>
|
|
|
+** <dd>There are no arguments to this option. ^This option sets the
|
|
|
+** [threading mode] to Serialized. In other words, this option enables
|
|
|
+** all mutexes including the recursive
|
|
|
+** mutexes on [database connection] and [prepared statement] objects.
|
|
|
+** In this mode (which is the default when SQLite is compiled with
|
|
|
+** [SQLITE_THREADSAFE=1]) the SQLite library will itself serialize access
|
|
|
+** to [database connections] and [prepared statements] so that the
|
|
|
+** application is free to use the same [database connection] or the
|
|
|
+** same [prepared statement] in different threads at the same time.
|
|
|
+** ^If SQLite is compiled with
|
|
|
+** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
|
|
|
+** it is not possible to set the Serialized [threading mode] and
|
|
|
+** [sqlite3_config()] will return [SQLITE_ERROR] if called with the
|
|
|
+** SQLITE_CONFIG_SERIALIZED configuration option.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_MALLOC]] <dt>SQLITE_CONFIG_MALLOC</dt>
|
|
|
+** <dd> ^(The SQLITE_CONFIG_MALLOC option takes a single argument which is
|
|
|
+** a pointer to an instance of the [sqlite3_mem_methods] structure.
|
|
|
+** The argument specifies
|
|
|
+** alternative low-level memory allocation routines to be used in place of
|
|
|
+** the memory allocation routines built into SQLite.)^ ^SQLite makes
|
|
|
+** its own private copy of the content of the [sqlite3_mem_methods] structure
|
|
|
+** before the [sqlite3_config()] call returns.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_GETMALLOC]] <dt>SQLITE_CONFIG_GETMALLOC</dt>
|
|
|
+** <dd> ^(The SQLITE_CONFIG_GETMALLOC option takes a single argument which
|
|
|
+** is a pointer to an instance of the [sqlite3_mem_methods] structure.
|
|
|
+** The [sqlite3_mem_methods]
|
|
|
+** structure is filled with the currently defined memory allocation routines.)^
|
|
|
+** This option can be used to overload the default memory allocation
|
|
|
+** routines with a wrapper that simulations memory allocation failure or
|
|
|
+** tracks memory usage, for example. </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_SMALL_MALLOC]] <dt>SQLITE_CONFIG_SMALL_MALLOC</dt>
|
|
|
+** <dd> ^The SQLITE_CONFIG_SMALL_MALLOC option takes single argument of
|
|
|
+** type int, interpreted as a boolean, which if true provides a hint to
|
|
|
+** SQLite that it should avoid large memory allocations if possible.
|
|
|
+** SQLite will run faster if it is free to make large memory allocations,
|
|
|
+** but some application might prefer to run slower in exchange for
|
|
|
+** guarantees about memory fragmentation that are possible if large
|
|
|
+** allocations are avoided. This hint is normally off.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_MEMSTATUS]] <dt>SQLITE_CONFIG_MEMSTATUS</dt>
|
|
|
+** <dd> ^The SQLITE_CONFIG_MEMSTATUS option takes single argument of type int,
|
|
|
+** interpreted as a boolean, which enables or disables the collection of
|
|
|
+** memory allocation statistics. ^(When memory allocation statistics are
|
|
|
+** disabled, the following SQLite interfaces become non-operational:
|
|
|
+** <ul>
|
|
|
+** <li> [sqlite3_hard_heap_limit64()]
|
|
|
+** <li> [sqlite3_memory_used()]
|
|
|
+** <li> [sqlite3_memory_highwater()]
|
|
|
+** <li> [sqlite3_soft_heap_limit64()]
|
|
|
+** <li> [sqlite3_status64()]
|
|
|
+** </ul>)^
|
|
|
+** ^Memory allocation statistics are enabled by default unless SQLite is
|
|
|
+** compiled with [SQLITE_DEFAULT_MEMSTATUS]=0 in which case memory
|
|
|
+** allocation statistics are disabled by default.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_SCRATCH]] <dt>SQLITE_CONFIG_SCRATCH</dt>
|
|
|
+** <dd> The SQLITE_CONFIG_SCRATCH option is no longer used.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_PAGECACHE]] <dt>SQLITE_CONFIG_PAGECACHE</dt>
|
|
|
+** <dd> ^The SQLITE_CONFIG_PAGECACHE option specifies a memory pool
|
|
|
+** that SQLite can use for the database page cache with the default page
|
|
|
+** cache implementation.
|
|
|
+** This configuration option is a no-op if an application-defined page
|
|
|
+** cache implementation is loaded using the [SQLITE_CONFIG_PCACHE2].
|
|
|
+** ^There are three arguments to SQLITE_CONFIG_PAGECACHE: A pointer to
|
|
|
+** 8-byte aligned memory (pMem), the size of each page cache line (sz),
|
|
|
+** and the number of cache lines (N).
|
|
|
+** The sz argument should be the size of the largest database page
|
|
|
+** (a power of two between 512 and 65536) plus some extra bytes for each
|
|
|
+** page header. ^The number of extra bytes needed by the page header
|
|
|
+** can be determined using [SQLITE_CONFIG_PCACHE_HDRSZ].
|
|
|
+** ^It is harmless, apart from the wasted memory,
|
|
|
+** for the sz parameter to be larger than necessary. The pMem
|
|
|
+** argument must be either a NULL pointer or a pointer to an 8-byte
|
|
|
+** aligned block of memory of at least sz*N bytes, otherwise
|
|
|
+** subsequent behavior is undefined.
|
|
|
+** ^When pMem is not NULL, SQLite will strive to use the memory provided
|
|
|
+** to satisfy page cache needs, falling back to [sqlite3_malloc()] if
|
|
|
+** a page cache line is larger than sz bytes or if all of the pMem buffer
|
|
|
+** is exhausted.
|
|
|
+** ^If pMem is NULL and N is non-zero, then each database connection
|
|
|
+** does an initial bulk allocation for page cache memory
|
|
|
+** from [sqlite3_malloc()] sufficient for N cache lines if N is positive or
|
|
|
+** of -1024*N bytes if N is negative, . ^If additional
|
|
|
+** page cache memory is needed beyond what is provided by the initial
|
|
|
+** allocation, then SQLite goes to [sqlite3_malloc()] separately for each
|
|
|
+** additional cache line. </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_HEAP]] <dt>SQLITE_CONFIG_HEAP</dt>
|
|
|
+** <dd> ^The SQLITE_CONFIG_HEAP option specifies a static memory buffer
|
|
|
+** that SQLite will use for all of its dynamic memory allocation needs
|
|
|
+** beyond those provided for by [SQLITE_CONFIG_PAGECACHE].
|
|
|
+** ^The SQLITE_CONFIG_HEAP option is only available if SQLite is compiled
|
|
|
+** with either [SQLITE_ENABLE_MEMSYS3] or [SQLITE_ENABLE_MEMSYS5] and returns
|
|
|
+** [SQLITE_ERROR] if invoked otherwise.
|
|
|
+** ^There are three arguments to SQLITE_CONFIG_HEAP:
|
|
|
+** An 8-byte aligned pointer to the memory,
|
|
|
+** the number of bytes in the memory buffer, and the minimum allocation size.
|
|
|
+** ^If the first pointer (the memory pointer) is NULL, then SQLite reverts
|
|
|
+** to using its default memory allocator (the system malloc() implementation),
|
|
|
+** undoing any prior invocation of [SQLITE_CONFIG_MALLOC]. ^If the
|
|
|
+** memory pointer is not NULL then the alternative memory
|
|
|
+** allocator is engaged to handle all of SQLites memory allocation needs.
|
|
|
+** The first pointer (the memory pointer) must be aligned to an 8-byte
|
|
|
+** boundary or subsequent behavior of SQLite will be undefined.
|
|
|
+** The minimum allocation size is capped at 2**12. Reasonable values
|
|
|
+** for the minimum allocation size are 2**5 through 2**8.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_MUTEX]] <dt>SQLITE_CONFIG_MUTEX</dt>
|
|
|
+** <dd> ^(The SQLITE_CONFIG_MUTEX option takes a single argument which is a
|
|
|
+** pointer to an instance of the [sqlite3_mutex_methods] structure.
|
|
|
+** The argument specifies alternative low-level mutex routines to be used
|
|
|
+** in place the mutex routines built into SQLite.)^ ^SQLite makes a copy of
|
|
|
+** the content of the [sqlite3_mutex_methods] structure before the call to
|
|
|
+** [sqlite3_config()] returns. ^If SQLite is compiled with
|
|
|
+** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
|
|
|
+** the entire mutexing subsystem is omitted from the build and hence calls to
|
|
|
+** [sqlite3_config()] with the SQLITE_CONFIG_MUTEX configuration option will
|
|
|
+** return [SQLITE_ERROR].</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_GETMUTEX]] <dt>SQLITE_CONFIG_GETMUTEX</dt>
|
|
|
+** <dd> ^(The SQLITE_CONFIG_GETMUTEX option takes a single argument which
|
|
|
+** is a pointer to an instance of the [sqlite3_mutex_methods] structure. The
|
|
|
+** [sqlite3_mutex_methods]
|
|
|
+** structure is filled with the currently defined mutex routines.)^
|
|
|
+** This option can be used to overload the default mutex allocation
|
|
|
+** routines with a wrapper used to track mutex usage for performance
|
|
|
+** profiling or testing, for example. ^If SQLite is compiled with
|
|
|
+** the [SQLITE_THREADSAFE | SQLITE_THREADSAFE=0] compile-time option then
|
|
|
+** the entire mutexing subsystem is omitted from the build and hence calls to
|
|
|
+** [sqlite3_config()] with the SQLITE_CONFIG_GETMUTEX configuration option will
|
|
|
+** return [SQLITE_ERROR].</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_LOOKASIDE]] <dt>SQLITE_CONFIG_LOOKASIDE</dt>
|
|
|
+** <dd> ^(The SQLITE_CONFIG_LOOKASIDE option takes two arguments that determine
|
|
|
+** the default size of lookaside memory on each [database connection].
|
|
|
+** The first argument is the
|
|
|
+** size of each lookaside buffer slot and the second is the number of
|
|
|
+** slots allocated to each database connection.)^ ^(SQLITE_CONFIG_LOOKASIDE
|
|
|
+** sets the <i>default</i> lookaside size. The [SQLITE_DBCONFIG_LOOKASIDE]
|
|
|
+** option to [sqlite3_db_config()] can be used to change the lookaside
|
|
|
+** configuration on individual connections.)^ </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_PCACHE2]] <dt>SQLITE_CONFIG_PCACHE2</dt>
|
|
|
+** <dd> ^(The SQLITE_CONFIG_PCACHE2 option takes a single argument which is
|
|
|
+** a pointer to an [sqlite3_pcache_methods2] object. This object specifies
|
|
|
+** the interface to a custom page cache implementation.)^
|
|
|
+** ^SQLite makes a copy of the [sqlite3_pcache_methods2] object.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_GETPCACHE2]] <dt>SQLITE_CONFIG_GETPCACHE2</dt>
|
|
|
+** <dd> ^(The SQLITE_CONFIG_GETPCACHE2 option takes a single argument which
|
|
|
+** is a pointer to an [sqlite3_pcache_methods2] object. SQLite copies of
|
|
|
+** the current page cache implementation into that object.)^ </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_LOG]] <dt>SQLITE_CONFIG_LOG</dt>
|
|
|
+** <dd> The SQLITE_CONFIG_LOG option is used to configure the SQLite
|
|
|
+** global [error log].
|
|
|
+** (^The SQLITE_CONFIG_LOG option takes two arguments: a pointer to a
|
|
|
+** function with a call signature of void(*)(void*,int,const char*),
|
|
|
+** and a pointer to void. ^If the function pointer is not NULL, it is
|
|
|
+** invoked by [sqlite3_log()] to process each logging event. ^If the
|
|
|
+** function pointer is NULL, the [sqlite3_log()] interface becomes a no-op.
|
|
|
+** ^The void pointer that is the second argument to SQLITE_CONFIG_LOG is
|
|
|
+** passed through as the first parameter to the application-defined logger
|
|
|
+** function whenever that function is invoked. ^The second parameter to
|
|
|
+** the logger function is a copy of the first parameter to the corresponding
|
|
|
+** [sqlite3_log()] call and is intended to be a [result code] or an
|
|
|
+** [extended result code]. ^The third parameter passed to the logger is
|
|
|
+** log message after formatting via [sqlite3_snprintf()].
|
|
|
+** The SQLite logging interface is not reentrant; the logger function
|
|
|
+** supplied by the application must not invoke any SQLite interface.
|
|
|
+** In a multi-threaded application, the application-defined logger
|
|
|
+** function must be threadsafe. </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_URI]] <dt>SQLITE_CONFIG_URI
|
|
|
+** <dd>^(The SQLITE_CONFIG_URI option takes a single argument of type int.
|
|
|
+** If non-zero, then URI handling is globally enabled. If the parameter is zero,
|
|
|
+** then URI handling is globally disabled.)^ ^If URI handling is globally
|
|
|
+** enabled, all filenames passed to [sqlite3_open()], [sqlite3_open_v2()],
|
|
|
+** [sqlite3_open16()] or
|
|
|
+** specified as part of [ATTACH] commands are interpreted as URIs, regardless
|
|
|
+** of whether or not the [SQLITE_OPEN_URI] flag is set when the database
|
|
|
+** connection is opened. ^If it is globally disabled, filenames are
|
|
|
+** only interpreted as URIs if the SQLITE_OPEN_URI flag is set when the
|
|
|
+** database connection is opened. ^(By default, URI handling is globally
|
|
|
+** disabled. The default value may be changed by compiling with the
|
|
|
+** [SQLITE_USE_URI] symbol defined.)^
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_COVERING_INDEX_SCAN]] <dt>SQLITE_CONFIG_COVERING_INDEX_SCAN
|
|
|
+** <dd>^The SQLITE_CONFIG_COVERING_INDEX_SCAN option takes a single integer
|
|
|
+** argument which is interpreted as a boolean in order to enable or disable
|
|
|
+** the use of covering indices for full table scans in the query optimizer.
|
|
|
+** ^The default setting is determined
|
|
|
+** by the [SQLITE_ALLOW_COVERING_INDEX_SCAN] compile-time option, or is "on"
|
|
|
+** if that compile-time option is omitted.
|
|
|
+** The ability to disable the use of covering indices for full table scans
|
|
|
+** is because some incorrectly coded legacy applications might malfunction
|
|
|
+** when the optimization is enabled. Providing the ability to
|
|
|
+** disable the optimization allows the older, buggy application code to work
|
|
|
+** without change even with newer versions of SQLite.
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_PCACHE]] [[SQLITE_CONFIG_GETPCACHE]]
|
|
|
+** <dt>SQLITE_CONFIG_PCACHE and SQLITE_CONFIG_GETPCACHE
|
|
|
+** <dd> These options are obsolete and should not be used by new code.
|
|
|
+** They are retained for backwards compatibility but are now no-ops.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_SQLLOG]]
|
|
|
+** <dt>SQLITE_CONFIG_SQLLOG
|
|
|
+** <dd>This option is only available if sqlite is compiled with the
|
|
|
+** [SQLITE_ENABLE_SQLLOG] pre-processor macro defined. The first argument should
|
|
|
+** be a pointer to a function of type void(*)(void*,sqlite3*,const char*, int).
|
|
|
+** The second should be of type (void*). The callback is invoked by the library
|
|
|
+** in three separate circumstances, identified by the value passed as the
|
|
|
+** fourth parameter. If the fourth parameter is 0, then the database connection
|
|
|
+** passed as the second argument has just been opened. The third argument
|
|
|
+** points to a buffer containing the name of the main database file. If the
|
|
|
+** fourth parameter is 1, then the SQL statement that the third parameter
|
|
|
+** points to has just been executed. Or, if the fourth parameter is 2, then
|
|
|
+** the connection being passed as the second parameter is being closed. The
|
|
|
+** third parameter is passed NULL In this case. An example of using this
|
|
|
+** configuration option can be seen in the "test_sqllog.c" source file in
|
|
|
+** the canonical SQLite source tree.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_MMAP_SIZE]]
|
|
|
+** <dt>SQLITE_CONFIG_MMAP_SIZE
|
|
|
+** <dd>^SQLITE_CONFIG_MMAP_SIZE takes two 64-bit integer (sqlite3_int64) values
|
|
|
+** that are the default mmap size limit (the default setting for
|
|
|
+** [PRAGMA mmap_size]) and the maximum allowed mmap size limit.
|
|
|
+** ^The default setting can be overridden by each database connection using
|
|
|
+** either the [PRAGMA mmap_size] command, or by using the
|
|
|
+** [SQLITE_FCNTL_MMAP_SIZE] file control. ^(The maximum allowed mmap size
|
|
|
+** will be silently truncated if necessary so that it does not exceed the
|
|
|
+** compile-time maximum mmap size set by the
|
|
|
+** [SQLITE_MAX_MMAP_SIZE] compile-time option.)^
|
|
|
+** ^If either argument to this option is negative, then that argument is
|
|
|
+** changed to its compile-time default.
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_WIN32_HEAPSIZE]]
|
|
|
+** <dt>SQLITE_CONFIG_WIN32_HEAPSIZE
|
|
|
+** <dd>^The SQLITE_CONFIG_WIN32_HEAPSIZE option is only available if SQLite is
|
|
|
+** compiled for Windows with the [SQLITE_WIN32_MALLOC] pre-processor macro
|
|
|
+** defined. ^SQLITE_CONFIG_WIN32_HEAPSIZE takes a 32-bit unsigned integer value
|
|
|
+** that specifies the maximum size of the created heap.
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_PCACHE_HDRSZ]]
|
|
|
+** <dt>SQLITE_CONFIG_PCACHE_HDRSZ
|
|
|
+** <dd>^The SQLITE_CONFIG_PCACHE_HDRSZ option takes a single parameter which
|
|
|
+** is a pointer to an integer and writes into that integer the number of extra
|
|
|
+** bytes per page required for each page in [SQLITE_CONFIG_PAGECACHE].
|
|
|
+** The amount of extra space required can change depending on the compiler,
|
|
|
+** target platform, and SQLite version.
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_PMASZ]]
|
|
|
+** <dt>SQLITE_CONFIG_PMASZ
|
|
|
+** <dd>^The SQLITE_CONFIG_PMASZ option takes a single parameter which
|
|
|
+** is an unsigned integer and sets the "Minimum PMA Size" for the multithreaded
|
|
|
+** sorter to that integer. The default minimum PMA Size is set by the
|
|
|
+** [SQLITE_SORTER_PMASZ] compile-time option. New threads are launched
|
|
|
+** to help with sort operations when multithreaded sorting
|
|
|
+** is enabled (using the [PRAGMA threads] command) and the amount of content
|
|
|
+** to be sorted exceeds the page size times the minimum of the
|
|
|
+** [PRAGMA cache_size] setting and this value.
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_STMTJRNL_SPILL]]
|
|
|
+** <dt>SQLITE_CONFIG_STMTJRNL_SPILL
|
|
|
+** <dd>^The SQLITE_CONFIG_STMTJRNL_SPILL option takes a single parameter which
|
|
|
+** becomes the [statement journal] spill-to-disk threshold.
|
|
|
+** [Statement journals] are held in memory until their size (in bytes)
|
|
|
+** exceeds this threshold, at which point they are written to disk.
|
|
|
+** Or if the threshold is -1, statement journals are always held
|
|
|
+** exclusively in memory.
|
|
|
+** Since many statement journals never become large, setting the spill
|
|
|
+** threshold to a value such as 64KiB can greatly reduce the amount of
|
|
|
+** I/O required to support statement rollback.
|
|
|
+** The default value for this setting is controlled by the
|
|
|
+** [SQLITE_STMTJRNL_SPILL] compile-time option.
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_SORTERREF_SIZE]]
|
|
|
+** <dt>SQLITE_CONFIG_SORTERREF_SIZE
|
|
|
+** <dd>The SQLITE_CONFIG_SORTERREF_SIZE option accepts a single parameter
|
|
|
+** of type (int) - the new value of the sorter-reference size threshold.
|
|
|
+** Usually, when SQLite uses an external sort to order records according
|
|
|
+** to an ORDER BY clause, all fields required by the caller are present in the
|
|
|
+** sorted records. However, if SQLite determines based on the declared type
|
|
|
+** of a table column that its values are likely to be very large - larger
|
|
|
+** than the configured sorter-reference size threshold - then a reference
|
|
|
+** is stored in each sorted record and the required column values loaded
|
|
|
+** from the database as records are returned in sorted order. The default
|
|
|
+** value for this option is to never use this optimization. Specifying a
|
|
|
+** negative value for this option restores the default behaviour.
|
|
|
+** This option is only available if SQLite is compiled with the
|
|
|
+** [SQLITE_ENABLE_SORTER_REFERENCES] compile-time option.
|
|
|
+**
|
|
|
+** [[SQLITE_CONFIG_MEMDB_MAXSIZE]]
|
|
|
+** <dt>SQLITE_CONFIG_MEMDB_MAXSIZE
|
|
|
+** <dd>The SQLITE_CONFIG_MEMDB_MAXSIZE option accepts a single parameter
|
|
|
+** [sqlite3_int64] parameter which is the default maximum size for an in-memory
|
|
|
+** database created using [sqlite3_deserialize()]. This default maximum
|
|
|
+** size can be adjusted up or down for individual databases using the
|
|
|
+** [SQLITE_FCNTL_SIZE_LIMIT] [sqlite3_file_control|file-control]. If this
|
|
|
+** configuration setting is never used, then the default maximum is determined
|
|
|
+** by the [SQLITE_MEMDB_DEFAULT_MAXSIZE] compile-time option. If that
|
|
|
+** compile-time option is not set, then the default maximum is 1073741824.
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_CONFIG_SINGLETHREAD 1 /* nil */
|
|
|
+#define SQLITE_CONFIG_MULTITHREAD 2 /* nil */
|
|
|
+#define SQLITE_CONFIG_SERIALIZED 3 /* nil */
|
|
|
+#define SQLITE_CONFIG_MALLOC 4 /* sqlite3_mem_methods* */
|
|
|
+#define SQLITE_CONFIG_GETMALLOC 5 /* sqlite3_mem_methods* */
|
|
|
+#define SQLITE_CONFIG_SCRATCH 6 /* No longer used */
|
|
|
+#define SQLITE_CONFIG_PAGECACHE 7 /* void*, int sz, int N */
|
|
|
+#define SQLITE_CONFIG_HEAP 8 /* void*, int nByte, int min */
|
|
|
+#define SQLITE_CONFIG_MEMSTATUS 9 /* boolean */
|
|
|
+#define SQLITE_CONFIG_MUTEX 10 /* sqlite3_mutex_methods* */
|
|
|
+#define SQLITE_CONFIG_GETMUTEX 11 /* sqlite3_mutex_methods* */
|
|
|
+/* previously SQLITE_CONFIG_CHUNKALLOC 12 which is now unused. */
|
|
|
+#define SQLITE_CONFIG_LOOKASIDE 13 /* int int */
|
|
|
+#define SQLITE_CONFIG_PCACHE 14 /* no-op */
|
|
|
+#define SQLITE_CONFIG_GETPCACHE 15 /* no-op */
|
|
|
+#define SQLITE_CONFIG_LOG 16 /* xFunc, void* */
|
|
|
+#define SQLITE_CONFIG_URI 17 /* int */
|
|
|
+#define SQLITE_CONFIG_PCACHE2 18 /* sqlite3_pcache_methods2* */
|
|
|
+#define SQLITE_CONFIG_GETPCACHE2 19 /* sqlite3_pcache_methods2* */
|
|
|
+#define SQLITE_CONFIG_COVERING_INDEX_SCAN 20 /* int */
|
|
|
+#define SQLITE_CONFIG_SQLLOG 21 /* xSqllog, void* */
|
|
|
+#define SQLITE_CONFIG_MMAP_SIZE 22 /* sqlite3_int64, sqlite3_int64 */
|
|
|
+#define SQLITE_CONFIG_WIN32_HEAPSIZE 23 /* int nByte */
|
|
|
+#define SQLITE_CONFIG_PCACHE_HDRSZ 24 /* int *psz */
|
|
|
+#define SQLITE_CONFIG_PMASZ 25 /* unsigned int szPma */
|
|
|
+#define SQLITE_CONFIG_STMTJRNL_SPILL 26 /* int nByte */
|
|
|
+#define SQLITE_CONFIG_SMALL_MALLOC 27 /* boolean */
|
|
|
+#define SQLITE_CONFIG_SORTERREF_SIZE 28 /* int nByte */
|
|
|
+#define SQLITE_CONFIG_MEMDB_MAXSIZE 29 /* sqlite3_int64 */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Database Connection Configuration Options
|
|
|
+**
|
|
|
+** These constants are the available integer configuration options that
|
|
|
+** can be passed as the second argument to the [sqlite3_db_config()] interface.
|
|
|
+**
|
|
|
+** New configuration options may be added in future releases of SQLite.
|
|
|
+** Existing configuration options might be discontinued. Applications
|
|
|
+** should check the return code from [sqlite3_db_config()] to make sure that
|
|
|
+** the call worked. ^The [sqlite3_db_config()] interface will return a
|
|
|
+** non-zero [error code] if a discontinued or unsupported configuration option
|
|
|
+** is invoked.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_DBCONFIG_LOOKASIDE]]
|
|
|
+** <dt>SQLITE_DBCONFIG_LOOKASIDE</dt>
|
|
|
+** <dd> ^This option takes three additional arguments that determine the
|
|
|
+** [lookaside memory allocator] configuration for the [database connection].
|
|
|
+** ^The first argument (the third parameter to [sqlite3_db_config()] is a
|
|
|
+** pointer to a memory buffer to use for lookaside memory.
|
|
|
+** ^The first argument after the SQLITE_DBCONFIG_LOOKASIDE verb
|
|
|
+** may be NULL in which case SQLite will allocate the
|
|
|
+** lookaside buffer itself using [sqlite3_malloc()]. ^The second argument is the
|
|
|
+** size of each lookaside buffer slot. ^The third argument is the number of
|
|
|
+** slots. The size of the buffer in the first argument must be greater than
|
|
|
+** or equal to the product of the second and third arguments. The buffer
|
|
|
+** must be aligned to an 8-byte boundary. ^If the second argument to
|
|
|
+** SQLITE_DBCONFIG_LOOKASIDE is not a multiple of 8, it is internally
|
|
|
+** rounded down to the next smaller multiple of 8. ^(The lookaside memory
|
|
|
+** configuration for a database connection can only be changed when that
|
|
|
+** connection is not currently using lookaside memory, or in other words
|
|
|
+** when the "current value" returned by
|
|
|
+** [sqlite3_db_status](D,[SQLITE_CONFIG_LOOKASIDE],...) is zero.
|
|
|
+** Any attempt to change the lookaside memory configuration when lookaside
|
|
|
+** memory is in use leaves the configuration unchanged and returns
|
|
|
+** [SQLITE_BUSY].)^</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_ENABLE_FKEY]]
|
|
|
+** <dt>SQLITE_DBCONFIG_ENABLE_FKEY</dt>
|
|
|
+** <dd> ^This option is used to enable or disable the enforcement of
|
|
|
+** [foreign key constraints]. There should be two additional arguments.
|
|
|
+** The first argument is an integer which is 0 to disable FK enforcement,
|
|
|
+** positive to enable FK enforcement or negative to leave FK enforcement
|
|
|
+** unchanged. The second parameter is a pointer to an integer into which
|
|
|
+** is written 0 or 1 to indicate whether FK enforcement is off or on
|
|
|
+** following this call. The second parameter may be a NULL pointer, in
|
|
|
+** which case the FK enforcement setting is not reported back. </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_ENABLE_TRIGGER]]
|
|
|
+** <dt>SQLITE_DBCONFIG_ENABLE_TRIGGER</dt>
|
|
|
+** <dd> ^This option is used to enable or disable [CREATE TRIGGER | triggers].
|
|
|
+** There should be two additional arguments.
|
|
|
+** The first argument is an integer which is 0 to disable triggers,
|
|
|
+** positive to enable triggers or negative to leave the setting unchanged.
|
|
|
+** The second parameter is a pointer to an integer into which
|
|
|
+** is written 0 or 1 to indicate whether triggers are disabled or enabled
|
|
|
+** following this call. The second parameter may be a NULL pointer, in
|
|
|
+** which case the trigger setting is not reported back.
|
|
|
+**
|
|
|
+** <p>Originally this option disabled all triggers. ^(However, since
|
|
|
+** SQLite version 3.35.0, TEMP triggers are still allowed even if
|
|
|
+** this option is off. So, in other words, this option now only disables
|
|
|
+** triggers in the main database schema or in the schemas of ATTACH-ed
|
|
|
+** databases.)^ </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_ENABLE_VIEW]]
|
|
|
+** <dt>SQLITE_DBCONFIG_ENABLE_VIEW</dt>
|
|
|
+** <dd> ^This option is used to enable or disable [CREATE VIEW | views].
|
|
|
+** There should be two additional arguments.
|
|
|
+** The first argument is an integer which is 0 to disable views,
|
|
|
+** positive to enable views or negative to leave the setting unchanged.
|
|
|
+** The second parameter is a pointer to an integer into which
|
|
|
+** is written 0 or 1 to indicate whether views are disabled or enabled
|
|
|
+** following this call. The second parameter may be a NULL pointer, in
|
|
|
+** which case the view setting is not reported back.
|
|
|
+**
|
|
|
+** <p>Originally this option disabled all views. ^(However, since
|
|
|
+** SQLite version 3.35.0, TEMP views are still allowed even if
|
|
|
+** this option is off. So, in other words, this option now only disables
|
|
|
+** views in the main database schema or in the schemas of ATTACH-ed
|
|
|
+** databases.)^ </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER]]
|
|
|
+** <dt>SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER</dt>
|
|
|
+** <dd> ^This option is used to enable or disable the
|
|
|
+** [fts3_tokenizer()] function which is part of the
|
|
|
+** [FTS3] full-text search engine extension.
|
|
|
+** There should be two additional arguments.
|
|
|
+** The first argument is an integer which is 0 to disable fts3_tokenizer() or
|
|
|
+** positive to enable fts3_tokenizer() or negative to leave the setting
|
|
|
+** unchanged.
|
|
|
+** The second parameter is a pointer to an integer into which
|
|
|
+** is written 0 or 1 to indicate whether fts3_tokenizer is disabled or enabled
|
|
|
+** following this call. The second parameter may be a NULL pointer, in
|
|
|
+** which case the new setting is not reported back. </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION]]
|
|
|
+** <dt>SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION</dt>
|
|
|
+** <dd> ^This option is used to enable or disable the [sqlite3_load_extension()]
|
|
|
+** interface independently of the [load_extension()] SQL function.
|
|
|
+** The [sqlite3_enable_load_extension()] API enables or disables both the
|
|
|
+** C-API [sqlite3_load_extension()] and the SQL function [load_extension()].
|
|
|
+** There should be two additional arguments.
|
|
|
+** When the first argument to this interface is 1, then only the C-API is
|
|
|
+** enabled and the SQL function remains disabled. If the first argument to
|
|
|
+** this interface is 0, then both the C-API and the SQL function are disabled.
|
|
|
+** If the first argument is -1, then no changes are made to state of either the
|
|
|
+** C-API or the SQL function.
|
|
|
+** The second parameter is a pointer to an integer into which
|
|
|
+** is written 0 or 1 to indicate whether [sqlite3_load_extension()] interface
|
|
|
+** is disabled or enabled following this call. The second parameter may
|
|
|
+** be a NULL pointer, in which case the new setting is not reported back.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_MAINDBNAME]] <dt>SQLITE_DBCONFIG_MAINDBNAME</dt>
|
|
|
+** <dd> ^This option is used to change the name of the "main" database
|
|
|
+** schema. ^The sole argument is a pointer to a constant UTF8 string
|
|
|
+** which will become the new schema name in place of "main". ^SQLite
|
|
|
+** does not make a copy of the new main schema name string, so the application
|
|
|
+** must ensure that the argument passed into this DBCONFIG option is unchanged
|
|
|
+** until after the database connection closes.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE]]
|
|
|
+** <dt>SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE</dt>
|
|
|
+** <dd> Usually, when a database in wal mode is closed or detached from a
|
|
|
+** database handle, SQLite checks if this will mean that there are now no
|
|
|
+** connections at all to the database. If so, it performs a checkpoint
|
|
|
+** operation before closing the connection. This option may be used to
|
|
|
+** override this behaviour. The first parameter passed to this operation
|
|
|
+** is an integer - positive to disable checkpoints-on-close, or zero (the
|
|
|
+** default) to enable them, and negative to leave the setting unchanged.
|
|
|
+** The second parameter is a pointer to an integer
|
|
|
+** into which is written 0 or 1 to indicate whether checkpoints-on-close
|
|
|
+** have been disabled - 0 if they are not disabled, 1 if they are.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_ENABLE_QPSG]] <dt>SQLITE_DBCONFIG_ENABLE_QPSG</dt>
|
|
|
+** <dd>^(The SQLITE_DBCONFIG_ENABLE_QPSG option activates or deactivates
|
|
|
+** the [query planner stability guarantee] (QPSG). When the QPSG is active,
|
|
|
+** a single SQL query statement will always use the same algorithm regardless
|
|
|
+** of values of [bound parameters].)^ The QPSG disables some query optimizations
|
|
|
+** that look at the values of bound parameters, which can make some queries
|
|
|
+** slower. But the QPSG has the advantage of more predictable behavior. With
|
|
|
+** the QPSG active, SQLite will always use the same query plan in the field as
|
|
|
+** was used during testing in the lab.
|
|
|
+** The first argument to this setting is an integer which is 0 to disable
|
|
|
+** the QPSG, positive to enable QPSG, or negative to leave the setting
|
|
|
+** unchanged. The second parameter is a pointer to an integer into which
|
|
|
+** is written 0 or 1 to indicate whether the QPSG is disabled or enabled
|
|
|
+** following this call.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_TRIGGER_EQP]] <dt>SQLITE_DBCONFIG_TRIGGER_EQP</dt>
|
|
|
+** <dd> By default, the output of EXPLAIN QUERY PLAN commands does not
|
|
|
+** include output for any operations performed by trigger programs. This
|
|
|
+** option is used to set or clear (the default) a flag that governs this
|
|
|
+** behavior. The first parameter passed to this operation is an integer -
|
|
|
+** positive to enable output for trigger programs, or zero to disable it,
|
|
|
+** or negative to leave the setting unchanged.
|
|
|
+** The second parameter is a pointer to an integer into which is written
|
|
|
+** 0 or 1 to indicate whether output-for-triggers has been disabled - 0 if
|
|
|
+** it is not disabled, 1 if it is.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_RESET_DATABASE]] <dt>SQLITE_DBCONFIG_RESET_DATABASE</dt>
|
|
|
+** <dd> Set the SQLITE_DBCONFIG_RESET_DATABASE flag and then run
|
|
|
+** [VACUUM] in order to reset a database back to an empty database
|
|
|
+** with no schema and no content. The following process works even for
|
|
|
+** a badly corrupted database file:
|
|
|
+** <ol>
|
|
|
+** <li> If the database connection is newly opened, make sure it has read the
|
|
|
+** database schema by preparing then discarding some query against the
|
|
|
+** database, or calling sqlite3_table_column_metadata(), ignoring any
|
|
|
+** errors. This step is only necessary if the application desires to keep
|
|
|
+** the database in WAL mode after the reset if it was in WAL mode before
|
|
|
+** the reset.
|
|
|
+** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 1, 0);
|
|
|
+** <li> [sqlite3_exec](db, "[VACUUM]", 0, 0, 0);
|
|
|
+** <li> sqlite3_db_config(db, SQLITE_DBCONFIG_RESET_DATABASE, 0, 0);
|
|
|
+** </ol>
|
|
|
+** Because resetting a database is destructive and irreversible, the
|
|
|
+** process requires the use of this obscure API and multiple steps to help
|
|
|
+** ensure that it does not happen by accident.
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_DEFENSIVE]] <dt>SQLITE_DBCONFIG_DEFENSIVE</dt>
|
|
|
+** <dd>The SQLITE_DBCONFIG_DEFENSIVE option activates or deactivates the
|
|
|
+** "defensive" flag for a database connection. When the defensive
|
|
|
+** flag is enabled, language features that allow ordinary SQL to
|
|
|
+** deliberately corrupt the database file are disabled. The disabled
|
|
|
+** features include but are not limited to the following:
|
|
|
+** <ul>
|
|
|
+** <li> The [PRAGMA writable_schema=ON] statement.
|
|
|
+** <li> The [PRAGMA journal_mode=OFF] statement.
|
|
|
+** <li> Writes to the [sqlite_dbpage] virtual table.
|
|
|
+** <li> Direct writes to [shadow tables].
|
|
|
+** </ul>
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_WRITABLE_SCHEMA]] <dt>SQLITE_DBCONFIG_WRITABLE_SCHEMA</dt>
|
|
|
+** <dd>The SQLITE_DBCONFIG_WRITABLE_SCHEMA option activates or deactivates the
|
|
|
+** "writable_schema" flag. This has the same effect and is logically equivalent
|
|
|
+** to setting [PRAGMA writable_schema=ON] or [PRAGMA writable_schema=OFF].
|
|
|
+** The first argument to this setting is an integer which is 0 to disable
|
|
|
+** the writable_schema, positive to enable writable_schema, or negative to
|
|
|
+** leave the setting unchanged. The second parameter is a pointer to an
|
|
|
+** integer into which is written 0 or 1 to indicate whether the writable_schema
|
|
|
+** is enabled or disabled following this call.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_LEGACY_ALTER_TABLE]]
|
|
|
+** <dt>SQLITE_DBCONFIG_LEGACY_ALTER_TABLE</dt>
|
|
|
+** <dd>The SQLITE_DBCONFIG_LEGACY_ALTER_TABLE option activates or deactivates
|
|
|
+** the legacy behavior of the [ALTER TABLE RENAME] command such it
|
|
|
+** behaves as it did prior to [version 3.24.0] (2018-06-04). See the
|
|
|
+** "Compatibility Notice" on the [ALTER TABLE RENAME documentation] for
|
|
|
+** additional information. This feature can also be turned on and off
|
|
|
+** using the [PRAGMA legacy_alter_table] statement.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_DQS_DML]]
|
|
|
+** <dt>SQLITE_DBCONFIG_DQS_DML</td>
|
|
|
+** <dd>The SQLITE_DBCONFIG_DQS_DML option activates or deactivates
|
|
|
+** the legacy [double-quoted string literal] misfeature for DML statements
|
|
|
+** only, that is DELETE, INSERT, SELECT, and UPDATE statements. The
|
|
|
+** default value of this setting is determined by the [-DSQLITE_DQS]
|
|
|
+** compile-time option.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_DQS_DDL]]
|
|
|
+** <dt>SQLITE_DBCONFIG_DQS_DDL</td>
|
|
|
+** <dd>The SQLITE_DBCONFIG_DQS option activates or deactivates
|
|
|
+** the legacy [double-quoted string literal] misfeature for DDL statements,
|
|
|
+** such as CREATE TABLE and CREATE INDEX. The
|
|
|
+** default value of this setting is determined by the [-DSQLITE_DQS]
|
|
|
+** compile-time option.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_TRUSTED_SCHEMA]]
|
|
|
+** <dt>SQLITE_DBCONFIG_TRUSTED_SCHEMA</td>
|
|
|
+** <dd>The SQLITE_DBCONFIG_TRUSTED_SCHEMA option tells SQLite to
|
|
|
+** assume that database schemas are untainted by malicious content.
|
|
|
+** When the SQLITE_DBCONFIG_TRUSTED_SCHEMA option is disabled, SQLite
|
|
|
+** takes additional defensive steps to protect the application from harm
|
|
|
+** including:
|
|
|
+** <ul>
|
|
|
+** <li> Prohibit the use of SQL functions inside triggers, views,
|
|
|
+** CHECK constraints, DEFAULT clauses, expression indexes,
|
|
|
+** partial indexes, or generated columns
|
|
|
+** unless those functions are tagged with [SQLITE_INNOCUOUS].
|
|
|
+** <li> Prohibit the use of virtual tables inside of triggers or views
|
|
|
+** unless those virtual tables are tagged with [SQLITE_VTAB_INNOCUOUS].
|
|
|
+** </ul>
|
|
|
+** This setting defaults to "on" for legacy compatibility, however
|
|
|
+** all applications are advised to turn it off if possible. This setting
|
|
|
+** can also be controlled using the [PRAGMA trusted_schema] statement.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBCONFIG_LEGACY_FILE_FORMAT]]
|
|
|
+** <dt>SQLITE_DBCONFIG_LEGACY_FILE_FORMAT</td>
|
|
|
+** <dd>The SQLITE_DBCONFIG_LEGACY_FILE_FORMAT option activates or deactivates
|
|
|
+** the legacy file format flag. When activated, this flag causes all newly
|
|
|
+** created database file to have a schema format version number (the 4-byte
|
|
|
+** integer found at offset 44 into the database header) of 1. This in turn
|
|
|
+** means that the resulting database file will be readable and writable by
|
|
|
+** any SQLite version back to 3.0.0 ([dateof:3.0.0]). Without this setting,
|
|
|
+** newly created databases are generally not understandable by SQLite versions
|
|
|
+** prior to 3.3.0 ([dateof:3.3.0]). As these words are written, there
|
|
|
+** is now scarcely any need to generated database files that are compatible
|
|
|
+** all the way back to version 3.0.0, and so this setting is of little
|
|
|
+** practical use, but is provided so that SQLite can continue to claim the
|
|
|
+** ability to generate new database files that are compatible with version
|
|
|
+** 3.0.0.
|
|
|
+** <p>Note that when the SQLITE_DBCONFIG_LEGACY_FILE_FORMAT setting is on,
|
|
|
+** the [VACUUM] command will fail with an obscure error when attempting to
|
|
|
+** process a table with generated columns and a descending index. This is
|
|
|
+** not considered a bug since SQLite versions 3.3.0 and earlier do not support
|
|
|
+** either generated columns or decending indexes.
|
|
|
+** </dd>
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_DBCONFIG_MAINDBNAME 1000 /* const char* */
|
|
|
+#define SQLITE_DBCONFIG_LOOKASIDE 1001 /* void* int int */
|
|
|
+#define SQLITE_DBCONFIG_ENABLE_FKEY 1002 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_ENABLE_TRIGGER 1003 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_ENABLE_FTS3_TOKENIZER 1004 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION 1005 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_NO_CKPT_ON_CLOSE 1006 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_ENABLE_QPSG 1007 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_TRIGGER_EQP 1008 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_RESET_DATABASE 1009 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_DEFENSIVE 1010 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_WRITABLE_SCHEMA 1011 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_LEGACY_ALTER_TABLE 1012 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_DQS_DML 1013 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_DQS_DDL 1014 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_ENABLE_VIEW 1015 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_LEGACY_FILE_FORMAT 1016 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_TRUSTED_SCHEMA 1017 /* int int* */
|
|
|
+#define SQLITE_DBCONFIG_MAX 1017 /* Largest DBCONFIG */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Enable Or Disable Extended Result Codes
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_extended_result_codes() routine enables or disables the
|
|
|
+** [extended result codes] feature of SQLite. ^The extended result
|
|
|
+** codes are disabled by default for historical compatibility.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_extended_result_codes(sqlite3*, int onoff);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Last Insert Rowid
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^Each entry in most SQLite tables (except for [WITHOUT ROWID] tables)
|
|
|
+** has a unique 64-bit signed
|
|
|
+** integer key called the [ROWID | "rowid"]. ^The rowid is always available
|
|
|
+** as an undeclared column named ROWID, OID, or _ROWID_ as long as those
|
|
|
+** names are not also used by explicitly declared columns. ^If
|
|
|
+** the table has a column of type [INTEGER PRIMARY KEY] then that column
|
|
|
+** is another alias for the rowid.
|
|
|
+**
|
|
|
+** ^The sqlite3_last_insert_rowid(D) interface usually returns the [rowid] of
|
|
|
+** the most recent successful [INSERT] into a rowid table or [virtual table]
|
|
|
+** on database connection D. ^Inserts into [WITHOUT ROWID] tables are not
|
|
|
+** recorded. ^If no successful [INSERT]s into rowid tables have ever occurred
|
|
|
+** on the database connection D, then sqlite3_last_insert_rowid(D) returns
|
|
|
+** zero.
|
|
|
+**
|
|
|
+** As well as being set automatically as rows are inserted into database
|
|
|
+** tables, the value returned by this function may be set explicitly by
|
|
|
+** [sqlite3_set_last_insert_rowid()]
|
|
|
+**
|
|
|
+** Some virtual table implementations may INSERT rows into rowid tables as
|
|
|
+** part of committing a transaction (e.g. to flush data accumulated in memory
|
|
|
+** to disk). In this case subsequent calls to this function return the rowid
|
|
|
+** associated with these internal INSERT operations, which leads to
|
|
|
+** unintuitive results. Virtual table implementations that do write to rowid
|
|
|
+** tables in this way can avoid this problem by restoring the original
|
|
|
+** rowid value using [sqlite3_set_last_insert_rowid()] before returning
|
|
|
+** control to the user.
|
|
|
+**
|
|
|
+** ^(If an [INSERT] occurs within a trigger then this routine will
|
|
|
+** return the [rowid] of the inserted row as long as the trigger is
|
|
|
+** running. Once the trigger program ends, the value returned
|
|
|
+** by this routine reverts to what it was before the trigger was fired.)^
|
|
|
+**
|
|
|
+** ^An [INSERT] that fails due to a constraint violation is not a
|
|
|
+** successful [INSERT] and does not change the value returned by this
|
|
|
+** routine. ^Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK,
|
|
|
+** and INSERT OR ABORT make no changes to the return value of this
|
|
|
+** routine when their insertion fails. ^(When INSERT OR REPLACE
|
|
|
+** encounters a constraint violation, it does not fail. The
|
|
|
+** INSERT continues to completion after deleting rows that caused
|
|
|
+** the constraint problem so INSERT OR REPLACE will always change
|
|
|
+** the return value of this interface.)^
|
|
|
+**
|
|
|
+** ^For the purposes of this routine, an [INSERT] is considered to
|
|
|
+** be successful even if it is subsequently rolled back.
|
|
|
+**
|
|
|
+** This function is accessible to SQL statements via the
|
|
|
+** [last_insert_rowid() SQL function].
|
|
|
+**
|
|
|
+** If a separate thread performs a new [INSERT] on the same
|
|
|
+** database connection while the [sqlite3_last_insert_rowid()]
|
|
|
+** function is running and thus changes the last insert [rowid],
|
|
|
+** then the value returned by [sqlite3_last_insert_rowid()] is
|
|
|
+** unpredictable and might not equal either the old or the new
|
|
|
+** last insert [rowid].
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Set the Last Insert Rowid value.
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** The sqlite3_set_last_insert_rowid(D, R) method allows the application to
|
|
|
+** set the value returned by calling sqlite3_last_insert_rowid(D) to R
|
|
|
+** without inserting a row into the database.
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_set_last_insert_rowid(sqlite3*,sqlite3_int64);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Count The Number Of Rows Modified
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^These functions return the number of rows modified, inserted or
|
|
|
+** deleted by the most recently completed INSERT, UPDATE or DELETE
|
|
|
+** statement on the database connection specified by the only parameter.
|
|
|
+** The two functions are identical except for the type of the return value
|
|
|
+** and that if the number of rows modified by the most recent INSERT, UPDATE
|
|
|
+** or DELETE is greater than the maximum value supported by type "int", then
|
|
|
+** the return value of sqlite3_changes() is undefined. ^Executing any other
|
|
|
+** type of SQL statement does not modify the value returned by these functions.
|
|
|
+**
|
|
|
+** ^Only changes made directly by the INSERT, UPDATE or DELETE statement are
|
|
|
+** considered - auxiliary changes caused by [CREATE TRIGGER | triggers],
|
|
|
+** [foreign key actions] or [REPLACE] constraint resolution are not counted.
|
|
|
+**
|
|
|
+** Changes to a view that are intercepted by
|
|
|
+** [INSTEAD OF trigger | INSTEAD OF triggers] are not counted. ^The value
|
|
|
+** returned by sqlite3_changes() immediately after an INSERT, UPDATE or
|
|
|
+** DELETE statement run on a view is always zero. Only changes made to real
|
|
|
+** tables are counted.
|
|
|
+**
|
|
|
+** Things are more complicated if the sqlite3_changes() function is
|
|
|
+** executed while a trigger program is running. This may happen if the
|
|
|
+** program uses the [changes() SQL function], or if some other callback
|
|
|
+** function invokes sqlite3_changes() directly. Essentially:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> ^(Before entering a trigger program the value returned by
|
|
|
+** sqlite3_changes() function is saved. After the trigger program
|
|
|
+** has finished, the original value is restored.)^
|
|
|
+**
|
|
|
+** <li> ^(Within a trigger program each INSERT, UPDATE and DELETE
|
|
|
+** statement sets the value returned by sqlite3_changes()
|
|
|
+** upon completion as normal. Of course, this value will not include
|
|
|
+** any changes performed by sub-triggers, as the sqlite3_changes()
|
|
|
+** value will be saved and restored after each sub-trigger has run.)^
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** ^This means that if the changes() SQL function (or similar) is used
|
|
|
+** by the first INSERT, UPDATE or DELETE statement within a trigger, it
|
|
|
+** returns the value as set when the calling statement began executing.
|
|
|
+** ^If it is used by the second or subsequent such statement within a trigger
|
|
|
+** program, the value returned reflects the number of rows modified by the
|
|
|
+** previous INSERT, UPDATE or DELETE statement within the same trigger.
|
|
|
+**
|
|
|
+** If a separate thread makes changes on the same database connection
|
|
|
+** while [sqlite3_changes()] is running then the value returned
|
|
|
+** is unpredictable and not meaningful.
|
|
|
+**
|
|
|
+** See also:
|
|
|
+** <ul>
|
|
|
+** <li> the [sqlite3_total_changes()] interface
|
|
|
+** <li> the [count_changes pragma]
|
|
|
+** <li> the [changes() SQL function]
|
|
|
+** <li> the [data_version pragma]
|
|
|
+** </ul>
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_changes(sqlite3*);
|
|
|
+SQLITE_API sqlite3_int64 sqlite3_changes64(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Total Number Of Rows Modified
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^These functions return the total number of rows inserted, modified or
|
|
|
+** deleted by all [INSERT], [UPDATE] or [DELETE] statements completed
|
|
|
+** since the database connection was opened, including those executed as
|
|
|
+** part of trigger programs. The two functions are identical except for the
|
|
|
+** type of the return value and that if the number of rows modified by the
|
|
|
+** connection exceeds the maximum value supported by type "int", then
|
|
|
+** the return value of sqlite3_total_changes() is undefined. ^Executing
|
|
|
+** any other type of SQL statement does not affect the value returned by
|
|
|
+** sqlite3_total_changes().
|
|
|
+**
|
|
|
+** ^Changes made as part of [foreign key actions] are included in the
|
|
|
+** count, but those made as part of REPLACE constraint resolution are
|
|
|
+** not. ^Changes to a view that are intercepted by INSTEAD OF triggers
|
|
|
+** are not counted.
|
|
|
+**
|
|
|
+** The [sqlite3_total_changes(D)] interface only reports the number
|
|
|
+** of rows that changed due to SQL statement run against database
|
|
|
+** connection D. Any changes by other database connections are ignored.
|
|
|
+** To detect changes against a database file from other database
|
|
|
+** connections use the [PRAGMA data_version] command or the
|
|
|
+** [SQLITE_FCNTL_DATA_VERSION] [file control].
|
|
|
+**
|
|
|
+** If a separate thread makes changes on the same database connection
|
|
|
+** while [sqlite3_total_changes()] is running then the value
|
|
|
+** returned is unpredictable and not meaningful.
|
|
|
+**
|
|
|
+** See also:
|
|
|
+** <ul>
|
|
|
+** <li> the [sqlite3_changes()] interface
|
|
|
+** <li> the [count_changes pragma]
|
|
|
+** <li> the [changes() SQL function]
|
|
|
+** <li> the [data_version pragma]
|
|
|
+** <li> the [SQLITE_FCNTL_DATA_VERSION] [file control]
|
|
|
+** </ul>
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_total_changes(sqlite3*);
|
|
|
+SQLITE_API sqlite3_int64 sqlite3_total_changes64(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Interrupt A Long-Running Query
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^This function causes any pending database operation to abort and
|
|
|
+** return at its earliest opportunity. This routine is typically
|
|
|
+** called in response to a user action such as pressing "Cancel"
|
|
|
+** or Ctrl-C where the user wants a long query operation to halt
|
|
|
+** immediately.
|
|
|
+**
|
|
|
+** ^It is safe to call this routine from a thread different from the
|
|
|
+** thread that is currently running the database operation. But it
|
|
|
+** is not safe to call this routine with a [database connection] that
|
|
|
+** is closed or might close before sqlite3_interrupt() returns.
|
|
|
+**
|
|
|
+** ^If an SQL operation is very nearly finished at the time when
|
|
|
+** sqlite3_interrupt() is called, then it might not have an opportunity
|
|
|
+** to be interrupted and might continue to completion.
|
|
|
+**
|
|
|
+** ^An SQL operation that is interrupted will return [SQLITE_INTERRUPT].
|
|
|
+** ^If the interrupted SQL operation is an INSERT, UPDATE, or DELETE
|
|
|
+** that is inside an explicit transaction, then the entire transaction
|
|
|
+** will be rolled back automatically.
|
|
|
+**
|
|
|
+** ^The sqlite3_interrupt(D) call is in effect until all currently running
|
|
|
+** SQL statements on [database connection] D complete. ^Any new SQL statements
|
|
|
+** that are started after the sqlite3_interrupt() call and before the
|
|
|
+** running statement count reaches zero are interrupted as if they had been
|
|
|
+** running prior to the sqlite3_interrupt() call. ^New SQL statements
|
|
|
+** that are started after the running statement count reaches zero are
|
|
|
+** not effected by the sqlite3_interrupt().
|
|
|
+** ^A call to sqlite3_interrupt(D) that occurs when there are no running
|
|
|
+** SQL statements is a no-op and has no effect on SQL statements
|
|
|
+** that are started after the sqlite3_interrupt() call returns.
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_interrupt(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Determine If An SQL Statement Is Complete
|
|
|
+**
|
|
|
+** These routines are useful during command-line input to determine if the
|
|
|
+** currently entered text seems to form a complete SQL statement or
|
|
|
+** if additional input is needed before sending the text into
|
|
|
+** SQLite for parsing. ^These routines return 1 if the input string
|
|
|
+** appears to be a complete SQL statement. ^A statement is judged to be
|
|
|
+** complete if it ends with a semicolon token and is not a prefix of a
|
|
|
+** well-formed CREATE TRIGGER statement. ^Semicolons that are embedded within
|
|
|
+** string literals or quoted identifier names or comments are not
|
|
|
+** independent tokens (they are part of the token in which they are
|
|
|
+** embedded) and thus do not count as a statement terminator. ^Whitespace
|
|
|
+** and comments that follow the final semicolon are ignored.
|
|
|
+**
|
|
|
+** ^These routines return 0 if the statement is incomplete. ^If a
|
|
|
+** memory allocation fails, then SQLITE_NOMEM is returned.
|
|
|
+**
|
|
|
+** ^These routines do not parse the SQL statements thus
|
|
|
+** will not detect syntactically incorrect SQL.
|
|
|
+**
|
|
|
+** ^(If SQLite has not been initialized using [sqlite3_initialize()] prior
|
|
|
+** to invoking sqlite3_complete16() then sqlite3_initialize() is invoked
|
|
|
+** automatically by sqlite3_complete16(). If that initialization fails,
|
|
|
+** then the return value from sqlite3_complete16() will be non-zero
|
|
|
+** regardless of whether or not the input SQL is complete.)^
|
|
|
+**
|
|
|
+** The input to [sqlite3_complete()] must be a zero-terminated
|
|
|
+** UTF-8 string.
|
|
|
+**
|
|
|
+** The input to [sqlite3_complete16()] must be a zero-terminated
|
|
|
+** UTF-16 string in native byte order.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_complete(const char *sql);
|
|
|
+SQLITE_API int sqlite3_complete16(const void *sql);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Register A Callback To Handle SQLITE_BUSY Errors
|
|
|
+** KEYWORDS: {busy-handler callback} {busy handler}
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_busy_handler(D,X,P) routine sets a callback function X
|
|
|
+** that might be invoked with argument P whenever
|
|
|
+** an attempt is made to access a database table associated with
|
|
|
+** [database connection] D when another thread
|
|
|
+** or process has the table locked.
|
|
|
+** The sqlite3_busy_handler() interface is used to implement
|
|
|
+** [sqlite3_busy_timeout()] and [PRAGMA busy_timeout].
|
|
|
+**
|
|
|
+** ^If the busy callback is NULL, then [SQLITE_BUSY]
|
|
|
+** is returned immediately upon encountering the lock. ^If the busy callback
|
|
|
+** is not NULL, then the callback might be invoked with two arguments.
|
|
|
+**
|
|
|
+** ^The first argument to the busy handler is a copy of the void* pointer which
|
|
|
+** is the third argument to sqlite3_busy_handler(). ^The second argument to
|
|
|
+** the busy handler callback is the number of times that the busy handler has
|
|
|
+** been invoked previously for the same locking event. ^If the
|
|
|
+** busy callback returns 0, then no additional attempts are made to
|
|
|
+** access the database and [SQLITE_BUSY] is returned
|
|
|
+** to the application.
|
|
|
+** ^If the callback returns non-zero, then another attempt
|
|
|
+** is made to access the database and the cycle repeats.
|
|
|
+**
|
|
|
+** The presence of a busy handler does not guarantee that it will be invoked
|
|
|
+** when there is lock contention. ^If SQLite determines that invoking the busy
|
|
|
+** handler could result in a deadlock, it will go ahead and return [SQLITE_BUSY]
|
|
|
+** to the application instead of invoking the
|
|
|
+** busy handler.
|
|
|
+** Consider a scenario where one process is holding a read lock that
|
|
|
+** it is trying to promote to a reserved lock and
|
|
|
+** a second process is holding a reserved lock that it is trying
|
|
|
+** to promote to an exclusive lock. The first process cannot proceed
|
|
|
+** because it is blocked by the second and the second process cannot
|
|
|
+** proceed because it is blocked by the first. If both processes
|
|
|
+** invoke the busy handlers, neither will make any progress. Therefore,
|
|
|
+** SQLite returns [SQLITE_BUSY] for the first process, hoping that this
|
|
|
+** will induce the first process to release its read lock and allow
|
|
|
+** the second process to proceed.
|
|
|
+**
|
|
|
+** ^The default busy callback is NULL.
|
|
|
+**
|
|
|
+** ^(There can only be a single busy handler defined for each
|
|
|
+** [database connection]. Setting a new busy handler clears any
|
|
|
+** previously set handler.)^ ^Note that calling [sqlite3_busy_timeout()]
|
|
|
+** or evaluating [PRAGMA busy_timeout=N] will change the
|
|
|
+** busy handler and thus clear any previously set busy handler.
|
|
|
+**
|
|
|
+** The busy callback should not take any actions which modify the
|
|
|
+** database connection that invoked the busy handler. In other words,
|
|
|
+** the busy handler is not reentrant. Any such actions
|
|
|
+** result in undefined behavior.
|
|
|
+**
|
|
|
+** A busy handler must not close the database connection
|
|
|
+** or [prepared statement] that invoked the busy handler.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_busy_handler(sqlite3*,int(*)(void*,int),void*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Set A Busy Timeout
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^This routine sets a [sqlite3_busy_handler | busy handler] that sleeps
|
|
|
+** for a specified amount of time when a table is locked. ^The handler
|
|
|
+** will sleep multiple times until at least "ms" milliseconds of sleeping
|
|
|
+** have accumulated. ^After at least "ms" milliseconds of sleeping,
|
|
|
+** the handler returns 0 which causes [sqlite3_step()] to return
|
|
|
+** [SQLITE_BUSY].
|
|
|
+**
|
|
|
+** ^Calling this routine with an argument less than or equal to zero
|
|
|
+** turns off all busy handlers.
|
|
|
+**
|
|
|
+** ^(There can only be a single busy handler for a particular
|
|
|
+** [database connection] at any given moment. If another busy handler
|
|
|
+** was defined (using [sqlite3_busy_handler()]) prior to calling
|
|
|
+** this routine, that other busy handler is cleared.)^
|
|
|
+**
|
|
|
+** See also: [PRAGMA busy_timeout]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_busy_timeout(sqlite3*, int ms);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Convenience Routines For Running Queries
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** This is a legacy interface that is preserved for backwards compatibility.
|
|
|
+** Use of this interface is not recommended.
|
|
|
+**
|
|
|
+** Definition: A <b>result table</b> is memory data structure created by the
|
|
|
+** [sqlite3_get_table()] interface. A result table records the
|
|
|
+** complete query results from one or more queries.
|
|
|
+**
|
|
|
+** The table conceptually has a number of rows and columns. But
|
|
|
+** these numbers are not part of the result table itself. These
|
|
|
+** numbers are obtained separately. Let N be the number of rows
|
|
|
+** and M be the number of columns.
|
|
|
+**
|
|
|
+** A result table is an array of pointers to zero-terminated UTF-8 strings.
|
|
|
+** There are (N+1)*M elements in the array. The first M pointers point
|
|
|
+** to zero-terminated strings that contain the names of the columns.
|
|
|
+** The remaining entries all point to query results. NULL values result
|
|
|
+** in NULL pointers. All other values are in their UTF-8 zero-terminated
|
|
|
+** string representation as returned by [sqlite3_column_text()].
|
|
|
+**
|
|
|
+** A result table might consist of one or more memory allocations.
|
|
|
+** It is not safe to pass a result table directly to [sqlite3_free()].
|
|
|
+** A result table should be deallocated using [sqlite3_free_table()].
|
|
|
+**
|
|
|
+** ^(As an example of the result table format, suppose a query result
|
|
|
+** is as follows:
|
|
|
+**
|
|
|
+** <blockquote><pre>
|
|
|
+** Name | Age
|
|
|
+** -----------------------
|
|
|
+** Alice | 43
|
|
|
+** Bob | 28
|
|
|
+** Cindy | 21
|
|
|
+** </pre></blockquote>
|
|
|
+**
|
|
|
+** There are two columns (M==2) and three rows (N==3). Thus the
|
|
|
+** result table has 8 entries. Suppose the result table is stored
|
|
|
+** in an array named azResult. Then azResult holds this content:
|
|
|
+**
|
|
|
+** <blockquote><pre>
|
|
|
+** azResult[0] = "Name";
|
|
|
+** azResult[1] = "Age";
|
|
|
+** azResult[2] = "Alice";
|
|
|
+** azResult[3] = "43";
|
|
|
+** azResult[4] = "Bob";
|
|
|
+** azResult[5] = "28";
|
|
|
+** azResult[6] = "Cindy";
|
|
|
+** azResult[7] = "21";
|
|
|
+** </pre></blockquote>)^
|
|
|
+**
|
|
|
+** ^The sqlite3_get_table() function evaluates one or more
|
|
|
+** semicolon-separated SQL statements in the zero-terminated UTF-8
|
|
|
+** string of its 2nd parameter and returns a result table to the
|
|
|
+** pointer given in its 3rd parameter.
|
|
|
+**
|
|
|
+** After the application has finished with the result from sqlite3_get_table(),
|
|
|
+** it must pass the result table pointer to sqlite3_free_table() in order to
|
|
|
+** release the memory that was malloced. Because of the way the
|
|
|
+** [sqlite3_malloc()] happens within sqlite3_get_table(), the calling
|
|
|
+** function must not try to call [sqlite3_free()] directly. Only
|
|
|
+** [sqlite3_free_table()] is able to release the memory properly and safely.
|
|
|
+**
|
|
|
+** The sqlite3_get_table() interface is implemented as a wrapper around
|
|
|
+** [sqlite3_exec()]. The sqlite3_get_table() routine does not have access
|
|
|
+** to any internal data structures of SQLite. It uses only the public
|
|
|
+** interface defined here. As a consequence, errors that occur in the
|
|
|
+** wrapper layer outside of the internal [sqlite3_exec()] call are not
|
|
|
+** reflected in subsequent calls to [sqlite3_errcode()] or
|
|
|
+** [sqlite3_errmsg()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_get_table(
|
|
|
+ sqlite3 *db, /* An open database */
|
|
|
+ const char *zSql, /* SQL to be evaluated */
|
|
|
+ char ***pazResult, /* Results of the query */
|
|
|
+ int *pnRow, /* Number of result rows written here */
|
|
|
+ int *pnColumn, /* Number of result columns written here */
|
|
|
+ char **pzErrmsg /* Error msg written here */
|
|
|
+);
|
|
|
+SQLITE_API void sqlite3_free_table(char **result);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Formatted String Printing Functions
|
|
|
+**
|
|
|
+** These routines are work-alikes of the "printf()" family of functions
|
|
|
+** from the standard C library.
|
|
|
+** These routines understand most of the common formatting options from
|
|
|
+** the standard library printf()
|
|
|
+** plus some additional non-standard formats ([%q], [%Q], [%w], and [%z]).
|
|
|
+** See the [built-in printf()] documentation for details.
|
|
|
+**
|
|
|
+** ^The sqlite3_mprintf() and sqlite3_vmprintf() routines write their
|
|
|
+** results into memory obtained from [sqlite3_malloc64()].
|
|
|
+** The strings returned by these two routines should be
|
|
|
+** released by [sqlite3_free()]. ^Both routines return a
|
|
|
+** NULL pointer if [sqlite3_malloc64()] is unable to allocate enough
|
|
|
+** memory to hold the resulting string.
|
|
|
+**
|
|
|
+** ^(The sqlite3_snprintf() routine is similar to "snprintf()" from
|
|
|
+** the standard C library. The result is written into the
|
|
|
+** buffer supplied as the second parameter whose size is given by
|
|
|
+** the first parameter. Note that the order of the
|
|
|
+** first two parameters is reversed from snprintf().)^ This is an
|
|
|
+** historical accident that cannot be fixed without breaking
|
|
|
+** backwards compatibility. ^(Note also that sqlite3_snprintf()
|
|
|
+** returns a pointer to its buffer instead of the number of
|
|
|
+** characters actually written into the buffer.)^ We admit that
|
|
|
+** the number of characters written would be a more useful return
|
|
|
+** value but we cannot change the implementation of sqlite3_snprintf()
|
|
|
+** now without breaking compatibility.
|
|
|
+**
|
|
|
+** ^As long as the buffer size is greater than zero, sqlite3_snprintf()
|
|
|
+** guarantees that the buffer is always zero-terminated. ^The first
|
|
|
+** parameter "n" is the total size of the buffer, including space for
|
|
|
+** the zero terminator. So the longest string that can be completely
|
|
|
+** written will be n-1 characters.
|
|
|
+**
|
|
|
+** ^The sqlite3_vsnprintf() routine is a varargs version of sqlite3_snprintf().
|
|
|
+**
|
|
|
+** See also: [built-in printf()], [printf() SQL function]
|
|
|
+*/
|
|
|
+SQLITE_API char *sqlite3_mprintf(const char*,...);
|
|
|
+SQLITE_API char *sqlite3_vmprintf(const char*, va_list);
|
|
|
+SQLITE_API char *sqlite3_snprintf(int,char*,const char*, ...);
|
|
|
+SQLITE_API char *sqlite3_vsnprintf(int,char*,const char*, va_list);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Memory Allocation Subsystem
|
|
|
+**
|
|
|
+** The SQLite core uses these three routines for all of its own
|
|
|
+** internal memory allocation needs. "Core" in the previous sentence
|
|
|
+** does not include operating-system specific [VFS] implementation. The
|
|
|
+** Windows VFS uses native malloc() and free() for some operations.
|
|
|
+**
|
|
|
+** ^The sqlite3_malloc() routine returns a pointer to a block
|
|
|
+** of memory at least N bytes in length, where N is the parameter.
|
|
|
+** ^If sqlite3_malloc() is unable to obtain sufficient free
|
|
|
+** memory, it returns a NULL pointer. ^If the parameter N to
|
|
|
+** sqlite3_malloc() is zero or negative then sqlite3_malloc() returns
|
|
|
+** a NULL pointer.
|
|
|
+**
|
|
|
+** ^The sqlite3_malloc64(N) routine works just like
|
|
|
+** sqlite3_malloc(N) except that N is an unsigned 64-bit integer instead
|
|
|
+** of a signed 32-bit integer.
|
|
|
+**
|
|
|
+** ^Calling sqlite3_free() with a pointer previously returned
|
|
|
+** by sqlite3_malloc() or sqlite3_realloc() releases that memory so
|
|
|
+** that it might be reused. ^The sqlite3_free() routine is
|
|
|
+** a no-op if is called with a NULL pointer. Passing a NULL pointer
|
|
|
+** to sqlite3_free() is harmless. After being freed, memory
|
|
|
+** should neither be read nor written. Even reading previously freed
|
|
|
+** memory might result in a segmentation fault or other severe error.
|
|
|
+** Memory corruption, a segmentation fault, or other severe error
|
|
|
+** might result if sqlite3_free() is called with a non-NULL pointer that
|
|
|
+** was not obtained from sqlite3_malloc() or sqlite3_realloc().
|
|
|
+**
|
|
|
+** ^The sqlite3_realloc(X,N) interface attempts to resize a
|
|
|
+** prior memory allocation X to be at least N bytes.
|
|
|
+** ^If the X parameter to sqlite3_realloc(X,N)
|
|
|
+** is a NULL pointer then its behavior is identical to calling
|
|
|
+** sqlite3_malloc(N).
|
|
|
+** ^If the N parameter to sqlite3_realloc(X,N) is zero or
|
|
|
+** negative then the behavior is exactly the same as calling
|
|
|
+** sqlite3_free(X).
|
|
|
+** ^sqlite3_realloc(X,N) returns a pointer to a memory allocation
|
|
|
+** of at least N bytes in size or NULL if insufficient memory is available.
|
|
|
+** ^If M is the size of the prior allocation, then min(N,M) bytes
|
|
|
+** of the prior allocation are copied into the beginning of buffer returned
|
|
|
+** by sqlite3_realloc(X,N) and the prior allocation is freed.
|
|
|
+** ^If sqlite3_realloc(X,N) returns NULL and N is positive, then the
|
|
|
+** prior allocation is not freed.
|
|
|
+**
|
|
|
+** ^The sqlite3_realloc64(X,N) interfaces works the same as
|
|
|
+** sqlite3_realloc(X,N) except that N is a 64-bit unsigned integer instead
|
|
|
+** of a 32-bit signed integer.
|
|
|
+**
|
|
|
+** ^If X is a memory allocation previously obtained from sqlite3_malloc(),
|
|
|
+** sqlite3_malloc64(), sqlite3_realloc(), or sqlite3_realloc64(), then
|
|
|
+** sqlite3_msize(X) returns the size of that memory allocation in bytes.
|
|
|
+** ^The value returned by sqlite3_msize(X) might be larger than the number
|
|
|
+** of bytes requested when X was allocated. ^If X is a NULL pointer then
|
|
|
+** sqlite3_msize(X) returns zero. If X points to something that is not
|
|
|
+** the beginning of memory allocation, or if it points to a formerly
|
|
|
+** valid memory allocation that has now been freed, then the behavior
|
|
|
+** of sqlite3_msize(X) is undefined and possibly harmful.
|
|
|
+**
|
|
|
+** ^The memory returned by sqlite3_malloc(), sqlite3_realloc(),
|
|
|
+** sqlite3_malloc64(), and sqlite3_realloc64()
|
|
|
+** is always aligned to at least an 8 byte boundary, or to a
|
|
|
+** 4 byte boundary if the [SQLITE_4_BYTE_ALIGNED_MALLOC] compile-time
|
|
|
+** option is used.
|
|
|
+**
|
|
|
+** The pointer arguments to [sqlite3_free()] and [sqlite3_realloc()]
|
|
|
+** must be either NULL or else pointers obtained from a prior
|
|
|
+** invocation of [sqlite3_malloc()] or [sqlite3_realloc()] that have
|
|
|
+** not yet been released.
|
|
|
+**
|
|
|
+** The application must not read or write any part of
|
|
|
+** a block of memory after it has been released using
|
|
|
+** [sqlite3_free()] or [sqlite3_realloc()].
|
|
|
+*/
|
|
|
+SQLITE_API void *sqlite3_malloc(int);
|
|
|
+SQLITE_API void *sqlite3_malloc64(sqlite3_uint64);
|
|
|
+SQLITE_API void *sqlite3_realloc(void*, int);
|
|
|
+SQLITE_API void *sqlite3_realloc64(void*, sqlite3_uint64);
|
|
|
+SQLITE_API void sqlite3_free(void*);
|
|
|
+SQLITE_API sqlite3_uint64 sqlite3_msize(void*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Memory Allocator Statistics
|
|
|
+**
|
|
|
+** SQLite provides these two interfaces for reporting on the status
|
|
|
+** of the [sqlite3_malloc()], [sqlite3_free()], and [sqlite3_realloc()]
|
|
|
+** routines, which form the built-in memory allocation subsystem.
|
|
|
+**
|
|
|
+** ^The [sqlite3_memory_used()] routine returns the number of bytes
|
|
|
+** of memory currently outstanding (malloced but not freed).
|
|
|
+** ^The [sqlite3_memory_highwater()] routine returns the maximum
|
|
|
+** value of [sqlite3_memory_used()] since the high-water mark
|
|
|
+** was last reset. ^The values returned by [sqlite3_memory_used()] and
|
|
|
+** [sqlite3_memory_highwater()] include any overhead
|
|
|
+** added by SQLite in its implementation of [sqlite3_malloc()],
|
|
|
+** but not overhead added by the any underlying system library
|
|
|
+** routines that [sqlite3_malloc()] may call.
|
|
|
+**
|
|
|
+** ^The memory high-water mark is reset to the current value of
|
|
|
+** [sqlite3_memory_used()] if and only if the parameter to
|
|
|
+** [sqlite3_memory_highwater()] is true. ^The value returned
|
|
|
+** by [sqlite3_memory_highwater(1)] is the high-water mark
|
|
|
+** prior to the reset.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_int64 sqlite3_memory_used(void);
|
|
|
+SQLITE_API sqlite3_int64 sqlite3_memory_highwater(int resetFlag);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Pseudo-Random Number Generator
|
|
|
+**
|
|
|
+** SQLite contains a high-quality pseudo-random number generator (PRNG) used to
|
|
|
+** select random [ROWID | ROWIDs] when inserting new records into a table that
|
|
|
+** already uses the largest possible [ROWID]. The PRNG is also used for
|
|
|
+** the built-in random() and randomblob() SQL functions. This interface allows
|
|
|
+** applications to access the same PRNG for other purposes.
|
|
|
+**
|
|
|
+** ^A call to this routine stores N bytes of randomness into buffer P.
|
|
|
+** ^The P parameter can be a NULL pointer.
|
|
|
+**
|
|
|
+** ^If this routine has not been previously called or if the previous
|
|
|
+** call had N less than one or a NULL pointer for P, then the PRNG is
|
|
|
+** seeded using randomness obtained from the xRandomness method of
|
|
|
+** the default [sqlite3_vfs] object.
|
|
|
+** ^If the previous call to this routine had an N of 1 or more and a
|
|
|
+** non-NULL P then the pseudo-randomness is generated
|
|
|
+** internally and without recourse to the [sqlite3_vfs] xRandomness
|
|
|
+** method.
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_randomness(int N, void *P);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Compile-Time Authorization Callbacks
|
|
|
+** METHOD: sqlite3
|
|
|
+** KEYWORDS: {authorizer callback}
|
|
|
+**
|
|
|
+** ^This routine registers an authorizer callback with a particular
|
|
|
+** [database connection], supplied in the first argument.
|
|
|
+** ^The authorizer callback is invoked as SQL statements are being compiled
|
|
|
+** by [sqlite3_prepare()] or its variants [sqlite3_prepare_v2()],
|
|
|
+** [sqlite3_prepare_v3()], [sqlite3_prepare16()], [sqlite3_prepare16_v2()],
|
|
|
+** and [sqlite3_prepare16_v3()]. ^At various
|
|
|
+** points during the compilation process, as logic is being created
|
|
|
+** to perform various actions, the authorizer callback is invoked to
|
|
|
+** see if those actions are allowed. ^The authorizer callback should
|
|
|
+** return [SQLITE_OK] to allow the action, [SQLITE_IGNORE] to disallow the
|
|
|
+** specific action but allow the SQL statement to continue to be
|
|
|
+** compiled, or [SQLITE_DENY] to cause the entire SQL statement to be
|
|
|
+** rejected with an error. ^If the authorizer callback returns
|
|
|
+** any value other than [SQLITE_IGNORE], [SQLITE_OK], or [SQLITE_DENY]
|
|
|
+** then the [sqlite3_prepare_v2()] or equivalent call that triggered
|
|
|
+** the authorizer will fail with an error message.
|
|
|
+**
|
|
|
+** When the callback returns [SQLITE_OK], that means the operation
|
|
|
+** requested is ok. ^When the callback returns [SQLITE_DENY], the
|
|
|
+** [sqlite3_prepare_v2()] or equivalent call that triggered the
|
|
|
+** authorizer will fail with an error message explaining that
|
|
|
+** access is denied.
|
|
|
+**
|
|
|
+** ^The first parameter to the authorizer callback is a copy of the third
|
|
|
+** parameter to the sqlite3_set_authorizer() interface. ^The second parameter
|
|
|
+** to the callback is an integer [SQLITE_COPY | action code] that specifies
|
|
|
+** the particular action to be authorized. ^The third through sixth parameters
|
|
|
+** to the callback are either NULL pointers or zero-terminated strings
|
|
|
+** that contain additional details about the action to be authorized.
|
|
|
+** Applications must always be prepared to encounter a NULL pointer in any
|
|
|
+** of the third through the sixth parameters of the authorization callback.
|
|
|
+**
|
|
|
+** ^If the action code is [SQLITE_READ]
|
|
|
+** and the callback returns [SQLITE_IGNORE] then the
|
|
|
+** [prepared statement] statement is constructed to substitute
|
|
|
+** a NULL value in place of the table column that would have
|
|
|
+** been read if [SQLITE_OK] had been returned. The [SQLITE_IGNORE]
|
|
|
+** return can be used to deny an untrusted user access to individual
|
|
|
+** columns of a table.
|
|
|
+** ^When a table is referenced by a [SELECT] but no column values are
|
|
|
+** extracted from that table (for example in a query like
|
|
|
+** "SELECT count(*) FROM tab") then the [SQLITE_READ] authorizer callback
|
|
|
+** is invoked once for that table with a column name that is an empty string.
|
|
|
+** ^If the action code is [SQLITE_DELETE] and the callback returns
|
|
|
+** [SQLITE_IGNORE] then the [DELETE] operation proceeds but the
|
|
|
+** [truncate optimization] is disabled and all rows are deleted individually.
|
|
|
+**
|
|
|
+** An authorizer is used when [sqlite3_prepare | preparing]
|
|
|
+** SQL statements from an untrusted source, to ensure that the SQL statements
|
|
|
+** do not try to access data they are not allowed to see, or that they do not
|
|
|
+** try to execute malicious statements that damage the database. For
|
|
|
+** example, an application may allow a user to enter arbitrary
|
|
|
+** SQL queries for evaluation by a database. But the application does
|
|
|
+** not want the user to be able to make arbitrary changes to the
|
|
|
+** database. An authorizer could then be put in place while the
|
|
|
+** user-entered SQL is being [sqlite3_prepare | prepared] that
|
|
|
+** disallows everything except [SELECT] statements.
|
|
|
+**
|
|
|
+** Applications that need to process SQL from untrusted sources
|
|
|
+** might also consider lowering resource limits using [sqlite3_limit()]
|
|
|
+** and limiting database size using the [max_page_count] [PRAGMA]
|
|
|
+** in addition to using an authorizer.
|
|
|
+**
|
|
|
+** ^(Only a single authorizer can be in place on a database connection
|
|
|
+** at a time. Each call to sqlite3_set_authorizer overrides the
|
|
|
+** previous call.)^ ^Disable the authorizer by installing a NULL callback.
|
|
|
+** The authorizer is disabled by default.
|
|
|
+**
|
|
|
+** The authorizer callback must not do anything that will modify
|
|
|
+** the database connection that invoked the authorizer callback.
|
|
|
+** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
|
|
|
+** database connections for the meaning of "modify" in this paragraph.
|
|
|
+**
|
|
|
+** ^When [sqlite3_prepare_v2()] is used to prepare a statement, the
|
|
|
+** statement might be re-prepared during [sqlite3_step()] due to a
|
|
|
+** schema change. Hence, the application should ensure that the
|
|
|
+** correct authorizer callback remains in place during the [sqlite3_step()].
|
|
|
+**
|
|
|
+** ^Note that the authorizer callback is invoked only during
|
|
|
+** [sqlite3_prepare()] or its variants. Authorization is not
|
|
|
+** performed during statement evaluation in [sqlite3_step()], unless
|
|
|
+** as stated in the previous paragraph, sqlite3_step() invokes
|
|
|
+** sqlite3_prepare_v2() to reprepare a statement after a schema change.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_set_authorizer(
|
|
|
+ sqlite3*,
|
|
|
+ int (*xAuth)(void*,int,const char*,const char*,const char*,const char*),
|
|
|
+ void *pUserData
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Authorizer Return Codes
|
|
|
+**
|
|
|
+** The [sqlite3_set_authorizer | authorizer callback function] must
|
|
|
+** return either [SQLITE_OK] or one of these two constants in order
|
|
|
+** to signal SQLite whether or not the action is permitted. See the
|
|
|
+** [sqlite3_set_authorizer | authorizer documentation] for additional
|
|
|
+** information.
|
|
|
+**
|
|
|
+** Note that SQLITE_IGNORE is also used as a [conflict resolution mode]
|
|
|
+** returned from the [sqlite3_vtab_on_conflict()] interface.
|
|
|
+*/
|
|
|
+#define SQLITE_DENY 1 /* Abort the SQL statement with an error */
|
|
|
+#define SQLITE_IGNORE 2 /* Don't allow access, but don't generate an error */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Authorizer Action Codes
|
|
|
+**
|
|
|
+** The [sqlite3_set_authorizer()] interface registers a callback function
|
|
|
+** that is invoked to authorize certain SQL statement actions. The
|
|
|
+** second parameter to the callback is an integer code that specifies
|
|
|
+** what action is being authorized. These are the integer action codes that
|
|
|
+** the authorizer callback may be passed.
|
|
|
+**
|
|
|
+** These action code values signify what kind of operation is to be
|
|
|
+** authorized. The 3rd and 4th parameters to the authorization
|
|
|
+** callback function will be parameters or NULL depending on which of these
|
|
|
+** codes is used as the second parameter. ^(The 5th parameter to the
|
|
|
+** authorizer callback is the name of the database ("main", "temp",
|
|
|
+** etc.) if applicable.)^ ^The 6th parameter to the authorizer callback
|
|
|
+** is the name of the inner-most trigger or view that is responsible for
|
|
|
+** the access attempt or NULL if this access attempt is directly from
|
|
|
+** top-level SQL code.
|
|
|
+*/
|
|
|
+/******************************************* 3rd ************ 4th ***********/
|
|
|
+#define SQLITE_CREATE_INDEX 1 /* Index Name Table Name */
|
|
|
+#define SQLITE_CREATE_TABLE 2 /* Table Name NULL */
|
|
|
+#define SQLITE_CREATE_TEMP_INDEX 3 /* Index Name Table Name */
|
|
|
+#define SQLITE_CREATE_TEMP_TABLE 4 /* Table Name NULL */
|
|
|
+#define SQLITE_CREATE_TEMP_TRIGGER 5 /* Trigger Name Table Name */
|
|
|
+#define SQLITE_CREATE_TEMP_VIEW 6 /* View Name NULL */
|
|
|
+#define SQLITE_CREATE_TRIGGER 7 /* Trigger Name Table Name */
|
|
|
+#define SQLITE_CREATE_VIEW 8 /* View Name NULL */
|
|
|
+#define SQLITE_DELETE 9 /* Table Name NULL */
|
|
|
+#define SQLITE_DROP_INDEX 10 /* Index Name Table Name */
|
|
|
+#define SQLITE_DROP_TABLE 11 /* Table Name NULL */
|
|
|
+#define SQLITE_DROP_TEMP_INDEX 12 /* Index Name Table Name */
|
|
|
+#define SQLITE_DROP_TEMP_TABLE 13 /* Table Name NULL */
|
|
|
+#define SQLITE_DROP_TEMP_TRIGGER 14 /* Trigger Name Table Name */
|
|
|
+#define SQLITE_DROP_TEMP_VIEW 15 /* View Name NULL */
|
|
|
+#define SQLITE_DROP_TRIGGER 16 /* Trigger Name Table Name */
|
|
|
+#define SQLITE_DROP_VIEW 17 /* View Name NULL */
|
|
|
+#define SQLITE_INSERT 18 /* Table Name NULL */
|
|
|
+#define SQLITE_PRAGMA 19 /* Pragma Name 1st arg or NULL */
|
|
|
+#define SQLITE_READ 20 /* Table Name Column Name */
|
|
|
+#define SQLITE_SELECT 21 /* NULL NULL */
|
|
|
+#define SQLITE_TRANSACTION 22 /* Operation NULL */
|
|
|
+#define SQLITE_UPDATE 23 /* Table Name Column Name */
|
|
|
+#define SQLITE_ATTACH 24 /* Filename NULL */
|
|
|
+#define SQLITE_DETACH 25 /* Database Name NULL */
|
|
|
+#define SQLITE_ALTER_TABLE 26 /* Database Name Table Name */
|
|
|
+#define SQLITE_REINDEX 27 /* Index Name NULL */
|
|
|
+#define SQLITE_ANALYZE 28 /* Table Name NULL */
|
|
|
+#define SQLITE_CREATE_VTABLE 29 /* Table Name Module Name */
|
|
|
+#define SQLITE_DROP_VTABLE 30 /* Table Name Module Name */
|
|
|
+#define SQLITE_FUNCTION 31 /* NULL Function Name */
|
|
|
+#define SQLITE_SAVEPOINT 32 /* Operation Savepoint Name */
|
|
|
+#define SQLITE_COPY 0 /* No longer used */
|
|
|
+#define SQLITE_RECURSIVE 33 /* NULL NULL */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Tracing And Profiling Functions
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** These routines are deprecated. Use the [sqlite3_trace_v2()] interface
|
|
|
+** instead of the routines described here.
|
|
|
+**
|
|
|
+** These routines register callback functions that can be used for
|
|
|
+** tracing and profiling the execution of SQL statements.
|
|
|
+**
|
|
|
+** ^The callback function registered by sqlite3_trace() is invoked at
|
|
|
+** various times when an SQL statement is being run by [sqlite3_step()].
|
|
|
+** ^The sqlite3_trace() callback is invoked with a UTF-8 rendering of the
|
|
|
+** SQL statement text as the statement first begins executing.
|
|
|
+** ^(Additional sqlite3_trace() callbacks might occur
|
|
|
+** as each triggered subprogram is entered. The callbacks for triggers
|
|
|
+** contain a UTF-8 SQL comment that identifies the trigger.)^
|
|
|
+**
|
|
|
+** The [SQLITE_TRACE_SIZE_LIMIT] compile-time option can be used to limit
|
|
|
+** the length of [bound parameter] expansion in the output of sqlite3_trace().
|
|
|
+**
|
|
|
+** ^The callback function registered by sqlite3_profile() is invoked
|
|
|
+** as each SQL statement finishes. ^The profile callback contains
|
|
|
+** the original statement text and an estimate of wall-clock time
|
|
|
+** of how long that statement took to run. ^The profile callback
|
|
|
+** time is in units of nanoseconds, however the current implementation
|
|
|
+** is only capable of millisecond resolution so the six least significant
|
|
|
+** digits in the time are meaningless. Future versions of SQLite
|
|
|
+** might provide greater resolution on the profiler callback. Invoking
|
|
|
+** either [sqlite3_trace()] or [sqlite3_trace_v2()] will cancel the
|
|
|
+** profile callback.
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_DEPRECATED void *sqlite3_trace(sqlite3*,
|
|
|
+ void(*xTrace)(void*,const char*), void*);
|
|
|
+SQLITE_API SQLITE_DEPRECATED void *sqlite3_profile(sqlite3*,
|
|
|
+ void(*xProfile)(void*,const char*,sqlite3_uint64), void*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: SQL Trace Event Codes
|
|
|
+** KEYWORDS: SQLITE_TRACE
|
|
|
+**
|
|
|
+** These constants identify classes of events that can be monitored
|
|
|
+** using the [sqlite3_trace_v2()] tracing logic. The M argument
|
|
|
+** to [sqlite3_trace_v2(D,M,X,P)] is an OR-ed combination of one or more of
|
|
|
+** the following constants. ^The first argument to the trace callback
|
|
|
+** is one of the following constants.
|
|
|
+**
|
|
|
+** New tracing constants may be added in future releases.
|
|
|
+**
|
|
|
+** ^A trace callback has four arguments: xCallback(T,C,P,X).
|
|
|
+** ^The T argument is one of the integer type codes above.
|
|
|
+** ^The C argument is a copy of the context pointer passed in as the
|
|
|
+** fourth argument to [sqlite3_trace_v2()].
|
|
|
+** The P and X arguments are pointers whose meanings depend on T.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_TRACE_STMT]] <dt>SQLITE_TRACE_STMT</dt>
|
|
|
+** <dd>^An SQLITE_TRACE_STMT callback is invoked when a prepared statement
|
|
|
+** first begins running and possibly at other times during the
|
|
|
+** execution of the prepared statement, such as at the start of each
|
|
|
+** trigger subprogram. ^The P argument is a pointer to the
|
|
|
+** [prepared statement]. ^The X argument is a pointer to a string which
|
|
|
+** is the unexpanded SQL text of the prepared statement or an SQL comment
|
|
|
+** that indicates the invocation of a trigger. ^The callback can compute
|
|
|
+** the same text that would have been returned by the legacy [sqlite3_trace()]
|
|
|
+** interface by using the X argument when X begins with "--" and invoking
|
|
|
+** [sqlite3_expanded_sql(P)] otherwise.
|
|
|
+**
|
|
|
+** [[SQLITE_TRACE_PROFILE]] <dt>SQLITE_TRACE_PROFILE</dt>
|
|
|
+** <dd>^An SQLITE_TRACE_PROFILE callback provides approximately the same
|
|
|
+** information as is provided by the [sqlite3_profile()] callback.
|
|
|
+** ^The P argument is a pointer to the [prepared statement] and the
|
|
|
+** X argument points to a 64-bit integer which is the estimated of
|
|
|
+** the number of nanosecond that the prepared statement took to run.
|
|
|
+** ^The SQLITE_TRACE_PROFILE callback is invoked when the statement finishes.
|
|
|
+**
|
|
|
+** [[SQLITE_TRACE_ROW]] <dt>SQLITE_TRACE_ROW</dt>
|
|
|
+** <dd>^An SQLITE_TRACE_ROW callback is invoked whenever a prepared
|
|
|
+** statement generates a single row of result.
|
|
|
+** ^The P argument is a pointer to the [prepared statement] and the
|
|
|
+** X argument is unused.
|
|
|
+**
|
|
|
+** [[SQLITE_TRACE_CLOSE]] <dt>SQLITE_TRACE_CLOSE</dt>
|
|
|
+** <dd>^An SQLITE_TRACE_CLOSE callback is invoked when a database
|
|
|
+** connection closes.
|
|
|
+** ^The P argument is a pointer to the [database connection] object
|
|
|
+** and the X argument is unused.
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_TRACE_STMT 0x01
|
|
|
+#define SQLITE_TRACE_PROFILE 0x02
|
|
|
+#define SQLITE_TRACE_ROW 0x04
|
|
|
+#define SQLITE_TRACE_CLOSE 0x08
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: SQL Trace Hook
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_trace_v2(D,M,X,P) interface registers a trace callback
|
|
|
+** function X against [database connection] D, using property mask M
|
|
|
+** and context pointer P. ^If the X callback is
|
|
|
+** NULL or if the M mask is zero, then tracing is disabled. The
|
|
|
+** M argument should be the bitwise OR-ed combination of
|
|
|
+** zero or more [SQLITE_TRACE] constants.
|
|
|
+**
|
|
|
+** ^Each call to either sqlite3_trace() or sqlite3_trace_v2() overrides
|
|
|
+** (cancels) any prior calls to sqlite3_trace() or sqlite3_trace_v2().
|
|
|
+**
|
|
|
+** ^The X callback is invoked whenever any of the events identified by
|
|
|
+** mask M occur. ^The integer return value from the callback is currently
|
|
|
+** ignored, though this may change in future releases. Callback
|
|
|
+** implementations should return zero to ensure future compatibility.
|
|
|
+**
|
|
|
+** ^A trace callback is invoked with four arguments: callback(T,C,P,X).
|
|
|
+** ^The T argument is one of the [SQLITE_TRACE]
|
|
|
+** constants to indicate why the callback was invoked.
|
|
|
+** ^The C argument is a copy of the context pointer.
|
|
|
+** The P and X arguments are pointers whose meanings depend on T.
|
|
|
+**
|
|
|
+** The sqlite3_trace_v2() interface is intended to replace the legacy
|
|
|
+** interfaces [sqlite3_trace()] and [sqlite3_profile()], both of which
|
|
|
+** are deprecated.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_trace_v2(
|
|
|
+ sqlite3*,
|
|
|
+ unsigned uMask,
|
|
|
+ int(*xCallback)(unsigned,void*,void*,void*),
|
|
|
+ void *pCtx
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Query Progress Callbacks
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_progress_handler(D,N,X,P) interface causes the callback
|
|
|
+** function X to be invoked periodically during long running calls to
|
|
|
+** [sqlite3_exec()], [sqlite3_step()] and [sqlite3_get_table()] for
|
|
|
+** database connection D. An example use for this
|
|
|
+** interface is to keep a GUI updated during a large query.
|
|
|
+**
|
|
|
+** ^The parameter P is passed through as the only parameter to the
|
|
|
+** callback function X. ^The parameter N is the approximate number of
|
|
|
+** [virtual machine instructions] that are evaluated between successive
|
|
|
+** invocations of the callback X. ^If N is less than one then the progress
|
|
|
+** handler is disabled.
|
|
|
+**
|
|
|
+** ^Only a single progress handler may be defined at one time per
|
|
|
+** [database connection]; setting a new progress handler cancels the
|
|
|
+** old one. ^Setting parameter X to NULL disables the progress handler.
|
|
|
+** ^The progress handler is also disabled by setting N to a value less
|
|
|
+** than 1.
|
|
|
+**
|
|
|
+** ^If the progress callback returns non-zero, the operation is
|
|
|
+** interrupted. This feature can be used to implement a
|
|
|
+** "Cancel" button on a GUI progress dialog box.
|
|
|
+**
|
|
|
+** The progress handler callback must not do anything that will modify
|
|
|
+** the database connection that invoked the progress handler.
|
|
|
+** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
|
|
|
+** database connections for the meaning of "modify" in this paragraph.
|
|
|
+**
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_progress_handler(sqlite3*, int, int(*)(void*), void*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Opening A New Database Connection
|
|
|
+** CONSTRUCTOR: sqlite3
|
|
|
+**
|
|
|
+** ^These routines open an SQLite database file as specified by the
|
|
|
+** filename argument. ^The filename argument is interpreted as UTF-8 for
|
|
|
+** sqlite3_open() and sqlite3_open_v2() and as UTF-16 in the native byte
|
|
|
+** order for sqlite3_open16(). ^(A [database connection] handle is usually
|
|
|
+** returned in *ppDb, even if an error occurs. The only exception is that
|
|
|
+** if SQLite is unable to allocate memory to hold the [sqlite3] object,
|
|
|
+** a NULL will be written into *ppDb instead of a pointer to the [sqlite3]
|
|
|
+** object.)^ ^(If the database is opened (and/or created) successfully, then
|
|
|
+** [SQLITE_OK] is returned. Otherwise an [error code] is returned.)^ ^The
|
|
|
+** [sqlite3_errmsg()] or [sqlite3_errmsg16()] routines can be used to obtain
|
|
|
+** an English language description of the error following a failure of any
|
|
|
+** of the sqlite3_open() routines.
|
|
|
+**
|
|
|
+** ^The default encoding will be UTF-8 for databases created using
|
|
|
+** sqlite3_open() or sqlite3_open_v2(). ^The default encoding for databases
|
|
|
+** created using sqlite3_open16() will be UTF-16 in the native byte order.
|
|
|
+**
|
|
|
+** Whether or not an error occurs when it is opened, resources
|
|
|
+** associated with the [database connection] handle should be released by
|
|
|
+** passing it to [sqlite3_close()] when it is no longer required.
|
|
|
+**
|
|
|
+** The sqlite3_open_v2() interface works like sqlite3_open()
|
|
|
+** except that it accepts two additional parameters for additional control
|
|
|
+** over the new database connection. ^(The flags parameter to
|
|
|
+** sqlite3_open_v2() must include, at a minimum, one of the following
|
|
|
+** three flag combinations:)^
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** ^(<dt>[SQLITE_OPEN_READONLY]</dt>
|
|
|
+** <dd>The database is opened in read-only mode. If the database does not
|
|
|
+** already exist, an error is returned.</dd>)^
|
|
|
+**
|
|
|
+** ^(<dt>[SQLITE_OPEN_READWRITE]</dt>
|
|
|
+** <dd>The database is opened for reading and writing if possible, or reading
|
|
|
+** only if the file is write protected by the operating system. In either
|
|
|
+** case the database must already exist, otherwise an error is returned.</dd>)^
|
|
|
+**
|
|
|
+** ^(<dt>[SQLITE_OPEN_READWRITE] | [SQLITE_OPEN_CREATE]</dt>
|
|
|
+** <dd>The database is opened for reading and writing, and is created if
|
|
|
+** it does not already exist. This is the behavior that is always used for
|
|
|
+** sqlite3_open() and sqlite3_open16().</dd>)^
|
|
|
+** </dl>
|
|
|
+**
|
|
|
+** In addition to the required flags, the following optional flags are
|
|
|
+** also supported:
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** ^(<dt>[SQLITE_OPEN_URI]</dt>
|
|
|
+** <dd>The filename can be interpreted as a URI if this flag is set.</dd>)^
|
|
|
+**
|
|
|
+** ^(<dt>[SQLITE_OPEN_MEMORY]</dt>
|
|
|
+** <dd>The database will be opened as an in-memory database. The database
|
|
|
+** is named by the "filename" argument for the purposes of cache-sharing,
|
|
|
+** if shared cache mode is enabled, but the "filename" is otherwise ignored.
|
|
|
+** </dd>)^
|
|
|
+**
|
|
|
+** ^(<dt>[SQLITE_OPEN_NOMUTEX]</dt>
|
|
|
+** <dd>The new database connection will use the "multi-thread"
|
|
|
+** [threading mode].)^ This means that separate threads are allowed
|
|
|
+** to use SQLite at the same time, as long as each thread is using
|
|
|
+** a different [database connection].
|
|
|
+**
|
|
|
+** ^(<dt>[SQLITE_OPEN_FULLMUTEX]</dt>
|
|
|
+** <dd>The new database connection will use the "serialized"
|
|
|
+** [threading mode].)^ This means the multiple threads can safely
|
|
|
+** attempt to use the same database connection at the same time.
|
|
|
+** (Mutexes will block any actual concurrency, but in this mode
|
|
|
+** there is no harm in trying.)
|
|
|
+**
|
|
|
+** ^(<dt>[SQLITE_OPEN_SHAREDCACHE]</dt>
|
|
|
+** <dd>The database is opened [shared cache] enabled, overriding
|
|
|
+** the default shared cache setting provided by
|
|
|
+** [sqlite3_enable_shared_cache()].)^
|
|
|
+**
|
|
|
+** ^(<dt>[SQLITE_OPEN_PRIVATECACHE]</dt>
|
|
|
+** <dd>The database is opened [shared cache] disabled, overriding
|
|
|
+** the default shared cache setting provided by
|
|
|
+** [sqlite3_enable_shared_cache()].)^
|
|
|
+**
|
|
|
+** [[OPEN_EXRESCODE]] ^(<dt>[SQLITE_OPEN_EXRESCODE]</dt>
|
|
|
+** <dd>The database connection comes up in "extended result code mode".
|
|
|
+** In other words, the database behaves has if
|
|
|
+** [sqlite3_extended_result_codes(db,1)] where called on the database
|
|
|
+** connection as soon as the connection is created. In addition to setting
|
|
|
+** the extended result code mode, this flag also causes [sqlite3_open_v2()]
|
|
|
+** to return an extended result code.</dd>
|
|
|
+**
|
|
|
+** [[OPEN_NOFOLLOW]] ^(<dt>[SQLITE_OPEN_NOFOLLOW]</dt>
|
|
|
+** <dd>The database filename is not allowed to be a symbolic link</dd>
|
|
|
+** </dl>)^
|
|
|
+**
|
|
|
+** If the 3rd parameter to sqlite3_open_v2() is not one of the
|
|
|
+** required combinations shown above optionally combined with other
|
|
|
+** [SQLITE_OPEN_READONLY | SQLITE_OPEN_* bits]
|
|
|
+** then the behavior is undefined. Historic versions of SQLite
|
|
|
+** have silently ignored surplus bits in the flags parameter to
|
|
|
+** sqlite3_open_v2(), however that behavior might not be carried through
|
|
|
+** into future versions of SQLite and so applications should not rely
|
|
|
+** upon it. Note in particular that the SQLITE_OPEN_EXCLUSIVE flag is a no-op
|
|
|
+** for sqlite3_open_v2(). The SQLITE_OPEN_EXCLUSIVE does *not* cause
|
|
|
+** the open to fail if the database already exists. The SQLITE_OPEN_EXCLUSIVE
|
|
|
+** flag is intended for use by the [sqlite3_vfs|VFS interface] only, and not
|
|
|
+** by sqlite3_open_v2().
|
|
|
+**
|
|
|
+** ^The fourth parameter to sqlite3_open_v2() is the name of the
|
|
|
+** [sqlite3_vfs] object that defines the operating system interface that
|
|
|
+** the new database connection should use. ^If the fourth parameter is
|
|
|
+** a NULL pointer then the default [sqlite3_vfs] object is used.
|
|
|
+**
|
|
|
+** ^If the filename is ":memory:", then a private, temporary in-memory database
|
|
|
+** is created for the connection. ^This in-memory database will vanish when
|
|
|
+** the database connection is closed. Future versions of SQLite might
|
|
|
+** make use of additional special filenames that begin with the ":" character.
|
|
|
+** It is recommended that when a database filename actually does begin with
|
|
|
+** a ":" character you should prefix the filename with a pathname such as
|
|
|
+** "./" to avoid ambiguity.
|
|
|
+**
|
|
|
+** ^If the filename is an empty string, then a private, temporary
|
|
|
+** on-disk database will be created. ^This private database will be
|
|
|
+** automatically deleted as soon as the database connection is closed.
|
|
|
+**
|
|
|
+** [[URI filenames in sqlite3_open()]] <h3>URI Filenames</h3>
|
|
|
+**
|
|
|
+** ^If [URI filename] interpretation is enabled, and the filename argument
|
|
|
+** begins with "file:", then the filename is interpreted as a URI. ^URI
|
|
|
+** filename interpretation is enabled if the [SQLITE_OPEN_URI] flag is
|
|
|
+** set in the third argument to sqlite3_open_v2(), or if it has
|
|
|
+** been enabled globally using the [SQLITE_CONFIG_URI] option with the
|
|
|
+** [sqlite3_config()] method or by the [SQLITE_USE_URI] compile-time option.
|
|
|
+** URI filename interpretation is turned off
|
|
|
+** by default, but future releases of SQLite might enable URI filename
|
|
|
+** interpretation by default. See "[URI filenames]" for additional
|
|
|
+** information.
|
|
|
+**
|
|
|
+** URI filenames are parsed according to RFC 3986. ^If the URI contains an
|
|
|
+** authority, then it must be either an empty string or the string
|
|
|
+** "localhost". ^If the authority is not an empty string or "localhost", an
|
|
|
+** error is returned to the caller. ^The fragment component of a URI, if
|
|
|
+** present, is ignored.
|
|
|
+**
|
|
|
+** ^SQLite uses the path component of the URI as the name of the disk file
|
|
|
+** which contains the database. ^If the path begins with a '/' character,
|
|
|
+** then it is interpreted as an absolute path. ^If the path does not begin
|
|
|
+** with a '/' (meaning that the authority section is omitted from the URI)
|
|
|
+** then the path is interpreted as a relative path.
|
|
|
+** ^(On windows, the first component of an absolute path
|
|
|
+** is a drive specification (e.g. "C:").)^
|
|
|
+**
|
|
|
+** [[core URI query parameters]]
|
|
|
+** The query component of a URI may contain parameters that are interpreted
|
|
|
+** either by SQLite itself, or by a [VFS | custom VFS implementation].
|
|
|
+** SQLite and its built-in [VFSes] interpret the
|
|
|
+** following query parameters:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> <b>vfs</b>: ^The "vfs" parameter may be used to specify the name of
|
|
|
+** a VFS object that provides the operating system interface that should
|
|
|
+** be used to access the database file on disk. ^If this option is set to
|
|
|
+** an empty string the default VFS object is used. ^Specifying an unknown
|
|
|
+** VFS is an error. ^If sqlite3_open_v2() is used and the vfs option is
|
|
|
+** present, then the VFS specified by the option takes precedence over
|
|
|
+** the value passed as the fourth parameter to sqlite3_open_v2().
|
|
|
+**
|
|
|
+** <li> <b>mode</b>: ^(The mode parameter may be set to either "ro", "rw",
|
|
|
+** "rwc", or "memory". Attempting to set it to any other value is
|
|
|
+** an error)^.
|
|
|
+** ^If "ro" is specified, then the database is opened for read-only
|
|
|
+** access, just as if the [SQLITE_OPEN_READONLY] flag had been set in the
|
|
|
+** third argument to sqlite3_open_v2(). ^If the mode option is set to
|
|
|
+** "rw", then the database is opened for read-write (but not create)
|
|
|
+** access, as if SQLITE_OPEN_READWRITE (but not SQLITE_OPEN_CREATE) had
|
|
|
+** been set. ^Value "rwc" is equivalent to setting both
|
|
|
+** SQLITE_OPEN_READWRITE and SQLITE_OPEN_CREATE. ^If the mode option is
|
|
|
+** set to "memory" then a pure [in-memory database] that never reads
|
|
|
+** or writes from disk is used. ^It is an error to specify a value for
|
|
|
+** the mode parameter that is less restrictive than that specified by
|
|
|
+** the flags passed in the third parameter to sqlite3_open_v2().
|
|
|
+**
|
|
|
+** <li> <b>cache</b>: ^The cache parameter may be set to either "shared" or
|
|
|
+** "private". ^Setting it to "shared" is equivalent to setting the
|
|
|
+** SQLITE_OPEN_SHAREDCACHE bit in the flags argument passed to
|
|
|
+** sqlite3_open_v2(). ^Setting the cache parameter to "private" is
|
|
|
+** equivalent to setting the SQLITE_OPEN_PRIVATECACHE bit.
|
|
|
+** ^If sqlite3_open_v2() is used and the "cache" parameter is present in
|
|
|
+** a URI filename, its value overrides any behavior requested by setting
|
|
|
+** SQLITE_OPEN_PRIVATECACHE or SQLITE_OPEN_SHAREDCACHE flag.
|
|
|
+**
|
|
|
+** <li> <b>psow</b>: ^The psow parameter indicates whether or not the
|
|
|
+** [powersafe overwrite] property does or does not apply to the
|
|
|
+** storage media on which the database file resides.
|
|
|
+**
|
|
|
+** <li> <b>nolock</b>: ^The nolock parameter is a boolean query parameter
|
|
|
+** which if set disables file locking in rollback journal modes. This
|
|
|
+** is useful for accessing a database on a filesystem that does not
|
|
|
+** support locking. Caution: Database corruption might result if two
|
|
|
+** or more processes write to the same database and any one of those
|
|
|
+** processes uses nolock=1.
|
|
|
+**
|
|
|
+** <li> <b>immutable</b>: ^The immutable parameter is a boolean query
|
|
|
+** parameter that indicates that the database file is stored on
|
|
|
+** read-only media. ^When immutable is set, SQLite assumes that the
|
|
|
+** database file cannot be changed, even by a process with higher
|
|
|
+** privilege, and so the database is opened read-only and all locking
|
|
|
+** and change detection is disabled. Caution: Setting the immutable
|
|
|
+** property on a database file that does in fact change can result
|
|
|
+** in incorrect query results and/or [SQLITE_CORRUPT] errors.
|
|
|
+** See also: [SQLITE_IOCAP_IMMUTABLE].
|
|
|
+**
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** ^Specifying an unknown parameter in the query component of a URI is not an
|
|
|
+** error. Future versions of SQLite might understand additional query
|
|
|
+** parameters. See "[query parameters with special meaning to SQLite]" for
|
|
|
+** additional information.
|
|
|
+**
|
|
|
+** [[URI filename examples]] <h3>URI filename examples</h3>
|
|
|
+**
|
|
|
+** <table border="1" align=center cellpadding=5>
|
|
|
+** <tr><th> URI filenames <th> Results
|
|
|
+** <tr><td> file:data.db <td>
|
|
|
+** Open the file "data.db" in the current directory.
|
|
|
+** <tr><td> file:/home/fred/data.db<br>
|
|
|
+** file:///home/fred/data.db <br>
|
|
|
+** file://localhost/home/fred/data.db <br> <td>
|
|
|
+** Open the database file "/home/fred/data.db".
|
|
|
+** <tr><td> file://darkstar/home/fred/data.db <td>
|
|
|
+** An error. "darkstar" is not a recognized authority.
|
|
|
+** <tr><td style="white-space:nowrap">
|
|
|
+** file:///C:/Documents%20and%20Settings/fred/Desktop/data.db
|
|
|
+** <td> Windows only: Open the file "data.db" on fred's desktop on drive
|
|
|
+** C:. Note that the %20 escaping in this example is not strictly
|
|
|
+** necessary - space characters can be used literally
|
|
|
+** in URI filenames.
|
|
|
+** <tr><td> file:data.db?mode=ro&cache=private <td>
|
|
|
+** Open file "data.db" in the current directory for read-only access.
|
|
|
+** Regardless of whether or not shared-cache mode is enabled by
|
|
|
+** default, use a private cache.
|
|
|
+** <tr><td> file:/home/fred/data.db?vfs=unix-dotfile <td>
|
|
|
+** Open file "/home/fred/data.db". Use the special VFS "unix-dotfile"
|
|
|
+** that uses dot-files in place of posix advisory locking.
|
|
|
+** <tr><td> file:data.db?mode=readonly <td>
|
|
|
+** An error. "readonly" is not a valid option for the "mode" parameter.
|
|
|
+** Use "ro" instead: "file:data.db?mode=ro".
|
|
|
+** </table>
|
|
|
+**
|
|
|
+** ^URI hexadecimal escape sequences (%HH) are supported within the path and
|
|
|
+** query components of a URI. A hexadecimal escape sequence consists of a
|
|
|
+** percent sign - "%" - followed by exactly two hexadecimal digits
|
|
|
+** specifying an octet value. ^Before the path or query components of a
|
|
|
+** URI filename are interpreted, they are encoded using UTF-8 and all
|
|
|
+** hexadecimal escape sequences replaced by a single byte containing the
|
|
|
+** corresponding octet. If this process generates an invalid UTF-8 encoding,
|
|
|
+** the results are undefined.
|
|
|
+**
|
|
|
+** <b>Note to Windows users:</b> The encoding used for the filename argument
|
|
|
+** of sqlite3_open() and sqlite3_open_v2() must be UTF-8, not whatever
|
|
|
+** codepage is currently defined. Filenames containing international
|
|
|
+** characters must be converted to UTF-8 prior to passing them into
|
|
|
+** sqlite3_open() or sqlite3_open_v2().
|
|
|
+**
|
|
|
+** <b>Note to Windows Runtime users:</b> The temporary directory must be set
|
|
|
+** prior to calling sqlite3_open() or sqlite3_open_v2(). Otherwise, various
|
|
|
+** features that require the use of temporary files may fail.
|
|
|
+**
|
|
|
+** See also: [sqlite3_temp_directory]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_open(
|
|
|
+ const char *filename, /* Database filename (UTF-8) */
|
|
|
+ sqlite3 **ppDb /* OUT: SQLite db handle */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_open16(
|
|
|
+ const void *filename, /* Database filename (UTF-16) */
|
|
|
+ sqlite3 **ppDb /* OUT: SQLite db handle */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_open_v2(
|
|
|
+ const char *filename, /* Database filename (UTF-8) */
|
|
|
+ sqlite3 **ppDb, /* OUT: SQLite db handle */
|
|
|
+ int flags, /* Flags */
|
|
|
+ const char *zVfs /* Name of VFS module to use */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Obtain Values For URI Parameters
|
|
|
+**
|
|
|
+** These are utility routines, useful to [VFS|custom VFS implementations],
|
|
|
+** that check if a database file was a URI that contained a specific query
|
|
|
+** parameter, and if so obtains the value of that query parameter.
|
|
|
+**
|
|
|
+** The first parameter to these interfaces (hereafter referred to
|
|
|
+** as F) must be one of:
|
|
|
+** <ul>
|
|
|
+** <li> A database filename pointer created by the SQLite core and
|
|
|
+** passed into the xOpen() method of a VFS implemention, or
|
|
|
+** <li> A filename obtained from [sqlite3_db_filename()], or
|
|
|
+** <li> A new filename constructed using [sqlite3_create_filename()].
|
|
|
+** </ul>
|
|
|
+** If the F parameter is not one of the above, then the behavior is
|
|
|
+** undefined and probably undesirable. Older versions of SQLite were
|
|
|
+** more tolerant of invalid F parameters than newer versions.
|
|
|
+**
|
|
|
+** If F is a suitable filename (as described in the previous paragraph)
|
|
|
+** and if P is the name of the query parameter, then
|
|
|
+** sqlite3_uri_parameter(F,P) returns the value of the P
|
|
|
+** parameter if it exists or a NULL pointer if P does not appear as a
|
|
|
+** query parameter on F. If P is a query parameter of F and it
|
|
|
+** has no explicit value, then sqlite3_uri_parameter(F,P) returns
|
|
|
+** a pointer to an empty string.
|
|
|
+**
|
|
|
+** The sqlite3_uri_boolean(F,P,B) routine assumes that P is a boolean
|
|
|
+** parameter and returns true (1) or false (0) according to the value
|
|
|
+** of P. The sqlite3_uri_boolean(F,P,B) routine returns true (1) if the
|
|
|
+** value of query parameter P is one of "yes", "true", or "on" in any
|
|
|
+** case or if the value begins with a non-zero number. The
|
|
|
+** sqlite3_uri_boolean(F,P,B) routines returns false (0) if the value of
|
|
|
+** query parameter P is one of "no", "false", or "off" in any case or
|
|
|
+** if the value begins with a numeric zero. If P is not a query
|
|
|
+** parameter on F or if the value of P does not match any of the
|
|
|
+** above, then sqlite3_uri_boolean(F,P,B) returns (B!=0).
|
|
|
+**
|
|
|
+** The sqlite3_uri_int64(F,P,D) routine converts the value of P into a
|
|
|
+** 64-bit signed integer and returns that integer, or D if P does not
|
|
|
+** exist. If the value of P is something other than an integer, then
|
|
|
+** zero is returned.
|
|
|
+**
|
|
|
+** The sqlite3_uri_key(F,N) returns a pointer to the name (not
|
|
|
+** the value) of the N-th query parameter for filename F, or a NULL
|
|
|
+** pointer if N is less than zero or greater than the number of query
|
|
|
+** parameters minus 1. The N value is zero-based so N should be 0 to obtain
|
|
|
+** the name of the first query parameter, 1 for the second parameter, and
|
|
|
+** so forth.
|
|
|
+**
|
|
|
+** If F is a NULL pointer, then sqlite3_uri_parameter(F,P) returns NULL and
|
|
|
+** sqlite3_uri_boolean(F,P,B) returns B. If F is not a NULL pointer and
|
|
|
+** is not a database file pathname pointer that the SQLite core passed
|
|
|
+** into the xOpen VFS method, then the behavior of this routine is undefined
|
|
|
+** and probably undesirable.
|
|
|
+**
|
|
|
+** Beginning with SQLite [version 3.31.0] ([dateof:3.31.0]) the input F
|
|
|
+** parameter can also be the name of a rollback journal file or WAL file
|
|
|
+** in addition to the main database file. Prior to version 3.31.0, these
|
|
|
+** routines would only work if F was the name of the main database file.
|
|
|
+** When the F parameter is the name of the rollback journal or WAL file,
|
|
|
+** it has access to all the same query parameters as were found on the
|
|
|
+** main database file.
|
|
|
+**
|
|
|
+** See the [URI filename] documentation for additional information.
|
|
|
+*/
|
|
|
+SQLITE_API const char *sqlite3_uri_parameter(const char *zFilename, const char *zParam);
|
|
|
+SQLITE_API int sqlite3_uri_boolean(const char *zFile, const char *zParam, int bDefault);
|
|
|
+SQLITE_API sqlite3_int64 sqlite3_uri_int64(const char*, const char*, sqlite3_int64);
|
|
|
+SQLITE_API const char *sqlite3_uri_key(const char *zFilename, int N);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Translate filenames
|
|
|
+**
|
|
|
+** These routines are available to [VFS|custom VFS implementations] for
|
|
|
+** translating filenames between the main database file, the journal file,
|
|
|
+** and the WAL file.
|
|
|
+**
|
|
|
+** If F is the name of an sqlite database file, journal file, or WAL file
|
|
|
+** passed by the SQLite core into the VFS, then sqlite3_filename_database(F)
|
|
|
+** returns the name of the corresponding database file.
|
|
|
+**
|
|
|
+** If F is the name of an sqlite database file, journal file, or WAL file
|
|
|
+** passed by the SQLite core into the VFS, or if F is a database filename
|
|
|
+** obtained from [sqlite3_db_filename()], then sqlite3_filename_journal(F)
|
|
|
+** returns the name of the corresponding rollback journal file.
|
|
|
+**
|
|
|
+** If F is the name of an sqlite database file, journal file, or WAL file
|
|
|
+** that was passed by the SQLite core into the VFS, or if F is a database
|
|
|
+** filename obtained from [sqlite3_db_filename()], then
|
|
|
+** sqlite3_filename_wal(F) returns the name of the corresponding
|
|
|
+** WAL file.
|
|
|
+**
|
|
|
+** In all of the above, if F is not the name of a database, journal or WAL
|
|
|
+** filename passed into the VFS from the SQLite core and F is not the
|
|
|
+** return value from [sqlite3_db_filename()], then the result is
|
|
|
+** undefined and is likely a memory access violation.
|
|
|
+*/
|
|
|
+SQLITE_API const char *sqlite3_filename_database(const char*);
|
|
|
+SQLITE_API const char *sqlite3_filename_journal(const char*);
|
|
|
+SQLITE_API const char *sqlite3_filename_wal(const char*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Database File Corresponding To A Journal
|
|
|
+**
|
|
|
+** ^If X is the name of a rollback or WAL-mode journal file that is
|
|
|
+** passed into the xOpen method of [sqlite3_vfs], then
|
|
|
+** sqlite3_database_file_object(X) returns a pointer to the [sqlite3_file]
|
|
|
+** object that represents the main database file.
|
|
|
+**
|
|
|
+** This routine is intended for use in custom [VFS] implementations
|
|
|
+** only. It is not a general-purpose interface.
|
|
|
+** The argument sqlite3_file_object(X) must be a filename pointer that
|
|
|
+** has been passed into [sqlite3_vfs].xOpen method where the
|
|
|
+** flags parameter to xOpen contains one of the bits
|
|
|
+** [SQLITE_OPEN_MAIN_JOURNAL] or [SQLITE_OPEN_WAL]. Any other use
|
|
|
+** of this routine results in undefined and probably undesirable
|
|
|
+** behavior.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_file *sqlite3_database_file_object(const char*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Create and Destroy VFS Filenames
|
|
|
+**
|
|
|
+** These interfces are provided for use by [VFS shim] implementations and
|
|
|
+** are not useful outside of that context.
|
|
|
+**
|
|
|
+** The sqlite3_create_filename(D,J,W,N,P) allocates memory to hold a version of
|
|
|
+** database filename D with corresponding journal file J and WAL file W and
|
|
|
+** with N URI parameters key/values pairs in the array P. The result from
|
|
|
+** sqlite3_create_filename(D,J,W,N,P) is a pointer to a database filename that
|
|
|
+** is safe to pass to routines like:
|
|
|
+** <ul>
|
|
|
+** <li> [sqlite3_uri_parameter()],
|
|
|
+** <li> [sqlite3_uri_boolean()],
|
|
|
+** <li> [sqlite3_uri_int64()],
|
|
|
+** <li> [sqlite3_uri_key()],
|
|
|
+** <li> [sqlite3_filename_database()],
|
|
|
+** <li> [sqlite3_filename_journal()], or
|
|
|
+** <li> [sqlite3_filename_wal()].
|
|
|
+** </ul>
|
|
|
+** If a memory allocation error occurs, sqlite3_create_filename() might
|
|
|
+** return a NULL pointer. The memory obtained from sqlite3_create_filename(X)
|
|
|
+** must be released by a corresponding call to sqlite3_free_filename(Y).
|
|
|
+**
|
|
|
+** The P parameter in sqlite3_create_filename(D,J,W,N,P) should be an array
|
|
|
+** of 2*N pointers to strings. Each pair of pointers in this array corresponds
|
|
|
+** to a key and value for a query parameter. The P parameter may be a NULL
|
|
|
+** pointer if N is zero. None of the 2*N pointers in the P array may be
|
|
|
+** NULL pointers and key pointers should not be empty strings.
|
|
|
+** None of the D, J, or W parameters to sqlite3_create_filename(D,J,W,N,P) may
|
|
|
+** be NULL pointers, though they can be empty strings.
|
|
|
+**
|
|
|
+** The sqlite3_free_filename(Y) routine releases a memory allocation
|
|
|
+** previously obtained from sqlite3_create_filename(). Invoking
|
|
|
+** sqlite3_free_filename(Y) where Y is a NULL pointer is a harmless no-op.
|
|
|
+**
|
|
|
+** If the Y parameter to sqlite3_free_filename(Y) is anything other
|
|
|
+** than a NULL pointer or a pointer previously acquired from
|
|
|
+** sqlite3_create_filename(), then bad things such as heap
|
|
|
+** corruption or segfaults may occur. The value Y should not be
|
|
|
+** used again after sqlite3_free_filename(Y) has been called. This means
|
|
|
+** that if the [sqlite3_vfs.xOpen()] method of a VFS has been called using Y,
|
|
|
+** then the corresponding [sqlite3_module.xClose() method should also be
|
|
|
+** invoked prior to calling sqlite3_free_filename(Y).
|
|
|
+*/
|
|
|
+SQLITE_API char *sqlite3_create_filename(
|
|
|
+ const char *zDatabase,
|
|
|
+ const char *zJournal,
|
|
|
+ const char *zWal,
|
|
|
+ int nParam,
|
|
|
+ const char **azParam
|
|
|
+);
|
|
|
+SQLITE_API void sqlite3_free_filename(char*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Error Codes And Messages
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^If the most recent sqlite3_* API call associated with
|
|
|
+** [database connection] D failed, then the sqlite3_errcode(D) interface
|
|
|
+** returns the numeric [result code] or [extended result code] for that
|
|
|
+** API call.
|
|
|
+** ^The sqlite3_extended_errcode()
|
|
|
+** interface is the same except that it always returns the
|
|
|
+** [extended result code] even when extended result codes are
|
|
|
+** disabled.
|
|
|
+**
|
|
|
+** The values returned by sqlite3_errcode() and/or
|
|
|
+** sqlite3_extended_errcode() might change with each API call.
|
|
|
+** Except, there are some interfaces that are guaranteed to never
|
|
|
+** change the value of the error code. The error-code preserving
|
|
|
+** interfaces include the following:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> sqlite3_errcode()
|
|
|
+** <li> sqlite3_extended_errcode()
|
|
|
+** <li> sqlite3_errmsg()
|
|
|
+** <li> sqlite3_errmsg16()
|
|
|
+** <li> sqlite3_error_offset()
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** ^The sqlite3_errmsg() and sqlite3_errmsg16() return English-language
|
|
|
+** text that describes the error, as either UTF-8 or UTF-16 respectively.
|
|
|
+** ^(Memory to hold the error message string is managed internally.
|
|
|
+** The application does not need to worry about freeing the result.
|
|
|
+** However, the error string might be overwritten or deallocated by
|
|
|
+** subsequent calls to other SQLite interface functions.)^
|
|
|
+**
|
|
|
+** ^The sqlite3_errstr() interface returns the English-language text
|
|
|
+** that describes the [result code], as UTF-8.
|
|
|
+** ^(Memory to hold the error message string is managed internally
|
|
|
+** and must not be freed by the application)^.
|
|
|
+**
|
|
|
+** ^If the most recent error references a specific token in the input
|
|
|
+** SQL, the sqlite3_error_offset() interface returns the byte offset
|
|
|
+** of the start of that token. ^The byte offset returned by
|
|
|
+** sqlite3_error_offset() assumes that the input SQL is UTF8.
|
|
|
+** ^If the most recent error does not reference a specific token in the input
|
|
|
+** SQL, then the sqlite3_error_offset() function returns -1.
|
|
|
+**
|
|
|
+** When the serialized [threading mode] is in use, it might be the
|
|
|
+** case that a second error occurs on a separate thread in between
|
|
|
+** the time of the first error and the call to these interfaces.
|
|
|
+** When that happens, the second error will be reported since these
|
|
|
+** interfaces always report the most recent result. To avoid
|
|
|
+** this, each thread can obtain exclusive use of the [database connection] D
|
|
|
+** by invoking [sqlite3_mutex_enter]([sqlite3_db_mutex](D)) before beginning
|
|
|
+** to use D and invoking [sqlite3_mutex_leave]([sqlite3_db_mutex](D)) after
|
|
|
+** all calls to the interfaces listed here are completed.
|
|
|
+**
|
|
|
+** If an interface fails with SQLITE_MISUSE, that means the interface
|
|
|
+** was invoked incorrectly by the application. In that case, the
|
|
|
+** error code and message may or may not be set.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_errcode(sqlite3 *db);
|
|
|
+SQLITE_API int sqlite3_extended_errcode(sqlite3 *db);
|
|
|
+SQLITE_API const char *sqlite3_errmsg(sqlite3*);
|
|
|
+SQLITE_API const void *sqlite3_errmsg16(sqlite3*);
|
|
|
+SQLITE_API const char *sqlite3_errstr(int);
|
|
|
+SQLITE_API int sqlite3_error_offset(sqlite3 *db);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Prepared Statement Object
|
|
|
+** KEYWORDS: {prepared statement} {prepared statements}
|
|
|
+**
|
|
|
+** An instance of this object represents a single SQL statement that
|
|
|
+** has been compiled into binary form and is ready to be evaluated.
|
|
|
+**
|
|
|
+** Think of each SQL statement as a separate computer program. The
|
|
|
+** original SQL text is source code. A prepared statement object
|
|
|
+** is the compiled object code. All SQL must be converted into a
|
|
|
+** prepared statement before it can be run.
|
|
|
+**
|
|
|
+** The life-cycle of a prepared statement object usually goes like this:
|
|
|
+**
|
|
|
+** <ol>
|
|
|
+** <li> Create the prepared statement object using [sqlite3_prepare_v2()].
|
|
|
+** <li> Bind values to [parameters] using the sqlite3_bind_*()
|
|
|
+** interfaces.
|
|
|
+** <li> Run the SQL by calling [sqlite3_step()] one or more times.
|
|
|
+** <li> Reset the prepared statement using [sqlite3_reset()] then go back
|
|
|
+** to step 2. Do this zero or more times.
|
|
|
+** <li> Destroy the object using [sqlite3_finalize()].
|
|
|
+** </ol>
|
|
|
+*/
|
|
|
+typedef struct sqlite3_stmt sqlite3_stmt;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Run-time Limits
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^(This interface allows the size of various constructs to be limited
|
|
|
+** on a connection by connection basis. The first parameter is the
|
|
|
+** [database connection] whose limit is to be set or queried. The
|
|
|
+** second parameter is one of the [limit categories] that define a
|
|
|
+** class of constructs to be size limited. The third parameter is the
|
|
|
+** new limit for that construct.)^
|
|
|
+**
|
|
|
+** ^If the new limit is a negative number, the limit is unchanged.
|
|
|
+** ^(For each limit category SQLITE_LIMIT_<i>NAME</i> there is a
|
|
|
+** [limits | hard upper bound]
|
|
|
+** set at compile-time by a C preprocessor macro called
|
|
|
+** [limits | SQLITE_MAX_<i>NAME</i>].
|
|
|
+** (The "_LIMIT_" in the name is changed to "_MAX_".))^
|
|
|
+** ^Attempts to increase a limit above its hard upper bound are
|
|
|
+** silently truncated to the hard upper bound.
|
|
|
+**
|
|
|
+** ^Regardless of whether or not the limit was changed, the
|
|
|
+** [sqlite3_limit()] interface returns the prior value of the limit.
|
|
|
+** ^Hence, to find the current value of a limit without changing it,
|
|
|
+** simply invoke this interface with the third parameter set to -1.
|
|
|
+**
|
|
|
+** Run-time limits are intended for use in applications that manage
|
|
|
+** both their own internal database and also databases that are controlled
|
|
|
+** by untrusted external sources. An example application might be a
|
|
|
+** web browser that has its own databases for storing history and
|
|
|
+** separate databases controlled by JavaScript applications downloaded
|
|
|
+** off the Internet. The internal databases can be given the
|
|
|
+** large, default limits. Databases managed by external sources can
|
|
|
+** be given much smaller limits designed to prevent a denial of service
|
|
|
+** attack. Developers might also want to use the [sqlite3_set_authorizer()]
|
|
|
+** interface to further control untrusted SQL. The size of the database
|
|
|
+** created by an untrusted script can be contained using the
|
|
|
+** [max_page_count] [PRAGMA].
|
|
|
+**
|
|
|
+** New run-time limit categories may be added in future releases.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_limit(sqlite3*, int id, int newVal);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Run-Time Limit Categories
|
|
|
+** KEYWORDS: {limit category} {*limit categories}
|
|
|
+**
|
|
|
+** These constants define various performance limits
|
|
|
+** that can be lowered at run-time using [sqlite3_limit()].
|
|
|
+** The synopsis of the meanings of the various limits is shown below.
|
|
|
+** Additional information is available at [limits | Limits in SQLite].
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_LIMIT_LENGTH]] ^(<dt>SQLITE_LIMIT_LENGTH</dt>
|
|
|
+** <dd>The maximum size of any string or BLOB or table row, in bytes.<dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_SQL_LENGTH]] ^(<dt>SQLITE_LIMIT_SQL_LENGTH</dt>
|
|
|
+** <dd>The maximum length of an SQL statement, in bytes.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_COLUMN]] ^(<dt>SQLITE_LIMIT_COLUMN</dt>
|
|
|
+** <dd>The maximum number of columns in a table definition or in the
|
|
|
+** result set of a [SELECT] or the maximum number of columns in an index
|
|
|
+** or in an ORDER BY or GROUP BY clause.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_EXPR_DEPTH]] ^(<dt>SQLITE_LIMIT_EXPR_DEPTH</dt>
|
|
|
+** <dd>The maximum depth of the parse tree on any expression.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_COMPOUND_SELECT]] ^(<dt>SQLITE_LIMIT_COMPOUND_SELECT</dt>
|
|
|
+** <dd>The maximum number of terms in a compound SELECT statement.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_VDBE_OP]] ^(<dt>SQLITE_LIMIT_VDBE_OP</dt>
|
|
|
+** <dd>The maximum number of instructions in a virtual machine program
|
|
|
+** used to implement an SQL statement. If [sqlite3_prepare_v2()] or
|
|
|
+** the equivalent tries to allocate space for more than this many opcodes
|
|
|
+** in a single prepared statement, an SQLITE_NOMEM error is returned.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_FUNCTION_ARG]] ^(<dt>SQLITE_LIMIT_FUNCTION_ARG</dt>
|
|
|
+** <dd>The maximum number of arguments on a function.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_ATTACHED]] ^(<dt>SQLITE_LIMIT_ATTACHED</dt>
|
|
|
+** <dd>The maximum number of [ATTACH | attached databases].)^</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_LIKE_PATTERN_LENGTH]]
|
|
|
+** ^(<dt>SQLITE_LIMIT_LIKE_PATTERN_LENGTH</dt>
|
|
|
+** <dd>The maximum length of the pattern argument to the [LIKE] or
|
|
|
+** [GLOB] operators.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_VARIABLE_NUMBER]]
|
|
|
+** ^(<dt>SQLITE_LIMIT_VARIABLE_NUMBER</dt>
|
|
|
+** <dd>The maximum index number of any [parameter] in an SQL statement.)^
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_TRIGGER_DEPTH]] ^(<dt>SQLITE_LIMIT_TRIGGER_DEPTH</dt>
|
|
|
+** <dd>The maximum depth of recursion for triggers.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_LIMIT_WORKER_THREADS]] ^(<dt>SQLITE_LIMIT_WORKER_THREADS</dt>
|
|
|
+** <dd>The maximum number of auxiliary worker threads that a single
|
|
|
+** [prepared statement] may start.</dd>)^
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_LIMIT_LENGTH 0
|
|
|
+#define SQLITE_LIMIT_SQL_LENGTH 1
|
|
|
+#define SQLITE_LIMIT_COLUMN 2
|
|
|
+#define SQLITE_LIMIT_EXPR_DEPTH 3
|
|
|
+#define SQLITE_LIMIT_COMPOUND_SELECT 4
|
|
|
+#define SQLITE_LIMIT_VDBE_OP 5
|
|
|
+#define SQLITE_LIMIT_FUNCTION_ARG 6
|
|
|
+#define SQLITE_LIMIT_ATTACHED 7
|
|
|
+#define SQLITE_LIMIT_LIKE_PATTERN_LENGTH 8
|
|
|
+#define SQLITE_LIMIT_VARIABLE_NUMBER 9
|
|
|
+#define SQLITE_LIMIT_TRIGGER_DEPTH 10
|
|
|
+#define SQLITE_LIMIT_WORKER_THREADS 11
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Prepare Flags
|
|
|
+**
|
|
|
+** These constants define various flags that can be passed into
|
|
|
+** "prepFlags" parameter of the [sqlite3_prepare_v3()] and
|
|
|
+** [sqlite3_prepare16_v3()] interfaces.
|
|
|
+**
|
|
|
+** New flags may be added in future releases of SQLite.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_PREPARE_PERSISTENT]] ^(<dt>SQLITE_PREPARE_PERSISTENT</dt>
|
|
|
+** <dd>The SQLITE_PREPARE_PERSISTENT flag is a hint to the query planner
|
|
|
+** that the prepared statement will be retained for a long time and
|
|
|
+** probably reused many times.)^ ^Without this flag, [sqlite3_prepare_v3()]
|
|
|
+** and [sqlite3_prepare16_v3()] assume that the prepared statement will
|
|
|
+** be used just once or at most a few times and then destroyed using
|
|
|
+** [sqlite3_finalize()] relatively soon. The current implementation acts
|
|
|
+** on this hint by avoiding the use of [lookaside memory] so as not to
|
|
|
+** deplete the limited store of lookaside memory. Future versions of
|
|
|
+** SQLite may act on this hint differently.
|
|
|
+**
|
|
|
+** [[SQLITE_PREPARE_NORMALIZE]] <dt>SQLITE_PREPARE_NORMALIZE</dt>
|
|
|
+** <dd>The SQLITE_PREPARE_NORMALIZE flag is a no-op. This flag used
|
|
|
+** to be required for any prepared statement that wanted to use the
|
|
|
+** [sqlite3_normalized_sql()] interface. However, the
|
|
|
+** [sqlite3_normalized_sql()] interface is now available to all
|
|
|
+** prepared statements, regardless of whether or not they use this
|
|
|
+** flag.
|
|
|
+**
|
|
|
+** [[SQLITE_PREPARE_NO_VTAB]] <dt>SQLITE_PREPARE_NO_VTAB</dt>
|
|
|
+** <dd>The SQLITE_PREPARE_NO_VTAB flag causes the SQL compiler
|
|
|
+** to return an error (error code SQLITE_ERROR) if the statement uses
|
|
|
+** any virtual tables.
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_PREPARE_PERSISTENT 0x01
|
|
|
+#define SQLITE_PREPARE_NORMALIZE 0x02
|
|
|
+#define SQLITE_PREPARE_NO_VTAB 0x04
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Compiling An SQL Statement
|
|
|
+** KEYWORDS: {SQL statement compiler}
|
|
|
+** METHOD: sqlite3
|
|
|
+** CONSTRUCTOR: sqlite3_stmt
|
|
|
+**
|
|
|
+** To execute an SQL statement, it must first be compiled into a byte-code
|
|
|
+** program using one of these routines. Or, in other words, these routines
|
|
|
+** are constructors for the [prepared statement] object.
|
|
|
+**
|
|
|
+** The preferred routine to use is [sqlite3_prepare_v2()]. The
|
|
|
+** [sqlite3_prepare()] interface is legacy and should be avoided.
|
|
|
+** [sqlite3_prepare_v3()] has an extra "prepFlags" option that is used
|
|
|
+** for special purposes.
|
|
|
+**
|
|
|
+** The use of the UTF-8 interfaces is preferred, as SQLite currently
|
|
|
+** does all parsing using UTF-8. The UTF-16 interfaces are provided
|
|
|
+** as a convenience. The UTF-16 interfaces work by converting the
|
|
|
+** input text into UTF-8, then invoking the corresponding UTF-8 interface.
|
|
|
+**
|
|
|
+** The first argument, "db", is a [database connection] obtained from a
|
|
|
+** prior successful call to [sqlite3_open()], [sqlite3_open_v2()] or
|
|
|
+** [sqlite3_open16()]. The database connection must not have been closed.
|
|
|
+**
|
|
|
+** The second argument, "zSql", is the statement to be compiled, encoded
|
|
|
+** as either UTF-8 or UTF-16. The sqlite3_prepare(), sqlite3_prepare_v2(),
|
|
|
+** and sqlite3_prepare_v3()
|
|
|
+** interfaces use UTF-8, and sqlite3_prepare16(), sqlite3_prepare16_v2(),
|
|
|
+** and sqlite3_prepare16_v3() use UTF-16.
|
|
|
+**
|
|
|
+** ^If the nByte argument is negative, then zSql is read up to the
|
|
|
+** first zero terminator. ^If nByte is positive, then it is the
|
|
|
+** number of bytes read from zSql. ^If nByte is zero, then no prepared
|
|
|
+** statement is generated.
|
|
|
+** If the caller knows that the supplied string is nul-terminated, then
|
|
|
+** there is a small performance advantage to passing an nByte parameter that
|
|
|
+** is the number of bytes in the input string <i>including</i>
|
|
|
+** the nul-terminator.
|
|
|
+**
|
|
|
+** ^If pzTail is not NULL then *pzTail is made to point to the first byte
|
|
|
+** past the end of the first SQL statement in zSql. These routines only
|
|
|
+** compile the first statement in zSql, so *pzTail is left pointing to
|
|
|
+** what remains uncompiled.
|
|
|
+**
|
|
|
+** ^*ppStmt is left pointing to a compiled [prepared statement] that can be
|
|
|
+** executed using [sqlite3_step()]. ^If there is an error, *ppStmt is set
|
|
|
+** to NULL. ^If the input text contains no SQL (if the input is an empty
|
|
|
+** string or a comment) then *ppStmt is set to NULL.
|
|
|
+** The calling procedure is responsible for deleting the compiled
|
|
|
+** SQL statement using [sqlite3_finalize()] after it has finished with it.
|
|
|
+** ppStmt may not be NULL.
|
|
|
+**
|
|
|
+** ^On success, the sqlite3_prepare() family of routines return [SQLITE_OK];
|
|
|
+** otherwise an [error code] is returned.
|
|
|
+**
|
|
|
+** The sqlite3_prepare_v2(), sqlite3_prepare_v3(), sqlite3_prepare16_v2(),
|
|
|
+** and sqlite3_prepare16_v3() interfaces are recommended for all new programs.
|
|
|
+** The older interfaces (sqlite3_prepare() and sqlite3_prepare16())
|
|
|
+** are retained for backwards compatibility, but their use is discouraged.
|
|
|
+** ^In the "vX" interfaces, the prepared statement
|
|
|
+** that is returned (the [sqlite3_stmt] object) contains a copy of the
|
|
|
+** original SQL text. This causes the [sqlite3_step()] interface to
|
|
|
+** behave differently in three ways:
|
|
|
+**
|
|
|
+** <ol>
|
|
|
+** <li>
|
|
|
+** ^If the database schema changes, instead of returning [SQLITE_SCHEMA] as it
|
|
|
+** always used to do, [sqlite3_step()] will automatically recompile the SQL
|
|
|
+** statement and try to run it again. As many as [SQLITE_MAX_SCHEMA_RETRY]
|
|
|
+** retries will occur before sqlite3_step() gives up and returns an error.
|
|
|
+** </li>
|
|
|
+**
|
|
|
+** <li>
|
|
|
+** ^When an error occurs, [sqlite3_step()] will return one of the detailed
|
|
|
+** [error codes] or [extended error codes]. ^The legacy behavior was that
|
|
|
+** [sqlite3_step()] would only return a generic [SQLITE_ERROR] result code
|
|
|
+** and the application would have to make a second call to [sqlite3_reset()]
|
|
|
+** in order to find the underlying cause of the problem. With the "v2" prepare
|
|
|
+** interfaces, the underlying reason for the error is returned immediately.
|
|
|
+** </li>
|
|
|
+**
|
|
|
+** <li>
|
|
|
+** ^If the specific value bound to a [parameter | host parameter] in the
|
|
|
+** WHERE clause might influence the choice of query plan for a statement,
|
|
|
+** then the statement will be automatically recompiled, as if there had been
|
|
|
+** a schema change, on the first [sqlite3_step()] call following any change
|
|
|
+** to the [sqlite3_bind_text | bindings] of that [parameter].
|
|
|
+** ^The specific value of a WHERE-clause [parameter] might influence the
|
|
|
+** choice of query plan if the parameter is the left-hand side of a [LIKE]
|
|
|
+** or [GLOB] operator or if the parameter is compared to an indexed column
|
|
|
+** and the [SQLITE_ENABLE_STAT4] compile-time option is enabled.
|
|
|
+** </li>
|
|
|
+** </ol>
|
|
|
+**
|
|
|
+** <p>^sqlite3_prepare_v3() differs from sqlite3_prepare_v2() only in having
|
|
|
+** the extra prepFlags parameter, which is a bit array consisting of zero or
|
|
|
+** more of the [SQLITE_PREPARE_PERSISTENT|SQLITE_PREPARE_*] flags. ^The
|
|
|
+** sqlite3_prepare_v2() interface works exactly the same as
|
|
|
+** sqlite3_prepare_v3() with a zero prepFlags parameter.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_prepare(
|
|
|
+ sqlite3 *db, /* Database handle */
|
|
|
+ const char *zSql, /* SQL statement, UTF-8 encoded */
|
|
|
+ int nByte, /* Maximum length of zSql in bytes. */
|
|
|
+ sqlite3_stmt **ppStmt, /* OUT: Statement handle */
|
|
|
+ const char **pzTail /* OUT: Pointer to unused portion of zSql */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_prepare_v2(
|
|
|
+ sqlite3 *db, /* Database handle */
|
|
|
+ const char *zSql, /* SQL statement, UTF-8 encoded */
|
|
|
+ int nByte, /* Maximum length of zSql in bytes. */
|
|
|
+ sqlite3_stmt **ppStmt, /* OUT: Statement handle */
|
|
|
+ const char **pzTail /* OUT: Pointer to unused portion of zSql */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_prepare_v3(
|
|
|
+ sqlite3 *db, /* Database handle */
|
|
|
+ const char *zSql, /* SQL statement, UTF-8 encoded */
|
|
|
+ int nByte, /* Maximum length of zSql in bytes. */
|
|
|
+ unsigned int prepFlags, /* Zero or more SQLITE_PREPARE_ flags */
|
|
|
+ sqlite3_stmt **ppStmt, /* OUT: Statement handle */
|
|
|
+ const char **pzTail /* OUT: Pointer to unused portion of zSql */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_prepare16(
|
|
|
+ sqlite3 *db, /* Database handle */
|
|
|
+ const void *zSql, /* SQL statement, UTF-16 encoded */
|
|
|
+ int nByte, /* Maximum length of zSql in bytes. */
|
|
|
+ sqlite3_stmt **ppStmt, /* OUT: Statement handle */
|
|
|
+ const void **pzTail /* OUT: Pointer to unused portion of zSql */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_prepare16_v2(
|
|
|
+ sqlite3 *db, /* Database handle */
|
|
|
+ const void *zSql, /* SQL statement, UTF-16 encoded */
|
|
|
+ int nByte, /* Maximum length of zSql in bytes. */
|
|
|
+ sqlite3_stmt **ppStmt, /* OUT: Statement handle */
|
|
|
+ const void **pzTail /* OUT: Pointer to unused portion of zSql */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_prepare16_v3(
|
|
|
+ sqlite3 *db, /* Database handle */
|
|
|
+ const void *zSql, /* SQL statement, UTF-16 encoded */
|
|
|
+ int nByte, /* Maximum length of zSql in bytes. */
|
|
|
+ unsigned int prepFlags, /* Zero or more SQLITE_PREPARE_ flags */
|
|
|
+ sqlite3_stmt **ppStmt, /* OUT: Statement handle */
|
|
|
+ const void **pzTail /* OUT: Pointer to unused portion of zSql */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Retrieving Statement SQL
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^The sqlite3_sql(P) interface returns a pointer to a copy of the UTF-8
|
|
|
+** SQL text used to create [prepared statement] P if P was
|
|
|
+** created by [sqlite3_prepare_v2()], [sqlite3_prepare_v3()],
|
|
|
+** [sqlite3_prepare16_v2()], or [sqlite3_prepare16_v3()].
|
|
|
+** ^The sqlite3_expanded_sql(P) interface returns a pointer to a UTF-8
|
|
|
+** string containing the SQL text of prepared statement P with
|
|
|
+** [bound parameters] expanded.
|
|
|
+** ^The sqlite3_normalized_sql(P) interface returns a pointer to a UTF-8
|
|
|
+** string containing the normalized SQL text of prepared statement P. The
|
|
|
+** semantics used to normalize a SQL statement are unspecified and subject
|
|
|
+** to change. At a minimum, literal values will be replaced with suitable
|
|
|
+** placeholders.
|
|
|
+**
|
|
|
+** ^(For example, if a prepared statement is created using the SQL
|
|
|
+** text "SELECT $abc,:xyz" and if parameter $abc is bound to integer 2345
|
|
|
+** and parameter :xyz is unbound, then sqlite3_sql() will return
|
|
|
+** the original string, "SELECT $abc,:xyz" but sqlite3_expanded_sql()
|
|
|
+** will return "SELECT 2345,NULL".)^
|
|
|
+**
|
|
|
+** ^The sqlite3_expanded_sql() interface returns NULL if insufficient memory
|
|
|
+** is available to hold the result, or if the result would exceed the
|
|
|
+** the maximum string length determined by the [SQLITE_LIMIT_LENGTH].
|
|
|
+**
|
|
|
+** ^The [SQLITE_TRACE_SIZE_LIMIT] compile-time option limits the size of
|
|
|
+** bound parameter expansions. ^The [SQLITE_OMIT_TRACE] compile-time
|
|
|
+** option causes sqlite3_expanded_sql() to always return NULL.
|
|
|
+**
|
|
|
+** ^The strings returned by sqlite3_sql(P) and sqlite3_normalized_sql(P)
|
|
|
+** are managed by SQLite and are automatically freed when the prepared
|
|
|
+** statement is finalized.
|
|
|
+** ^The string returned by sqlite3_expanded_sql(P), on the other hand,
|
|
|
+** is obtained from [sqlite3_malloc()] and must be freed by the application
|
|
|
+** by passing it to [sqlite3_free()].
|
|
|
+**
|
|
|
+** ^The sqlite3_normalized_sql() interface is only available if
|
|
|
+** the [SQLITE_ENABLE_NORMALIZE] compile-time option is defined.
|
|
|
+*/
|
|
|
+SQLITE_API const char *sqlite3_sql(sqlite3_stmt *pStmt);
|
|
|
+SQLITE_API char *sqlite3_expanded_sql(sqlite3_stmt *pStmt);
|
|
|
+#ifdef SQLITE_ENABLE_NORMALIZE
|
|
|
+SQLITE_API const char *sqlite3_normalized_sql(sqlite3_stmt *pStmt);
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Determine If An SQL Statement Writes The Database
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^The sqlite3_stmt_readonly(X) interface returns true (non-zero) if
|
|
|
+** and only if the [prepared statement] X makes no direct changes to
|
|
|
+** the content of the database file.
|
|
|
+**
|
|
|
+** Note that [application-defined SQL functions] or
|
|
|
+** [virtual tables] might change the database indirectly as a side effect.
|
|
|
+** ^(For example, if an application defines a function "eval()" that
|
|
|
+** calls [sqlite3_exec()], then the following SQL statement would
|
|
|
+** change the database file through side-effects:
|
|
|
+**
|
|
|
+** <blockquote><pre>
|
|
|
+** SELECT eval('DELETE FROM t1') FROM t2;
|
|
|
+** </pre></blockquote>
|
|
|
+**
|
|
|
+** But because the [SELECT] statement does not change the database file
|
|
|
+** directly, sqlite3_stmt_readonly() would still return true.)^
|
|
|
+**
|
|
|
+** ^Transaction control statements such as [BEGIN], [COMMIT], [ROLLBACK],
|
|
|
+** [SAVEPOINT], and [RELEASE] cause sqlite3_stmt_readonly() to return true,
|
|
|
+** since the statements themselves do not actually modify the database but
|
|
|
+** rather they control the timing of when other statements modify the
|
|
|
+** database. ^The [ATTACH] and [DETACH] statements also cause
|
|
|
+** sqlite3_stmt_readonly() to return true since, while those statements
|
|
|
+** change the configuration of a database connection, they do not make
|
|
|
+** changes to the content of the database files on disk.
|
|
|
+** ^The sqlite3_stmt_readonly() interface returns true for [BEGIN] since
|
|
|
+** [BEGIN] merely sets internal flags, but the [BEGIN|BEGIN IMMEDIATE] and
|
|
|
+** [BEGIN|BEGIN EXCLUSIVE] commands do touch the database and so
|
|
|
+** sqlite3_stmt_readonly() returns false for those commands.
|
|
|
+**
|
|
|
+** ^This routine returns false if there is any possibility that the
|
|
|
+** statement might change the database file. ^A false return does
|
|
|
+** not guarantee that the statement will change the database file.
|
|
|
+** ^For example, an UPDATE statement might have a WHERE clause that
|
|
|
+** makes it a no-op, but the sqlite3_stmt_readonly() result would still
|
|
|
+** be false. ^Similarly, a CREATE TABLE IF NOT EXISTS statement is a
|
|
|
+** read-only no-op if the table already exists, but
|
|
|
+** sqlite3_stmt_readonly() still returns false for such a statement.
|
|
|
+**
|
|
|
+** ^If prepared statement X is an [EXPLAIN] or [EXPLAIN QUERY PLAN]
|
|
|
+** statement, then sqlite3_stmt_readonly(X) returns the same value as
|
|
|
+** if the EXPLAIN or EXPLAIN QUERY PLAN prefix were omitted.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_stmt_readonly(sqlite3_stmt *pStmt);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Query The EXPLAIN Setting For A Prepared Statement
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^The sqlite3_stmt_isexplain(S) interface returns 1 if the
|
|
|
+** prepared statement S is an EXPLAIN statement, or 2 if the
|
|
|
+** statement S is an EXPLAIN QUERY PLAN.
|
|
|
+** ^The sqlite3_stmt_isexplain(S) interface returns 0 if S is
|
|
|
+** an ordinary statement or a NULL pointer.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_stmt_isexplain(sqlite3_stmt *pStmt);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Determine If A Prepared Statement Has Been Reset
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^The sqlite3_stmt_busy(S) interface returns true (non-zero) if the
|
|
|
+** [prepared statement] S has been stepped at least once using
|
|
|
+** [sqlite3_step(S)] but has neither run to completion (returned
|
|
|
+** [SQLITE_DONE] from [sqlite3_step(S)]) nor
|
|
|
+** been reset using [sqlite3_reset(S)]. ^The sqlite3_stmt_busy(S)
|
|
|
+** interface returns false if S is a NULL pointer. If S is not a
|
|
|
+** NULL pointer and is not a pointer to a valid [prepared statement]
|
|
|
+** object, then the behavior is undefined and probably undesirable.
|
|
|
+**
|
|
|
+** This interface can be used in combination [sqlite3_next_stmt()]
|
|
|
+** to locate all prepared statements associated with a database
|
|
|
+** connection that are in need of being reset. This can be used,
|
|
|
+** for example, in diagnostic routines to search for prepared
|
|
|
+** statements that are holding a transaction open.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_stmt_busy(sqlite3_stmt*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Dynamically Typed Value Object
|
|
|
+** KEYWORDS: {protected sqlite3_value} {unprotected sqlite3_value}
|
|
|
+**
|
|
|
+** SQLite uses the sqlite3_value object to represent all values
|
|
|
+** that can be stored in a database table. SQLite uses dynamic typing
|
|
|
+** for the values it stores. ^Values stored in sqlite3_value objects
|
|
|
+** can be integers, floating point values, strings, BLOBs, or NULL.
|
|
|
+**
|
|
|
+** An sqlite3_value object may be either "protected" or "unprotected".
|
|
|
+** Some interfaces require a protected sqlite3_value. Other interfaces
|
|
|
+** will accept either a protected or an unprotected sqlite3_value.
|
|
|
+** Every interface that accepts sqlite3_value arguments specifies
|
|
|
+** whether or not it requires a protected sqlite3_value. The
|
|
|
+** [sqlite3_value_dup()] interface can be used to construct a new
|
|
|
+** protected sqlite3_value from an unprotected sqlite3_value.
|
|
|
+**
|
|
|
+** The terms "protected" and "unprotected" refer to whether or not
|
|
|
+** a mutex is held. An internal mutex is held for a protected
|
|
|
+** sqlite3_value object but no mutex is held for an unprotected
|
|
|
+** sqlite3_value object. If SQLite is compiled to be single-threaded
|
|
|
+** (with [SQLITE_THREADSAFE=0] and with [sqlite3_threadsafe()] returning 0)
|
|
|
+** or if SQLite is run in one of reduced mutex modes
|
|
|
+** [SQLITE_CONFIG_SINGLETHREAD] or [SQLITE_CONFIG_MULTITHREAD]
|
|
|
+** then there is no distinction between protected and unprotected
|
|
|
+** sqlite3_value objects and they can be used interchangeably. However,
|
|
|
+** for maximum code portability it is recommended that applications
|
|
|
+** still make the distinction between protected and unprotected
|
|
|
+** sqlite3_value objects even when not strictly required.
|
|
|
+**
|
|
|
+** ^The sqlite3_value objects that are passed as parameters into the
|
|
|
+** implementation of [application-defined SQL functions] are protected.
|
|
|
+** ^The sqlite3_value objects returned by [sqlite3_vtab_rhs_value()]
|
|
|
+** are protected.
|
|
|
+** ^The sqlite3_value object returned by
|
|
|
+** [sqlite3_column_value()] is unprotected.
|
|
|
+** Unprotected sqlite3_value objects may only be used as arguments
|
|
|
+** to [sqlite3_result_value()], [sqlite3_bind_value()], and
|
|
|
+** [sqlite3_value_dup()].
|
|
|
+** The [sqlite3_value_blob | sqlite3_value_type()] family of
|
|
|
+** interfaces require protected sqlite3_value objects.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_value sqlite3_value;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: SQL Function Context Object
|
|
|
+**
|
|
|
+** The context in which an SQL function executes is stored in an
|
|
|
+** sqlite3_context object. ^A pointer to an sqlite3_context object
|
|
|
+** is always first parameter to [application-defined SQL functions].
|
|
|
+** The application-defined SQL function implementation will pass this
|
|
|
+** pointer through into calls to [sqlite3_result_int | sqlite3_result()],
|
|
|
+** [sqlite3_aggregate_context()], [sqlite3_user_data()],
|
|
|
+** [sqlite3_context_db_handle()], [sqlite3_get_auxdata()],
|
|
|
+** and/or [sqlite3_set_auxdata()].
|
|
|
+*/
|
|
|
+typedef struct sqlite3_context sqlite3_context;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Binding Values To Prepared Statements
|
|
|
+** KEYWORDS: {host parameter} {host parameters} {host parameter name}
|
|
|
+** KEYWORDS: {SQL parameter} {SQL parameters} {parameter binding}
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^(In the SQL statement text input to [sqlite3_prepare_v2()] and its variants,
|
|
|
+** literals may be replaced by a [parameter] that matches one of following
|
|
|
+** templates:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> ?
|
|
|
+** <li> ?NNN
|
|
|
+** <li> :VVV
|
|
|
+** <li> @VVV
|
|
|
+** <li> $VVV
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** In the templates above, NNN represents an integer literal,
|
|
|
+** and VVV represents an alphanumeric identifier.)^ ^The values of these
|
|
|
+** parameters (also called "host parameter names" or "SQL parameters")
|
|
|
+** can be set using the sqlite3_bind_*() routines defined here.
|
|
|
+**
|
|
|
+** ^The first argument to the sqlite3_bind_*() routines is always
|
|
|
+** a pointer to the [sqlite3_stmt] object returned from
|
|
|
+** [sqlite3_prepare_v2()] or its variants.
|
|
|
+**
|
|
|
+** ^The second argument is the index of the SQL parameter to be set.
|
|
|
+** ^The leftmost SQL parameter has an index of 1. ^When the same named
|
|
|
+** SQL parameter is used more than once, second and subsequent
|
|
|
+** occurrences have the same index as the first occurrence.
|
|
|
+** ^The index for named parameters can be looked up using the
|
|
|
+** [sqlite3_bind_parameter_index()] API if desired. ^The index
|
|
|
+** for "?NNN" parameters is the value of NNN.
|
|
|
+** ^The NNN value must be between 1 and the [sqlite3_limit()]
|
|
|
+** parameter [SQLITE_LIMIT_VARIABLE_NUMBER] (default value: 32766).
|
|
|
+**
|
|
|
+** ^The third argument is the value to bind to the parameter.
|
|
|
+** ^If the third parameter to sqlite3_bind_text() or sqlite3_bind_text16()
|
|
|
+** or sqlite3_bind_blob() is a NULL pointer then the fourth parameter
|
|
|
+** is ignored and the end result is the same as sqlite3_bind_null().
|
|
|
+** ^If the third parameter to sqlite3_bind_text() is not NULL, then
|
|
|
+** it should be a pointer to well-formed UTF8 text.
|
|
|
+** ^If the third parameter to sqlite3_bind_text16() is not NULL, then
|
|
|
+** it should be a pointer to well-formed UTF16 text.
|
|
|
+** ^If the third parameter to sqlite3_bind_text64() is not NULL, then
|
|
|
+** it should be a pointer to a well-formed unicode string that is
|
|
|
+** either UTF8 if the sixth parameter is SQLITE_UTF8, or UTF16
|
|
|
+** otherwise.
|
|
|
+**
|
|
|
+** [[byte-order determination rules]] ^The byte-order of
|
|
|
+** UTF16 input text is determined by the byte-order mark (BOM, U+FEFF)
|
|
|
+** found in first character, which is removed, or in the absence of a BOM
|
|
|
+** the byte order is the native byte order of the host
|
|
|
+** machine for sqlite3_bind_text16() or the byte order specified in
|
|
|
+** the 6th parameter for sqlite3_bind_text64().)^
|
|
|
+** ^If UTF16 input text contains invalid unicode
|
|
|
+** characters, then SQLite might change those invalid characters
|
|
|
+** into the unicode replacement character: U+FFFD.
|
|
|
+**
|
|
|
+** ^(In those routines that have a fourth argument, its value is the
|
|
|
+** number of bytes in the parameter. To be clear: the value is the
|
|
|
+** number of <u>bytes</u> in the value, not the number of characters.)^
|
|
|
+** ^If the fourth parameter to sqlite3_bind_text() or sqlite3_bind_text16()
|
|
|
+** is negative, then the length of the string is
|
|
|
+** the number of bytes up to the first zero terminator.
|
|
|
+** If the fourth parameter to sqlite3_bind_blob() is negative, then
|
|
|
+** the behavior is undefined.
|
|
|
+** If a non-negative fourth parameter is provided to sqlite3_bind_text()
|
|
|
+** or sqlite3_bind_text16() or sqlite3_bind_text64() then
|
|
|
+** that parameter must be the byte offset
|
|
|
+** where the NUL terminator would occur assuming the string were NUL
|
|
|
+** terminated. If any NUL characters occurs at byte offsets less than
|
|
|
+** the value of the fourth parameter then the resulting string value will
|
|
|
+** contain embedded NULs. The result of expressions involving strings
|
|
|
+** with embedded NULs is undefined.
|
|
|
+**
|
|
|
+** ^The fifth argument to the BLOB and string binding interfaces controls
|
|
|
+** or indicates the lifetime of the object referenced by the third parameter.
|
|
|
+** These three options exist:
|
|
|
+** ^ (1) A destructor to dispose of the BLOB or string after SQLite has finished
|
|
|
+** with it may be passed. ^It is called to dispose of the BLOB or string even
|
|
|
+** if the call to the bind API fails, except the destructor is not called if
|
|
|
+** the third parameter is a NULL pointer or the fourth parameter is negative.
|
|
|
+** ^ (2) The special constant, [SQLITE_STATIC], may be passsed to indicate that
|
|
|
+** the application remains responsible for disposing of the object. ^In this
|
|
|
+** case, the object and the provided pointer to it must remain valid until
|
|
|
+** either the prepared statement is finalized or the same SQL parameter is
|
|
|
+** bound to something else, whichever occurs sooner.
|
|
|
+** ^ (3) The constant, [SQLITE_TRANSIENT], may be passed to indicate that the
|
|
|
+** object is to be copied prior to the return from sqlite3_bind_*(). ^The
|
|
|
+** object and pointer to it must remain valid until then. ^SQLite will then
|
|
|
+** manage the lifetime of its private copy.
|
|
|
+**
|
|
|
+** ^The sixth argument to sqlite3_bind_text64() must be one of
|
|
|
+** [SQLITE_UTF8], [SQLITE_UTF16], [SQLITE_UTF16BE], or [SQLITE_UTF16LE]
|
|
|
+** to specify the encoding of the text in the third parameter. If
|
|
|
+** the sixth argument to sqlite3_bind_text64() is not one of the
|
|
|
+** allowed values shown above, or if the text encoding is different
|
|
|
+** from the encoding specified by the sixth parameter, then the behavior
|
|
|
+** is undefined.
|
|
|
+**
|
|
|
+** ^The sqlite3_bind_zeroblob() routine binds a BLOB of length N that
|
|
|
+** is filled with zeroes. ^A zeroblob uses a fixed amount of memory
|
|
|
+** (just an integer to hold its size) while it is being processed.
|
|
|
+** Zeroblobs are intended to serve as placeholders for BLOBs whose
|
|
|
+** content is later written using
|
|
|
+** [sqlite3_blob_open | incremental BLOB I/O] routines.
|
|
|
+** ^A negative value for the zeroblob results in a zero-length BLOB.
|
|
|
+**
|
|
|
+** ^The sqlite3_bind_pointer(S,I,P,T,D) routine causes the I-th parameter in
|
|
|
+** [prepared statement] S to have an SQL value of NULL, but to also be
|
|
|
+** associated with the pointer P of type T. ^D is either a NULL pointer or
|
|
|
+** a pointer to a destructor function for P. ^SQLite will invoke the
|
|
|
+** destructor D with a single argument of P when it is finished using
|
|
|
+** P. The T parameter should be a static string, preferably a string
|
|
|
+** literal. The sqlite3_bind_pointer() routine is part of the
|
|
|
+** [pointer passing interface] added for SQLite 3.20.0.
|
|
|
+**
|
|
|
+** ^If any of the sqlite3_bind_*() routines are called with a NULL pointer
|
|
|
+** for the [prepared statement] or with a prepared statement for which
|
|
|
+** [sqlite3_step()] has been called more recently than [sqlite3_reset()],
|
|
|
+** then the call will return [SQLITE_MISUSE]. If any sqlite3_bind_()
|
|
|
+** routine is passed a [prepared statement] that has been finalized, the
|
|
|
+** result is undefined and probably harmful.
|
|
|
+**
|
|
|
+** ^Bindings are not cleared by the [sqlite3_reset()] routine.
|
|
|
+** ^Unbound parameters are interpreted as NULL.
|
|
|
+**
|
|
|
+** ^The sqlite3_bind_* routines return [SQLITE_OK] on success or an
|
|
|
+** [error code] if anything goes wrong.
|
|
|
+** ^[SQLITE_TOOBIG] might be returned if the size of a string or BLOB
|
|
|
+** exceeds limits imposed by [sqlite3_limit]([SQLITE_LIMIT_LENGTH]) or
|
|
|
+** [SQLITE_MAX_LENGTH].
|
|
|
+** ^[SQLITE_RANGE] is returned if the parameter
|
|
|
+** index is out of range. ^[SQLITE_NOMEM] is returned if malloc() fails.
|
|
|
+**
|
|
|
+** See also: [sqlite3_bind_parameter_count()],
|
|
|
+** [sqlite3_bind_parameter_name()], and [sqlite3_bind_parameter_index()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_bind_blob(sqlite3_stmt*, int, const void*, int n, void(*)(void*));
|
|
|
+SQLITE_API int sqlite3_bind_blob64(sqlite3_stmt*, int, const void*, sqlite3_uint64,
|
|
|
+ void(*)(void*));
|
|
|
+SQLITE_API int sqlite3_bind_double(sqlite3_stmt*, int, double);
|
|
|
+SQLITE_API int sqlite3_bind_int(sqlite3_stmt*, int, int);
|
|
|
+SQLITE_API int sqlite3_bind_int64(sqlite3_stmt*, int, sqlite3_int64);
|
|
|
+SQLITE_API int sqlite3_bind_null(sqlite3_stmt*, int);
|
|
|
+SQLITE_API int sqlite3_bind_text(sqlite3_stmt*,int,const char*,int,void(*)(void*));
|
|
|
+SQLITE_API int sqlite3_bind_text16(sqlite3_stmt*, int, const void*, int, void(*)(void*));
|
|
|
+SQLITE_API int sqlite3_bind_text64(sqlite3_stmt*, int, const char*, sqlite3_uint64,
|
|
|
+ void(*)(void*), unsigned char encoding);
|
|
|
+SQLITE_API int sqlite3_bind_value(sqlite3_stmt*, int, const sqlite3_value*);
|
|
|
+SQLITE_API int sqlite3_bind_pointer(sqlite3_stmt*, int, void*, const char*,void(*)(void*));
|
|
|
+SQLITE_API int sqlite3_bind_zeroblob(sqlite3_stmt*, int, int n);
|
|
|
+SQLITE_API int sqlite3_bind_zeroblob64(sqlite3_stmt*, int, sqlite3_uint64);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Number Of SQL Parameters
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^This routine can be used to find the number of [SQL parameters]
|
|
|
+** in a [prepared statement]. SQL parameters are tokens of the
|
|
|
+** form "?", "?NNN", ":AAA", "$AAA", or "@AAA" that serve as
|
|
|
+** placeholders for values that are [sqlite3_bind_blob | bound]
|
|
|
+** to the parameters at a later time.
|
|
|
+**
|
|
|
+** ^(This routine actually returns the index of the largest (rightmost)
|
|
|
+** parameter. For all forms except ?NNN, this will correspond to the
|
|
|
+** number of unique parameters. If parameters of the ?NNN form are used,
|
|
|
+** there may be gaps in the list.)^
|
|
|
+**
|
|
|
+** See also: [sqlite3_bind_blob|sqlite3_bind()],
|
|
|
+** [sqlite3_bind_parameter_name()], and
|
|
|
+** [sqlite3_bind_parameter_index()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_bind_parameter_count(sqlite3_stmt*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Name Of A Host Parameter
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^The sqlite3_bind_parameter_name(P,N) interface returns
|
|
|
+** the name of the N-th [SQL parameter] in the [prepared statement] P.
|
|
|
+** ^(SQL parameters of the form "?NNN" or ":AAA" or "@AAA" or "$AAA"
|
|
|
+** have a name which is the string "?NNN" or ":AAA" or "@AAA" or "$AAA"
|
|
|
+** respectively.
|
|
|
+** In other words, the initial ":" or "$" or "@" or "?"
|
|
|
+** is included as part of the name.)^
|
|
|
+** ^Parameters of the form "?" without a following integer have no name
|
|
|
+** and are referred to as "nameless" or "anonymous parameters".
|
|
|
+**
|
|
|
+** ^The first host parameter has an index of 1, not 0.
|
|
|
+**
|
|
|
+** ^If the value N is out of range or if the N-th parameter is
|
|
|
+** nameless, then NULL is returned. ^The returned string is
|
|
|
+** always in UTF-8 encoding even if the named parameter was
|
|
|
+** originally specified as UTF-16 in [sqlite3_prepare16()],
|
|
|
+** [sqlite3_prepare16_v2()], or [sqlite3_prepare16_v3()].
|
|
|
+**
|
|
|
+** See also: [sqlite3_bind_blob|sqlite3_bind()],
|
|
|
+** [sqlite3_bind_parameter_count()], and
|
|
|
+** [sqlite3_bind_parameter_index()].
|
|
|
+*/
|
|
|
+SQLITE_API const char *sqlite3_bind_parameter_name(sqlite3_stmt*, int);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Index Of A Parameter With A Given Name
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^Return the index of an SQL parameter given its name. ^The
|
|
|
+** index value returned is suitable for use as the second
|
|
|
+** parameter to [sqlite3_bind_blob|sqlite3_bind()]. ^A zero
|
|
|
+** is returned if no matching parameter is found. ^The parameter
|
|
|
+** name must be given in UTF-8 even if the original statement
|
|
|
+** was prepared from UTF-16 text using [sqlite3_prepare16_v2()] or
|
|
|
+** [sqlite3_prepare16_v3()].
|
|
|
+**
|
|
|
+** See also: [sqlite3_bind_blob|sqlite3_bind()],
|
|
|
+** [sqlite3_bind_parameter_count()], and
|
|
|
+** [sqlite3_bind_parameter_name()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_bind_parameter_index(sqlite3_stmt*, const char *zName);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Reset All Bindings On A Prepared Statement
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^Contrary to the intuition of many, [sqlite3_reset()] does not reset
|
|
|
+** the [sqlite3_bind_blob | bindings] on a [prepared statement].
|
|
|
+** ^Use this routine to reset all host parameters to NULL.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_clear_bindings(sqlite3_stmt*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Number Of Columns In A Result Set
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^Return the number of columns in the result set returned by the
|
|
|
+** [prepared statement]. ^If this routine returns 0, that means the
|
|
|
+** [prepared statement] returns no data (for example an [UPDATE]).
|
|
|
+** ^However, just because this routine returns a positive number does not
|
|
|
+** mean that one or more rows of data will be returned. ^A SELECT statement
|
|
|
+** will always have a positive sqlite3_column_count() but depending on the
|
|
|
+** WHERE clause constraints and the table content, it might return no rows.
|
|
|
+**
|
|
|
+** See also: [sqlite3_data_count()]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_column_count(sqlite3_stmt *pStmt);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Column Names In A Result Set
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^These routines return the name assigned to a particular column
|
|
|
+** in the result set of a [SELECT] statement. ^The sqlite3_column_name()
|
|
|
+** interface returns a pointer to a zero-terminated UTF-8 string
|
|
|
+** and sqlite3_column_name16() returns a pointer to a zero-terminated
|
|
|
+** UTF-16 string. ^The first parameter is the [prepared statement]
|
|
|
+** that implements the [SELECT] statement. ^The second parameter is the
|
|
|
+** column number. ^The leftmost column is number 0.
|
|
|
+**
|
|
|
+** ^The returned string pointer is valid until either the [prepared statement]
|
|
|
+** is destroyed by [sqlite3_finalize()] or until the statement is automatically
|
|
|
+** reprepared by the first call to [sqlite3_step()] for a particular run
|
|
|
+** or until the next call to
|
|
|
+** sqlite3_column_name() or sqlite3_column_name16() on the same column.
|
|
|
+**
|
|
|
+** ^If sqlite3_malloc() fails during the processing of either routine
|
|
|
+** (for example during a conversion from UTF-8 to UTF-16) then a
|
|
|
+** NULL pointer is returned.
|
|
|
+**
|
|
|
+** ^The name of a result column is the value of the "AS" clause for
|
|
|
+** that column, if there is an AS clause. If there is no AS clause
|
|
|
+** then the name of the column is unspecified and may change from
|
|
|
+** one release of SQLite to the next.
|
|
|
+*/
|
|
|
+SQLITE_API const char *sqlite3_column_name(sqlite3_stmt*, int N);
|
|
|
+SQLITE_API const void *sqlite3_column_name16(sqlite3_stmt*, int N);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Source Of Data In A Query Result
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^These routines provide a means to determine the database, table, and
|
|
|
+** table column that is the origin of a particular result column in
|
|
|
+** [SELECT] statement.
|
|
|
+** ^The name of the database or table or column can be returned as
|
|
|
+** either a UTF-8 or UTF-16 string. ^The _database_ routines return
|
|
|
+** the database name, the _table_ routines return the table name, and
|
|
|
+** the origin_ routines return the column name.
|
|
|
+** ^The returned string is valid until the [prepared statement] is destroyed
|
|
|
+** using [sqlite3_finalize()] or until the statement is automatically
|
|
|
+** reprepared by the first call to [sqlite3_step()] for a particular run
|
|
|
+** or until the same information is requested
|
|
|
+** again in a different encoding.
|
|
|
+**
|
|
|
+** ^The names returned are the original un-aliased names of the
|
|
|
+** database, table, and column.
|
|
|
+**
|
|
|
+** ^The first argument to these interfaces is a [prepared statement].
|
|
|
+** ^These functions return information about the Nth result column returned by
|
|
|
+** the statement, where N is the second function argument.
|
|
|
+** ^The left-most column is column 0 for these routines.
|
|
|
+**
|
|
|
+** ^If the Nth column returned by the statement is an expression or
|
|
|
+** subquery and is not a column value, then all of these functions return
|
|
|
+** NULL. ^These routines might also return NULL if a memory allocation error
|
|
|
+** occurs. ^Otherwise, they return the name of the attached database, table,
|
|
|
+** or column that query result column was extracted from.
|
|
|
+**
|
|
|
+** ^As with all other SQLite APIs, those whose names end with "16" return
|
|
|
+** UTF-16 encoded strings and the other functions return UTF-8.
|
|
|
+**
|
|
|
+** ^These APIs are only available if the library was compiled with the
|
|
|
+** [SQLITE_ENABLE_COLUMN_METADATA] C-preprocessor symbol.
|
|
|
+**
|
|
|
+** If two or more threads call one or more
|
|
|
+** [sqlite3_column_database_name | column metadata interfaces]
|
|
|
+** for the same [prepared statement] and result column
|
|
|
+** at the same time then the results are undefined.
|
|
|
+*/
|
|
|
+SQLITE_API const char *sqlite3_column_database_name(sqlite3_stmt*,int);
|
|
|
+SQLITE_API const void *sqlite3_column_database_name16(sqlite3_stmt*,int);
|
|
|
+SQLITE_API const char *sqlite3_column_table_name(sqlite3_stmt*,int);
|
|
|
+SQLITE_API const void *sqlite3_column_table_name16(sqlite3_stmt*,int);
|
|
|
+SQLITE_API const char *sqlite3_column_origin_name(sqlite3_stmt*,int);
|
|
|
+SQLITE_API const void *sqlite3_column_origin_name16(sqlite3_stmt*,int);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Declared Datatype Of A Query Result
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^(The first parameter is a [prepared statement].
|
|
|
+** If this statement is a [SELECT] statement and the Nth column of the
|
|
|
+** returned result set of that [SELECT] is a table column (not an
|
|
|
+** expression or subquery) then the declared type of the table
|
|
|
+** column is returned.)^ ^If the Nth column of the result set is an
|
|
|
+** expression or subquery, then a NULL pointer is returned.
|
|
|
+** ^The returned string is always UTF-8 encoded.
|
|
|
+**
|
|
|
+** ^(For example, given the database schema:
|
|
|
+**
|
|
|
+** CREATE TABLE t1(c1 VARIANT);
|
|
|
+**
|
|
|
+** and the following statement to be compiled:
|
|
|
+**
|
|
|
+** SELECT c1 + 1, c1 FROM t1;
|
|
|
+**
|
|
|
+** this routine would return the string "VARIANT" for the second result
|
|
|
+** column (i==1), and a NULL pointer for the first result column (i==0).)^
|
|
|
+**
|
|
|
+** ^SQLite uses dynamic run-time typing. ^So just because a column
|
|
|
+** is declared to contain a particular type does not mean that the
|
|
|
+** data stored in that column is of the declared type. SQLite is
|
|
|
+** strongly typed, but the typing is dynamic not static. ^Type
|
|
|
+** is associated with individual values, not with the containers
|
|
|
+** used to hold those values.
|
|
|
+*/
|
|
|
+SQLITE_API const char *sqlite3_column_decltype(sqlite3_stmt*,int);
|
|
|
+SQLITE_API const void *sqlite3_column_decltype16(sqlite3_stmt*,int);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Evaluate An SQL Statement
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** After a [prepared statement] has been prepared using any of
|
|
|
+** [sqlite3_prepare_v2()], [sqlite3_prepare_v3()], [sqlite3_prepare16_v2()],
|
|
|
+** or [sqlite3_prepare16_v3()] or one of the legacy
|
|
|
+** interfaces [sqlite3_prepare()] or [sqlite3_prepare16()], this function
|
|
|
+** must be called one or more times to evaluate the statement.
|
|
|
+**
|
|
|
+** The details of the behavior of the sqlite3_step() interface depend
|
|
|
+** on whether the statement was prepared using the newer "vX" interfaces
|
|
|
+** [sqlite3_prepare_v3()], [sqlite3_prepare_v2()], [sqlite3_prepare16_v3()],
|
|
|
+** [sqlite3_prepare16_v2()] or the older legacy
|
|
|
+** interfaces [sqlite3_prepare()] and [sqlite3_prepare16()]. The use of the
|
|
|
+** new "vX" interface is recommended for new applications but the legacy
|
|
|
+** interface will continue to be supported.
|
|
|
+**
|
|
|
+** ^In the legacy interface, the return value will be either [SQLITE_BUSY],
|
|
|
+** [SQLITE_DONE], [SQLITE_ROW], [SQLITE_ERROR], or [SQLITE_MISUSE].
|
|
|
+** ^With the "v2" interface, any of the other [result codes] or
|
|
|
+** [extended result codes] might be returned as well.
|
|
|
+**
|
|
|
+** ^[SQLITE_BUSY] means that the database engine was unable to acquire the
|
|
|
+** database locks it needs to do its job. ^If the statement is a [COMMIT]
|
|
|
+** or occurs outside of an explicit transaction, then you can retry the
|
|
|
+** statement. If the statement is not a [COMMIT] and occurs within an
|
|
|
+** explicit transaction then you should rollback the transaction before
|
|
|
+** continuing.
|
|
|
+**
|
|
|
+** ^[SQLITE_DONE] means that the statement has finished executing
|
|
|
+** successfully. sqlite3_step() should not be called again on this virtual
|
|
|
+** machine without first calling [sqlite3_reset()] to reset the virtual
|
|
|
+** machine back to its initial state.
|
|
|
+**
|
|
|
+** ^If the SQL statement being executed returns any data, then [SQLITE_ROW]
|
|
|
+** is returned each time a new row of data is ready for processing by the
|
|
|
+** caller. The values may be accessed using the [column access functions].
|
|
|
+** sqlite3_step() is called again to retrieve the next row of data.
|
|
|
+**
|
|
|
+** ^[SQLITE_ERROR] means that a run-time error (such as a constraint
|
|
|
+** violation) has occurred. sqlite3_step() should not be called again on
|
|
|
+** the VM. More information may be found by calling [sqlite3_errmsg()].
|
|
|
+** ^With the legacy interface, a more specific error code (for example,
|
|
|
+** [SQLITE_INTERRUPT], [SQLITE_SCHEMA], [SQLITE_CORRUPT], and so forth)
|
|
|
+** can be obtained by calling [sqlite3_reset()] on the
|
|
|
+** [prepared statement]. ^In the "v2" interface,
|
|
|
+** the more specific error code is returned directly by sqlite3_step().
|
|
|
+**
|
|
|
+** [SQLITE_MISUSE] means that the this routine was called inappropriately.
|
|
|
+** Perhaps it was called on a [prepared statement] that has
|
|
|
+** already been [sqlite3_finalize | finalized] or on one that had
|
|
|
+** previously returned [SQLITE_ERROR] or [SQLITE_DONE]. Or it could
|
|
|
+** be the case that the same database connection is being used by two or
|
|
|
+** more threads at the same moment in time.
|
|
|
+**
|
|
|
+** For all versions of SQLite up to and including 3.6.23.1, a call to
|
|
|
+** [sqlite3_reset()] was required after sqlite3_step() returned anything
|
|
|
+** other than [SQLITE_ROW] before any subsequent invocation of
|
|
|
+** sqlite3_step(). Failure to reset the prepared statement using
|
|
|
+** [sqlite3_reset()] would result in an [SQLITE_MISUSE] return from
|
|
|
+** sqlite3_step(). But after [version 3.6.23.1] ([dateof:3.6.23.1],
|
|
|
+** sqlite3_step() began
|
|
|
+** calling [sqlite3_reset()] automatically in this circumstance rather
|
|
|
+** than returning [SQLITE_MISUSE]. This is not considered a compatibility
|
|
|
+** break because any application that ever receives an SQLITE_MISUSE error
|
|
|
+** is broken by definition. The [SQLITE_OMIT_AUTORESET] compile-time option
|
|
|
+** can be used to restore the legacy behavior.
|
|
|
+**
|
|
|
+** <b>Goofy Interface Alert:</b> In the legacy interface, the sqlite3_step()
|
|
|
+** API always returns a generic error code, [SQLITE_ERROR], following any
|
|
|
+** error other than [SQLITE_BUSY] and [SQLITE_MISUSE]. You must call
|
|
|
+** [sqlite3_reset()] or [sqlite3_finalize()] in order to find one of the
|
|
|
+** specific [error codes] that better describes the error.
|
|
|
+** We admit that this is a goofy design. The problem has been fixed
|
|
|
+** with the "v2" interface. If you prepare all of your SQL statements
|
|
|
+** using [sqlite3_prepare_v3()] or [sqlite3_prepare_v2()]
|
|
|
+** or [sqlite3_prepare16_v2()] or [sqlite3_prepare16_v3()] instead
|
|
|
+** of the legacy [sqlite3_prepare()] and [sqlite3_prepare16()] interfaces,
|
|
|
+** then the more specific [error codes] are returned directly
|
|
|
+** by sqlite3_step(). The use of the "vX" interfaces is recommended.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_step(sqlite3_stmt*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Number of columns in a result set
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^The sqlite3_data_count(P) interface returns the number of columns in the
|
|
|
+** current row of the result set of [prepared statement] P.
|
|
|
+** ^If prepared statement P does not have results ready to return
|
|
|
+** (via calls to the [sqlite3_column_int | sqlite3_column()] family of
|
|
|
+** interfaces) then sqlite3_data_count(P) returns 0.
|
|
|
+** ^The sqlite3_data_count(P) routine also returns 0 if P is a NULL pointer.
|
|
|
+** ^The sqlite3_data_count(P) routine returns 0 if the previous call to
|
|
|
+** [sqlite3_step](P) returned [SQLITE_DONE]. ^The sqlite3_data_count(P)
|
|
|
+** will return non-zero if previous call to [sqlite3_step](P) returned
|
|
|
+** [SQLITE_ROW], except in the case of the [PRAGMA incremental_vacuum]
|
|
|
+** where it always returns zero since each step of that multi-step
|
|
|
+** pragma returns 0 columns of data.
|
|
|
+**
|
|
|
+** See also: [sqlite3_column_count()]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_data_count(sqlite3_stmt *pStmt);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Fundamental Datatypes
|
|
|
+** KEYWORDS: SQLITE_TEXT
|
|
|
+**
|
|
|
+** ^(Every value in SQLite has one of five fundamental datatypes:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> 64-bit signed integer
|
|
|
+** <li> 64-bit IEEE floating point number
|
|
|
+** <li> string
|
|
|
+** <li> BLOB
|
|
|
+** <li> NULL
|
|
|
+** </ul>)^
|
|
|
+**
|
|
|
+** These constants are codes for each of those types.
|
|
|
+**
|
|
|
+** Note that the SQLITE_TEXT constant was also used in SQLite version 2
|
|
|
+** for a completely different meaning. Software that links against both
|
|
|
+** SQLite version 2 and SQLite version 3 should use SQLITE3_TEXT, not
|
|
|
+** SQLITE_TEXT.
|
|
|
+*/
|
|
|
+#define SQLITE_INTEGER 1
|
|
|
+#define SQLITE_FLOAT 2
|
|
|
+#define SQLITE_BLOB 4
|
|
|
+#define SQLITE_NULL 5
|
|
|
+#ifdef SQLITE_TEXT
|
|
|
+# undef SQLITE_TEXT
|
|
|
+#else
|
|
|
+# define SQLITE_TEXT 3
|
|
|
+#endif
|
|
|
+#define SQLITE3_TEXT 3
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Result Values From A Query
|
|
|
+** KEYWORDS: {column access functions}
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** <b>Summary:</b>
|
|
|
+** <blockquote><table border=0 cellpadding=0 cellspacing=0>
|
|
|
+** <tr><td><b>sqlite3_column_blob</b><td>→<td>BLOB result
|
|
|
+** <tr><td><b>sqlite3_column_double</b><td>→<td>REAL result
|
|
|
+** <tr><td><b>sqlite3_column_int</b><td>→<td>32-bit INTEGER result
|
|
|
+** <tr><td><b>sqlite3_column_int64</b><td>→<td>64-bit INTEGER result
|
|
|
+** <tr><td><b>sqlite3_column_text</b><td>→<td>UTF-8 TEXT result
|
|
|
+** <tr><td><b>sqlite3_column_text16</b><td>→<td>UTF-16 TEXT result
|
|
|
+** <tr><td><b>sqlite3_column_value</b><td>→<td>The result as an
|
|
|
+** [sqlite3_value|unprotected sqlite3_value] object.
|
|
|
+** <tr><td> <td> <td>
|
|
|
+** <tr><td><b>sqlite3_column_bytes</b><td>→<td>Size of a BLOB
|
|
|
+** or a UTF-8 TEXT result in bytes
|
|
|
+** <tr><td><b>sqlite3_column_bytes16 </b>
|
|
|
+** <td>→ <td>Size of UTF-16
|
|
|
+** TEXT in bytes
|
|
|
+** <tr><td><b>sqlite3_column_type</b><td>→<td>Default
|
|
|
+** datatype of the result
|
|
|
+** </table></blockquote>
|
|
|
+**
|
|
|
+** <b>Details:</b>
|
|
|
+**
|
|
|
+** ^These routines return information about a single column of the current
|
|
|
+** result row of a query. ^In every case the first argument is a pointer
|
|
|
+** to the [prepared statement] that is being evaluated (the [sqlite3_stmt*]
|
|
|
+** that was returned from [sqlite3_prepare_v2()] or one of its variants)
|
|
|
+** and the second argument is the index of the column for which information
|
|
|
+** should be returned. ^The leftmost column of the result set has the index 0.
|
|
|
+** ^The number of columns in the result can be determined using
|
|
|
+** [sqlite3_column_count()].
|
|
|
+**
|
|
|
+** If the SQL statement does not currently point to a valid row, or if the
|
|
|
+** column index is out of range, the result is undefined.
|
|
|
+** These routines may only be called when the most recent call to
|
|
|
+** [sqlite3_step()] has returned [SQLITE_ROW] and neither
|
|
|
+** [sqlite3_reset()] nor [sqlite3_finalize()] have been called subsequently.
|
|
|
+** If any of these routines are called after [sqlite3_reset()] or
|
|
|
+** [sqlite3_finalize()] or after [sqlite3_step()] has returned
|
|
|
+** something other than [SQLITE_ROW], the results are undefined.
|
|
|
+** If [sqlite3_step()] or [sqlite3_reset()] or [sqlite3_finalize()]
|
|
|
+** are called from a different thread while any of these routines
|
|
|
+** are pending, then the results are undefined.
|
|
|
+**
|
|
|
+** The first six interfaces (_blob, _double, _int, _int64, _text, and _text16)
|
|
|
+** each return the value of a result column in a specific data format. If
|
|
|
+** the result column is not initially in the requested format (for example,
|
|
|
+** if the query returns an integer but the sqlite3_column_text() interface
|
|
|
+** is used to extract the value) then an automatic type conversion is performed.
|
|
|
+**
|
|
|
+** ^The sqlite3_column_type() routine returns the
|
|
|
+** [SQLITE_INTEGER | datatype code] for the initial data type
|
|
|
+** of the result column. ^The returned value is one of [SQLITE_INTEGER],
|
|
|
+** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].
|
|
|
+** The return value of sqlite3_column_type() can be used to decide which
|
|
|
+** of the first six interface should be used to extract the column value.
|
|
|
+** The value returned by sqlite3_column_type() is only meaningful if no
|
|
|
+** automatic type conversions have occurred for the value in question.
|
|
|
+** After a type conversion, the result of calling sqlite3_column_type()
|
|
|
+** is undefined, though harmless. Future
|
|
|
+** versions of SQLite may change the behavior of sqlite3_column_type()
|
|
|
+** following a type conversion.
|
|
|
+**
|
|
|
+** If the result is a BLOB or a TEXT string, then the sqlite3_column_bytes()
|
|
|
+** or sqlite3_column_bytes16() interfaces can be used to determine the size
|
|
|
+** of that BLOB or string.
|
|
|
+**
|
|
|
+** ^If the result is a BLOB or UTF-8 string then the sqlite3_column_bytes()
|
|
|
+** routine returns the number of bytes in that BLOB or string.
|
|
|
+** ^If the result is a UTF-16 string, then sqlite3_column_bytes() converts
|
|
|
+** the string to UTF-8 and then returns the number of bytes.
|
|
|
+** ^If the result is a numeric value then sqlite3_column_bytes() uses
|
|
|
+** [sqlite3_snprintf()] to convert that value to a UTF-8 string and returns
|
|
|
+** the number of bytes in that string.
|
|
|
+** ^If the result is NULL, then sqlite3_column_bytes() returns zero.
|
|
|
+**
|
|
|
+** ^If the result is a BLOB or UTF-16 string then the sqlite3_column_bytes16()
|
|
|
+** routine returns the number of bytes in that BLOB or string.
|
|
|
+** ^If the result is a UTF-8 string, then sqlite3_column_bytes16() converts
|
|
|
+** the string to UTF-16 and then returns the number of bytes.
|
|
|
+** ^If the result is a numeric value then sqlite3_column_bytes16() uses
|
|
|
+** [sqlite3_snprintf()] to convert that value to a UTF-16 string and returns
|
|
|
+** the number of bytes in that string.
|
|
|
+** ^If the result is NULL, then sqlite3_column_bytes16() returns zero.
|
|
|
+**
|
|
|
+** ^The values returned by [sqlite3_column_bytes()] and
|
|
|
+** [sqlite3_column_bytes16()] do not include the zero terminators at the end
|
|
|
+** of the string. ^For clarity: the values returned by
|
|
|
+** [sqlite3_column_bytes()] and [sqlite3_column_bytes16()] are the number of
|
|
|
+** bytes in the string, not the number of characters.
|
|
|
+**
|
|
|
+** ^Strings returned by sqlite3_column_text() and sqlite3_column_text16(),
|
|
|
+** even empty strings, are always zero-terminated. ^The return
|
|
|
+** value from sqlite3_column_blob() for a zero-length BLOB is a NULL pointer.
|
|
|
+**
|
|
|
+** ^Strings returned by sqlite3_column_text16() always have the endianness
|
|
|
+** which is native to the platform, regardless of the text encoding set
|
|
|
+** for the database.
|
|
|
+**
|
|
|
+** <b>Warning:</b> ^The object returned by [sqlite3_column_value()] is an
|
|
|
+** [unprotected sqlite3_value] object. In a multithreaded environment,
|
|
|
+** an unprotected sqlite3_value object may only be used safely with
|
|
|
+** [sqlite3_bind_value()] and [sqlite3_result_value()].
|
|
|
+** If the [unprotected sqlite3_value] object returned by
|
|
|
+** [sqlite3_column_value()] is used in any other way, including calls
|
|
|
+** to routines like [sqlite3_value_int()], [sqlite3_value_text()],
|
|
|
+** or [sqlite3_value_bytes()], the behavior is not threadsafe.
|
|
|
+** Hence, the sqlite3_column_value() interface
|
|
|
+** is normally only useful within the implementation of
|
|
|
+** [application-defined SQL functions] or [virtual tables], not within
|
|
|
+** top-level application code.
|
|
|
+**
|
|
|
+** These routines may attempt to convert the datatype of the result.
|
|
|
+** ^For example, if the internal representation is FLOAT and a text result
|
|
|
+** is requested, [sqlite3_snprintf()] is used internally to perform the
|
|
|
+** conversion automatically. ^(The following table details the conversions
|
|
|
+** that are applied:
|
|
|
+**
|
|
|
+** <blockquote>
|
|
|
+** <table border="1">
|
|
|
+** <tr><th> Internal<br>Type <th> Requested<br>Type <th> Conversion
|
|
|
+**
|
|
|
+** <tr><td> NULL <td> INTEGER <td> Result is 0
|
|
|
+** <tr><td> NULL <td> FLOAT <td> Result is 0.0
|
|
|
+** <tr><td> NULL <td> TEXT <td> Result is a NULL pointer
|
|
|
+** <tr><td> NULL <td> BLOB <td> Result is a NULL pointer
|
|
|
+** <tr><td> INTEGER <td> FLOAT <td> Convert from integer to float
|
|
|
+** <tr><td> INTEGER <td> TEXT <td> ASCII rendering of the integer
|
|
|
+** <tr><td> INTEGER <td> BLOB <td> Same as INTEGER->TEXT
|
|
|
+** <tr><td> FLOAT <td> INTEGER <td> [CAST] to INTEGER
|
|
|
+** <tr><td> FLOAT <td> TEXT <td> ASCII rendering of the float
|
|
|
+** <tr><td> FLOAT <td> BLOB <td> [CAST] to BLOB
|
|
|
+** <tr><td> TEXT <td> INTEGER <td> [CAST] to INTEGER
|
|
|
+** <tr><td> TEXT <td> FLOAT <td> [CAST] to REAL
|
|
|
+** <tr><td> TEXT <td> BLOB <td> No change
|
|
|
+** <tr><td> BLOB <td> INTEGER <td> [CAST] to INTEGER
|
|
|
+** <tr><td> BLOB <td> FLOAT <td> [CAST] to REAL
|
|
|
+** <tr><td> BLOB <td> TEXT <td> [CAST] to TEXT, ensure zero terminator
|
|
|
+** </table>
|
|
|
+** </blockquote>)^
|
|
|
+**
|
|
|
+** Note that when type conversions occur, pointers returned by prior
|
|
|
+** calls to sqlite3_column_blob(), sqlite3_column_text(), and/or
|
|
|
+** sqlite3_column_text16() may be invalidated.
|
|
|
+** Type conversions and pointer invalidations might occur
|
|
|
+** in the following cases:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> The initial content is a BLOB and sqlite3_column_text() or
|
|
|
+** sqlite3_column_text16() is called. A zero-terminator might
|
|
|
+** need to be added to the string.</li>
|
|
|
+** <li> The initial content is UTF-8 text and sqlite3_column_bytes16() or
|
|
|
+** sqlite3_column_text16() is called. The content must be converted
|
|
|
+** to UTF-16.</li>
|
|
|
+** <li> The initial content is UTF-16 text and sqlite3_column_bytes() or
|
|
|
+** sqlite3_column_text() is called. The content must be converted
|
|
|
+** to UTF-8.</li>
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** ^Conversions between UTF-16be and UTF-16le are always done in place and do
|
|
|
+** not invalidate a prior pointer, though of course the content of the buffer
|
|
|
+** that the prior pointer references will have been modified. Other kinds
|
|
|
+** of conversion are done in place when it is possible, but sometimes they
|
|
|
+** are not possible and in those cases prior pointers are invalidated.
|
|
|
+**
|
|
|
+** The safest policy is to invoke these routines
|
|
|
+** in one of the following ways:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li>sqlite3_column_text() followed by sqlite3_column_bytes()</li>
|
|
|
+** <li>sqlite3_column_blob() followed by sqlite3_column_bytes()</li>
|
|
|
+** <li>sqlite3_column_text16() followed by sqlite3_column_bytes16()</li>
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** In other words, you should call sqlite3_column_text(),
|
|
|
+** sqlite3_column_blob(), or sqlite3_column_text16() first to force the result
|
|
|
+** into the desired format, then invoke sqlite3_column_bytes() or
|
|
|
+** sqlite3_column_bytes16() to find the size of the result. Do not mix calls
|
|
|
+** to sqlite3_column_text() or sqlite3_column_blob() with calls to
|
|
|
+** sqlite3_column_bytes16(), and do not mix calls to sqlite3_column_text16()
|
|
|
+** with calls to sqlite3_column_bytes().
|
|
|
+**
|
|
|
+** ^The pointers returned are valid until a type conversion occurs as
|
|
|
+** described above, or until [sqlite3_step()] or [sqlite3_reset()] or
|
|
|
+** [sqlite3_finalize()] is called. ^The memory space used to hold strings
|
|
|
+** and BLOBs is freed automatically. Do not pass the pointers returned
|
|
|
+** from [sqlite3_column_blob()], [sqlite3_column_text()], etc. into
|
|
|
+** [sqlite3_free()].
|
|
|
+**
|
|
|
+** As long as the input parameters are correct, these routines will only
|
|
|
+** fail if an out-of-memory error occurs during a format conversion.
|
|
|
+** Only the following subset of interfaces are subject to out-of-memory
|
|
|
+** errors:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> sqlite3_column_blob()
|
|
|
+** <li> sqlite3_column_text()
|
|
|
+** <li> sqlite3_column_text16()
|
|
|
+** <li> sqlite3_column_bytes()
|
|
|
+** <li> sqlite3_column_bytes16()
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** If an out-of-memory error occurs, then the return value from these
|
|
|
+** routines is the same as if the column had contained an SQL NULL value.
|
|
|
+** Valid SQL NULL returns can be distinguished from out-of-memory errors
|
|
|
+** by invoking the [sqlite3_errcode()] immediately after the suspect
|
|
|
+** return value is obtained and before any
|
|
|
+** other SQLite interface is called on the same [database connection].
|
|
|
+*/
|
|
|
+SQLITE_API const void *sqlite3_column_blob(sqlite3_stmt*, int iCol);
|
|
|
+SQLITE_API double sqlite3_column_double(sqlite3_stmt*, int iCol);
|
|
|
+SQLITE_API int sqlite3_column_int(sqlite3_stmt*, int iCol);
|
|
|
+SQLITE_API sqlite3_int64 sqlite3_column_int64(sqlite3_stmt*, int iCol);
|
|
|
+SQLITE_API const unsigned char *sqlite3_column_text(sqlite3_stmt*, int iCol);
|
|
|
+SQLITE_API const void *sqlite3_column_text16(sqlite3_stmt*, int iCol);
|
|
|
+SQLITE_API sqlite3_value *sqlite3_column_value(sqlite3_stmt*, int iCol);
|
|
|
+SQLITE_API int sqlite3_column_bytes(sqlite3_stmt*, int iCol);
|
|
|
+SQLITE_API int sqlite3_column_bytes16(sqlite3_stmt*, int iCol);
|
|
|
+SQLITE_API int sqlite3_column_type(sqlite3_stmt*, int iCol);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Destroy A Prepared Statement Object
|
|
|
+** DESTRUCTOR: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^The sqlite3_finalize() function is called to delete a [prepared statement].
|
|
|
+** ^If the most recent evaluation of the statement encountered no errors
|
|
|
+** or if the statement is never been evaluated, then sqlite3_finalize() returns
|
|
|
+** SQLITE_OK. ^If the most recent evaluation of statement S failed, then
|
|
|
+** sqlite3_finalize(S) returns the appropriate [error code] or
|
|
|
+** [extended error code].
|
|
|
+**
|
|
|
+** ^The sqlite3_finalize(S) routine can be called at any point during
|
|
|
+** the life cycle of [prepared statement] S:
|
|
|
+** before statement S is ever evaluated, after
|
|
|
+** one or more calls to [sqlite3_reset()], or after any call
|
|
|
+** to [sqlite3_step()] regardless of whether or not the statement has
|
|
|
+** completed execution.
|
|
|
+**
|
|
|
+** ^Invoking sqlite3_finalize() on a NULL pointer is a harmless no-op.
|
|
|
+**
|
|
|
+** The application must finalize every [prepared statement] in order to avoid
|
|
|
+** resource leaks. It is a grievous error for the application to try to use
|
|
|
+** a prepared statement after it has been finalized. Any use of a prepared
|
|
|
+** statement after it has been finalized can result in undefined and
|
|
|
+** undesirable behavior such as segfaults and heap corruption.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_finalize(sqlite3_stmt *pStmt);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Reset A Prepared Statement Object
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** The sqlite3_reset() function is called to reset a [prepared statement]
|
|
|
+** object back to its initial state, ready to be re-executed.
|
|
|
+** ^Any SQL statement variables that had values bound to them using
|
|
|
+** the [sqlite3_bind_blob | sqlite3_bind_*() API] retain their values.
|
|
|
+** Use [sqlite3_clear_bindings()] to reset the bindings.
|
|
|
+**
|
|
|
+** ^The [sqlite3_reset(S)] interface resets the [prepared statement] S
|
|
|
+** back to the beginning of its program.
|
|
|
+**
|
|
|
+** ^If the most recent call to [sqlite3_step(S)] for the
|
|
|
+** [prepared statement] S returned [SQLITE_ROW] or [SQLITE_DONE],
|
|
|
+** or if [sqlite3_step(S)] has never before been called on S,
|
|
|
+** then [sqlite3_reset(S)] returns [SQLITE_OK].
|
|
|
+**
|
|
|
+** ^If the most recent call to [sqlite3_step(S)] for the
|
|
|
+** [prepared statement] S indicated an error, then
|
|
|
+** [sqlite3_reset(S)] returns an appropriate [error code].
|
|
|
+**
|
|
|
+** ^The [sqlite3_reset(S)] interface does not change the values
|
|
|
+** of any [sqlite3_bind_blob|bindings] on the [prepared statement] S.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_reset(sqlite3_stmt *pStmt);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Create Or Redefine SQL Functions
|
|
|
+** KEYWORDS: {function creation routines}
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^These functions (collectively known as "function creation routines")
|
|
|
+** are used to add SQL functions or aggregates or to redefine the behavior
|
|
|
+** of existing SQL functions or aggregates. The only differences between
|
|
|
+** the three "sqlite3_create_function*" routines are the text encoding
|
|
|
+** expected for the second parameter (the name of the function being
|
|
|
+** created) and the presence or absence of a destructor callback for
|
|
|
+** the application data pointer. Function sqlite3_create_window_function()
|
|
|
+** is similar, but allows the user to supply the extra callback functions
|
|
|
+** needed by [aggregate window functions].
|
|
|
+**
|
|
|
+** ^The first parameter is the [database connection] to which the SQL
|
|
|
+** function is to be added. ^If an application uses more than one database
|
|
|
+** connection then application-defined SQL functions must be added
|
|
|
+** to each database connection separately.
|
|
|
+**
|
|
|
+** ^The second parameter is the name of the SQL function to be created or
|
|
|
+** redefined. ^The length of the name is limited to 255 bytes in a UTF-8
|
|
|
+** representation, exclusive of the zero-terminator. ^Note that the name
|
|
|
+** length limit is in UTF-8 bytes, not characters nor UTF-16 bytes.
|
|
|
+** ^Any attempt to create a function with a longer name
|
|
|
+** will result in [SQLITE_MISUSE] being returned.
|
|
|
+**
|
|
|
+** ^The third parameter (nArg)
|
|
|
+** is the number of arguments that the SQL function or
|
|
|
+** aggregate takes. ^If this parameter is -1, then the SQL function or
|
|
|
+** aggregate may take any number of arguments between 0 and the limit
|
|
|
+** set by [sqlite3_limit]([SQLITE_LIMIT_FUNCTION_ARG]). If the third
|
|
|
+** parameter is less than -1 or greater than 127 then the behavior is
|
|
|
+** undefined.
|
|
|
+**
|
|
|
+** ^The fourth parameter, eTextRep, specifies what
|
|
|
+** [SQLITE_UTF8 | text encoding] this SQL function prefers for
|
|
|
+** its parameters. The application should set this parameter to
|
|
|
+** [SQLITE_UTF16LE] if the function implementation invokes
|
|
|
+** [sqlite3_value_text16le()] on an input, or [SQLITE_UTF16BE] if the
|
|
|
+** implementation invokes [sqlite3_value_text16be()] on an input, or
|
|
|
+** [SQLITE_UTF16] if [sqlite3_value_text16()] is used, or [SQLITE_UTF8]
|
|
|
+** otherwise. ^The same SQL function may be registered multiple times using
|
|
|
+** different preferred text encodings, with different implementations for
|
|
|
+** each encoding.
|
|
|
+** ^When multiple implementations of the same function are available, SQLite
|
|
|
+** will pick the one that involves the least amount of data conversion.
|
|
|
+**
|
|
|
+** ^The fourth parameter may optionally be ORed with [SQLITE_DETERMINISTIC]
|
|
|
+** to signal that the function will always return the same result given
|
|
|
+** the same inputs within a single SQL statement. Most SQL functions are
|
|
|
+** deterministic. The built-in [random()] SQL function is an example of a
|
|
|
+** function that is not deterministic. The SQLite query planner is able to
|
|
|
+** perform additional optimizations on deterministic functions, so use
|
|
|
+** of the [SQLITE_DETERMINISTIC] flag is recommended where possible.
|
|
|
+**
|
|
|
+** ^The fourth parameter may also optionally include the [SQLITE_DIRECTONLY]
|
|
|
+** flag, which if present prevents the function from being invoked from
|
|
|
+** within VIEWs, TRIGGERs, CHECK constraints, generated column expressions,
|
|
|
+** index expressions, or the WHERE clause of partial indexes.
|
|
|
+**
|
|
|
+** For best security, the [SQLITE_DIRECTONLY] flag is recommended for
|
|
|
+** all application-defined SQL functions that do not need to be
|
|
|
+** used inside of triggers, view, CHECK constraints, or other elements of
|
|
|
+** the database schema. This flags is especially recommended for SQL
|
|
|
+** functions that have side effects or reveal internal application state.
|
|
|
+** Without this flag, an attacker might be able to modify the schema of
|
|
|
+** a database file to include invocations of the function with parameters
|
|
|
+** chosen by the attacker, which the application will then execute when
|
|
|
+** the database file is opened and read.
|
|
|
+**
|
|
|
+** ^(The fifth parameter is an arbitrary pointer. The implementation of the
|
|
|
+** function can gain access to this pointer using [sqlite3_user_data()].)^
|
|
|
+**
|
|
|
+** ^The sixth, seventh and eighth parameters passed to the three
|
|
|
+** "sqlite3_create_function*" functions, xFunc, xStep and xFinal, are
|
|
|
+** pointers to C-language functions that implement the SQL function or
|
|
|
+** aggregate. ^A scalar SQL function requires an implementation of the xFunc
|
|
|
+** callback only; NULL pointers must be passed as the xStep and xFinal
|
|
|
+** parameters. ^An aggregate SQL function requires an implementation of xStep
|
|
|
+** and xFinal and NULL pointer must be passed for xFunc. ^To delete an existing
|
|
|
+** SQL function or aggregate, pass NULL pointers for all three function
|
|
|
+** callbacks.
|
|
|
+**
|
|
|
+** ^The sixth, seventh, eighth and ninth parameters (xStep, xFinal, xValue
|
|
|
+** and xInverse) passed to sqlite3_create_window_function are pointers to
|
|
|
+** C-language callbacks that implement the new function. xStep and xFinal
|
|
|
+** must both be non-NULL. xValue and xInverse may either both be NULL, in
|
|
|
+** which case a regular aggregate function is created, or must both be
|
|
|
+** non-NULL, in which case the new function may be used as either an aggregate
|
|
|
+** or aggregate window function. More details regarding the implementation
|
|
|
+** of aggregate window functions are
|
|
|
+** [user-defined window functions|available here].
|
|
|
+**
|
|
|
+** ^(If the final parameter to sqlite3_create_function_v2() or
|
|
|
+** sqlite3_create_window_function() is not NULL, then it is destructor for
|
|
|
+** the application data pointer. The destructor is invoked when the function
|
|
|
+** is deleted, either by being overloaded or when the database connection
|
|
|
+** closes.)^ ^The destructor is also invoked if the call to
|
|
|
+** sqlite3_create_function_v2() fails. ^When the destructor callback is
|
|
|
+** invoked, it is passed a single argument which is a copy of the application
|
|
|
+** data pointer which was the fifth parameter to sqlite3_create_function_v2().
|
|
|
+**
|
|
|
+** ^It is permitted to register multiple implementations of the same
|
|
|
+** functions with the same name but with either differing numbers of
|
|
|
+** arguments or differing preferred text encodings. ^SQLite will use
|
|
|
+** the implementation that most closely matches the way in which the
|
|
|
+** SQL function is used. ^A function implementation with a non-negative
|
|
|
+** nArg parameter is a better match than a function implementation with
|
|
|
+** a negative nArg. ^A function where the preferred text encoding
|
|
|
+** matches the database encoding is a better
|
|
|
+** match than a function where the encoding is different.
|
|
|
+** ^A function where the encoding difference is between UTF16le and UTF16be
|
|
|
+** is a closer match than a function where the encoding difference is
|
|
|
+** between UTF8 and UTF16.
|
|
|
+**
|
|
|
+** ^Built-in functions may be overloaded by new application-defined functions.
|
|
|
+**
|
|
|
+** ^An application-defined function is permitted to call other
|
|
|
+** SQLite interfaces. However, such calls must not
|
|
|
+** close the database connection nor finalize or reset the prepared
|
|
|
+** statement in which the function is running.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_create_function(
|
|
|
+ sqlite3 *db,
|
|
|
+ const char *zFunctionName,
|
|
|
+ int nArg,
|
|
|
+ int eTextRep,
|
|
|
+ void *pApp,
|
|
|
+ void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
|
|
|
+ void (*xStep)(sqlite3_context*,int,sqlite3_value**),
|
|
|
+ void (*xFinal)(sqlite3_context*)
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_create_function16(
|
|
|
+ sqlite3 *db,
|
|
|
+ const void *zFunctionName,
|
|
|
+ int nArg,
|
|
|
+ int eTextRep,
|
|
|
+ void *pApp,
|
|
|
+ void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
|
|
|
+ void (*xStep)(sqlite3_context*,int,sqlite3_value**),
|
|
|
+ void (*xFinal)(sqlite3_context*)
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_create_function_v2(
|
|
|
+ sqlite3 *db,
|
|
|
+ const char *zFunctionName,
|
|
|
+ int nArg,
|
|
|
+ int eTextRep,
|
|
|
+ void *pApp,
|
|
|
+ void (*xFunc)(sqlite3_context*,int,sqlite3_value**),
|
|
|
+ void (*xStep)(sqlite3_context*,int,sqlite3_value**),
|
|
|
+ void (*xFinal)(sqlite3_context*),
|
|
|
+ void(*xDestroy)(void*)
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_create_window_function(
|
|
|
+ sqlite3 *db,
|
|
|
+ const char *zFunctionName,
|
|
|
+ int nArg,
|
|
|
+ int eTextRep,
|
|
|
+ void *pApp,
|
|
|
+ void (*xStep)(sqlite3_context*,int,sqlite3_value**),
|
|
|
+ void (*xFinal)(sqlite3_context*),
|
|
|
+ void (*xValue)(sqlite3_context*),
|
|
|
+ void (*xInverse)(sqlite3_context*,int,sqlite3_value**),
|
|
|
+ void(*xDestroy)(void*)
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Text Encodings
|
|
|
+**
|
|
|
+** These constant define integer codes that represent the various
|
|
|
+** text encodings supported by SQLite.
|
|
|
+*/
|
|
|
+#define SQLITE_UTF8 1 /* IMP: R-37514-35566 */
|
|
|
+#define SQLITE_UTF16LE 2 /* IMP: R-03371-37637 */
|
|
|
+#define SQLITE_UTF16BE 3 /* IMP: R-51971-34154 */
|
|
|
+#define SQLITE_UTF16 4 /* Use native byte order */
|
|
|
+#define SQLITE_ANY 5 /* Deprecated */
|
|
|
+#define SQLITE_UTF16_ALIGNED 8 /* sqlite3_create_collation only */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Function Flags
|
|
|
+**
|
|
|
+** These constants may be ORed together with the
|
|
|
+** [SQLITE_UTF8 | preferred text encoding] as the fourth argument
|
|
|
+** to [sqlite3_create_function()], [sqlite3_create_function16()], or
|
|
|
+** [sqlite3_create_function_v2()].
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_DETERMINISTIC]] <dt>SQLITE_DETERMINISTIC</dt><dd>
|
|
|
+** The SQLITE_DETERMINISTIC flag means that the new function always gives
|
|
|
+** the same output when the input parameters are the same.
|
|
|
+** The [abs|abs() function] is deterministic, for example, but
|
|
|
+** [randomblob|randomblob()] is not. Functions must
|
|
|
+** be deterministic in order to be used in certain contexts such as
|
|
|
+** with the WHERE clause of [partial indexes] or in [generated columns].
|
|
|
+** SQLite might also optimize deterministic functions by factoring them
|
|
|
+** out of inner loops.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DIRECTONLY]] <dt>SQLITE_DIRECTONLY</dt><dd>
|
|
|
+** The SQLITE_DIRECTONLY flag means that the function may only be invoked
|
|
|
+** from top-level SQL, and cannot be used in VIEWs or TRIGGERs nor in
|
|
|
+** schema structures such as [CHECK constraints], [DEFAULT clauses],
|
|
|
+** [expression indexes], [partial indexes], or [generated columns].
|
|
|
+** The SQLITE_DIRECTONLY flags is a security feature which is recommended
|
|
|
+** for all [application-defined SQL functions], and especially for functions
|
|
|
+** that have side-effects or that could potentially leak sensitive
|
|
|
+** information.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_INNOCUOUS]] <dt>SQLITE_INNOCUOUS</dt><dd>
|
|
|
+** The SQLITE_INNOCUOUS flag means that the function is unlikely
|
|
|
+** to cause problems even if misused. An innocuous function should have
|
|
|
+** no side effects and should not depend on any values other than its
|
|
|
+** input parameters. The [abs|abs() function] is an example of an
|
|
|
+** innocuous function.
|
|
|
+** The [load_extension() SQL function] is not innocuous because of its
|
|
|
+** side effects.
|
|
|
+** <p> SQLITE_INNOCUOUS is similar to SQLITE_DETERMINISTIC, but is not
|
|
|
+** exactly the same. The [random|random() function] is an example of a
|
|
|
+** function that is innocuous but not deterministic.
|
|
|
+** <p>Some heightened security settings
|
|
|
+** ([SQLITE_DBCONFIG_TRUSTED_SCHEMA] and [PRAGMA trusted_schema=OFF])
|
|
|
+** disable the use of SQL functions inside views and triggers and in
|
|
|
+** schema structures such as [CHECK constraints], [DEFAULT clauses],
|
|
|
+** [expression indexes], [partial indexes], and [generated columns] unless
|
|
|
+** the function is tagged with SQLITE_INNOCUOUS. Most built-in functions
|
|
|
+** are innocuous. Developers are advised to avoid using the
|
|
|
+** SQLITE_INNOCUOUS flag for application-defined functions unless the
|
|
|
+** function has been carefully audited and found to be free of potentially
|
|
|
+** security-adverse side-effects and information-leaks.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_SUBTYPE]] <dt>SQLITE_SUBTYPE</dt><dd>
|
|
|
+** The SQLITE_SUBTYPE flag indicates to SQLite that a function may call
|
|
|
+** [sqlite3_value_subtype()] to inspect the sub-types of its arguments.
|
|
|
+** Specifying this flag makes no difference for scalar or aggregate user
|
|
|
+** functions. However, if it is not specified for a user-defined window
|
|
|
+** function, then any sub-types belonging to arguments passed to the window
|
|
|
+** function may be discarded before the window function is called (i.e.
|
|
|
+** sqlite3_value_subtype() will always return 0).
|
|
|
+** </dd>
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_DETERMINISTIC 0x000000800
|
|
|
+#define SQLITE_DIRECTONLY 0x000080000
|
|
|
+#define SQLITE_SUBTYPE 0x000100000
|
|
|
+#define SQLITE_INNOCUOUS 0x000200000
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Deprecated Functions
|
|
|
+** DEPRECATED
|
|
|
+**
|
|
|
+** These functions are [deprecated]. In order to maintain
|
|
|
+** backwards compatibility with older code, these functions continue
|
|
|
+** to be supported. However, new applications should avoid
|
|
|
+** the use of these functions. To encourage programmers to avoid
|
|
|
+** these functions, we will not explain what they do.
|
|
|
+*/
|
|
|
+#ifndef SQLITE_OMIT_DEPRECATED
|
|
|
+SQLITE_API SQLITE_DEPRECATED int sqlite3_aggregate_count(sqlite3_context*);
|
|
|
+SQLITE_API SQLITE_DEPRECATED int sqlite3_expired(sqlite3_stmt*);
|
|
|
+SQLITE_API SQLITE_DEPRECATED int sqlite3_transfer_bindings(sqlite3_stmt*, sqlite3_stmt*);
|
|
|
+SQLITE_API SQLITE_DEPRECATED int sqlite3_global_recover(void);
|
|
|
+SQLITE_API SQLITE_DEPRECATED void sqlite3_thread_cleanup(void);
|
|
|
+SQLITE_API SQLITE_DEPRECATED int sqlite3_memory_alarm(void(*)(void*,sqlite3_int64,int),
|
|
|
+ void*,sqlite3_int64);
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Obtaining SQL Values
|
|
|
+** METHOD: sqlite3_value
|
|
|
+**
|
|
|
+** <b>Summary:</b>
|
|
|
+** <blockquote><table border=0 cellpadding=0 cellspacing=0>
|
|
|
+** <tr><td><b>sqlite3_value_blob</b><td>→<td>BLOB value
|
|
|
+** <tr><td><b>sqlite3_value_double</b><td>→<td>REAL value
|
|
|
+** <tr><td><b>sqlite3_value_int</b><td>→<td>32-bit INTEGER value
|
|
|
+** <tr><td><b>sqlite3_value_int64</b><td>→<td>64-bit INTEGER value
|
|
|
+** <tr><td><b>sqlite3_value_pointer</b><td>→<td>Pointer value
|
|
|
+** <tr><td><b>sqlite3_value_text</b><td>→<td>UTF-8 TEXT value
|
|
|
+** <tr><td><b>sqlite3_value_text16</b><td>→<td>UTF-16 TEXT value in
|
|
|
+** the native byteorder
|
|
|
+** <tr><td><b>sqlite3_value_text16be</b><td>→<td>UTF-16be TEXT value
|
|
|
+** <tr><td><b>sqlite3_value_text16le</b><td>→<td>UTF-16le TEXT value
|
|
|
+** <tr><td> <td> <td>
|
|
|
+** <tr><td><b>sqlite3_value_bytes</b><td>→<td>Size of a BLOB
|
|
|
+** or a UTF-8 TEXT in bytes
|
|
|
+** <tr><td><b>sqlite3_value_bytes16 </b>
|
|
|
+** <td>→ <td>Size of UTF-16
|
|
|
+** TEXT in bytes
|
|
|
+** <tr><td><b>sqlite3_value_type</b><td>→<td>Default
|
|
|
+** datatype of the value
|
|
|
+** <tr><td><b>sqlite3_value_numeric_type </b>
|
|
|
+** <td>→ <td>Best numeric datatype of the value
|
|
|
+** <tr><td><b>sqlite3_value_nochange </b>
|
|
|
+** <td>→ <td>True if the column is unchanged in an UPDATE
|
|
|
+** against a virtual table.
|
|
|
+** <tr><td><b>sqlite3_value_frombind </b>
|
|
|
+** <td>→ <td>True if value originated from a [bound parameter]
|
|
|
+** </table></blockquote>
|
|
|
+**
|
|
|
+** <b>Details:</b>
|
|
|
+**
|
|
|
+** These routines extract type, size, and content information from
|
|
|
+** [protected sqlite3_value] objects. Protected sqlite3_value objects
|
|
|
+** are used to pass parameter information into the functions that
|
|
|
+** implement [application-defined SQL functions] and [virtual tables].
|
|
|
+**
|
|
|
+** These routines work only with [protected sqlite3_value] objects.
|
|
|
+** Any attempt to use these routines on an [unprotected sqlite3_value]
|
|
|
+** is not threadsafe.
|
|
|
+**
|
|
|
+** ^These routines work just like the corresponding [column access functions]
|
|
|
+** except that these routines take a single [protected sqlite3_value] object
|
|
|
+** pointer instead of a [sqlite3_stmt*] pointer and an integer column number.
|
|
|
+**
|
|
|
+** ^The sqlite3_value_text16() interface extracts a UTF-16 string
|
|
|
+** in the native byte-order of the host machine. ^The
|
|
|
+** sqlite3_value_text16be() and sqlite3_value_text16le() interfaces
|
|
|
+** extract UTF-16 strings as big-endian and little-endian respectively.
|
|
|
+**
|
|
|
+** ^If [sqlite3_value] object V was initialized
|
|
|
+** using [sqlite3_bind_pointer(S,I,P,X,D)] or [sqlite3_result_pointer(C,P,X,D)]
|
|
|
+** and if X and Y are strings that compare equal according to strcmp(X,Y),
|
|
|
+** then sqlite3_value_pointer(V,Y) will return the pointer P. ^Otherwise,
|
|
|
+** sqlite3_value_pointer(V,Y) returns a NULL. The sqlite3_bind_pointer()
|
|
|
+** routine is part of the [pointer passing interface] added for SQLite 3.20.0.
|
|
|
+**
|
|
|
+** ^(The sqlite3_value_type(V) interface returns the
|
|
|
+** [SQLITE_INTEGER | datatype code] for the initial datatype of the
|
|
|
+** [sqlite3_value] object V. The returned value is one of [SQLITE_INTEGER],
|
|
|
+** [SQLITE_FLOAT], [SQLITE_TEXT], [SQLITE_BLOB], or [SQLITE_NULL].)^
|
|
|
+** Other interfaces might change the datatype for an sqlite3_value object.
|
|
|
+** For example, if the datatype is initially SQLITE_INTEGER and
|
|
|
+** sqlite3_value_text(V) is called to extract a text value for that
|
|
|
+** integer, then subsequent calls to sqlite3_value_type(V) might return
|
|
|
+** SQLITE_TEXT. Whether or not a persistent internal datatype conversion
|
|
|
+** occurs is undefined and may change from one release of SQLite to the next.
|
|
|
+**
|
|
|
+** ^(The sqlite3_value_numeric_type() interface attempts to apply
|
|
|
+** numeric affinity to the value. This means that an attempt is
|
|
|
+** made to convert the value to an integer or floating point. If
|
|
|
+** such a conversion is possible without loss of information (in other
|
|
|
+** words, if the value is a string that looks like a number)
|
|
|
+** then the conversion is performed. Otherwise no conversion occurs.
|
|
|
+** The [SQLITE_INTEGER | datatype] after conversion is returned.)^
|
|
|
+**
|
|
|
+** ^Within the [xUpdate] method of a [virtual table], the
|
|
|
+** sqlite3_value_nochange(X) interface returns true if and only if
|
|
|
+** the column corresponding to X is unchanged by the UPDATE operation
|
|
|
+** that the xUpdate method call was invoked to implement and if
|
|
|
+** and the prior [xColumn] method call that was invoked to extracted
|
|
|
+** the value for that column returned without setting a result (probably
|
|
|
+** because it queried [sqlite3_vtab_nochange()] and found that the column
|
|
|
+** was unchanging). ^Within an [xUpdate] method, any value for which
|
|
|
+** sqlite3_value_nochange(X) is true will in all other respects appear
|
|
|
+** to be a NULL value. If sqlite3_value_nochange(X) is invoked anywhere other
|
|
|
+** than within an [xUpdate] method call for an UPDATE statement, then
|
|
|
+** the return value is arbitrary and meaningless.
|
|
|
+**
|
|
|
+** ^The sqlite3_value_frombind(X) interface returns non-zero if the
|
|
|
+** value X originated from one of the [sqlite3_bind_int|sqlite3_bind()]
|
|
|
+** interfaces. ^If X comes from an SQL literal value, or a table column,
|
|
|
+** or an expression, then sqlite3_value_frombind(X) returns zero.
|
|
|
+**
|
|
|
+** Please pay particular attention to the fact that the pointer returned
|
|
|
+** from [sqlite3_value_blob()], [sqlite3_value_text()], or
|
|
|
+** [sqlite3_value_text16()] can be invalidated by a subsequent call to
|
|
|
+** [sqlite3_value_bytes()], [sqlite3_value_bytes16()], [sqlite3_value_text()],
|
|
|
+** or [sqlite3_value_text16()].
|
|
|
+**
|
|
|
+** These routines must be called from the same thread as
|
|
|
+** the SQL function that supplied the [sqlite3_value*] parameters.
|
|
|
+**
|
|
|
+** As long as the input parameter is correct, these routines can only
|
|
|
+** fail if an out-of-memory error occurs during a format conversion.
|
|
|
+** Only the following subset of interfaces are subject to out-of-memory
|
|
|
+** errors:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> sqlite3_value_blob()
|
|
|
+** <li> sqlite3_value_text()
|
|
|
+** <li> sqlite3_value_text16()
|
|
|
+** <li> sqlite3_value_text16le()
|
|
|
+** <li> sqlite3_value_text16be()
|
|
|
+** <li> sqlite3_value_bytes()
|
|
|
+** <li> sqlite3_value_bytes16()
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** If an out-of-memory error occurs, then the return value from these
|
|
|
+** routines is the same as if the column had contained an SQL NULL value.
|
|
|
+** Valid SQL NULL returns can be distinguished from out-of-memory errors
|
|
|
+** by invoking the [sqlite3_errcode()] immediately after the suspect
|
|
|
+** return value is obtained and before any
|
|
|
+** other SQLite interface is called on the same [database connection].
|
|
|
+*/
|
|
|
+SQLITE_API const void *sqlite3_value_blob(sqlite3_value*);
|
|
|
+SQLITE_API double sqlite3_value_double(sqlite3_value*);
|
|
|
+SQLITE_API int sqlite3_value_int(sqlite3_value*);
|
|
|
+SQLITE_API sqlite3_int64 sqlite3_value_int64(sqlite3_value*);
|
|
|
+SQLITE_API void *sqlite3_value_pointer(sqlite3_value*, const char*);
|
|
|
+SQLITE_API const unsigned char *sqlite3_value_text(sqlite3_value*);
|
|
|
+SQLITE_API const void *sqlite3_value_text16(sqlite3_value*);
|
|
|
+SQLITE_API const void *sqlite3_value_text16le(sqlite3_value*);
|
|
|
+SQLITE_API const void *sqlite3_value_text16be(sqlite3_value*);
|
|
|
+SQLITE_API int sqlite3_value_bytes(sqlite3_value*);
|
|
|
+SQLITE_API int sqlite3_value_bytes16(sqlite3_value*);
|
|
|
+SQLITE_API int sqlite3_value_type(sqlite3_value*);
|
|
|
+SQLITE_API int sqlite3_value_numeric_type(sqlite3_value*);
|
|
|
+SQLITE_API int sqlite3_value_nochange(sqlite3_value*);
|
|
|
+SQLITE_API int sqlite3_value_frombind(sqlite3_value*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Finding The Subtype Of SQL Values
|
|
|
+** METHOD: sqlite3_value
|
|
|
+**
|
|
|
+** The sqlite3_value_subtype(V) function returns the subtype for
|
|
|
+** an [application-defined SQL function] argument V. The subtype
|
|
|
+** information can be used to pass a limited amount of context from
|
|
|
+** one SQL function to another. Use the [sqlite3_result_subtype()]
|
|
|
+** routine to set the subtype for the return value of an SQL function.
|
|
|
+*/
|
|
|
+SQLITE_API unsigned int sqlite3_value_subtype(sqlite3_value*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Copy And Free SQL Values
|
|
|
+** METHOD: sqlite3_value
|
|
|
+**
|
|
|
+** ^The sqlite3_value_dup(V) interface makes a copy of the [sqlite3_value]
|
|
|
+** object D and returns a pointer to that copy. ^The [sqlite3_value] returned
|
|
|
+** is a [protected sqlite3_value] object even if the input is not.
|
|
|
+** ^The sqlite3_value_dup(V) interface returns NULL if V is NULL or if a
|
|
|
+** memory allocation fails.
|
|
|
+**
|
|
|
+** ^The sqlite3_value_free(V) interface frees an [sqlite3_value] object
|
|
|
+** previously obtained from [sqlite3_value_dup()]. ^If V is a NULL pointer
|
|
|
+** then sqlite3_value_free(V) is a harmless no-op.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_value *sqlite3_value_dup(const sqlite3_value*);
|
|
|
+SQLITE_API void sqlite3_value_free(sqlite3_value*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Obtain Aggregate Function Context
|
|
|
+** METHOD: sqlite3_context
|
|
|
+**
|
|
|
+** Implementations of aggregate SQL functions use this
|
|
|
+** routine to allocate memory for storing their state.
|
|
|
+**
|
|
|
+** ^The first time the sqlite3_aggregate_context(C,N) routine is called
|
|
|
+** for a particular aggregate function, SQLite allocates
|
|
|
+** N bytes of memory, zeroes out that memory, and returns a pointer
|
|
|
+** to the new memory. ^On second and subsequent calls to
|
|
|
+** sqlite3_aggregate_context() for the same aggregate function instance,
|
|
|
+** the same buffer is returned. Sqlite3_aggregate_context() is normally
|
|
|
+** called once for each invocation of the xStep callback and then one
|
|
|
+** last time when the xFinal callback is invoked. ^(When no rows match
|
|
|
+** an aggregate query, the xStep() callback of the aggregate function
|
|
|
+** implementation is never called and xFinal() is called exactly once.
|
|
|
+** In those cases, sqlite3_aggregate_context() might be called for the
|
|
|
+** first time from within xFinal().)^
|
|
|
+**
|
|
|
+** ^The sqlite3_aggregate_context(C,N) routine returns a NULL pointer
|
|
|
+** when first called if N is less than or equal to zero or if a memory
|
|
|
+** allocate error occurs.
|
|
|
+**
|
|
|
+** ^(The amount of space allocated by sqlite3_aggregate_context(C,N) is
|
|
|
+** determined by the N parameter on first successful call. Changing the
|
|
|
+** value of N in any subsequent call to sqlite3_aggregate_context() within
|
|
|
+** the same aggregate function instance will not resize the memory
|
|
|
+** allocation.)^ Within the xFinal callback, it is customary to set
|
|
|
+** N=0 in calls to sqlite3_aggregate_context(C,N) so that no
|
|
|
+** pointless memory allocations occur.
|
|
|
+**
|
|
|
+** ^SQLite automatically frees the memory allocated by
|
|
|
+** sqlite3_aggregate_context() when the aggregate query concludes.
|
|
|
+**
|
|
|
+** The first parameter must be a copy of the
|
|
|
+** [sqlite3_context | SQL function context] that is the first parameter
|
|
|
+** to the xStep or xFinal callback routine that implements the aggregate
|
|
|
+** function.
|
|
|
+**
|
|
|
+** This routine must be called from the same thread in which
|
|
|
+** the aggregate SQL function is running.
|
|
|
+*/
|
|
|
+SQLITE_API void *sqlite3_aggregate_context(sqlite3_context*, int nBytes);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: User Data For Functions
|
|
|
+** METHOD: sqlite3_context
|
|
|
+**
|
|
|
+** ^The sqlite3_user_data() interface returns a copy of
|
|
|
+** the pointer that was the pUserData parameter (the 5th parameter)
|
|
|
+** of the [sqlite3_create_function()]
|
|
|
+** and [sqlite3_create_function16()] routines that originally
|
|
|
+** registered the application defined function.
|
|
|
+**
|
|
|
+** This routine must be called from the same thread in which
|
|
|
+** the application-defined function is running.
|
|
|
+*/
|
|
|
+SQLITE_API void *sqlite3_user_data(sqlite3_context*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Database Connection For Functions
|
|
|
+** METHOD: sqlite3_context
|
|
|
+**
|
|
|
+** ^The sqlite3_context_db_handle() interface returns a copy of
|
|
|
+** the pointer to the [database connection] (the 1st parameter)
|
|
|
+** of the [sqlite3_create_function()]
|
|
|
+** and [sqlite3_create_function16()] routines that originally
|
|
|
+** registered the application defined function.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3 *sqlite3_context_db_handle(sqlite3_context*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Function Auxiliary Data
|
|
|
+** METHOD: sqlite3_context
|
|
|
+**
|
|
|
+** These functions may be used by (non-aggregate) SQL functions to
|
|
|
+** associate metadata with argument values. If the same value is passed to
|
|
|
+** multiple invocations of the same SQL function during query execution, under
|
|
|
+** some circumstances the associated metadata may be preserved. An example
|
|
|
+** of where this might be useful is in a regular-expression matching
|
|
|
+** function. The compiled version of the regular expression can be stored as
|
|
|
+** metadata associated with the pattern string.
|
|
|
+** Then as long as the pattern string remains the same,
|
|
|
+** the compiled regular expression can be reused on multiple
|
|
|
+** invocations of the same function.
|
|
|
+**
|
|
|
+** ^The sqlite3_get_auxdata(C,N) interface returns a pointer to the metadata
|
|
|
+** associated by the sqlite3_set_auxdata(C,N,P,X) function with the Nth argument
|
|
|
+** value to the application-defined function. ^N is zero for the left-most
|
|
|
+** function argument. ^If there is no metadata
|
|
|
+** associated with the function argument, the sqlite3_get_auxdata(C,N) interface
|
|
|
+** returns a NULL pointer.
|
|
|
+**
|
|
|
+** ^The sqlite3_set_auxdata(C,N,P,X) interface saves P as metadata for the N-th
|
|
|
+** argument of the application-defined function. ^Subsequent
|
|
|
+** calls to sqlite3_get_auxdata(C,N) return P from the most recent
|
|
|
+** sqlite3_set_auxdata(C,N,P,X) call if the metadata is still valid or
|
|
|
+** NULL if the metadata has been discarded.
|
|
|
+** ^After each call to sqlite3_set_auxdata(C,N,P,X) where X is not NULL,
|
|
|
+** SQLite will invoke the destructor function X with parameter P exactly
|
|
|
+** once, when the metadata is discarded.
|
|
|
+** SQLite is free to discard the metadata at any time, including: <ul>
|
|
|
+** <li> ^(when the corresponding function parameter changes)^, or
|
|
|
+** <li> ^(when [sqlite3_reset()] or [sqlite3_finalize()] is called for the
|
|
|
+** SQL statement)^, or
|
|
|
+** <li> ^(when sqlite3_set_auxdata() is invoked again on the same
|
|
|
+** parameter)^, or
|
|
|
+** <li> ^(during the original sqlite3_set_auxdata() call when a memory
|
|
|
+** allocation error occurs.)^ </ul>
|
|
|
+**
|
|
|
+** Note the last bullet in particular. The destructor X in
|
|
|
+** sqlite3_set_auxdata(C,N,P,X) might be called immediately, before the
|
|
|
+** sqlite3_set_auxdata() interface even returns. Hence sqlite3_set_auxdata()
|
|
|
+** should be called near the end of the function implementation and the
|
|
|
+** function implementation should not make any use of P after
|
|
|
+** sqlite3_set_auxdata() has been called.
|
|
|
+**
|
|
|
+** ^(In practice, metadata is preserved between function calls for
|
|
|
+** function parameters that are compile-time constants, including literal
|
|
|
+** values and [parameters] and expressions composed from the same.)^
|
|
|
+**
|
|
|
+** The value of the N parameter to these interfaces should be non-negative.
|
|
|
+** Future enhancements may make use of negative N values to define new
|
|
|
+** kinds of function caching behavior.
|
|
|
+**
|
|
|
+** These routines must be called from the same thread in which
|
|
|
+** the SQL function is running.
|
|
|
+*/
|
|
|
+SQLITE_API void *sqlite3_get_auxdata(sqlite3_context*, int N);
|
|
|
+SQLITE_API void sqlite3_set_auxdata(sqlite3_context*, int N, void*, void (*)(void*));
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Constants Defining Special Destructor Behavior
|
|
|
+**
|
|
|
+** These are special values for the destructor that is passed in as the
|
|
|
+** final argument to routines like [sqlite3_result_blob()]. ^If the destructor
|
|
|
+** argument is SQLITE_STATIC, it means that the content pointer is constant
|
|
|
+** and will never change. It does not need to be destroyed. ^The
|
|
|
+** SQLITE_TRANSIENT value means that the content will likely change in
|
|
|
+** the near future and that SQLite should make its own private copy of
|
|
|
+** the content before returning.
|
|
|
+**
|
|
|
+** The typedef is necessary to work around problems in certain
|
|
|
+** C++ compilers.
|
|
|
+*/
|
|
|
+typedef void (*sqlite3_destructor_type)(void*);
|
|
|
+#define SQLITE_STATIC ((sqlite3_destructor_type)0)
|
|
|
+#define SQLITE_TRANSIENT ((sqlite3_destructor_type)-1)
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Setting The Result Of An SQL Function
|
|
|
+** METHOD: sqlite3_context
|
|
|
+**
|
|
|
+** These routines are used by the xFunc or xFinal callbacks that
|
|
|
+** implement SQL functions and aggregates. See
|
|
|
+** [sqlite3_create_function()] and [sqlite3_create_function16()]
|
|
|
+** for additional information.
|
|
|
+**
|
|
|
+** These functions work very much like the [parameter binding] family of
|
|
|
+** functions used to bind values to host parameters in prepared statements.
|
|
|
+** Refer to the [SQL parameter] documentation for additional information.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_blob() interface sets the result from
|
|
|
+** an application-defined function to be the BLOB whose content is pointed
|
|
|
+** to by the second parameter and which is N bytes long where N is the
|
|
|
+** third parameter.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_zeroblob(C,N) and sqlite3_result_zeroblob64(C,N)
|
|
|
+** interfaces set the result of the application-defined function to be
|
|
|
+** a BLOB containing all zero bytes and N bytes in size.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_double() interface sets the result from
|
|
|
+** an application-defined function to be a floating point value specified
|
|
|
+** by its 2nd argument.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_error() and sqlite3_result_error16() functions
|
|
|
+** cause the implemented SQL function to throw an exception.
|
|
|
+** ^SQLite uses the string pointed to by the
|
|
|
+** 2nd parameter of sqlite3_result_error() or sqlite3_result_error16()
|
|
|
+** as the text of an error message. ^SQLite interprets the error
|
|
|
+** message string from sqlite3_result_error() as UTF-8. ^SQLite
|
|
|
+** interprets the string from sqlite3_result_error16() as UTF-16 using
|
|
|
+** the same [byte-order determination rules] as [sqlite3_bind_text16()].
|
|
|
+** ^If the third parameter to sqlite3_result_error()
|
|
|
+** or sqlite3_result_error16() is negative then SQLite takes as the error
|
|
|
+** message all text up through the first zero character.
|
|
|
+** ^If the third parameter to sqlite3_result_error() or
|
|
|
+** sqlite3_result_error16() is non-negative then SQLite takes that many
|
|
|
+** bytes (not characters) from the 2nd parameter as the error message.
|
|
|
+** ^The sqlite3_result_error() and sqlite3_result_error16()
|
|
|
+** routines make a private copy of the error message text before
|
|
|
+** they return. Hence, the calling function can deallocate or
|
|
|
+** modify the text after they return without harm.
|
|
|
+** ^The sqlite3_result_error_code() function changes the error code
|
|
|
+** returned by SQLite as a result of an error in a function. ^By default,
|
|
|
+** the error code is SQLITE_ERROR. ^A subsequent call to sqlite3_result_error()
|
|
|
+** or sqlite3_result_error16() resets the error code to SQLITE_ERROR.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_error_toobig() interface causes SQLite to throw an
|
|
|
+** error indicating that a string or BLOB is too long to represent.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_error_nomem() interface causes SQLite to throw an
|
|
|
+** error indicating that a memory allocation failed.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_int() interface sets the return value
|
|
|
+** of the application-defined function to be the 32-bit signed integer
|
|
|
+** value given in the 2nd argument.
|
|
|
+** ^The sqlite3_result_int64() interface sets the return value
|
|
|
+** of the application-defined function to be the 64-bit signed integer
|
|
|
+** value given in the 2nd argument.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_null() interface sets the return value
|
|
|
+** of the application-defined function to be NULL.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_text(), sqlite3_result_text16(),
|
|
|
+** sqlite3_result_text16le(), and sqlite3_result_text16be() interfaces
|
|
|
+** set the return value of the application-defined function to be
|
|
|
+** a text string which is represented as UTF-8, UTF-16 native byte order,
|
|
|
+** UTF-16 little endian, or UTF-16 big endian, respectively.
|
|
|
+** ^The sqlite3_result_text64() interface sets the return value of an
|
|
|
+** application-defined function to be a text string in an encoding
|
|
|
+** specified by the fifth (and last) parameter, which must be one
|
|
|
+** of [SQLITE_UTF8], [SQLITE_UTF16], [SQLITE_UTF16BE], or [SQLITE_UTF16LE].
|
|
|
+** ^SQLite takes the text result from the application from
|
|
|
+** the 2nd parameter of the sqlite3_result_text* interfaces.
|
|
|
+** ^If the 3rd parameter to the sqlite3_result_text* interfaces
|
|
|
+** is negative, then SQLite takes result text from the 2nd parameter
|
|
|
+** through the first zero character.
|
|
|
+** ^If the 3rd parameter to the sqlite3_result_text* interfaces
|
|
|
+** is non-negative, then as many bytes (not characters) of the text
|
|
|
+** pointed to by the 2nd parameter are taken as the application-defined
|
|
|
+** function result. If the 3rd parameter is non-negative, then it
|
|
|
+** must be the byte offset into the string where the NUL terminator would
|
|
|
+** appear if the string where NUL terminated. If any NUL characters occur
|
|
|
+** in the string at a byte offset that is less than the value of the 3rd
|
|
|
+** parameter, then the resulting string will contain embedded NULs and the
|
|
|
+** result of expressions operating on strings with embedded NULs is undefined.
|
|
|
+** ^If the 4th parameter to the sqlite3_result_text* interfaces
|
|
|
+** or sqlite3_result_blob is a non-NULL pointer, then SQLite calls that
|
|
|
+** function as the destructor on the text or BLOB result when it has
|
|
|
+** finished using that result.
|
|
|
+** ^If the 4th parameter to the sqlite3_result_text* interfaces or to
|
|
|
+** sqlite3_result_blob is the special constant SQLITE_STATIC, then SQLite
|
|
|
+** assumes that the text or BLOB result is in constant space and does not
|
|
|
+** copy the content of the parameter nor call a destructor on the content
|
|
|
+** when it has finished using that result.
|
|
|
+** ^If the 4th parameter to the sqlite3_result_text* interfaces
|
|
|
+** or sqlite3_result_blob is the special constant SQLITE_TRANSIENT
|
|
|
+** then SQLite makes a copy of the result into space obtained
|
|
|
+** from [sqlite3_malloc()] before it returns.
|
|
|
+**
|
|
|
+** ^For the sqlite3_result_text16(), sqlite3_result_text16le(), and
|
|
|
+** sqlite3_result_text16be() routines, and for sqlite3_result_text64()
|
|
|
+** when the encoding is not UTF8, if the input UTF16 begins with a
|
|
|
+** byte-order mark (BOM, U+FEFF) then the BOM is removed from the
|
|
|
+** string and the rest of the string is interpreted according to the
|
|
|
+** byte-order specified by the BOM. ^The byte-order specified by
|
|
|
+** the BOM at the beginning of the text overrides the byte-order
|
|
|
+** specified by the interface procedure. ^So, for example, if
|
|
|
+** sqlite3_result_text16le() is invoked with text that begins
|
|
|
+** with bytes 0xfe, 0xff (a big-endian byte-order mark) then the
|
|
|
+** first two bytes of input are skipped and the remaining input
|
|
|
+** is interpreted as UTF16BE text.
|
|
|
+**
|
|
|
+** ^For UTF16 input text to the sqlite3_result_text16(),
|
|
|
+** sqlite3_result_text16be(), sqlite3_result_text16le(), and
|
|
|
+** sqlite3_result_text64() routines, if the text contains invalid
|
|
|
+** UTF16 characters, the invalid characters might be converted
|
|
|
+** into the unicode replacement character, U+FFFD.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_value() interface sets the result of
|
|
|
+** the application-defined function to be a copy of the
|
|
|
+** [unprotected sqlite3_value] object specified by the 2nd parameter. ^The
|
|
|
+** sqlite3_result_value() interface makes a copy of the [sqlite3_value]
|
|
|
+** so that the [sqlite3_value] specified in the parameter may change or
|
|
|
+** be deallocated after sqlite3_result_value() returns without harm.
|
|
|
+** ^A [protected sqlite3_value] object may always be used where an
|
|
|
+** [unprotected sqlite3_value] object is required, so either
|
|
|
+** kind of [sqlite3_value] object can be used with this interface.
|
|
|
+**
|
|
|
+** ^The sqlite3_result_pointer(C,P,T,D) interface sets the result to an
|
|
|
+** SQL NULL value, just like [sqlite3_result_null(C)], except that it
|
|
|
+** also associates the host-language pointer P or type T with that
|
|
|
+** NULL value such that the pointer can be retrieved within an
|
|
|
+** [application-defined SQL function] using [sqlite3_value_pointer()].
|
|
|
+** ^If the D parameter is not NULL, then it is a pointer to a destructor
|
|
|
+** for the P parameter. ^SQLite invokes D with P as its only argument
|
|
|
+** when SQLite is finished with P. The T parameter should be a static
|
|
|
+** string and preferably a string literal. The sqlite3_result_pointer()
|
|
|
+** routine is part of the [pointer passing interface] added for SQLite 3.20.0.
|
|
|
+**
|
|
|
+** If these routines are called from within the different thread
|
|
|
+** than the one containing the application-defined function that received
|
|
|
+** the [sqlite3_context] pointer, the results are undefined.
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_result_blob(sqlite3_context*, const void*, int, void(*)(void*));
|
|
|
+SQLITE_API void sqlite3_result_blob64(sqlite3_context*,const void*,
|
|
|
+ sqlite3_uint64,void(*)(void*));
|
|
|
+SQLITE_API void sqlite3_result_double(sqlite3_context*, double);
|
|
|
+SQLITE_API void sqlite3_result_error(sqlite3_context*, const char*, int);
|
|
|
+SQLITE_API void sqlite3_result_error16(sqlite3_context*, const void*, int);
|
|
|
+SQLITE_API void sqlite3_result_error_toobig(sqlite3_context*);
|
|
|
+SQLITE_API void sqlite3_result_error_nomem(sqlite3_context*);
|
|
|
+SQLITE_API void sqlite3_result_error_code(sqlite3_context*, int);
|
|
|
+SQLITE_API void sqlite3_result_int(sqlite3_context*, int);
|
|
|
+SQLITE_API void sqlite3_result_int64(sqlite3_context*, sqlite3_int64);
|
|
|
+SQLITE_API void sqlite3_result_null(sqlite3_context*);
|
|
|
+SQLITE_API void sqlite3_result_text(sqlite3_context*, const char*, int, void(*)(void*));
|
|
|
+SQLITE_API void sqlite3_result_text64(sqlite3_context*, const char*,sqlite3_uint64,
|
|
|
+ void(*)(void*), unsigned char encoding);
|
|
|
+SQLITE_API void sqlite3_result_text16(sqlite3_context*, const void*, int, void(*)(void*));
|
|
|
+SQLITE_API void sqlite3_result_text16le(sqlite3_context*, const void*, int,void(*)(void*));
|
|
|
+SQLITE_API void sqlite3_result_text16be(sqlite3_context*, const void*, int,void(*)(void*));
|
|
|
+SQLITE_API void sqlite3_result_value(sqlite3_context*, sqlite3_value*);
|
|
|
+SQLITE_API void sqlite3_result_pointer(sqlite3_context*, void*,const char*,void(*)(void*));
|
|
|
+SQLITE_API void sqlite3_result_zeroblob(sqlite3_context*, int n);
|
|
|
+SQLITE_API int sqlite3_result_zeroblob64(sqlite3_context*, sqlite3_uint64 n);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Setting The Subtype Of An SQL Function
|
|
|
+** METHOD: sqlite3_context
|
|
|
+**
|
|
|
+** The sqlite3_result_subtype(C,T) function causes the subtype of
|
|
|
+** the result from the [application-defined SQL function] with
|
|
|
+** [sqlite3_context] C to be the value T. Only the lower 8 bits
|
|
|
+** of the subtype T are preserved in current versions of SQLite;
|
|
|
+** higher order bits are discarded.
|
|
|
+** The number of subtype bytes preserved by SQLite might increase
|
|
|
+** in future releases of SQLite.
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_result_subtype(sqlite3_context*,unsigned int);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Define New Collating Sequences
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^These functions add, remove, or modify a [collation] associated
|
|
|
+** with the [database connection] specified as the first argument.
|
|
|
+**
|
|
|
+** ^The name of the collation is a UTF-8 string
|
|
|
+** for sqlite3_create_collation() and sqlite3_create_collation_v2()
|
|
|
+** and a UTF-16 string in native byte order for sqlite3_create_collation16().
|
|
|
+** ^Collation names that compare equal according to [sqlite3_strnicmp()] are
|
|
|
+** considered to be the same name.
|
|
|
+**
|
|
|
+** ^(The third argument (eTextRep) must be one of the constants:
|
|
|
+** <ul>
|
|
|
+** <li> [SQLITE_UTF8],
|
|
|
+** <li> [SQLITE_UTF16LE],
|
|
|
+** <li> [SQLITE_UTF16BE],
|
|
|
+** <li> [SQLITE_UTF16], or
|
|
|
+** <li> [SQLITE_UTF16_ALIGNED].
|
|
|
+** </ul>)^
|
|
|
+** ^The eTextRep argument determines the encoding of strings passed
|
|
|
+** to the collating function callback, xCompare.
|
|
|
+** ^The [SQLITE_UTF16] and [SQLITE_UTF16_ALIGNED] values for eTextRep
|
|
|
+** force strings to be UTF16 with native byte order.
|
|
|
+** ^The [SQLITE_UTF16_ALIGNED] value for eTextRep forces strings to begin
|
|
|
+** on an even byte address.
|
|
|
+**
|
|
|
+** ^The fourth argument, pArg, is an application data pointer that is passed
|
|
|
+** through as the first argument to the collating function callback.
|
|
|
+**
|
|
|
+** ^The fifth argument, xCompare, is a pointer to the collating function.
|
|
|
+** ^Multiple collating functions can be registered using the same name but
|
|
|
+** with different eTextRep parameters and SQLite will use whichever
|
|
|
+** function requires the least amount of data transformation.
|
|
|
+** ^If the xCompare argument is NULL then the collating function is
|
|
|
+** deleted. ^When all collating functions having the same name are deleted,
|
|
|
+** that collation is no longer usable.
|
|
|
+**
|
|
|
+** ^The collating function callback is invoked with a copy of the pArg
|
|
|
+** application data pointer and with two strings in the encoding specified
|
|
|
+** by the eTextRep argument. The two integer parameters to the collating
|
|
|
+** function callback are the length of the two strings, in bytes. The collating
|
|
|
+** function must return an integer that is negative, zero, or positive
|
|
|
+** if the first string is less than, equal to, or greater than the second,
|
|
|
+** respectively. A collating function must always return the same answer
|
|
|
+** given the same inputs. If two or more collating functions are registered
|
|
|
+** to the same collation name (using different eTextRep values) then all
|
|
|
+** must give an equivalent answer when invoked with equivalent strings.
|
|
|
+** The collating function must obey the following properties for all
|
|
|
+** strings A, B, and C:
|
|
|
+**
|
|
|
+** <ol>
|
|
|
+** <li> If A==B then B==A.
|
|
|
+** <li> If A==B and B==C then A==C.
|
|
|
+** <li> If A<B THEN B>A.
|
|
|
+** <li> If A<B and B<C then A<C.
|
|
|
+** </ol>
|
|
|
+**
|
|
|
+** If a collating function fails any of the above constraints and that
|
|
|
+** collating function is registered and used, then the behavior of SQLite
|
|
|
+** is undefined.
|
|
|
+**
|
|
|
+** ^The sqlite3_create_collation_v2() works like sqlite3_create_collation()
|
|
|
+** with the addition that the xDestroy callback is invoked on pArg when
|
|
|
+** the collating function is deleted.
|
|
|
+** ^Collating functions are deleted when they are overridden by later
|
|
|
+** calls to the collation creation functions or when the
|
|
|
+** [database connection] is closed using [sqlite3_close()].
|
|
|
+**
|
|
|
+** ^The xDestroy callback is <u>not</u> called if the
|
|
|
+** sqlite3_create_collation_v2() function fails. Applications that invoke
|
|
|
+** sqlite3_create_collation_v2() with a non-NULL xDestroy argument should
|
|
|
+** check the return code and dispose of the application data pointer
|
|
|
+** themselves rather than expecting SQLite to deal with it for them.
|
|
|
+** This is different from every other SQLite interface. The inconsistency
|
|
|
+** is unfortunate but cannot be changed without breaking backwards
|
|
|
+** compatibility.
|
|
|
+**
|
|
|
+** See also: [sqlite3_collation_needed()] and [sqlite3_collation_needed16()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_create_collation(
|
|
|
+ sqlite3*,
|
|
|
+ const char *zName,
|
|
|
+ int eTextRep,
|
|
|
+ void *pArg,
|
|
|
+ int(*xCompare)(void*,int,const void*,int,const void*)
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_create_collation_v2(
|
|
|
+ sqlite3*,
|
|
|
+ const char *zName,
|
|
|
+ int eTextRep,
|
|
|
+ void *pArg,
|
|
|
+ int(*xCompare)(void*,int,const void*,int,const void*),
|
|
|
+ void(*xDestroy)(void*)
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_create_collation16(
|
|
|
+ sqlite3*,
|
|
|
+ const void *zName,
|
|
|
+ int eTextRep,
|
|
|
+ void *pArg,
|
|
|
+ int(*xCompare)(void*,int,const void*,int,const void*)
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Collation Needed Callbacks
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^To avoid having to register all collation sequences before a database
|
|
|
+** can be used, a single callback function may be registered with the
|
|
|
+** [database connection] to be invoked whenever an undefined collation
|
|
|
+** sequence is required.
|
|
|
+**
|
|
|
+** ^If the function is registered using the sqlite3_collation_needed() API,
|
|
|
+** then it is passed the names of undefined collation sequences as strings
|
|
|
+** encoded in UTF-8. ^If sqlite3_collation_needed16() is used,
|
|
|
+** the names are passed as UTF-16 in machine native byte order.
|
|
|
+** ^A call to either function replaces the existing collation-needed callback.
|
|
|
+**
|
|
|
+** ^(When the callback is invoked, the first argument passed is a copy
|
|
|
+** of the second argument to sqlite3_collation_needed() or
|
|
|
+** sqlite3_collation_needed16(). The second argument is the database
|
|
|
+** connection. The third argument is one of [SQLITE_UTF8], [SQLITE_UTF16BE],
|
|
|
+** or [SQLITE_UTF16LE], indicating the most desirable form of the collation
|
|
|
+** sequence function required. The fourth parameter is the name of the
|
|
|
+** required collation sequence.)^
|
|
|
+**
|
|
|
+** The callback function should register the desired collation using
|
|
|
+** [sqlite3_create_collation()], [sqlite3_create_collation16()], or
|
|
|
+** [sqlite3_create_collation_v2()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_collation_needed(
|
|
|
+ sqlite3*,
|
|
|
+ void*,
|
|
|
+ void(*)(void*,sqlite3*,int eTextRep,const char*)
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_collation_needed16(
|
|
|
+ sqlite3*,
|
|
|
+ void*,
|
|
|
+ void(*)(void*,sqlite3*,int eTextRep,const void*)
|
|
|
+);
|
|
|
+
|
|
|
+#ifdef SQLITE_ENABLE_CEROD
|
|
|
+/*
|
|
|
+** Specify the activation key for a CEROD database. Unless
|
|
|
+** activated, none of the CEROD routines will work.
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_activate_cerod(
|
|
|
+ const char *zPassPhrase /* Activation phrase */
|
|
|
+);
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Suspend Execution For A Short Time
|
|
|
+**
|
|
|
+** The sqlite3_sleep() function causes the current thread to suspend execution
|
|
|
+** for at least a number of milliseconds specified in its parameter.
|
|
|
+**
|
|
|
+** If the operating system does not support sleep requests with
|
|
|
+** millisecond time resolution, then the time will be rounded up to
|
|
|
+** the nearest second. The number of milliseconds of sleep actually
|
|
|
+** requested from the operating system is returned.
|
|
|
+**
|
|
|
+** ^SQLite implements this interface by calling the xSleep()
|
|
|
+** method of the default [sqlite3_vfs] object. If the xSleep() method
|
|
|
+** of the default VFS is not implemented correctly, or not implemented at
|
|
|
+** all, then the behavior of sqlite3_sleep() may deviate from the description
|
|
|
+** in the previous paragraphs.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_sleep(int);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Name Of The Folder Holding Temporary Files
|
|
|
+**
|
|
|
+** ^(If this global variable is made to point to a string which is
|
|
|
+** the name of a folder (a.k.a. directory), then all temporary files
|
|
|
+** created by SQLite when using a built-in [sqlite3_vfs | VFS]
|
|
|
+** will be placed in that directory.)^ ^If this variable
|
|
|
+** is a NULL pointer, then SQLite performs a search for an appropriate
|
|
|
+** temporary file directory.
|
|
|
+**
|
|
|
+** Applications are strongly discouraged from using this global variable.
|
|
|
+** It is required to set a temporary folder on Windows Runtime (WinRT).
|
|
|
+** But for all other platforms, it is highly recommended that applications
|
|
|
+** neither read nor write this variable. This global variable is a relic
|
|
|
+** that exists for backwards compatibility of legacy applications and should
|
|
|
+** be avoided in new projects.
|
|
|
+**
|
|
|
+** It is not safe to read or modify this variable in more than one
|
|
|
+** thread at a time. It is not safe to read or modify this variable
|
|
|
+** if a [database connection] is being used at the same time in a separate
|
|
|
+** thread.
|
|
|
+** It is intended that this variable be set once
|
|
|
+** as part of process initialization and before any SQLite interface
|
|
|
+** routines have been called and that this variable remain unchanged
|
|
|
+** thereafter.
|
|
|
+**
|
|
|
+** ^The [temp_store_directory pragma] may modify this variable and cause
|
|
|
+** it to point to memory obtained from [sqlite3_malloc]. ^Furthermore,
|
|
|
+** the [temp_store_directory pragma] always assumes that any string
|
|
|
+** that this variable points to is held in memory obtained from
|
|
|
+** [sqlite3_malloc] and the pragma may attempt to free that memory
|
|
|
+** using [sqlite3_free].
|
|
|
+** Hence, if this variable is modified directly, either it should be
|
|
|
+** made NULL or made to point to memory obtained from [sqlite3_malloc]
|
|
|
+** or else the use of the [temp_store_directory pragma] should be avoided.
|
|
|
+** Except when requested by the [temp_store_directory pragma], SQLite
|
|
|
+** does not free the memory that sqlite3_temp_directory points to. If
|
|
|
+** the application wants that memory to be freed, it must do
|
|
|
+** so itself, taking care to only do so after all [database connection]
|
|
|
+** objects have been destroyed.
|
|
|
+**
|
|
|
+** <b>Note to Windows Runtime users:</b> The temporary directory must be set
|
|
|
+** prior to calling [sqlite3_open] or [sqlite3_open_v2]. Otherwise, various
|
|
|
+** features that require the use of temporary files may fail. Here is an
|
|
|
+** example of how to do this using C++ with the Windows Runtime:
|
|
|
+**
|
|
|
+** <blockquote><pre>
|
|
|
+** LPCWSTR zPath = Windows::Storage::ApplicationData::Current->
|
|
|
+** TemporaryFolder->Path->Data();
|
|
|
+** char zPathBuf[MAX_PATH + 1];
|
|
|
+** memset(zPathBuf, 0, sizeof(zPathBuf));
|
|
|
+** WideCharToMultiByte(CP_UTF8, 0, zPath, -1, zPathBuf, sizeof(zPathBuf),
|
|
|
+** NULL, NULL);
|
|
|
+** sqlite3_temp_directory = sqlite3_mprintf("%s", zPathBuf);
|
|
|
+** </pre></blockquote>
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_EXTERN char *sqlite3_temp_directory;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Name Of The Folder Holding Database Files
|
|
|
+**
|
|
|
+** ^(If this global variable is made to point to a string which is
|
|
|
+** the name of a folder (a.k.a. directory), then all database files
|
|
|
+** specified with a relative pathname and created or accessed by
|
|
|
+** SQLite when using a built-in windows [sqlite3_vfs | VFS] will be assumed
|
|
|
+** to be relative to that directory.)^ ^If this variable is a NULL
|
|
|
+** pointer, then SQLite assumes that all database files specified
|
|
|
+** with a relative pathname are relative to the current directory
|
|
|
+** for the process. Only the windows VFS makes use of this global
|
|
|
+** variable; it is ignored by the unix VFS.
|
|
|
+**
|
|
|
+** Changing the value of this variable while a database connection is
|
|
|
+** open can result in a corrupt database.
|
|
|
+**
|
|
|
+** It is not safe to read or modify this variable in more than one
|
|
|
+** thread at a time. It is not safe to read or modify this variable
|
|
|
+** if a [database connection] is being used at the same time in a separate
|
|
|
+** thread.
|
|
|
+** It is intended that this variable be set once
|
|
|
+** as part of process initialization and before any SQLite interface
|
|
|
+** routines have been called and that this variable remain unchanged
|
|
|
+** thereafter.
|
|
|
+**
|
|
|
+** ^The [data_store_directory pragma] may modify this variable and cause
|
|
|
+** it to point to memory obtained from [sqlite3_malloc]. ^Furthermore,
|
|
|
+** the [data_store_directory pragma] always assumes that any string
|
|
|
+** that this variable points to is held in memory obtained from
|
|
|
+** [sqlite3_malloc] and the pragma may attempt to free that memory
|
|
|
+** using [sqlite3_free].
|
|
|
+** Hence, if this variable is modified directly, either it should be
|
|
|
+** made NULL or made to point to memory obtained from [sqlite3_malloc]
|
|
|
+** or else the use of the [data_store_directory pragma] should be avoided.
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_EXTERN char *sqlite3_data_directory;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Win32 Specific Interface
|
|
|
+**
|
|
|
+** These interfaces are available only on Windows. The
|
|
|
+** [sqlite3_win32_set_directory] interface is used to set the value associated
|
|
|
+** with the [sqlite3_temp_directory] or [sqlite3_data_directory] variable, to
|
|
|
+** zValue, depending on the value of the type parameter. The zValue parameter
|
|
|
+** should be NULL to cause the previous value to be freed via [sqlite3_free];
|
|
|
+** a non-NULL value will be copied into memory obtained from [sqlite3_malloc]
|
|
|
+** prior to being used. The [sqlite3_win32_set_directory] interface returns
|
|
|
+** [SQLITE_OK] to indicate success, [SQLITE_ERROR] if the type is unsupported,
|
|
|
+** or [SQLITE_NOMEM] if memory could not be allocated. The value of the
|
|
|
+** [sqlite3_data_directory] variable is intended to act as a replacement for
|
|
|
+** the current directory on the sub-platforms of Win32 where that concept is
|
|
|
+** not present, e.g. WinRT and UWP. The [sqlite3_win32_set_directory8] and
|
|
|
+** [sqlite3_win32_set_directory16] interfaces behave exactly the same as the
|
|
|
+** sqlite3_win32_set_directory interface except the string parameter must be
|
|
|
+** UTF-8 or UTF-16, respectively.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_win32_set_directory(
|
|
|
+ unsigned long type, /* Identifier for directory being set or reset */
|
|
|
+ void *zValue /* New value for directory being set or reset */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_win32_set_directory8(unsigned long type, const char *zValue);
|
|
|
+SQLITE_API int sqlite3_win32_set_directory16(unsigned long type, const void *zValue);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Win32 Directory Types
|
|
|
+**
|
|
|
+** These macros are only available on Windows. They define the allowed values
|
|
|
+** for the type argument to the [sqlite3_win32_set_directory] interface.
|
|
|
+*/
|
|
|
+#define SQLITE_WIN32_DATA_DIRECTORY_TYPE 1
|
|
|
+#define SQLITE_WIN32_TEMP_DIRECTORY_TYPE 2
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Test For Auto-Commit Mode
|
|
|
+** KEYWORDS: {autocommit mode}
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_get_autocommit() interface returns non-zero or
|
|
|
+** zero if the given database connection is or is not in autocommit mode,
|
|
|
+** respectively. ^Autocommit mode is on by default.
|
|
|
+** ^Autocommit mode is disabled by a [BEGIN] statement.
|
|
|
+** ^Autocommit mode is re-enabled by a [COMMIT] or [ROLLBACK].
|
|
|
+**
|
|
|
+** If certain kinds of errors occur on a statement within a multi-statement
|
|
|
+** transaction (errors including [SQLITE_FULL], [SQLITE_IOERR],
|
|
|
+** [SQLITE_NOMEM], [SQLITE_BUSY], and [SQLITE_INTERRUPT]) then the
|
|
|
+** transaction might be rolled back automatically. The only way to
|
|
|
+** find out whether SQLite automatically rolled back the transaction after
|
|
|
+** an error is to use this function.
|
|
|
+**
|
|
|
+** If another thread changes the autocommit status of the database
|
|
|
+** connection while this routine is running, then the return value
|
|
|
+** is undefined.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_get_autocommit(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Find The Database Handle Of A Prepared Statement
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^The sqlite3_db_handle interface returns the [database connection] handle
|
|
|
+** to which a [prepared statement] belongs. ^The [database connection]
|
|
|
+** returned by sqlite3_db_handle is the same [database connection]
|
|
|
+** that was the first argument
|
|
|
+** to the [sqlite3_prepare_v2()] call (or its variants) that was used to
|
|
|
+** create the statement in the first place.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3 *sqlite3_db_handle(sqlite3_stmt*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Return The Filename For A Database Connection
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_db_filename(D,N) interface returns a pointer to the filename
|
|
|
+** associated with database N of connection D.
|
|
|
+** ^If there is no attached database N on the database
|
|
|
+** connection D, or if database N is a temporary or in-memory database, then
|
|
|
+** this function will return either a NULL pointer or an empty string.
|
|
|
+**
|
|
|
+** ^The string value returned by this routine is owned and managed by
|
|
|
+** the database connection. ^The value will be valid until the database N
|
|
|
+** is [DETACH]-ed or until the database connection closes.
|
|
|
+**
|
|
|
+** ^The filename returned by this function is the output of the
|
|
|
+** xFullPathname method of the [VFS]. ^In other words, the filename
|
|
|
+** will be an absolute pathname, even if the filename used
|
|
|
+** to open the database originally was a URI or relative pathname.
|
|
|
+**
|
|
|
+** If the filename pointer returned by this routine is not NULL, then it
|
|
|
+** can be used as the filename input parameter to these routines:
|
|
|
+** <ul>
|
|
|
+** <li> [sqlite3_uri_parameter()]
|
|
|
+** <li> [sqlite3_uri_boolean()]
|
|
|
+** <li> [sqlite3_uri_int64()]
|
|
|
+** <li> [sqlite3_filename_database()]
|
|
|
+** <li> [sqlite3_filename_journal()]
|
|
|
+** <li> [sqlite3_filename_wal()]
|
|
|
+** </ul>
|
|
|
+*/
|
|
|
+SQLITE_API const char *sqlite3_db_filename(sqlite3 *db, const char *zDbName);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Determine if a database is read-only
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_db_readonly(D,N) interface returns 1 if the database N
|
|
|
+** of connection D is read-only, 0 if it is read/write, or -1 if N is not
|
|
|
+** the name of a database on connection D.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_db_readonly(sqlite3 *db, const char *zDbName);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Determine the transaction state of a database
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_txn_state(D,S) interface returns the current
|
|
|
+** [transaction state] of schema S in database connection D. ^If S is NULL,
|
|
|
+** then the highest transaction state of any schema on database connection D
|
|
|
+** is returned. Transaction states are (in order of lowest to highest):
|
|
|
+** <ol>
|
|
|
+** <li value="0"> SQLITE_TXN_NONE
|
|
|
+** <li value="1"> SQLITE_TXN_READ
|
|
|
+** <li value="2"> SQLITE_TXN_WRITE
|
|
|
+** </ol>
|
|
|
+** ^If the S argument to sqlite3_txn_state(D,S) is not the name of
|
|
|
+** a valid schema, then -1 is returned.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_txn_state(sqlite3*,const char *zSchema);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Allowed return values from [sqlite3_txn_state()]
|
|
|
+** KEYWORDS: {transaction state}
|
|
|
+**
|
|
|
+** These constants define the current transaction state of a database file.
|
|
|
+** ^The [sqlite3_txn_state(D,S)] interface returns one of these
|
|
|
+** constants in order to describe the transaction state of schema S
|
|
|
+** in [database connection] D.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_TXN_NONE]] <dt>SQLITE_TXN_NONE</dt>
|
|
|
+** <dd>The SQLITE_TXN_NONE state means that no transaction is currently
|
|
|
+** pending.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_TXN_READ]] <dt>SQLITE_TXN_READ</dt>
|
|
|
+** <dd>The SQLITE_TXN_READ state means that the database is currently
|
|
|
+** in a read transaction. Content has been read from the database file
|
|
|
+** but nothing in the database file has changed. The transaction state
|
|
|
+** will advanced to SQLITE_TXN_WRITE if any changes occur and there are
|
|
|
+** no other conflicting concurrent write transactions. The transaction
|
|
|
+** state will revert to SQLITE_TXN_NONE following a [ROLLBACK] or
|
|
|
+** [COMMIT].</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_TXN_WRITE]] <dt>SQLITE_TXN_WRITE</dt>
|
|
|
+** <dd>The SQLITE_TXN_WRITE state means that the database is currently
|
|
|
+** in a write transaction. Content has been written to the database file
|
|
|
+** but has not yet committed. The transaction state will change to
|
|
|
+** to SQLITE_TXN_NONE at the next [ROLLBACK] or [COMMIT].</dd>
|
|
|
+*/
|
|
|
+#define SQLITE_TXN_NONE 0
|
|
|
+#define SQLITE_TXN_READ 1
|
|
|
+#define SQLITE_TXN_WRITE 2
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Find the next prepared statement
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^This interface returns a pointer to the next [prepared statement] after
|
|
|
+** pStmt associated with the [database connection] pDb. ^If pStmt is NULL
|
|
|
+** then this interface returns a pointer to the first prepared statement
|
|
|
+** associated with the database connection pDb. ^If no prepared statement
|
|
|
+** satisfies the conditions of this routine, it returns NULL.
|
|
|
+**
|
|
|
+** The [database connection] pointer D in a call to
|
|
|
+** [sqlite3_next_stmt(D,S)] must refer to an open database
|
|
|
+** connection and in particular must not be a NULL pointer.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_stmt *sqlite3_next_stmt(sqlite3 *pDb, sqlite3_stmt *pStmt);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Commit And Rollback Notification Callbacks
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_commit_hook() interface registers a callback
|
|
|
+** function to be invoked whenever a transaction is [COMMIT | committed].
|
|
|
+** ^Any callback set by a previous call to sqlite3_commit_hook()
|
|
|
+** for the same database connection is overridden.
|
|
|
+** ^The sqlite3_rollback_hook() interface registers a callback
|
|
|
+** function to be invoked whenever a transaction is [ROLLBACK | rolled back].
|
|
|
+** ^Any callback set by a previous call to sqlite3_rollback_hook()
|
|
|
+** for the same database connection is overridden.
|
|
|
+** ^The pArg argument is passed through to the callback.
|
|
|
+** ^If the callback on a commit hook function returns non-zero,
|
|
|
+** then the commit is converted into a rollback.
|
|
|
+**
|
|
|
+** ^The sqlite3_commit_hook(D,C,P) and sqlite3_rollback_hook(D,C,P) functions
|
|
|
+** return the P argument from the previous call of the same function
|
|
|
+** on the same [database connection] D, or NULL for
|
|
|
+** the first call for each function on D.
|
|
|
+**
|
|
|
+** The commit and rollback hook callbacks are not reentrant.
|
|
|
+** The callback implementation must not do anything that will modify
|
|
|
+** the database connection that invoked the callback. Any actions
|
|
|
+** to modify the database connection must be deferred until after the
|
|
|
+** completion of the [sqlite3_step()] call that triggered the commit
|
|
|
+** or rollback hook in the first place.
|
|
|
+** Note that running any other SQL statements, including SELECT statements,
|
|
|
+** or merely calling [sqlite3_prepare_v2()] and [sqlite3_step()] will modify
|
|
|
+** the database connections for the meaning of "modify" in this paragraph.
|
|
|
+**
|
|
|
+** ^Registering a NULL function disables the callback.
|
|
|
+**
|
|
|
+** ^When the commit hook callback routine returns zero, the [COMMIT]
|
|
|
+** operation is allowed to continue normally. ^If the commit hook
|
|
|
+** returns non-zero, then the [COMMIT] is converted into a [ROLLBACK].
|
|
|
+** ^The rollback hook is invoked on a rollback that results from a commit
|
|
|
+** hook returning non-zero, just as it would be with any other rollback.
|
|
|
+**
|
|
|
+** ^For the purposes of this API, a transaction is said to have been
|
|
|
+** rolled back if an explicit "ROLLBACK" statement is executed, or
|
|
|
+** an error or constraint causes an implicit rollback to occur.
|
|
|
+** ^The rollback callback is not invoked if a transaction is
|
|
|
+** automatically rolled back because the database connection is closed.
|
|
|
+**
|
|
|
+** See also the [sqlite3_update_hook()] interface.
|
|
|
+*/
|
|
|
+SQLITE_API void *sqlite3_commit_hook(sqlite3*, int(*)(void*), void*);
|
|
|
+SQLITE_API void *sqlite3_rollback_hook(sqlite3*, void(*)(void *), void*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Autovacuum Compaction Amount Callback
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_autovacuum_pages(D,C,P,X) interface registers a callback
|
|
|
+** function C that is invoked prior to each autovacuum of the database
|
|
|
+** file. ^The callback is passed a copy of the generic data pointer (P),
|
|
|
+** the schema-name of the attached database that is being autovacuumed,
|
|
|
+** the the size of the database file in pages, the number of free pages,
|
|
|
+** and the number of bytes per page, respectively. The callback should
|
|
|
+** return the number of free pages that should be removed by the
|
|
|
+** autovacuum. ^If the callback returns zero, then no autovacuum happens.
|
|
|
+** ^If the value returned is greater than or equal to the number of
|
|
|
+** free pages, then a complete autovacuum happens.
|
|
|
+**
|
|
|
+** <p>^If there are multiple ATTACH-ed database files that are being
|
|
|
+** modified as part of a transaction commit, then the autovacuum pages
|
|
|
+** callback is invoked separately for each file.
|
|
|
+**
|
|
|
+** <p><b>The callback is not reentrant.</b> The callback function should
|
|
|
+** not attempt to invoke any other SQLite interface. If it does, bad
|
|
|
+** things may happen, including segmentation faults and corrupt database
|
|
|
+** files. The callback function should be a simple function that
|
|
|
+** does some arithmetic on its input parameters and returns a result.
|
|
|
+**
|
|
|
+** ^The X parameter to sqlite3_autovacuum_pages(D,C,P,X) is an optional
|
|
|
+** destructor for the P parameter. ^If X is not NULL, then X(P) is
|
|
|
+** invoked whenever the database connection closes or when the callback
|
|
|
+** is overwritten by another invocation of sqlite3_autovacuum_pages().
|
|
|
+**
|
|
|
+** <p>^There is only one autovacuum pages callback per database connection.
|
|
|
+** ^Each call to the sqlite3_autovacuum_pages() interface overrides all
|
|
|
+** previous invocations for that database connection. ^If the callback
|
|
|
+** argument (C) to sqlite3_autovacuum_pages(D,C,P,X) is a NULL pointer,
|
|
|
+** then the autovacuum steps callback is cancelled. The return value
|
|
|
+** from sqlite3_autovacuum_pages() is normally SQLITE_OK, but might
|
|
|
+** be some other error code if something goes wrong. The current
|
|
|
+** implementation will only return SQLITE_OK or SQLITE_MISUSE, but other
|
|
|
+** return codes might be added in future releases.
|
|
|
+**
|
|
|
+** <p>If no autovacuum pages callback is specified (the usual case) or
|
|
|
+** a NULL pointer is provided for the callback,
|
|
|
+** then the default behavior is to vacuum all free pages. So, in other
|
|
|
+** words, the default behavior is the same as if the callback function
|
|
|
+** were something like this:
|
|
|
+**
|
|
|
+** <blockquote><pre>
|
|
|
+** unsigned int demonstration_autovac_pages_callback(
|
|
|
+** void *pClientData,
|
|
|
+** const char *zSchema,
|
|
|
+** unsigned int nDbPage,
|
|
|
+** unsigned int nFreePage,
|
|
|
+** unsigned int nBytePerPage
|
|
|
+** ){
|
|
|
+** return nFreePage;
|
|
|
+** }
|
|
|
+** </pre></blockquote>
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_autovacuum_pages(
|
|
|
+ sqlite3 *db,
|
|
|
+ unsigned int(*)(void*,const char*,unsigned int,unsigned int,unsigned int),
|
|
|
+ void*,
|
|
|
+ void(*)(void*)
|
|
|
+);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Data Change Notification Callbacks
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_update_hook() interface registers a callback function
|
|
|
+** with the [database connection] identified by the first argument
|
|
|
+** to be invoked whenever a row is updated, inserted or deleted in
|
|
|
+** a [rowid table].
|
|
|
+** ^Any callback set by a previous call to this function
|
|
|
+** for the same database connection is overridden.
|
|
|
+**
|
|
|
+** ^The second argument is a pointer to the function to invoke when a
|
|
|
+** row is updated, inserted or deleted in a rowid table.
|
|
|
+** ^The first argument to the callback is a copy of the third argument
|
|
|
+** to sqlite3_update_hook().
|
|
|
+** ^The second callback argument is one of [SQLITE_INSERT], [SQLITE_DELETE],
|
|
|
+** or [SQLITE_UPDATE], depending on the operation that caused the callback
|
|
|
+** to be invoked.
|
|
|
+** ^The third and fourth arguments to the callback contain pointers to the
|
|
|
+** database and table name containing the affected row.
|
|
|
+** ^The final callback parameter is the [rowid] of the row.
|
|
|
+** ^In the case of an update, this is the [rowid] after the update takes place.
|
|
|
+**
|
|
|
+** ^(The update hook is not invoked when internal system tables are
|
|
|
+** modified (i.e. sqlite_sequence).)^
|
|
|
+** ^The update hook is not invoked when [WITHOUT ROWID] tables are modified.
|
|
|
+**
|
|
|
+** ^In the current implementation, the update hook
|
|
|
+** is not invoked when conflicting rows are deleted because of an
|
|
|
+** [ON CONFLICT | ON CONFLICT REPLACE] clause. ^Nor is the update hook
|
|
|
+** invoked when rows are deleted using the [truncate optimization].
|
|
|
+** The exceptions defined in this paragraph might change in a future
|
|
|
+** release of SQLite.
|
|
|
+**
|
|
|
+** The update hook implementation must not do anything that will modify
|
|
|
+** the database connection that invoked the update hook. Any actions
|
|
|
+** to modify the database connection must be deferred until after the
|
|
|
+** completion of the [sqlite3_step()] call that triggered the update hook.
|
|
|
+** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
|
|
|
+** database connections for the meaning of "modify" in this paragraph.
|
|
|
+**
|
|
|
+** ^The sqlite3_update_hook(D,C,P) function
|
|
|
+** returns the P argument from the previous call
|
|
|
+** on the same [database connection] D, or NULL for
|
|
|
+** the first call on D.
|
|
|
+**
|
|
|
+** See also the [sqlite3_commit_hook()], [sqlite3_rollback_hook()],
|
|
|
+** and [sqlite3_preupdate_hook()] interfaces.
|
|
|
+*/
|
|
|
+SQLITE_API void *sqlite3_update_hook(
|
|
|
+ sqlite3*,
|
|
|
+ void(*)(void *,int ,char const *,char const *,sqlite3_int64),
|
|
|
+ void*
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Enable Or Disable Shared Pager Cache
|
|
|
+**
|
|
|
+** ^(This routine enables or disables the sharing of the database cache
|
|
|
+** and schema data structures between [database connection | connections]
|
|
|
+** to the same database. Sharing is enabled if the argument is true
|
|
|
+** and disabled if the argument is false.)^
|
|
|
+**
|
|
|
+** ^Cache sharing is enabled and disabled for an entire process.
|
|
|
+** This is a change as of SQLite [version 3.5.0] ([dateof:3.5.0]).
|
|
|
+** In prior versions of SQLite,
|
|
|
+** sharing was enabled or disabled for each thread separately.
|
|
|
+**
|
|
|
+** ^(The cache sharing mode set by this interface effects all subsequent
|
|
|
+** calls to [sqlite3_open()], [sqlite3_open_v2()], and [sqlite3_open16()].
|
|
|
+** Existing database connections continue to use the sharing mode
|
|
|
+** that was in effect at the time they were opened.)^
|
|
|
+**
|
|
|
+** ^(This routine returns [SQLITE_OK] if shared cache was enabled or disabled
|
|
|
+** successfully. An [error code] is returned otherwise.)^
|
|
|
+**
|
|
|
+** ^Shared cache is disabled by default. It is recommended that it stay
|
|
|
+** that way. In other words, do not use this routine. This interface
|
|
|
+** continues to be provided for historical compatibility, but its use is
|
|
|
+** discouraged. Any use of shared cache is discouraged. If shared cache
|
|
|
+** must be used, it is recommended that shared cache only be enabled for
|
|
|
+** individual database connections using the [sqlite3_open_v2()] interface
|
|
|
+** with the [SQLITE_OPEN_SHAREDCACHE] flag.
|
|
|
+**
|
|
|
+** Note: This method is disabled on MacOS X 10.7 and iOS version 5.0
|
|
|
+** and will always return SQLITE_MISUSE. On those systems,
|
|
|
+** shared cache mode should be enabled per-database connection via
|
|
|
+** [sqlite3_open_v2()] with [SQLITE_OPEN_SHAREDCACHE].
|
|
|
+**
|
|
|
+** This interface is threadsafe on processors where writing a
|
|
|
+** 32-bit integer is atomic.
|
|
|
+**
|
|
|
+** See Also: [SQLite Shared-Cache Mode]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_enable_shared_cache(int);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Attempt To Free Heap Memory
|
|
|
+**
|
|
|
+** ^The sqlite3_release_memory() interface attempts to free N bytes
|
|
|
+** of heap memory by deallocating non-essential memory allocations
|
|
|
+** held by the database library. Memory used to cache database
|
|
|
+** pages to improve performance is an example of non-essential memory.
|
|
|
+** ^sqlite3_release_memory() returns the number of bytes actually freed,
|
|
|
+** which might be more or less than the amount requested.
|
|
|
+** ^The sqlite3_release_memory() routine is a no-op returning zero
|
|
|
+** if SQLite is not compiled with [SQLITE_ENABLE_MEMORY_MANAGEMENT].
|
|
|
+**
|
|
|
+** See also: [sqlite3_db_release_memory()]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_release_memory(int);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Free Memory Used By A Database Connection
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_db_release_memory(D) interface attempts to free as much heap
|
|
|
+** memory as possible from database connection D. Unlike the
|
|
|
+** [sqlite3_release_memory()] interface, this interface is in effect even
|
|
|
+** when the [SQLITE_ENABLE_MEMORY_MANAGEMENT] compile-time option is
|
|
|
+** omitted.
|
|
|
+**
|
|
|
+** See also: [sqlite3_release_memory()]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_db_release_memory(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Impose A Limit On Heap Size
|
|
|
+**
|
|
|
+** These interfaces impose limits on the amount of heap memory that will be
|
|
|
+** by all database connections within a single process.
|
|
|
+**
|
|
|
+** ^The sqlite3_soft_heap_limit64() interface sets and/or queries the
|
|
|
+** soft limit on the amount of heap memory that may be allocated by SQLite.
|
|
|
+** ^SQLite strives to keep heap memory utilization below the soft heap
|
|
|
+** limit by reducing the number of pages held in the page cache
|
|
|
+** as heap memory usages approaches the limit.
|
|
|
+** ^The soft heap limit is "soft" because even though SQLite strives to stay
|
|
|
+** below the limit, it will exceed the limit rather than generate
|
|
|
+** an [SQLITE_NOMEM] error. In other words, the soft heap limit
|
|
|
+** is advisory only.
|
|
|
+**
|
|
|
+** ^The sqlite3_hard_heap_limit64(N) interface sets a hard upper bound of
|
|
|
+** N bytes on the amount of memory that will be allocated. ^The
|
|
|
+** sqlite3_hard_heap_limit64(N) interface is similar to
|
|
|
+** sqlite3_soft_heap_limit64(N) except that memory allocations will fail
|
|
|
+** when the hard heap limit is reached.
|
|
|
+**
|
|
|
+** ^The return value from both sqlite3_soft_heap_limit64() and
|
|
|
+** sqlite3_hard_heap_limit64() is the size of
|
|
|
+** the heap limit prior to the call, or negative in the case of an
|
|
|
+** error. ^If the argument N is negative
|
|
|
+** then no change is made to the heap limit. Hence, the current
|
|
|
+** size of heap limits can be determined by invoking
|
|
|
+** sqlite3_soft_heap_limit64(-1) or sqlite3_hard_heap_limit(-1).
|
|
|
+**
|
|
|
+** ^Setting the heap limits to zero disables the heap limiter mechanism.
|
|
|
+**
|
|
|
+** ^The soft heap limit may not be greater than the hard heap limit.
|
|
|
+** ^If the hard heap limit is enabled and if sqlite3_soft_heap_limit(N)
|
|
|
+** is invoked with a value of N that is greater than the hard heap limit,
|
|
|
+** the the soft heap limit is set to the value of the hard heap limit.
|
|
|
+** ^The soft heap limit is automatically enabled whenever the hard heap
|
|
|
+** limit is enabled. ^When sqlite3_hard_heap_limit64(N) is invoked and
|
|
|
+** the soft heap limit is outside the range of 1..N, then the soft heap
|
|
|
+** limit is set to N. ^Invoking sqlite3_soft_heap_limit64(0) when the
|
|
|
+** hard heap limit is enabled makes the soft heap limit equal to the
|
|
|
+** hard heap limit.
|
|
|
+**
|
|
|
+** The memory allocation limits can also be adjusted using
|
|
|
+** [PRAGMA soft_heap_limit] and [PRAGMA hard_heap_limit].
|
|
|
+**
|
|
|
+** ^(The heap limits are not enforced in the current implementation
|
|
|
+** if one or more of following conditions are true:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> The limit value is set to zero.
|
|
|
+** <li> Memory accounting is disabled using a combination of the
|
|
|
+** [sqlite3_config]([SQLITE_CONFIG_MEMSTATUS],...) start-time option and
|
|
|
+** the [SQLITE_DEFAULT_MEMSTATUS] compile-time option.
|
|
|
+** <li> An alternative page cache implementation is specified using
|
|
|
+** [sqlite3_config]([SQLITE_CONFIG_PCACHE2],...).
|
|
|
+** <li> The page cache allocates from its own memory pool supplied
|
|
|
+** by [sqlite3_config]([SQLITE_CONFIG_PAGECACHE],...) rather than
|
|
|
+** from the heap.
|
|
|
+** </ul>)^
|
|
|
+**
|
|
|
+** The circumstances under which SQLite will enforce the heap limits may
|
|
|
+** changes in future releases of SQLite.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_int64 sqlite3_soft_heap_limit64(sqlite3_int64 N);
|
|
|
+SQLITE_API sqlite3_int64 sqlite3_hard_heap_limit64(sqlite3_int64 N);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Deprecated Soft Heap Limit Interface
|
|
|
+** DEPRECATED
|
|
|
+**
|
|
|
+** This is a deprecated version of the [sqlite3_soft_heap_limit64()]
|
|
|
+** interface. This routine is provided for historical compatibility
|
|
|
+** only. All new applications should use the
|
|
|
+** [sqlite3_soft_heap_limit64()] interface rather than this one.
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_DEPRECATED void sqlite3_soft_heap_limit(int N);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Extract Metadata About A Column Of A Table
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^(The sqlite3_table_column_metadata(X,D,T,C,....) routine returns
|
|
|
+** information about column C of table T in database D
|
|
|
+** on [database connection] X.)^ ^The sqlite3_table_column_metadata()
|
|
|
+** interface returns SQLITE_OK and fills in the non-NULL pointers in
|
|
|
+** the final five arguments with appropriate values if the specified
|
|
|
+** column exists. ^The sqlite3_table_column_metadata() interface returns
|
|
|
+** SQLITE_ERROR if the specified column does not exist.
|
|
|
+** ^If the column-name parameter to sqlite3_table_column_metadata() is a
|
|
|
+** NULL pointer, then this routine simply checks for the existence of the
|
|
|
+** table and returns SQLITE_OK if the table exists and SQLITE_ERROR if it
|
|
|
+** does not. If the table name parameter T in a call to
|
|
|
+** sqlite3_table_column_metadata(X,D,T,C,...) is NULL then the result is
|
|
|
+** undefined behavior.
|
|
|
+**
|
|
|
+** ^The column is identified by the second, third and fourth parameters to
|
|
|
+** this function. ^(The second parameter is either the name of the database
|
|
|
+** (i.e. "main", "temp", or an attached database) containing the specified
|
|
|
+** table or NULL.)^ ^If it is NULL, then all attached databases are searched
|
|
|
+** for the table using the same algorithm used by the database engine to
|
|
|
+** resolve unqualified table references.
|
|
|
+**
|
|
|
+** ^The third and fourth parameters to this function are the table and column
|
|
|
+** name of the desired column, respectively.
|
|
|
+**
|
|
|
+** ^Metadata is returned by writing to the memory locations passed as the 5th
|
|
|
+** and subsequent parameters to this function. ^Any of these arguments may be
|
|
|
+** NULL, in which case the corresponding element of metadata is omitted.
|
|
|
+**
|
|
|
+** ^(<blockquote>
|
|
|
+** <table border="1">
|
|
|
+** <tr><th> Parameter <th> Output<br>Type <th> Description
|
|
|
+**
|
|
|
+** <tr><td> 5th <td> const char* <td> Data type
|
|
|
+** <tr><td> 6th <td> const char* <td> Name of default collation sequence
|
|
|
+** <tr><td> 7th <td> int <td> True if column has a NOT NULL constraint
|
|
|
+** <tr><td> 8th <td> int <td> True if column is part of the PRIMARY KEY
|
|
|
+** <tr><td> 9th <td> int <td> True if column is [AUTOINCREMENT]
|
|
|
+** </table>
|
|
|
+** </blockquote>)^
|
|
|
+**
|
|
|
+** ^The memory pointed to by the character pointers returned for the
|
|
|
+** declaration type and collation sequence is valid until the next
|
|
|
+** call to any SQLite API function.
|
|
|
+**
|
|
|
+** ^If the specified table is actually a view, an [error code] is returned.
|
|
|
+**
|
|
|
+** ^If the specified column is "rowid", "oid" or "_rowid_" and the table
|
|
|
+** is not a [WITHOUT ROWID] table and an
|
|
|
+** [INTEGER PRIMARY KEY] column has been explicitly declared, then the output
|
|
|
+** parameters are set for the explicitly declared column. ^(If there is no
|
|
|
+** [INTEGER PRIMARY KEY] column, then the outputs
|
|
|
+** for the [rowid] are set as follows:
|
|
|
+**
|
|
|
+** <pre>
|
|
|
+** data type: "INTEGER"
|
|
|
+** collation sequence: "BINARY"
|
|
|
+** not null: 0
|
|
|
+** primary key: 1
|
|
|
+** auto increment: 0
|
|
|
+** </pre>)^
|
|
|
+**
|
|
|
+** ^This function causes all database schemas to be read from disk and
|
|
|
+** parsed, if that has not already been done, and returns an error if
|
|
|
+** any errors are encountered while loading the schema.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_table_column_metadata(
|
|
|
+ sqlite3 *db, /* Connection handle */
|
|
|
+ const char *zDbName, /* Database name or NULL */
|
|
|
+ const char *zTableName, /* Table name */
|
|
|
+ const char *zColumnName, /* Column name */
|
|
|
+ char const **pzDataType, /* OUTPUT: Declared data type */
|
|
|
+ char const **pzCollSeq, /* OUTPUT: Collation sequence name */
|
|
|
+ int *pNotNull, /* OUTPUT: True if NOT NULL constraint exists */
|
|
|
+ int *pPrimaryKey, /* OUTPUT: True if column part of PK */
|
|
|
+ int *pAutoinc /* OUTPUT: True if column is auto-increment */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Load An Extension
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^This interface loads an SQLite extension library from the named file.
|
|
|
+**
|
|
|
+** ^The sqlite3_load_extension() interface attempts to load an
|
|
|
+** [SQLite extension] library contained in the file zFile. If
|
|
|
+** the file cannot be loaded directly, attempts are made to load
|
|
|
+** with various operating-system specific extensions added.
|
|
|
+** So for example, if "samplelib" cannot be loaded, then names like
|
|
|
+** "samplelib.so" or "samplelib.dylib" or "samplelib.dll" might
|
|
|
+** be tried also.
|
|
|
+**
|
|
|
+** ^The entry point is zProc.
|
|
|
+** ^(zProc may be 0, in which case SQLite will try to come up with an
|
|
|
+** entry point name on its own. It first tries "sqlite3_extension_init".
|
|
|
+** If that does not work, it constructs a name "sqlite3_X_init" where the
|
|
|
+** X is consists of the lower-case equivalent of all ASCII alphabetic
|
|
|
+** characters in the filename from the last "/" to the first following
|
|
|
+** "." and omitting any initial "lib".)^
|
|
|
+** ^The sqlite3_load_extension() interface returns
|
|
|
+** [SQLITE_OK] on success and [SQLITE_ERROR] if something goes wrong.
|
|
|
+** ^If an error occurs and pzErrMsg is not 0, then the
|
|
|
+** [sqlite3_load_extension()] interface shall attempt to
|
|
|
+** fill *pzErrMsg with error message text stored in memory
|
|
|
+** obtained from [sqlite3_malloc()]. The calling function
|
|
|
+** should free this memory by calling [sqlite3_free()].
|
|
|
+**
|
|
|
+** ^Extension loading must be enabled using
|
|
|
+** [sqlite3_enable_load_extension()] or
|
|
|
+** [sqlite3_db_config](db,[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION],1,NULL)
|
|
|
+** prior to calling this API,
|
|
|
+** otherwise an error will be returned.
|
|
|
+**
|
|
|
+** <b>Security warning:</b> It is recommended that the
|
|
|
+** [SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION] method be used to enable only this
|
|
|
+** interface. The use of the [sqlite3_enable_load_extension()] interface
|
|
|
+** should be avoided. This will keep the SQL function [load_extension()]
|
|
|
+** disabled and prevent SQL injections from giving attackers
|
|
|
+** access to extension loading capabilities.
|
|
|
+**
|
|
|
+** See also the [load_extension() SQL function].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_load_extension(
|
|
|
+ sqlite3 *db, /* Load the extension into this database connection */
|
|
|
+ const char *zFile, /* Name of the shared library containing extension */
|
|
|
+ const char *zProc, /* Entry point. Derived from zFile if 0 */
|
|
|
+ char **pzErrMsg /* Put error message here if not 0 */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Enable Or Disable Extension Loading
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^So as not to open security holes in older applications that are
|
|
|
+** unprepared to deal with [extension loading], and as a means of disabling
|
|
|
+** [extension loading] while evaluating user-entered SQL, the following API
|
|
|
+** is provided to turn the [sqlite3_load_extension()] mechanism on and off.
|
|
|
+**
|
|
|
+** ^Extension loading is off by default.
|
|
|
+** ^Call the sqlite3_enable_load_extension() routine with onoff==1
|
|
|
+** to turn extension loading on and call it with onoff==0 to turn
|
|
|
+** it back off again.
|
|
|
+**
|
|
|
+** ^This interface enables or disables both the C-API
|
|
|
+** [sqlite3_load_extension()] and the SQL function [load_extension()].
|
|
|
+** ^(Use [sqlite3_db_config](db,[SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION],..)
|
|
|
+** to enable or disable only the C-API.)^
|
|
|
+**
|
|
|
+** <b>Security warning:</b> It is recommended that extension loading
|
|
|
+** be enabled using the [SQLITE_DBCONFIG_ENABLE_LOAD_EXTENSION] method
|
|
|
+** rather than this interface, so the [load_extension()] SQL function
|
|
|
+** remains disabled. This will prevent SQL injections from giving attackers
|
|
|
+** access to extension loading capabilities.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_enable_load_extension(sqlite3 *db, int onoff);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Automatically Load Statically Linked Extensions
|
|
|
+**
|
|
|
+** ^This interface causes the xEntryPoint() function to be invoked for
|
|
|
+** each new [database connection] that is created. The idea here is that
|
|
|
+** xEntryPoint() is the entry point for a statically linked [SQLite extension]
|
|
|
+** that is to be automatically loaded into all new database connections.
|
|
|
+**
|
|
|
+** ^(Even though the function prototype shows that xEntryPoint() takes
|
|
|
+** no arguments and returns void, SQLite invokes xEntryPoint() with three
|
|
|
+** arguments and expects an integer result as if the signature of the
|
|
|
+** entry point where as follows:
|
|
|
+**
|
|
|
+** <blockquote><pre>
|
|
|
+** int xEntryPoint(
|
|
|
+** sqlite3 *db,
|
|
|
+** const char **pzErrMsg,
|
|
|
+** const struct sqlite3_api_routines *pThunk
|
|
|
+** );
|
|
|
+** </pre></blockquote>)^
|
|
|
+**
|
|
|
+** If the xEntryPoint routine encounters an error, it should make *pzErrMsg
|
|
|
+** point to an appropriate error message (obtained from [sqlite3_mprintf()])
|
|
|
+** and return an appropriate [error code]. ^SQLite ensures that *pzErrMsg
|
|
|
+** is NULL before calling the xEntryPoint(). ^SQLite will invoke
|
|
|
+** [sqlite3_free()] on *pzErrMsg after xEntryPoint() returns. ^If any
|
|
|
+** xEntryPoint() returns an error, the [sqlite3_open()], [sqlite3_open16()],
|
|
|
+** or [sqlite3_open_v2()] call that provoked the xEntryPoint() will fail.
|
|
|
+**
|
|
|
+** ^Calling sqlite3_auto_extension(X) with an entry point X that is already
|
|
|
+** on the list of automatic extensions is a harmless no-op. ^No entry point
|
|
|
+** will be called more than once for each database connection that is opened.
|
|
|
+**
|
|
|
+** See also: [sqlite3_reset_auto_extension()]
|
|
|
+** and [sqlite3_cancel_auto_extension()]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_auto_extension(void(*xEntryPoint)(void));
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Cancel Automatic Extension Loading
|
|
|
+**
|
|
|
+** ^The [sqlite3_cancel_auto_extension(X)] interface unregisters the
|
|
|
+** initialization routine X that was registered using a prior call to
|
|
|
+** [sqlite3_auto_extension(X)]. ^The [sqlite3_cancel_auto_extension(X)]
|
|
|
+** routine returns 1 if initialization routine X was successfully
|
|
|
+** unregistered and it returns 0 if X was not on the list of initialization
|
|
|
+** routines.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_cancel_auto_extension(void(*xEntryPoint)(void));
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Reset Automatic Extension Loading
|
|
|
+**
|
|
|
+** ^This interface disables all automatic extensions previously
|
|
|
+** registered using [sqlite3_auto_extension()].
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_reset_auto_extension(void);
|
|
|
+
|
|
|
+/*
|
|
|
+** The interface to the virtual-table mechanism is currently considered
|
|
|
+** to be experimental. The interface might change in incompatible ways.
|
|
|
+** If this is a problem for you, do not use the interface at this time.
|
|
|
+**
|
|
|
+** When the virtual-table mechanism stabilizes, we will declare the
|
|
|
+** interface fixed, support it indefinitely, and remove this comment.
|
|
|
+*/
|
|
|
+
|
|
|
+/*
|
|
|
+** Structures used by the virtual table interface
|
|
|
+*/
|
|
|
+typedef struct sqlite3_vtab sqlite3_vtab;
|
|
|
+typedef struct sqlite3_index_info sqlite3_index_info;
|
|
|
+typedef struct sqlite3_vtab_cursor sqlite3_vtab_cursor;
|
|
|
+typedef struct sqlite3_module sqlite3_module;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Virtual Table Object
|
|
|
+** KEYWORDS: sqlite3_module {virtual table module}
|
|
|
+**
|
|
|
+** This structure, sometimes called a "virtual table module",
|
|
|
+** defines the implementation of a [virtual table].
|
|
|
+** This structure consists mostly of methods for the module.
|
|
|
+**
|
|
|
+** ^A virtual table module is created by filling in a persistent
|
|
|
+** instance of this structure and passing a pointer to that instance
|
|
|
+** to [sqlite3_create_module()] or [sqlite3_create_module_v2()].
|
|
|
+** ^The registration remains valid until it is replaced by a different
|
|
|
+** module or until the [database connection] closes. The content
|
|
|
+** of this structure must not change while it is registered with
|
|
|
+** any database connection.
|
|
|
+*/
|
|
|
+struct sqlite3_module {
|
|
|
+ int iVersion;
|
|
|
+ int (*xCreate)(sqlite3*, void *pAux,
|
|
|
+ int argc, const char *const*argv,
|
|
|
+ sqlite3_vtab **ppVTab, char**);
|
|
|
+ int (*xConnect)(sqlite3*, void *pAux,
|
|
|
+ int argc, const char *const*argv,
|
|
|
+ sqlite3_vtab **ppVTab, char**);
|
|
|
+ int (*xBestIndex)(sqlite3_vtab *pVTab, sqlite3_index_info*);
|
|
|
+ int (*xDisconnect)(sqlite3_vtab *pVTab);
|
|
|
+ int (*xDestroy)(sqlite3_vtab *pVTab);
|
|
|
+ int (*xOpen)(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor);
|
|
|
+ int (*xClose)(sqlite3_vtab_cursor*);
|
|
|
+ int (*xFilter)(sqlite3_vtab_cursor*, int idxNum, const char *idxStr,
|
|
|
+ int argc, sqlite3_value **argv);
|
|
|
+ int (*xNext)(sqlite3_vtab_cursor*);
|
|
|
+ int (*xEof)(sqlite3_vtab_cursor*);
|
|
|
+ int (*xColumn)(sqlite3_vtab_cursor*, sqlite3_context*, int);
|
|
|
+ int (*xRowid)(sqlite3_vtab_cursor*, sqlite3_int64 *pRowid);
|
|
|
+ int (*xUpdate)(sqlite3_vtab *, int, sqlite3_value **, sqlite3_int64 *);
|
|
|
+ int (*xBegin)(sqlite3_vtab *pVTab);
|
|
|
+ int (*xSync)(sqlite3_vtab *pVTab);
|
|
|
+ int (*xCommit)(sqlite3_vtab *pVTab);
|
|
|
+ int (*xRollback)(sqlite3_vtab *pVTab);
|
|
|
+ int (*xFindFunction)(sqlite3_vtab *pVtab, int nArg, const char *zName,
|
|
|
+ void (**pxFunc)(sqlite3_context*,int,sqlite3_value**),
|
|
|
+ void **ppArg);
|
|
|
+ int (*xRename)(sqlite3_vtab *pVtab, const char *zNew);
|
|
|
+ /* The methods above are in version 1 of the sqlite_module object. Those
|
|
|
+ ** below are for version 2 and greater. */
|
|
|
+ int (*xSavepoint)(sqlite3_vtab *pVTab, int);
|
|
|
+ int (*xRelease)(sqlite3_vtab *pVTab, int);
|
|
|
+ int (*xRollbackTo)(sqlite3_vtab *pVTab, int);
|
|
|
+ /* The methods above are in versions 1 and 2 of the sqlite_module object.
|
|
|
+ ** Those below are for version 3 and greater. */
|
|
|
+ int (*xShadowName)(const char*);
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Virtual Table Indexing Information
|
|
|
+** KEYWORDS: sqlite3_index_info
|
|
|
+**
|
|
|
+** The sqlite3_index_info structure and its substructures is used as part
|
|
|
+** of the [virtual table] interface to
|
|
|
+** pass information into and receive the reply from the [xBestIndex]
|
|
|
+** method of a [virtual table module]. The fields under **Inputs** are the
|
|
|
+** inputs to xBestIndex and are read-only. xBestIndex inserts its
|
|
|
+** results into the **Outputs** fields.
|
|
|
+**
|
|
|
+** ^(The aConstraint[] array records WHERE clause constraints of the form:
|
|
|
+**
|
|
|
+** <blockquote>column OP expr</blockquote>
|
|
|
+**
|
|
|
+** where OP is =, <, <=, >, or >=.)^ ^(The particular operator is
|
|
|
+** stored in aConstraint[].op using one of the
|
|
|
+** [SQLITE_INDEX_CONSTRAINT_EQ | SQLITE_INDEX_CONSTRAINT_ values].)^
|
|
|
+** ^(The index of the column is stored in
|
|
|
+** aConstraint[].iColumn.)^ ^(aConstraint[].usable is TRUE if the
|
|
|
+** expr on the right-hand side can be evaluated (and thus the constraint
|
|
|
+** is usable) and false if it cannot.)^
|
|
|
+**
|
|
|
+** ^The optimizer automatically inverts terms of the form "expr OP column"
|
|
|
+** and makes other simplifications to the WHERE clause in an attempt to
|
|
|
+** get as many WHERE clause terms into the form shown above as possible.
|
|
|
+** ^The aConstraint[] array only reports WHERE clause terms that are
|
|
|
+** relevant to the particular virtual table being queried.
|
|
|
+**
|
|
|
+** ^Information about the ORDER BY clause is stored in aOrderBy[].
|
|
|
+** ^Each term of aOrderBy records a column of the ORDER BY clause.
|
|
|
+**
|
|
|
+** The colUsed field indicates which columns of the virtual table may be
|
|
|
+** required by the current scan. Virtual table columns are numbered from
|
|
|
+** zero in the order in which they appear within the CREATE TABLE statement
|
|
|
+** passed to sqlite3_declare_vtab(). For the first 63 columns (columns 0-62),
|
|
|
+** the corresponding bit is set within the colUsed mask if the column may be
|
|
|
+** required by SQLite. If the table has at least 64 columns and any column
|
|
|
+** to the right of the first 63 is required, then bit 63 of colUsed is also
|
|
|
+** set. In other words, column iCol may be required if the expression
|
|
|
+** (colUsed & ((sqlite3_uint64)1 << (iCol>=63 ? 63 : iCol))) evaluates to
|
|
|
+** non-zero.
|
|
|
+**
|
|
|
+** The [xBestIndex] method must fill aConstraintUsage[] with information
|
|
|
+** about what parameters to pass to xFilter. ^If argvIndex>0 then
|
|
|
+** the right-hand side of the corresponding aConstraint[] is evaluated
|
|
|
+** and becomes the argvIndex-th entry in argv. ^(If aConstraintUsage[].omit
|
|
|
+** is true, then the constraint is assumed to be fully handled by the
|
|
|
+** virtual table and might not be checked again by the byte code.)^ ^(The
|
|
|
+** aConstraintUsage[].omit flag is an optimization hint. When the omit flag
|
|
|
+** is left in its default setting of false, the constraint will always be
|
|
|
+** checked separately in byte code. If the omit flag is change to true, then
|
|
|
+** the constraint may or may not be checked in byte code. In other words,
|
|
|
+** when the omit flag is true there is no guarantee that the constraint will
|
|
|
+** not be checked again using byte code.)^
|
|
|
+**
|
|
|
+** ^The idxNum and idxPtr values are recorded and passed into the
|
|
|
+** [xFilter] method.
|
|
|
+** ^[sqlite3_free()] is used to free idxPtr if and only if
|
|
|
+** needToFreeIdxPtr is true.
|
|
|
+**
|
|
|
+** ^The orderByConsumed means that output from [xFilter]/[xNext] will occur in
|
|
|
+** the correct order to satisfy the ORDER BY clause so that no separate
|
|
|
+** sorting step is required.
|
|
|
+**
|
|
|
+** ^The estimatedCost value is an estimate of the cost of a particular
|
|
|
+** strategy. A cost of N indicates that the cost of the strategy is similar
|
|
|
+** to a linear scan of an SQLite table with N rows. A cost of log(N)
|
|
|
+** indicates that the expense of the operation is similar to that of a
|
|
|
+** binary search on a unique indexed field of an SQLite table with N rows.
|
|
|
+**
|
|
|
+** ^The estimatedRows value is an estimate of the number of rows that
|
|
|
+** will be returned by the strategy.
|
|
|
+**
|
|
|
+** The xBestIndex method may optionally populate the idxFlags field with a
|
|
|
+** mask of SQLITE_INDEX_SCAN_* flags. Currently there is only one such flag -
|
|
|
+** SQLITE_INDEX_SCAN_UNIQUE. If the xBestIndex method sets this flag, SQLite
|
|
|
+** assumes that the strategy may visit at most one row.
|
|
|
+**
|
|
|
+** Additionally, if xBestIndex sets the SQLITE_INDEX_SCAN_UNIQUE flag, then
|
|
|
+** SQLite also assumes that if a call to the xUpdate() method is made as
|
|
|
+** part of the same statement to delete or update a virtual table row and the
|
|
|
+** implementation returns SQLITE_CONSTRAINT, then there is no need to rollback
|
|
|
+** any database changes. In other words, if the xUpdate() returns
|
|
|
+** SQLITE_CONSTRAINT, the database contents must be exactly as they were
|
|
|
+** before xUpdate was called. By contrast, if SQLITE_INDEX_SCAN_UNIQUE is not
|
|
|
+** set and xUpdate returns SQLITE_CONSTRAINT, any database changes made by
|
|
|
+** the xUpdate method are automatically rolled back by SQLite.
|
|
|
+**
|
|
|
+** IMPORTANT: The estimatedRows field was added to the sqlite3_index_info
|
|
|
+** structure for SQLite [version 3.8.2] ([dateof:3.8.2]).
|
|
|
+** If a virtual table extension is
|
|
|
+** used with an SQLite version earlier than 3.8.2, the results of attempting
|
|
|
+** to read or write the estimatedRows field are undefined (but are likely
|
|
|
+** to include crashing the application). The estimatedRows field should
|
|
|
+** therefore only be used if [sqlite3_libversion_number()] returns a
|
|
|
+** value greater than or equal to 3008002. Similarly, the idxFlags field
|
|
|
+** was added for [version 3.9.0] ([dateof:3.9.0]).
|
|
|
+** It may therefore only be used if
|
|
|
+** sqlite3_libversion_number() returns a value greater than or equal to
|
|
|
+** 3009000.
|
|
|
+*/
|
|
|
+struct sqlite3_index_info {
|
|
|
+ /* Inputs */
|
|
|
+ int nConstraint; /* Number of entries in aConstraint */
|
|
|
+ struct sqlite3_index_constraint {
|
|
|
+ int iColumn; /* Column constrained. -1 for ROWID */
|
|
|
+ unsigned char op; /* Constraint operator */
|
|
|
+ unsigned char usable; /* True if this constraint is usable */
|
|
|
+ int iTermOffset; /* Used internally - xBestIndex should ignore */
|
|
|
+ } *aConstraint; /* Table of WHERE clause constraints */
|
|
|
+ int nOrderBy; /* Number of terms in the ORDER BY clause */
|
|
|
+ struct sqlite3_index_orderby {
|
|
|
+ int iColumn; /* Column number */
|
|
|
+ unsigned char desc; /* True for DESC. False for ASC. */
|
|
|
+ } *aOrderBy; /* The ORDER BY clause */
|
|
|
+ /* Outputs */
|
|
|
+ struct sqlite3_index_constraint_usage {
|
|
|
+ int argvIndex; /* if >0, constraint is part of argv to xFilter */
|
|
|
+ unsigned char omit; /* Do not code a test for this constraint */
|
|
|
+ } *aConstraintUsage;
|
|
|
+ int idxNum; /* Number used to identify the index */
|
|
|
+ char *idxStr; /* String, possibly obtained from sqlite3_malloc */
|
|
|
+ int needToFreeIdxStr; /* Free idxStr using sqlite3_free() if true */
|
|
|
+ int orderByConsumed; /* True if output is already ordered */
|
|
|
+ double estimatedCost; /* Estimated cost of using this index */
|
|
|
+ /* Fields below are only available in SQLite 3.8.2 and later */
|
|
|
+ sqlite3_int64 estimatedRows; /* Estimated number of rows returned */
|
|
|
+ /* Fields below are only available in SQLite 3.9.0 and later */
|
|
|
+ int idxFlags; /* Mask of SQLITE_INDEX_SCAN_* flags */
|
|
|
+ /* Fields below are only available in SQLite 3.10.0 and later */
|
|
|
+ sqlite3_uint64 colUsed; /* Input: Mask of columns used by statement */
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Virtual Table Scan Flags
|
|
|
+**
|
|
|
+** Virtual table implementations are allowed to set the
|
|
|
+** [sqlite3_index_info].idxFlags field to some combination of
|
|
|
+** these bits.
|
|
|
+*/
|
|
|
+#define SQLITE_INDEX_SCAN_UNIQUE 1 /* Scan visits at most 1 row */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Virtual Table Constraint Operator Codes
|
|
|
+**
|
|
|
+** These macros define the allowed values for the
|
|
|
+** [sqlite3_index_info].aConstraint[].op field. Each value represents
|
|
|
+** an operator that is part of a constraint term in the WHERE clause of
|
|
|
+** a query that uses a [virtual table].
|
|
|
+**
|
|
|
+** ^The left-hand operand of the operator is given by the corresponding
|
|
|
+** aConstraint[].iColumn field. ^An iColumn of -1 indicates the left-hand
|
|
|
+** operand is the rowid.
|
|
|
+** The SQLITE_INDEX_CONSTRAINT_LIMIT and SQLITE_INDEX_CONSTRAINT_OFFSET
|
|
|
+** operators have no left-hand operand, and so for those operators the
|
|
|
+** corresponding aConstraint[].iColumn is meaningless and should not be
|
|
|
+** used.
|
|
|
+**
|
|
|
+** All operator values from SQLITE_INDEX_CONSTRAINT_FUNCTION through
|
|
|
+** value 255 are reserved to represent functions that are overloaded
|
|
|
+** by the [xFindFunction|xFindFunction method] of the virtual table
|
|
|
+** implementation.
|
|
|
+**
|
|
|
+** The right-hand operands for each constraint might be accessible using
|
|
|
+** the [sqlite3_vtab_rhs_value()] interface. Usually the right-hand
|
|
|
+** operand is only available if it appears as a single constant literal
|
|
|
+** in the input SQL. If the right-hand operand is another column or an
|
|
|
+** expression (even a constant expression) or a parameter, then the
|
|
|
+** sqlite3_vtab_rhs_value() probably will not be able to extract it.
|
|
|
+** ^The SQLITE_INDEX_CONSTRAINT_ISNULL and
|
|
|
+** SQLITE_INDEX_CONSTRAINT_ISNOTNULL operators have no right-hand operand
|
|
|
+** and hence calls to sqlite3_vtab_rhs_value() for those operators will
|
|
|
+** always return SQLITE_NOTFOUND.
|
|
|
+**
|
|
|
+** The collating sequence to be used for comparison can be found using
|
|
|
+** the [sqlite3_vtab_collation()] interface. For most real-world virtual
|
|
|
+** tables, the collating sequence of constraints does not matter (for example
|
|
|
+** because the constraints are numeric) and so the sqlite3_vtab_collation()
|
|
|
+** interface is no commonly needed.
|
|
|
+*/
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_EQ 2
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_GT 4
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_LE 8
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_LT 16
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_GE 32
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_MATCH 64
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_LIKE 65
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_GLOB 66
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_REGEXP 67
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_NE 68
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_ISNOT 69
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_ISNOTNULL 70
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_ISNULL 71
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_IS 72
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_LIMIT 73
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_OFFSET 74
|
|
|
+#define SQLITE_INDEX_CONSTRAINT_FUNCTION 150
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Register A Virtual Table Implementation
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^These routines are used to register a new [virtual table module] name.
|
|
|
+** ^Module names must be registered before
|
|
|
+** creating a new [virtual table] using the module and before using a
|
|
|
+** preexisting [virtual table] for the module.
|
|
|
+**
|
|
|
+** ^The module name is registered on the [database connection] specified
|
|
|
+** by the first parameter. ^The name of the module is given by the
|
|
|
+** second parameter. ^The third parameter is a pointer to
|
|
|
+** the implementation of the [virtual table module]. ^The fourth
|
|
|
+** parameter is an arbitrary client data pointer that is passed through
|
|
|
+** into the [xCreate] and [xConnect] methods of the virtual table module
|
|
|
+** when a new virtual table is be being created or reinitialized.
|
|
|
+**
|
|
|
+** ^The sqlite3_create_module_v2() interface has a fifth parameter which
|
|
|
+** is a pointer to a destructor for the pClientData. ^SQLite will
|
|
|
+** invoke the destructor function (if it is not NULL) when SQLite
|
|
|
+** no longer needs the pClientData pointer. ^The destructor will also
|
|
|
+** be invoked if the call to sqlite3_create_module_v2() fails.
|
|
|
+** ^The sqlite3_create_module()
|
|
|
+** interface is equivalent to sqlite3_create_module_v2() with a NULL
|
|
|
+** destructor.
|
|
|
+**
|
|
|
+** ^If the third parameter (the pointer to the sqlite3_module object) is
|
|
|
+** NULL then no new module is created and any existing modules with the
|
|
|
+** same name are dropped.
|
|
|
+**
|
|
|
+** See also: [sqlite3_drop_modules()]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_create_module(
|
|
|
+ sqlite3 *db, /* SQLite connection to register module with */
|
|
|
+ const char *zName, /* Name of the module */
|
|
|
+ const sqlite3_module *p, /* Methods for the module */
|
|
|
+ void *pClientData /* Client data for xCreate/xConnect */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_create_module_v2(
|
|
|
+ sqlite3 *db, /* SQLite connection to register module with */
|
|
|
+ const char *zName, /* Name of the module */
|
|
|
+ const sqlite3_module *p, /* Methods for the module */
|
|
|
+ void *pClientData, /* Client data for xCreate/xConnect */
|
|
|
+ void(*xDestroy)(void*) /* Module destructor function */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Remove Unnecessary Virtual Table Implementations
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The sqlite3_drop_modules(D,L) interface removes all virtual
|
|
|
+** table modules from database connection D except those named on list L.
|
|
|
+** The L parameter must be either NULL or a pointer to an array of pointers
|
|
|
+** to strings where the array is terminated by a single NULL pointer.
|
|
|
+** ^If the L parameter is NULL, then all virtual table modules are removed.
|
|
|
+**
|
|
|
+** See also: [sqlite3_create_module()]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_drop_modules(
|
|
|
+ sqlite3 *db, /* Remove modules from this connection */
|
|
|
+ const char **azKeep /* Except, do not remove the ones named here */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Virtual Table Instance Object
|
|
|
+** KEYWORDS: sqlite3_vtab
|
|
|
+**
|
|
|
+** Every [virtual table module] implementation uses a subclass
|
|
|
+** of this object to describe a particular instance
|
|
|
+** of the [virtual table]. Each subclass will
|
|
|
+** be tailored to the specific needs of the module implementation.
|
|
|
+** The purpose of this superclass is to define certain fields that are
|
|
|
+** common to all module implementations.
|
|
|
+**
|
|
|
+** ^Virtual tables methods can set an error message by assigning a
|
|
|
+** string obtained from [sqlite3_mprintf()] to zErrMsg. The method should
|
|
|
+** take care that any prior string is freed by a call to [sqlite3_free()]
|
|
|
+** prior to assigning a new string to zErrMsg. ^After the error message
|
|
|
+** is delivered up to the client application, the string will be automatically
|
|
|
+** freed by sqlite3_free() and the zErrMsg field will be zeroed.
|
|
|
+*/
|
|
|
+struct sqlite3_vtab {
|
|
|
+ const sqlite3_module *pModule; /* The module for this virtual table */
|
|
|
+ int nRef; /* Number of open cursors */
|
|
|
+ char *zErrMsg; /* Error message from sqlite3_mprintf() */
|
|
|
+ /* Virtual table implementations will typically add additional fields */
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Virtual Table Cursor Object
|
|
|
+** KEYWORDS: sqlite3_vtab_cursor {virtual table cursor}
|
|
|
+**
|
|
|
+** Every [virtual table module] implementation uses a subclass of the
|
|
|
+** following structure to describe cursors that point into the
|
|
|
+** [virtual table] and are used
|
|
|
+** to loop through the virtual table. Cursors are created using the
|
|
|
+** [sqlite3_module.xOpen | xOpen] method of the module and are destroyed
|
|
|
+** by the [sqlite3_module.xClose | xClose] method. Cursors are used
|
|
|
+** by the [xFilter], [xNext], [xEof], [xColumn], and [xRowid] methods
|
|
|
+** of the module. Each module implementation will define
|
|
|
+** the content of a cursor structure to suit its own needs.
|
|
|
+**
|
|
|
+** This superclass exists in order to define fields of the cursor that
|
|
|
+** are common to all implementations.
|
|
|
+*/
|
|
|
+struct sqlite3_vtab_cursor {
|
|
|
+ sqlite3_vtab *pVtab; /* Virtual table of this cursor */
|
|
|
+ /* Virtual table implementations will typically add additional fields */
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Declare The Schema Of A Virtual Table
|
|
|
+**
|
|
|
+** ^The [xCreate] and [xConnect] methods of a
|
|
|
+** [virtual table module] call this interface
|
|
|
+** to declare the format (the names and datatypes of the columns) of
|
|
|
+** the virtual tables they implement.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_declare_vtab(sqlite3*, const char *zSQL);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Overload A Function For A Virtual Table
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^(Virtual tables can provide alternative implementations of functions
|
|
|
+** using the [xFindFunction] method of the [virtual table module].
|
|
|
+** But global versions of those functions
|
|
|
+** must exist in order to be overloaded.)^
|
|
|
+**
|
|
|
+** ^(This API makes sure a global version of a function with a particular
|
|
|
+** name and number of parameters exists. If no such function exists
|
|
|
+** before this API is called, a new function is created.)^ ^The implementation
|
|
|
+** of the new function always causes an exception to be thrown. So
|
|
|
+** the new function is not good for anything by itself. Its only
|
|
|
+** purpose is to be a placeholder function that can be overloaded
|
|
|
+** by a [virtual table].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_overload_function(sqlite3*, const char *zFuncName, int nArg);
|
|
|
+
|
|
|
+/*
|
|
|
+** The interface to the virtual-table mechanism defined above (back up
|
|
|
+** to a comment remarkably similar to this one) is currently considered
|
|
|
+** to be experimental. The interface might change in incompatible ways.
|
|
|
+** If this is a problem for you, do not use the interface at this time.
|
|
|
+**
|
|
|
+** When the virtual-table mechanism stabilizes, we will declare the
|
|
|
+** interface fixed, support it indefinitely, and remove this comment.
|
|
|
+*/
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: A Handle To An Open BLOB
|
|
|
+** KEYWORDS: {BLOB handle} {BLOB handles}
|
|
|
+**
|
|
|
+** An instance of this object represents an open BLOB on which
|
|
|
+** [sqlite3_blob_open | incremental BLOB I/O] can be performed.
|
|
|
+** ^Objects of this type are created by [sqlite3_blob_open()]
|
|
|
+** and destroyed by [sqlite3_blob_close()].
|
|
|
+** ^The [sqlite3_blob_read()] and [sqlite3_blob_write()] interfaces
|
|
|
+** can be used to read or write small subsections of the BLOB.
|
|
|
+** ^The [sqlite3_blob_bytes()] interface returns the size of the BLOB in bytes.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_blob sqlite3_blob;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Open A BLOB For Incremental I/O
|
|
|
+** METHOD: sqlite3
|
|
|
+** CONSTRUCTOR: sqlite3_blob
|
|
|
+**
|
|
|
+** ^(This interfaces opens a [BLOB handle | handle] to the BLOB located
|
|
|
+** in row iRow, column zColumn, table zTable in database zDb;
|
|
|
+** in other words, the same BLOB that would be selected by:
|
|
|
+**
|
|
|
+** <pre>
|
|
|
+** SELECT zColumn FROM zDb.zTable WHERE [rowid] = iRow;
|
|
|
+** </pre>)^
|
|
|
+**
|
|
|
+** ^(Parameter zDb is not the filename that contains the database, but
|
|
|
+** rather the symbolic name of the database. For attached databases, this is
|
|
|
+** the name that appears after the AS keyword in the [ATTACH] statement.
|
|
|
+** For the main database file, the database name is "main". For TEMP
|
|
|
+** tables, the database name is "temp".)^
|
|
|
+**
|
|
|
+** ^If the flags parameter is non-zero, then the BLOB is opened for read
|
|
|
+** and write access. ^If the flags parameter is zero, the BLOB is opened for
|
|
|
+** read-only access.
|
|
|
+**
|
|
|
+** ^(On success, [SQLITE_OK] is returned and the new [BLOB handle] is stored
|
|
|
+** in *ppBlob. Otherwise an [error code] is returned and, unless the error
|
|
|
+** code is SQLITE_MISUSE, *ppBlob is set to NULL.)^ ^This means that, provided
|
|
|
+** the API is not misused, it is always safe to call [sqlite3_blob_close()]
|
|
|
+** on *ppBlob after this function it returns.
|
|
|
+**
|
|
|
+** This function fails with SQLITE_ERROR if any of the following are true:
|
|
|
+** <ul>
|
|
|
+** <li> ^(Database zDb does not exist)^,
|
|
|
+** <li> ^(Table zTable does not exist within database zDb)^,
|
|
|
+** <li> ^(Table zTable is a WITHOUT ROWID table)^,
|
|
|
+** <li> ^(Column zColumn does not exist)^,
|
|
|
+** <li> ^(Row iRow is not present in the table)^,
|
|
|
+** <li> ^(The specified column of row iRow contains a value that is not
|
|
|
+** a TEXT or BLOB value)^,
|
|
|
+** <li> ^(Column zColumn is part of an index, PRIMARY KEY or UNIQUE
|
|
|
+** constraint and the blob is being opened for read/write access)^,
|
|
|
+** <li> ^([foreign key constraints | Foreign key constraints] are enabled,
|
|
|
+** column zColumn is part of a [child key] definition and the blob is
|
|
|
+** being opened for read/write access)^.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** ^Unless it returns SQLITE_MISUSE, this function sets the
|
|
|
+** [database connection] error code and message accessible via
|
|
|
+** [sqlite3_errcode()] and [sqlite3_errmsg()] and related functions.
|
|
|
+**
|
|
|
+** A BLOB referenced by sqlite3_blob_open() may be read using the
|
|
|
+** [sqlite3_blob_read()] interface and modified by using
|
|
|
+** [sqlite3_blob_write()]. The [BLOB handle] can be moved to a
|
|
|
+** different row of the same table using the [sqlite3_blob_reopen()]
|
|
|
+** interface. However, the column, table, or database of a [BLOB handle]
|
|
|
+** cannot be changed after the [BLOB handle] is opened.
|
|
|
+**
|
|
|
+** ^(If the row that a BLOB handle points to is modified by an
|
|
|
+** [UPDATE], [DELETE], or by [ON CONFLICT] side-effects
|
|
|
+** then the BLOB handle is marked as "expired".
|
|
|
+** This is true if any column of the row is changed, even a column
|
|
|
+** other than the one the BLOB handle is open on.)^
|
|
|
+** ^Calls to [sqlite3_blob_read()] and [sqlite3_blob_write()] for
|
|
|
+** an expired BLOB handle fail with a return code of [SQLITE_ABORT].
|
|
|
+** ^(Changes written into a BLOB prior to the BLOB expiring are not
|
|
|
+** rolled back by the expiration of the BLOB. Such changes will eventually
|
|
|
+** commit if the transaction continues to completion.)^
|
|
|
+**
|
|
|
+** ^Use the [sqlite3_blob_bytes()] interface to determine the size of
|
|
|
+** the opened blob. ^The size of a blob may not be changed by this
|
|
|
+** interface. Use the [UPDATE] SQL command to change the size of a
|
|
|
+** blob.
|
|
|
+**
|
|
|
+** ^The [sqlite3_bind_zeroblob()] and [sqlite3_result_zeroblob()] interfaces
|
|
|
+** and the built-in [zeroblob] SQL function may be used to create a
|
|
|
+** zero-filled blob to read or write using the incremental-blob interface.
|
|
|
+**
|
|
|
+** To avoid a resource leak, every open [BLOB handle] should eventually
|
|
|
+** be released by a call to [sqlite3_blob_close()].
|
|
|
+**
|
|
|
+** See also: [sqlite3_blob_close()],
|
|
|
+** [sqlite3_blob_reopen()], [sqlite3_blob_read()],
|
|
|
+** [sqlite3_blob_bytes()], [sqlite3_blob_write()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_blob_open(
|
|
|
+ sqlite3*,
|
|
|
+ const char *zDb,
|
|
|
+ const char *zTable,
|
|
|
+ const char *zColumn,
|
|
|
+ sqlite3_int64 iRow,
|
|
|
+ int flags,
|
|
|
+ sqlite3_blob **ppBlob
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Move a BLOB Handle to a New Row
|
|
|
+** METHOD: sqlite3_blob
|
|
|
+**
|
|
|
+** ^This function is used to move an existing [BLOB handle] so that it points
|
|
|
+** to a different row of the same database table. ^The new row is identified
|
|
|
+** by the rowid value passed as the second argument. Only the row can be
|
|
|
+** changed. ^The database, table and column on which the blob handle is open
|
|
|
+** remain the same. Moving an existing [BLOB handle] to a new row is
|
|
|
+** faster than closing the existing handle and opening a new one.
|
|
|
+**
|
|
|
+** ^(The new row must meet the same criteria as for [sqlite3_blob_open()] -
|
|
|
+** it must exist and there must be either a blob or text value stored in
|
|
|
+** the nominated column.)^ ^If the new row is not present in the table, or if
|
|
|
+** it does not contain a blob or text value, or if another error occurs, an
|
|
|
+** SQLite error code is returned and the blob handle is considered aborted.
|
|
|
+** ^All subsequent calls to [sqlite3_blob_read()], [sqlite3_blob_write()] or
|
|
|
+** [sqlite3_blob_reopen()] on an aborted blob handle immediately return
|
|
|
+** SQLITE_ABORT. ^Calling [sqlite3_blob_bytes()] on an aborted blob handle
|
|
|
+** always returns zero.
|
|
|
+**
|
|
|
+** ^This function sets the database handle error code and message.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_blob_reopen(sqlite3_blob *, sqlite3_int64);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Close A BLOB Handle
|
|
|
+** DESTRUCTOR: sqlite3_blob
|
|
|
+**
|
|
|
+** ^This function closes an open [BLOB handle]. ^(The BLOB handle is closed
|
|
|
+** unconditionally. Even if this routine returns an error code, the
|
|
|
+** handle is still closed.)^
|
|
|
+**
|
|
|
+** ^If the blob handle being closed was opened for read-write access, and if
|
|
|
+** the database is in auto-commit mode and there are no other open read-write
|
|
|
+** blob handles or active write statements, the current transaction is
|
|
|
+** committed. ^If an error occurs while committing the transaction, an error
|
|
|
+** code is returned and the transaction rolled back.
|
|
|
+**
|
|
|
+** Calling this function with an argument that is not a NULL pointer or an
|
|
|
+** open blob handle results in undefined behaviour. ^Calling this routine
|
|
|
+** with a null pointer (such as would be returned by a failed call to
|
|
|
+** [sqlite3_blob_open()]) is a harmless no-op. ^Otherwise, if this function
|
|
|
+** is passed a valid open blob handle, the values returned by the
|
|
|
+** sqlite3_errcode() and sqlite3_errmsg() functions are set before returning.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_blob_close(sqlite3_blob *);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Return The Size Of An Open BLOB
|
|
|
+** METHOD: sqlite3_blob
|
|
|
+**
|
|
|
+** ^Returns the size in bytes of the BLOB accessible via the
|
|
|
+** successfully opened [BLOB handle] in its only argument. ^The
|
|
|
+** incremental blob I/O routines can only read or overwriting existing
|
|
|
+** blob content; they cannot change the size of a blob.
|
|
|
+**
|
|
|
+** This routine only works on a [BLOB handle] which has been created
|
|
|
+** by a prior successful call to [sqlite3_blob_open()] and which has not
|
|
|
+** been closed by [sqlite3_blob_close()]. Passing any other pointer in
|
|
|
+** to this routine results in undefined and probably undesirable behavior.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_blob_bytes(sqlite3_blob *);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Read Data From A BLOB Incrementally
|
|
|
+** METHOD: sqlite3_blob
|
|
|
+**
|
|
|
+** ^(This function is used to read data from an open [BLOB handle] into a
|
|
|
+** caller-supplied buffer. N bytes of data are copied into buffer Z
|
|
|
+** from the open BLOB, starting at offset iOffset.)^
|
|
|
+**
|
|
|
+** ^If offset iOffset is less than N bytes from the end of the BLOB,
|
|
|
+** [SQLITE_ERROR] is returned and no data is read. ^If N or iOffset is
|
|
|
+** less than zero, [SQLITE_ERROR] is returned and no data is read.
|
|
|
+** ^The size of the blob (and hence the maximum value of N+iOffset)
|
|
|
+** can be determined using the [sqlite3_blob_bytes()] interface.
|
|
|
+**
|
|
|
+** ^An attempt to read from an expired [BLOB handle] fails with an
|
|
|
+** error code of [SQLITE_ABORT].
|
|
|
+**
|
|
|
+** ^(On success, sqlite3_blob_read() returns SQLITE_OK.
|
|
|
+** Otherwise, an [error code] or an [extended error code] is returned.)^
|
|
|
+**
|
|
|
+** This routine only works on a [BLOB handle] which has been created
|
|
|
+** by a prior successful call to [sqlite3_blob_open()] and which has not
|
|
|
+** been closed by [sqlite3_blob_close()]. Passing any other pointer in
|
|
|
+** to this routine results in undefined and probably undesirable behavior.
|
|
|
+**
|
|
|
+** See also: [sqlite3_blob_write()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_blob_read(sqlite3_blob *, void *Z, int N, int iOffset);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Write Data Into A BLOB Incrementally
|
|
|
+** METHOD: sqlite3_blob
|
|
|
+**
|
|
|
+** ^(This function is used to write data into an open [BLOB handle] from a
|
|
|
+** caller-supplied buffer. N bytes of data are copied from the buffer Z
|
|
|
+** into the open BLOB, starting at offset iOffset.)^
|
|
|
+**
|
|
|
+** ^(On success, sqlite3_blob_write() returns SQLITE_OK.
|
|
|
+** Otherwise, an [error code] or an [extended error code] is returned.)^
|
|
|
+** ^Unless SQLITE_MISUSE is returned, this function sets the
|
|
|
+** [database connection] error code and message accessible via
|
|
|
+** [sqlite3_errcode()] and [sqlite3_errmsg()] and related functions.
|
|
|
+**
|
|
|
+** ^If the [BLOB handle] passed as the first argument was not opened for
|
|
|
+** writing (the flags parameter to [sqlite3_blob_open()] was zero),
|
|
|
+** this function returns [SQLITE_READONLY].
|
|
|
+**
|
|
|
+** This function may only modify the contents of the BLOB; it is
|
|
|
+** not possible to increase the size of a BLOB using this API.
|
|
|
+** ^If offset iOffset is less than N bytes from the end of the BLOB,
|
|
|
+** [SQLITE_ERROR] is returned and no data is written. The size of the
|
|
|
+** BLOB (and hence the maximum value of N+iOffset) can be determined
|
|
|
+** using the [sqlite3_blob_bytes()] interface. ^If N or iOffset are less
|
|
|
+** than zero [SQLITE_ERROR] is returned and no data is written.
|
|
|
+**
|
|
|
+** ^An attempt to write to an expired [BLOB handle] fails with an
|
|
|
+** error code of [SQLITE_ABORT]. ^Writes to the BLOB that occurred
|
|
|
+** before the [BLOB handle] expired are not rolled back by the
|
|
|
+** expiration of the handle, though of course those changes might
|
|
|
+** have been overwritten by the statement that expired the BLOB handle
|
|
|
+** or by other independent statements.
|
|
|
+**
|
|
|
+** This routine only works on a [BLOB handle] which has been created
|
|
|
+** by a prior successful call to [sqlite3_blob_open()] and which has not
|
|
|
+** been closed by [sqlite3_blob_close()]. Passing any other pointer in
|
|
|
+** to this routine results in undefined and probably undesirable behavior.
|
|
|
+**
|
|
|
+** See also: [sqlite3_blob_read()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_blob_write(sqlite3_blob *, const void *z, int n, int iOffset);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Virtual File System Objects
|
|
|
+**
|
|
|
+** A virtual filesystem (VFS) is an [sqlite3_vfs] object
|
|
|
+** that SQLite uses to interact
|
|
|
+** with the underlying operating system. Most SQLite builds come with a
|
|
|
+** single default VFS that is appropriate for the host computer.
|
|
|
+** New VFSes can be registered and existing VFSes can be unregistered.
|
|
|
+** The following interfaces are provided.
|
|
|
+**
|
|
|
+** ^The sqlite3_vfs_find() interface returns a pointer to a VFS given its name.
|
|
|
+** ^Names are case sensitive.
|
|
|
+** ^Names are zero-terminated UTF-8 strings.
|
|
|
+** ^If there is no match, a NULL pointer is returned.
|
|
|
+** ^If zVfsName is NULL then the default VFS is returned.
|
|
|
+**
|
|
|
+** ^New VFSes are registered with sqlite3_vfs_register().
|
|
|
+** ^Each new VFS becomes the default VFS if the makeDflt flag is set.
|
|
|
+** ^The same VFS can be registered multiple times without injury.
|
|
|
+** ^To make an existing VFS into the default VFS, register it again
|
|
|
+** with the makeDflt flag set. If two different VFSes with the
|
|
|
+** same name are registered, the behavior is undefined. If a
|
|
|
+** VFS is registered with a name that is NULL or an empty string,
|
|
|
+** then the behavior is undefined.
|
|
|
+**
|
|
|
+** ^Unregister a VFS with the sqlite3_vfs_unregister() interface.
|
|
|
+** ^(If the default VFS is unregistered, another VFS is chosen as
|
|
|
+** the default. The choice for the new VFS is arbitrary.)^
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName);
|
|
|
+SQLITE_API int sqlite3_vfs_register(sqlite3_vfs*, int makeDflt);
|
|
|
+SQLITE_API int sqlite3_vfs_unregister(sqlite3_vfs*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Mutexes
|
|
|
+**
|
|
|
+** The SQLite core uses these routines for thread
|
|
|
+** synchronization. Though they are intended for internal
|
|
|
+** use by SQLite, code that links against SQLite is
|
|
|
+** permitted to use any of these routines.
|
|
|
+**
|
|
|
+** The SQLite source code contains multiple implementations
|
|
|
+** of these mutex routines. An appropriate implementation
|
|
|
+** is selected automatically at compile-time. The following
|
|
|
+** implementations are available in the SQLite core:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> SQLITE_MUTEX_PTHREADS
|
|
|
+** <li> SQLITE_MUTEX_W32
|
|
|
+** <li> SQLITE_MUTEX_NOOP
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** The SQLITE_MUTEX_NOOP implementation is a set of routines
|
|
|
+** that does no real locking and is appropriate for use in
|
|
|
+** a single-threaded application. The SQLITE_MUTEX_PTHREADS and
|
|
|
+** SQLITE_MUTEX_W32 implementations are appropriate for use on Unix
|
|
|
+** and Windows.
|
|
|
+**
|
|
|
+** If SQLite is compiled with the SQLITE_MUTEX_APPDEF preprocessor
|
|
|
+** macro defined (with "-DSQLITE_MUTEX_APPDEF=1"), then no mutex
|
|
|
+** implementation is included with the library. In this case the
|
|
|
+** application must supply a custom mutex implementation using the
|
|
|
+** [SQLITE_CONFIG_MUTEX] option of the sqlite3_config() function
|
|
|
+** before calling sqlite3_initialize() or any other public sqlite3_
|
|
|
+** function that calls sqlite3_initialize().
|
|
|
+**
|
|
|
+** ^The sqlite3_mutex_alloc() routine allocates a new
|
|
|
+** mutex and returns a pointer to it. ^The sqlite3_mutex_alloc()
|
|
|
+** routine returns NULL if it is unable to allocate the requested
|
|
|
+** mutex. The argument to sqlite3_mutex_alloc() must one of these
|
|
|
+** integer constants:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> SQLITE_MUTEX_FAST
|
|
|
+** <li> SQLITE_MUTEX_RECURSIVE
|
|
|
+** <li> SQLITE_MUTEX_STATIC_MAIN
|
|
|
+** <li> SQLITE_MUTEX_STATIC_MEM
|
|
|
+** <li> SQLITE_MUTEX_STATIC_OPEN
|
|
|
+** <li> SQLITE_MUTEX_STATIC_PRNG
|
|
|
+** <li> SQLITE_MUTEX_STATIC_LRU
|
|
|
+** <li> SQLITE_MUTEX_STATIC_PMEM
|
|
|
+** <li> SQLITE_MUTEX_STATIC_APP1
|
|
|
+** <li> SQLITE_MUTEX_STATIC_APP2
|
|
|
+** <li> SQLITE_MUTEX_STATIC_APP3
|
|
|
+** <li> SQLITE_MUTEX_STATIC_VFS1
|
|
|
+** <li> SQLITE_MUTEX_STATIC_VFS2
|
|
|
+** <li> SQLITE_MUTEX_STATIC_VFS3
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** ^The first two constants (SQLITE_MUTEX_FAST and SQLITE_MUTEX_RECURSIVE)
|
|
|
+** cause sqlite3_mutex_alloc() to create
|
|
|
+** a new mutex. ^The new mutex is recursive when SQLITE_MUTEX_RECURSIVE
|
|
|
+** is used but not necessarily so when SQLITE_MUTEX_FAST is used.
|
|
|
+** The mutex implementation does not need to make a distinction
|
|
|
+** between SQLITE_MUTEX_RECURSIVE and SQLITE_MUTEX_FAST if it does
|
|
|
+** not want to. SQLite will only request a recursive mutex in
|
|
|
+** cases where it really needs one. If a faster non-recursive mutex
|
|
|
+** implementation is available on the host platform, the mutex subsystem
|
|
|
+** might return such a mutex in response to SQLITE_MUTEX_FAST.
|
|
|
+**
|
|
|
+** ^The other allowed parameters to sqlite3_mutex_alloc() (anything other
|
|
|
+** than SQLITE_MUTEX_FAST and SQLITE_MUTEX_RECURSIVE) each return
|
|
|
+** a pointer to a static preexisting mutex. ^Nine static mutexes are
|
|
|
+** used by the current version of SQLite. Future versions of SQLite
|
|
|
+** may add additional static mutexes. Static mutexes are for internal
|
|
|
+** use by SQLite only. Applications that use SQLite mutexes should
|
|
|
+** use only the dynamic mutexes returned by SQLITE_MUTEX_FAST or
|
|
|
+** SQLITE_MUTEX_RECURSIVE.
|
|
|
+**
|
|
|
+** ^Note that if one of the dynamic mutex parameters (SQLITE_MUTEX_FAST
|
|
|
+** or SQLITE_MUTEX_RECURSIVE) is used then sqlite3_mutex_alloc()
|
|
|
+** returns a different mutex on every call. ^For the static
|
|
|
+** mutex types, the same mutex is returned on every call that has
|
|
|
+** the same type number.
|
|
|
+**
|
|
|
+** ^The sqlite3_mutex_free() routine deallocates a previously
|
|
|
+** allocated dynamic mutex. Attempting to deallocate a static
|
|
|
+** mutex results in undefined behavior.
|
|
|
+**
|
|
|
+** ^The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt
|
|
|
+** to enter a mutex. ^If another thread is already within the mutex,
|
|
|
+** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return
|
|
|
+** SQLITE_BUSY. ^The sqlite3_mutex_try() interface returns [SQLITE_OK]
|
|
|
+** upon successful entry. ^(Mutexes created using
|
|
|
+** SQLITE_MUTEX_RECURSIVE can be entered multiple times by the same thread.
|
|
|
+** In such cases, the
|
|
|
+** mutex must be exited an equal number of times before another thread
|
|
|
+** can enter.)^ If the same thread tries to enter any mutex other
|
|
|
+** than an SQLITE_MUTEX_RECURSIVE more than once, the behavior is undefined.
|
|
|
+**
|
|
|
+** ^(Some systems (for example, Windows 95) do not support the operation
|
|
|
+** implemented by sqlite3_mutex_try(). On those systems, sqlite3_mutex_try()
|
|
|
+** will always return SQLITE_BUSY. The SQLite core only ever uses
|
|
|
+** sqlite3_mutex_try() as an optimization so this is acceptable
|
|
|
+** behavior.)^
|
|
|
+**
|
|
|
+** ^The sqlite3_mutex_leave() routine exits a mutex that was
|
|
|
+** previously entered by the same thread. The behavior
|
|
|
+** is undefined if the mutex is not currently entered by the
|
|
|
+** calling thread or is not currently allocated.
|
|
|
+**
|
|
|
+** ^If the argument to sqlite3_mutex_enter(), sqlite3_mutex_try(), or
|
|
|
+** sqlite3_mutex_leave() is a NULL pointer, then all three routines
|
|
|
+** behave as no-ops.
|
|
|
+**
|
|
|
+** See also: [sqlite3_mutex_held()] and [sqlite3_mutex_notheld()].
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_mutex *sqlite3_mutex_alloc(int);
|
|
|
+SQLITE_API void sqlite3_mutex_free(sqlite3_mutex*);
|
|
|
+SQLITE_API void sqlite3_mutex_enter(sqlite3_mutex*);
|
|
|
+SQLITE_API int sqlite3_mutex_try(sqlite3_mutex*);
|
|
|
+SQLITE_API void sqlite3_mutex_leave(sqlite3_mutex*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Mutex Methods Object
|
|
|
+**
|
|
|
+** An instance of this structure defines the low-level routines
|
|
|
+** used to allocate and use mutexes.
|
|
|
+**
|
|
|
+** Usually, the default mutex implementations provided by SQLite are
|
|
|
+** sufficient, however the application has the option of substituting a custom
|
|
|
+** implementation for specialized deployments or systems for which SQLite
|
|
|
+** does not provide a suitable implementation. In this case, the application
|
|
|
+** creates and populates an instance of this structure to pass
|
|
|
+** to sqlite3_config() along with the [SQLITE_CONFIG_MUTEX] option.
|
|
|
+** Additionally, an instance of this structure can be used as an
|
|
|
+** output variable when querying the system for the current mutex
|
|
|
+** implementation, using the [SQLITE_CONFIG_GETMUTEX] option.
|
|
|
+**
|
|
|
+** ^The xMutexInit method defined by this structure is invoked as
|
|
|
+** part of system initialization by the sqlite3_initialize() function.
|
|
|
+** ^The xMutexInit routine is called by SQLite exactly once for each
|
|
|
+** effective call to [sqlite3_initialize()].
|
|
|
+**
|
|
|
+** ^The xMutexEnd method defined by this structure is invoked as
|
|
|
+** part of system shutdown by the sqlite3_shutdown() function. The
|
|
|
+** implementation of this method is expected to release all outstanding
|
|
|
+** resources obtained by the mutex methods implementation, especially
|
|
|
+** those obtained by the xMutexInit method. ^The xMutexEnd()
|
|
|
+** interface is invoked exactly once for each call to [sqlite3_shutdown()].
|
|
|
+**
|
|
|
+** ^(The remaining seven methods defined by this structure (xMutexAlloc,
|
|
|
+** xMutexFree, xMutexEnter, xMutexTry, xMutexLeave, xMutexHeld and
|
|
|
+** xMutexNotheld) implement the following interfaces (respectively):
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> [sqlite3_mutex_alloc()] </li>
|
|
|
+** <li> [sqlite3_mutex_free()] </li>
|
|
|
+** <li> [sqlite3_mutex_enter()] </li>
|
|
|
+** <li> [sqlite3_mutex_try()] </li>
|
|
|
+** <li> [sqlite3_mutex_leave()] </li>
|
|
|
+** <li> [sqlite3_mutex_held()] </li>
|
|
|
+** <li> [sqlite3_mutex_notheld()] </li>
|
|
|
+** </ul>)^
|
|
|
+**
|
|
|
+** The only difference is that the public sqlite3_XXX functions enumerated
|
|
|
+** above silently ignore any invocations that pass a NULL pointer instead
|
|
|
+** of a valid mutex handle. The implementations of the methods defined
|
|
|
+** by this structure are not required to handle this case. The results
|
|
|
+** of passing a NULL pointer instead of a valid mutex handle are undefined
|
|
|
+** (i.e. it is acceptable to provide an implementation that segfaults if
|
|
|
+** it is passed a NULL pointer).
|
|
|
+**
|
|
|
+** The xMutexInit() method must be threadsafe. It must be harmless to
|
|
|
+** invoke xMutexInit() multiple times within the same process and without
|
|
|
+** intervening calls to xMutexEnd(). Second and subsequent calls to
|
|
|
+** xMutexInit() must be no-ops.
|
|
|
+**
|
|
|
+** xMutexInit() must not use SQLite memory allocation ([sqlite3_malloc()]
|
|
|
+** and its associates). Similarly, xMutexAlloc() must not use SQLite memory
|
|
|
+** allocation for a static mutex. ^However xMutexAlloc() may use SQLite
|
|
|
+** memory allocation for a fast or recursive mutex.
|
|
|
+**
|
|
|
+** ^SQLite will invoke the xMutexEnd() method when [sqlite3_shutdown()] is
|
|
|
+** called, but only if the prior call to xMutexInit returned SQLITE_OK.
|
|
|
+** If xMutexInit fails in any way, it is expected to clean up after itself
|
|
|
+** prior to returning.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_mutex_methods sqlite3_mutex_methods;
|
|
|
+struct sqlite3_mutex_methods {
|
|
|
+ int (*xMutexInit)(void);
|
|
|
+ int (*xMutexEnd)(void);
|
|
|
+ sqlite3_mutex *(*xMutexAlloc)(int);
|
|
|
+ void (*xMutexFree)(sqlite3_mutex *);
|
|
|
+ void (*xMutexEnter)(sqlite3_mutex *);
|
|
|
+ int (*xMutexTry)(sqlite3_mutex *);
|
|
|
+ void (*xMutexLeave)(sqlite3_mutex *);
|
|
|
+ int (*xMutexHeld)(sqlite3_mutex *);
|
|
|
+ int (*xMutexNotheld)(sqlite3_mutex *);
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Mutex Verification Routines
|
|
|
+**
|
|
|
+** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routines
|
|
|
+** are intended for use inside assert() statements. The SQLite core
|
|
|
+** never uses these routines except inside an assert() and applications
|
|
|
+** are advised to follow the lead of the core. The SQLite core only
|
|
|
+** provides implementations for these routines when it is compiled
|
|
|
+** with the SQLITE_DEBUG flag. External mutex implementations
|
|
|
+** are only required to provide these routines if SQLITE_DEBUG is
|
|
|
+** defined and if NDEBUG is not defined.
|
|
|
+**
|
|
|
+** These routines should return true if the mutex in their argument
|
|
|
+** is held or not held, respectively, by the calling thread.
|
|
|
+**
|
|
|
+** The implementation is not required to provide versions of these
|
|
|
+** routines that actually work. If the implementation does not provide working
|
|
|
+** versions of these routines, it should at least provide stubs that always
|
|
|
+** return true so that one does not get spurious assertion failures.
|
|
|
+**
|
|
|
+** If the argument to sqlite3_mutex_held() is a NULL pointer then
|
|
|
+** the routine should return 1. This seems counter-intuitive since
|
|
|
+** clearly the mutex cannot be held if it does not exist. But
|
|
|
+** the reason the mutex does not exist is because the build is not
|
|
|
+** using mutexes. And we do not want the assert() containing the
|
|
|
+** call to sqlite3_mutex_held() to fail, so a non-zero return is
|
|
|
+** the appropriate thing to do. The sqlite3_mutex_notheld()
|
|
|
+** interface should also return 1 when given a NULL pointer.
|
|
|
+*/
|
|
|
+#ifndef NDEBUG
|
|
|
+SQLITE_API int sqlite3_mutex_held(sqlite3_mutex*);
|
|
|
+SQLITE_API int sqlite3_mutex_notheld(sqlite3_mutex*);
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Mutex Types
|
|
|
+**
|
|
|
+** The [sqlite3_mutex_alloc()] interface takes a single argument
|
|
|
+** which is one of these integer constants.
|
|
|
+**
|
|
|
+** The set of static mutexes may change from one SQLite release to the
|
|
|
+** next. Applications that override the built-in mutex logic must be
|
|
|
+** prepared to accommodate additional static mutexes.
|
|
|
+*/
|
|
|
+#define SQLITE_MUTEX_FAST 0
|
|
|
+#define SQLITE_MUTEX_RECURSIVE 1
|
|
|
+#define SQLITE_MUTEX_STATIC_MAIN 2
|
|
|
+#define SQLITE_MUTEX_STATIC_MEM 3 /* sqlite3_malloc() */
|
|
|
+#define SQLITE_MUTEX_STATIC_MEM2 4 /* NOT USED */
|
|
|
+#define SQLITE_MUTEX_STATIC_OPEN 4 /* sqlite3BtreeOpen() */
|
|
|
+#define SQLITE_MUTEX_STATIC_PRNG 5 /* sqlite3_randomness() */
|
|
|
+#define SQLITE_MUTEX_STATIC_LRU 6 /* lru page list */
|
|
|
+#define SQLITE_MUTEX_STATIC_LRU2 7 /* NOT USED */
|
|
|
+#define SQLITE_MUTEX_STATIC_PMEM 7 /* sqlite3PageMalloc() */
|
|
|
+#define SQLITE_MUTEX_STATIC_APP1 8 /* For use by application */
|
|
|
+#define SQLITE_MUTEX_STATIC_APP2 9 /* For use by application */
|
|
|
+#define SQLITE_MUTEX_STATIC_APP3 10 /* For use by application */
|
|
|
+#define SQLITE_MUTEX_STATIC_VFS1 11 /* For use by built-in VFS */
|
|
|
+#define SQLITE_MUTEX_STATIC_VFS2 12 /* For use by extension VFS */
|
|
|
+#define SQLITE_MUTEX_STATIC_VFS3 13 /* For use by application VFS */
|
|
|
+
|
|
|
+/* Legacy compatibility: */
|
|
|
+#define SQLITE_MUTEX_STATIC_MASTER 2
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Retrieve the mutex for a database connection
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^This interface returns a pointer the [sqlite3_mutex] object that
|
|
|
+** serializes access to the [database connection] given in the argument
|
|
|
+** when the [threading mode] is Serialized.
|
|
|
+** ^If the [threading mode] is Single-thread or Multi-thread then this
|
|
|
+** routine returns a NULL pointer.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_mutex *sqlite3_db_mutex(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Low-Level Control Of Database Files
|
|
|
+** METHOD: sqlite3
|
|
|
+** KEYWORDS: {file control}
|
|
|
+**
|
|
|
+** ^The [sqlite3_file_control()] interface makes a direct call to the
|
|
|
+** xFileControl method for the [sqlite3_io_methods] object associated
|
|
|
+** with a particular database identified by the second argument. ^The
|
|
|
+** name of the database is "main" for the main database or "temp" for the
|
|
|
+** TEMP database, or the name that appears after the AS keyword for
|
|
|
+** databases that are added using the [ATTACH] SQL command.
|
|
|
+** ^A NULL pointer can be used in place of "main" to refer to the
|
|
|
+** main database file.
|
|
|
+** ^The third and fourth parameters to this routine
|
|
|
+** are passed directly through to the second and third parameters of
|
|
|
+** the xFileControl method. ^The return value of the xFileControl
|
|
|
+** method becomes the return value of this routine.
|
|
|
+**
|
|
|
+** A few opcodes for [sqlite3_file_control()] are handled directly
|
|
|
+** by the SQLite core and never invoke the
|
|
|
+** sqlite3_io_methods.xFileControl method.
|
|
|
+** ^The [SQLITE_FCNTL_FILE_POINTER] value for the op parameter causes
|
|
|
+** a pointer to the underlying [sqlite3_file] object to be written into
|
|
|
+** the space pointed to by the 4th parameter. The
|
|
|
+** [SQLITE_FCNTL_JOURNAL_POINTER] works similarly except that it returns
|
|
|
+** the [sqlite3_file] object associated with the journal file instead of
|
|
|
+** the main database. The [SQLITE_FCNTL_VFS_POINTER] opcode returns
|
|
|
+** a pointer to the underlying [sqlite3_vfs] object for the file.
|
|
|
+** The [SQLITE_FCNTL_DATA_VERSION] returns the data version counter
|
|
|
+** from the pager.
|
|
|
+**
|
|
|
+** ^If the second parameter (zDbName) does not match the name of any
|
|
|
+** open database file, then SQLITE_ERROR is returned. ^This error
|
|
|
+** code is not remembered and will not be recalled by [sqlite3_errcode()]
|
|
|
+** or [sqlite3_errmsg()]. The underlying xFileControl method might
|
|
|
+** also return SQLITE_ERROR. There is no way to distinguish between
|
|
|
+** an incorrect zDbName and an SQLITE_ERROR return from the underlying
|
|
|
+** xFileControl method.
|
|
|
+**
|
|
|
+** See also: [file control opcodes]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_file_control(sqlite3*, const char *zDbName, int op, void*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Testing Interface
|
|
|
+**
|
|
|
+** ^The sqlite3_test_control() interface is used to read out internal
|
|
|
+** state of SQLite and to inject faults into SQLite for testing
|
|
|
+** purposes. ^The first parameter is an operation code that determines
|
|
|
+** the number, meaning, and operation of all subsequent parameters.
|
|
|
+**
|
|
|
+** This interface is not for use by applications. It exists solely
|
|
|
+** for verifying the correct operation of the SQLite library. Depending
|
|
|
+** on how the SQLite library is compiled, this interface might not exist.
|
|
|
+**
|
|
|
+** The details of the operation codes, their meanings, the parameters
|
|
|
+** they take, and what they do are all subject to change without notice.
|
|
|
+** Unlike most of the SQLite API, this function is not guaranteed to
|
|
|
+** operate consistently from one release to the next.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_test_control(int op, ...);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Testing Interface Operation Codes
|
|
|
+**
|
|
|
+** These constants are the valid operation code parameters used
|
|
|
+** as the first argument to [sqlite3_test_control()].
|
|
|
+**
|
|
|
+** These parameters and their meanings are subject to change
|
|
|
+** without notice. These values are for testing purposes only.
|
|
|
+** Applications should not use any of these parameters or the
|
|
|
+** [sqlite3_test_control()] interface.
|
|
|
+*/
|
|
|
+#define SQLITE_TESTCTRL_FIRST 5
|
|
|
+#define SQLITE_TESTCTRL_PRNG_SAVE 5
|
|
|
+#define SQLITE_TESTCTRL_PRNG_RESTORE 6
|
|
|
+#define SQLITE_TESTCTRL_PRNG_RESET 7 /* NOT USED */
|
|
|
+#define SQLITE_TESTCTRL_BITVEC_TEST 8
|
|
|
+#define SQLITE_TESTCTRL_FAULT_INSTALL 9
|
|
|
+#define SQLITE_TESTCTRL_BENIGN_MALLOC_HOOKS 10
|
|
|
+#define SQLITE_TESTCTRL_PENDING_BYTE 11
|
|
|
+#define SQLITE_TESTCTRL_ASSERT 12
|
|
|
+#define SQLITE_TESTCTRL_ALWAYS 13
|
|
|
+#define SQLITE_TESTCTRL_RESERVE 14 /* NOT USED */
|
|
|
+#define SQLITE_TESTCTRL_OPTIMIZATIONS 15
|
|
|
+#define SQLITE_TESTCTRL_ISKEYWORD 16 /* NOT USED */
|
|
|
+#define SQLITE_TESTCTRL_SCRATCHMALLOC 17 /* NOT USED */
|
|
|
+#define SQLITE_TESTCTRL_INTERNAL_FUNCTIONS 17
|
|
|
+#define SQLITE_TESTCTRL_LOCALTIME_FAULT 18
|
|
|
+#define SQLITE_TESTCTRL_EXPLAIN_STMT 19 /* NOT USED */
|
|
|
+#define SQLITE_TESTCTRL_ONCE_RESET_THRESHOLD 19
|
|
|
+#define SQLITE_TESTCTRL_NEVER_CORRUPT 20
|
|
|
+#define SQLITE_TESTCTRL_VDBE_COVERAGE 21
|
|
|
+#define SQLITE_TESTCTRL_BYTEORDER 22
|
|
|
+#define SQLITE_TESTCTRL_ISINIT 23
|
|
|
+#define SQLITE_TESTCTRL_SORTER_MMAP 24
|
|
|
+#define SQLITE_TESTCTRL_IMPOSTER 25
|
|
|
+#define SQLITE_TESTCTRL_PARSER_COVERAGE 26
|
|
|
+#define SQLITE_TESTCTRL_RESULT_INTREAL 27
|
|
|
+#define SQLITE_TESTCTRL_PRNG_SEED 28
|
|
|
+#define SQLITE_TESTCTRL_EXTRA_SCHEMA_CHECKS 29
|
|
|
+#define SQLITE_TESTCTRL_SEEK_COUNT 30
|
|
|
+#define SQLITE_TESTCTRL_TRACEFLAGS 31
|
|
|
+#define SQLITE_TESTCTRL_TUNE 32
|
|
|
+#define SQLITE_TESTCTRL_LOGEST 33
|
|
|
+#define SQLITE_TESTCTRL_LAST 33 /* Largest TESTCTRL */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: SQL Keyword Checking
|
|
|
+**
|
|
|
+** These routines provide access to the set of SQL language keywords
|
|
|
+** recognized by SQLite. Applications can uses these routines to determine
|
|
|
+** whether or not a specific identifier needs to be escaped (for example,
|
|
|
+** by enclosing in double-quotes) so as not to confuse the parser.
|
|
|
+**
|
|
|
+** The sqlite3_keyword_count() interface returns the number of distinct
|
|
|
+** keywords understood by SQLite.
|
|
|
+**
|
|
|
+** The sqlite3_keyword_name(N,Z,L) interface finds the N-th keyword and
|
|
|
+** makes *Z point to that keyword expressed as UTF8 and writes the number
|
|
|
+** of bytes in the keyword into *L. The string that *Z points to is not
|
|
|
+** zero-terminated. The sqlite3_keyword_name(N,Z,L) routine returns
|
|
|
+** SQLITE_OK if N is within bounds and SQLITE_ERROR if not. If either Z
|
|
|
+** or L are NULL or invalid pointers then calls to
|
|
|
+** sqlite3_keyword_name(N,Z,L) result in undefined behavior.
|
|
|
+**
|
|
|
+** The sqlite3_keyword_check(Z,L) interface checks to see whether or not
|
|
|
+** the L-byte UTF8 identifier that Z points to is a keyword, returning non-zero
|
|
|
+** if it is and zero if not.
|
|
|
+**
|
|
|
+** The parser used by SQLite is forgiving. It is often possible to use
|
|
|
+** a keyword as an identifier as long as such use does not result in a
|
|
|
+** parsing ambiguity. For example, the statement
|
|
|
+** "CREATE TABLE BEGIN(REPLACE,PRAGMA,END);" is accepted by SQLite, and
|
|
|
+** creates a new table named "BEGIN" with three columns named
|
|
|
+** "REPLACE", "PRAGMA", and "END". Nevertheless, best practice is to avoid
|
|
|
+** using keywords as identifiers. Common techniques used to avoid keyword
|
|
|
+** name collisions include:
|
|
|
+** <ul>
|
|
|
+** <li> Put all identifier names inside double-quotes. This is the official
|
|
|
+** SQL way to escape identifier names.
|
|
|
+** <li> Put identifier names inside [...]. This is not standard SQL,
|
|
|
+** but it is what SQL Server does and so lots of programmers use this
|
|
|
+** technique.
|
|
|
+** <li> Begin every identifier with the letter "Z" as no SQL keywords start
|
|
|
+** with "Z".
|
|
|
+** <li> Include a digit somewhere in every identifier name.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** Note that the number of keywords understood by SQLite can depend on
|
|
|
+** compile-time options. For example, "VACUUM" is not a keyword if
|
|
|
+** SQLite is compiled with the [-DSQLITE_OMIT_VACUUM] option. Also,
|
|
|
+** new keywords may be added to future releases of SQLite.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_keyword_count(void);
|
|
|
+SQLITE_API int sqlite3_keyword_name(int,const char**,int*);
|
|
|
+SQLITE_API int sqlite3_keyword_check(const char*,int);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Dynamic String Object
|
|
|
+** KEYWORDS: {dynamic string}
|
|
|
+**
|
|
|
+** An instance of the sqlite3_str object contains a dynamically-sized
|
|
|
+** string under construction.
|
|
|
+**
|
|
|
+** The lifecycle of an sqlite3_str object is as follows:
|
|
|
+** <ol>
|
|
|
+** <li> ^The sqlite3_str object is created using [sqlite3_str_new()].
|
|
|
+** <li> ^Text is appended to the sqlite3_str object using various
|
|
|
+** methods, such as [sqlite3_str_appendf()].
|
|
|
+** <li> ^The sqlite3_str object is destroyed and the string it created
|
|
|
+** is returned using the [sqlite3_str_finish()] interface.
|
|
|
+** </ol>
|
|
|
+*/
|
|
|
+typedef struct sqlite3_str sqlite3_str;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Create A New Dynamic String Object
|
|
|
+** CONSTRUCTOR: sqlite3_str
|
|
|
+**
|
|
|
+** ^The [sqlite3_str_new(D)] interface allocates and initializes
|
|
|
+** a new [sqlite3_str] object. To avoid memory leaks, the object returned by
|
|
|
+** [sqlite3_str_new()] must be freed by a subsequent call to
|
|
|
+** [sqlite3_str_finish(X)].
|
|
|
+**
|
|
|
+** ^The [sqlite3_str_new(D)] interface always returns a pointer to a
|
|
|
+** valid [sqlite3_str] object, though in the event of an out-of-memory
|
|
|
+** error the returned object might be a special singleton that will
|
|
|
+** silently reject new text, always return SQLITE_NOMEM from
|
|
|
+** [sqlite3_str_errcode()], always return 0 for
|
|
|
+** [sqlite3_str_length()], and always return NULL from
|
|
|
+** [sqlite3_str_finish(X)]. It is always safe to use the value
|
|
|
+** returned by [sqlite3_str_new(D)] as the sqlite3_str parameter
|
|
|
+** to any of the other [sqlite3_str] methods.
|
|
|
+**
|
|
|
+** The D parameter to [sqlite3_str_new(D)] may be NULL. If the
|
|
|
+** D parameter in [sqlite3_str_new(D)] is not NULL, then the maximum
|
|
|
+** length of the string contained in the [sqlite3_str] object will be
|
|
|
+** the value set for [sqlite3_limit](D,[SQLITE_LIMIT_LENGTH]) instead
|
|
|
+** of [SQLITE_MAX_LENGTH].
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_str *sqlite3_str_new(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Finalize A Dynamic String
|
|
|
+** DESTRUCTOR: sqlite3_str
|
|
|
+**
|
|
|
+** ^The [sqlite3_str_finish(X)] interface destroys the sqlite3_str object X
|
|
|
+** and returns a pointer to a memory buffer obtained from [sqlite3_malloc64()]
|
|
|
+** that contains the constructed string. The calling application should
|
|
|
+** pass the returned value to [sqlite3_free()] to avoid a memory leak.
|
|
|
+** ^The [sqlite3_str_finish(X)] interface may return a NULL pointer if any
|
|
|
+** errors were encountered during construction of the string. ^The
|
|
|
+** [sqlite3_str_finish(X)] interface will also return a NULL pointer if the
|
|
|
+** string in [sqlite3_str] object X is zero bytes long.
|
|
|
+*/
|
|
|
+SQLITE_API char *sqlite3_str_finish(sqlite3_str*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Add Content To A Dynamic String
|
|
|
+** METHOD: sqlite3_str
|
|
|
+**
|
|
|
+** These interfaces add content to an sqlite3_str object previously obtained
|
|
|
+** from [sqlite3_str_new()].
|
|
|
+**
|
|
|
+** ^The [sqlite3_str_appendf(X,F,...)] and
|
|
|
+** [sqlite3_str_vappendf(X,F,V)] interfaces uses the [built-in printf]
|
|
|
+** functionality of SQLite to append formatted text onto the end of
|
|
|
+** [sqlite3_str] object X.
|
|
|
+**
|
|
|
+** ^The [sqlite3_str_append(X,S,N)] method appends exactly N bytes from string S
|
|
|
+** onto the end of the [sqlite3_str] object X. N must be non-negative.
|
|
|
+** S must contain at least N non-zero bytes of content. To append a
|
|
|
+** zero-terminated string in its entirety, use the [sqlite3_str_appendall()]
|
|
|
+** method instead.
|
|
|
+**
|
|
|
+** ^The [sqlite3_str_appendall(X,S)] method appends the complete content of
|
|
|
+** zero-terminated string S onto the end of [sqlite3_str] object X.
|
|
|
+**
|
|
|
+** ^The [sqlite3_str_appendchar(X,N,C)] method appends N copies of the
|
|
|
+** single-byte character C onto the end of [sqlite3_str] object X.
|
|
|
+** ^This method can be used, for example, to add whitespace indentation.
|
|
|
+**
|
|
|
+** ^The [sqlite3_str_reset(X)] method resets the string under construction
|
|
|
+** inside [sqlite3_str] object X back to zero bytes in length.
|
|
|
+**
|
|
|
+** These methods do not return a result code. ^If an error occurs, that fact
|
|
|
+** is recorded in the [sqlite3_str] object and can be recovered by a
|
|
|
+** subsequent call to [sqlite3_str_errcode(X)].
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_str_appendf(sqlite3_str*, const char *zFormat, ...);
|
|
|
+SQLITE_API void sqlite3_str_vappendf(sqlite3_str*, const char *zFormat, va_list);
|
|
|
+SQLITE_API void sqlite3_str_append(sqlite3_str*, const char *zIn, int N);
|
|
|
+SQLITE_API void sqlite3_str_appendall(sqlite3_str*, const char *zIn);
|
|
|
+SQLITE_API void sqlite3_str_appendchar(sqlite3_str*, int N, char C);
|
|
|
+SQLITE_API void sqlite3_str_reset(sqlite3_str*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Status Of A Dynamic String
|
|
|
+** METHOD: sqlite3_str
|
|
|
+**
|
|
|
+** These interfaces return the current status of an [sqlite3_str] object.
|
|
|
+**
|
|
|
+** ^If any prior errors have occurred while constructing the dynamic string
|
|
|
+** in sqlite3_str X, then the [sqlite3_str_errcode(X)] method will return
|
|
|
+** an appropriate error code. ^The [sqlite3_str_errcode(X)] method returns
|
|
|
+** [SQLITE_NOMEM] following any out-of-memory error, or
|
|
|
+** [SQLITE_TOOBIG] if the size of the dynamic string exceeds
|
|
|
+** [SQLITE_MAX_LENGTH], or [SQLITE_OK] if there have been no errors.
|
|
|
+**
|
|
|
+** ^The [sqlite3_str_length(X)] method returns the current length, in bytes,
|
|
|
+** of the dynamic string under construction in [sqlite3_str] object X.
|
|
|
+** ^The length returned by [sqlite3_str_length(X)] does not include the
|
|
|
+** zero-termination byte.
|
|
|
+**
|
|
|
+** ^The [sqlite3_str_value(X)] method returns a pointer to the current
|
|
|
+** content of the dynamic string under construction in X. The value
|
|
|
+** returned by [sqlite3_str_value(X)] is managed by the sqlite3_str object X
|
|
|
+** and might be freed or altered by any subsequent method on the same
|
|
|
+** [sqlite3_str] object. Applications must not used the pointer returned
|
|
|
+** [sqlite3_str_value(X)] after any subsequent method call on the same
|
|
|
+** object. ^Applications may change the content of the string returned
|
|
|
+** by [sqlite3_str_value(X)] as long as they do not write into any bytes
|
|
|
+** outside the range of 0 to [sqlite3_str_length(X)] and do not read or
|
|
|
+** write any byte after any subsequent sqlite3_str method call.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_str_errcode(sqlite3_str*);
|
|
|
+SQLITE_API int sqlite3_str_length(sqlite3_str*);
|
|
|
+SQLITE_API char *sqlite3_str_value(sqlite3_str*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: SQLite Runtime Status
|
|
|
+**
|
|
|
+** ^These interfaces are used to retrieve runtime status information
|
|
|
+** about the performance of SQLite, and optionally to reset various
|
|
|
+** highwater marks. ^The first argument is an integer code for
|
|
|
+** the specific parameter to measure. ^(Recognized integer codes
|
|
|
+** are of the form [status parameters | SQLITE_STATUS_...].)^
|
|
|
+** ^The current value of the parameter is returned into *pCurrent.
|
|
|
+** ^The highest recorded value is returned in *pHighwater. ^If the
|
|
|
+** resetFlag is true, then the highest record value is reset after
|
|
|
+** *pHighwater is written. ^(Some parameters do not record the highest
|
|
|
+** value. For those parameters
|
|
|
+** nothing is written into *pHighwater and the resetFlag is ignored.)^
|
|
|
+** ^(Other parameters record only the highwater mark and not the current
|
|
|
+** value. For these latter parameters nothing is written into *pCurrent.)^
|
|
|
+**
|
|
|
+** ^The sqlite3_status() and sqlite3_status64() routines return
|
|
|
+** SQLITE_OK on success and a non-zero [error code] on failure.
|
|
|
+**
|
|
|
+** If either the current value or the highwater mark is too large to
|
|
|
+** be represented by a 32-bit integer, then the values returned by
|
|
|
+** sqlite3_status() are undefined.
|
|
|
+**
|
|
|
+** See also: [sqlite3_db_status()]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_status(int op, int *pCurrent, int *pHighwater, int resetFlag);
|
|
|
+SQLITE_API int sqlite3_status64(
|
|
|
+ int op,
|
|
|
+ sqlite3_int64 *pCurrent,
|
|
|
+ sqlite3_int64 *pHighwater,
|
|
|
+ int resetFlag
|
|
|
+);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Status Parameters
|
|
|
+** KEYWORDS: {status parameters}
|
|
|
+**
|
|
|
+** These integer constants designate various run-time status parameters
|
|
|
+** that can be returned by [sqlite3_status()].
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_STATUS_MEMORY_USED]] ^(<dt>SQLITE_STATUS_MEMORY_USED</dt>
|
|
|
+** <dd>This parameter is the current amount of memory checked out
|
|
|
+** using [sqlite3_malloc()], either directly or indirectly. The
|
|
|
+** figure includes calls made to [sqlite3_malloc()] by the application
|
|
|
+** and internal memory usage by the SQLite library. Auxiliary page-cache
|
|
|
+** memory controlled by [SQLITE_CONFIG_PAGECACHE] is not included in
|
|
|
+** this parameter. The amount returned is the sum of the allocation
|
|
|
+** sizes as reported by the xSize method in [sqlite3_mem_methods].</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_STATUS_MALLOC_SIZE]] ^(<dt>SQLITE_STATUS_MALLOC_SIZE</dt>
|
|
|
+** <dd>This parameter records the largest memory allocation request
|
|
|
+** handed to [sqlite3_malloc()] or [sqlite3_realloc()] (or their
|
|
|
+** internal equivalents). Only the value returned in the
|
|
|
+** *pHighwater parameter to [sqlite3_status()] is of interest.
|
|
|
+** The value written into the *pCurrent parameter is undefined.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_STATUS_MALLOC_COUNT]] ^(<dt>SQLITE_STATUS_MALLOC_COUNT</dt>
|
|
|
+** <dd>This parameter records the number of separate memory allocations
|
|
|
+** currently checked out.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_STATUS_PAGECACHE_USED]] ^(<dt>SQLITE_STATUS_PAGECACHE_USED</dt>
|
|
|
+** <dd>This parameter returns the number of pages used out of the
|
|
|
+** [pagecache memory allocator] that was configured using
|
|
|
+** [SQLITE_CONFIG_PAGECACHE]. The
|
|
|
+** value returned is in pages, not in bytes.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_STATUS_PAGECACHE_OVERFLOW]]
|
|
|
+** ^(<dt>SQLITE_STATUS_PAGECACHE_OVERFLOW</dt>
|
|
|
+** <dd>This parameter returns the number of bytes of page cache
|
|
|
+** allocation which could not be satisfied by the [SQLITE_CONFIG_PAGECACHE]
|
|
|
+** buffer and where forced to overflow to [sqlite3_malloc()]. The
|
|
|
+** returned value includes allocations that overflowed because they
|
|
|
+** where too large (they were larger than the "sz" parameter to
|
|
|
+** [SQLITE_CONFIG_PAGECACHE]) and allocations that overflowed because
|
|
|
+** no space was left in the page cache.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_STATUS_PAGECACHE_SIZE]] ^(<dt>SQLITE_STATUS_PAGECACHE_SIZE</dt>
|
|
|
+** <dd>This parameter records the largest memory allocation request
|
|
|
+** handed to the [pagecache memory allocator]. Only the value returned in the
|
|
|
+** *pHighwater parameter to [sqlite3_status()] is of interest.
|
|
|
+** The value written into the *pCurrent parameter is undefined.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_STATUS_SCRATCH_USED]] <dt>SQLITE_STATUS_SCRATCH_USED</dt>
|
|
|
+** <dd>No longer used.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_STATUS_SCRATCH_OVERFLOW]] ^(<dt>SQLITE_STATUS_SCRATCH_OVERFLOW</dt>
|
|
|
+** <dd>No longer used.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_STATUS_SCRATCH_SIZE]] <dt>SQLITE_STATUS_SCRATCH_SIZE</dt>
|
|
|
+** <dd>No longer used.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_STATUS_PARSER_STACK]] ^(<dt>SQLITE_STATUS_PARSER_STACK</dt>
|
|
|
+** <dd>The *pHighwater parameter records the deepest parser stack.
|
|
|
+** The *pCurrent value is undefined. The *pHighwater value is only
|
|
|
+** meaningful if SQLite is compiled with [YYTRACKMAXSTACKDEPTH].</dd>)^
|
|
|
+** </dl>
|
|
|
+**
|
|
|
+** New status parameters may be added from time to time.
|
|
|
+*/
|
|
|
+#define SQLITE_STATUS_MEMORY_USED 0
|
|
|
+#define SQLITE_STATUS_PAGECACHE_USED 1
|
|
|
+#define SQLITE_STATUS_PAGECACHE_OVERFLOW 2
|
|
|
+#define SQLITE_STATUS_SCRATCH_USED 3 /* NOT USED */
|
|
|
+#define SQLITE_STATUS_SCRATCH_OVERFLOW 4 /* NOT USED */
|
|
|
+#define SQLITE_STATUS_MALLOC_SIZE 5
|
|
|
+#define SQLITE_STATUS_PARSER_STACK 6
|
|
|
+#define SQLITE_STATUS_PAGECACHE_SIZE 7
|
|
|
+#define SQLITE_STATUS_SCRATCH_SIZE 8 /* NOT USED */
|
|
|
+#define SQLITE_STATUS_MALLOC_COUNT 9
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Database Connection Status
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^This interface is used to retrieve runtime status information
|
|
|
+** about a single [database connection]. ^The first argument is the
|
|
|
+** database connection object to be interrogated. ^The second argument
|
|
|
+** is an integer constant, taken from the set of
|
|
|
+** [SQLITE_DBSTATUS options], that
|
|
|
+** determines the parameter to interrogate. The set of
|
|
|
+** [SQLITE_DBSTATUS options] is likely
|
|
|
+** to grow in future releases of SQLite.
|
|
|
+**
|
|
|
+** ^The current value of the requested parameter is written into *pCur
|
|
|
+** and the highest instantaneous value is written into *pHiwtr. ^If
|
|
|
+** the resetFlg is true, then the highest instantaneous value is
|
|
|
+** reset back down to the current value.
|
|
|
+**
|
|
|
+** ^The sqlite3_db_status() routine returns SQLITE_OK on success and a
|
|
|
+** non-zero [error code] on failure.
|
|
|
+**
|
|
|
+** See also: [sqlite3_status()] and [sqlite3_stmt_status()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_db_status(sqlite3*, int op, int *pCur, int *pHiwtr, int resetFlg);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Status Parameters for database connections
|
|
|
+** KEYWORDS: {SQLITE_DBSTATUS options}
|
|
|
+**
|
|
|
+** These constants are the available integer "verbs" that can be passed as
|
|
|
+** the second argument to the [sqlite3_db_status()] interface.
|
|
|
+**
|
|
|
+** New verbs may be added in future releases of SQLite. Existing verbs
|
|
|
+** might be discontinued. Applications should check the return code from
|
|
|
+** [sqlite3_db_status()] to make sure that the call worked.
|
|
|
+** The [sqlite3_db_status()] interface will return a non-zero error code
|
|
|
+** if a discontinued or unsupported verb is invoked.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_DBSTATUS_LOOKASIDE_USED]] ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_USED</dt>
|
|
|
+** <dd>This parameter returns the number of lookaside memory slots currently
|
|
|
+** checked out.</dd>)^
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_LOOKASIDE_HIT]] ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_HIT</dt>
|
|
|
+** <dd>This parameter returns the number of malloc attempts that were
|
|
|
+** satisfied using lookaside memory. Only the high-water value is meaningful;
|
|
|
+** the current value is always zero.)^
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE]]
|
|
|
+** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE</dt>
|
|
|
+** <dd>This parameter returns the number malloc attempts that might have
|
|
|
+** been satisfied using lookaside memory but failed due to the amount of
|
|
|
+** memory requested being larger than the lookaside slot size.
|
|
|
+** Only the high-water value is meaningful;
|
|
|
+** the current value is always zero.)^
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL]]
|
|
|
+** ^(<dt>SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL</dt>
|
|
|
+** <dd>This parameter returns the number malloc attempts that might have
|
|
|
+** been satisfied using lookaside memory but failed due to all lookaside
|
|
|
+** memory already being in use.
|
|
|
+** Only the high-water value is meaningful;
|
|
|
+** the current value is always zero.)^
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_CACHE_USED]] ^(<dt>SQLITE_DBSTATUS_CACHE_USED</dt>
|
|
|
+** <dd>This parameter returns the approximate number of bytes of heap
|
|
|
+** memory used by all pager caches associated with the database connection.)^
|
|
|
+** ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_USED is always 0.
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_CACHE_USED_SHARED]]
|
|
|
+** ^(<dt>SQLITE_DBSTATUS_CACHE_USED_SHARED</dt>
|
|
|
+** <dd>This parameter is similar to DBSTATUS_CACHE_USED, except that if a
|
|
|
+** pager cache is shared between two or more connections the bytes of heap
|
|
|
+** memory used by that pager cache is divided evenly between the attached
|
|
|
+** connections.)^ In other words, if none of the pager caches associated
|
|
|
+** with the database connection are shared, this request returns the same
|
|
|
+** value as DBSTATUS_CACHE_USED. Or, if one or more or the pager caches are
|
|
|
+** shared, the value returned by this call will be smaller than that returned
|
|
|
+** by DBSTATUS_CACHE_USED. ^The highwater mark associated with
|
|
|
+** SQLITE_DBSTATUS_CACHE_USED_SHARED is always 0.
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_SCHEMA_USED]] ^(<dt>SQLITE_DBSTATUS_SCHEMA_USED</dt>
|
|
|
+** <dd>This parameter returns the approximate number of bytes of heap
|
|
|
+** memory used to store the schema for all databases associated
|
|
|
+** with the connection - main, temp, and any [ATTACH]-ed databases.)^
|
|
|
+** ^The full amount of memory used by the schemas is reported, even if the
|
|
|
+** schema memory is shared with other database connections due to
|
|
|
+** [shared cache mode] being enabled.
|
|
|
+** ^The highwater mark associated with SQLITE_DBSTATUS_SCHEMA_USED is always 0.
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_STMT_USED]] ^(<dt>SQLITE_DBSTATUS_STMT_USED</dt>
|
|
|
+** <dd>This parameter returns the approximate number of bytes of heap
|
|
|
+** and lookaside memory used by all prepared statements associated with
|
|
|
+** the database connection.)^
|
|
|
+** ^The highwater mark associated with SQLITE_DBSTATUS_STMT_USED is always 0.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_CACHE_HIT]] ^(<dt>SQLITE_DBSTATUS_CACHE_HIT</dt>
|
|
|
+** <dd>This parameter returns the number of pager cache hits that have
|
|
|
+** occurred.)^ ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_HIT
|
|
|
+** is always 0.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_CACHE_MISS]] ^(<dt>SQLITE_DBSTATUS_CACHE_MISS</dt>
|
|
|
+** <dd>This parameter returns the number of pager cache misses that have
|
|
|
+** occurred.)^ ^The highwater mark associated with SQLITE_DBSTATUS_CACHE_MISS
|
|
|
+** is always 0.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_CACHE_WRITE]] ^(<dt>SQLITE_DBSTATUS_CACHE_WRITE</dt>
|
|
|
+** <dd>This parameter returns the number of dirty cache entries that have
|
|
|
+** been written to disk. Specifically, the number of pages written to the
|
|
|
+** wal file in wal mode databases, or the number of pages written to the
|
|
|
+** database file in rollback mode databases. Any pages written as part of
|
|
|
+** transaction rollback or database recovery operations are not included.
|
|
|
+** If an IO or other error occurs while writing a page to disk, the effect
|
|
|
+** on subsequent SQLITE_DBSTATUS_CACHE_WRITE requests is undefined.)^ ^The
|
|
|
+** highwater mark associated with SQLITE_DBSTATUS_CACHE_WRITE is always 0.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_CACHE_SPILL]] ^(<dt>SQLITE_DBSTATUS_CACHE_SPILL</dt>
|
|
|
+** <dd>This parameter returns the number of dirty cache entries that have
|
|
|
+** been written to disk in the middle of a transaction due to the page
|
|
|
+** cache overflowing. Transactions are more efficient if they are written
|
|
|
+** to disk all at once. When pages spill mid-transaction, that introduces
|
|
|
+** additional overhead. This parameter can be used help identify
|
|
|
+** inefficiencies that can be resolved by increasing the cache size.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_DBSTATUS_DEFERRED_FKS]] ^(<dt>SQLITE_DBSTATUS_DEFERRED_FKS</dt>
|
|
|
+** <dd>This parameter returns zero for the current value if and only if
|
|
|
+** all foreign key constraints (deferred or immediate) have been
|
|
|
+** resolved.)^ ^The highwater mark is always 0.
|
|
|
+** </dd>
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_DBSTATUS_LOOKASIDE_USED 0
|
|
|
+#define SQLITE_DBSTATUS_CACHE_USED 1
|
|
|
+#define SQLITE_DBSTATUS_SCHEMA_USED 2
|
|
|
+#define SQLITE_DBSTATUS_STMT_USED 3
|
|
|
+#define SQLITE_DBSTATUS_LOOKASIDE_HIT 4
|
|
|
+#define SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE 5
|
|
|
+#define SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL 6
|
|
|
+#define SQLITE_DBSTATUS_CACHE_HIT 7
|
|
|
+#define SQLITE_DBSTATUS_CACHE_MISS 8
|
|
|
+#define SQLITE_DBSTATUS_CACHE_WRITE 9
|
|
|
+#define SQLITE_DBSTATUS_DEFERRED_FKS 10
|
|
|
+#define SQLITE_DBSTATUS_CACHE_USED_SHARED 11
|
|
|
+#define SQLITE_DBSTATUS_CACHE_SPILL 12
|
|
|
+#define SQLITE_DBSTATUS_MAX 12 /* Largest defined DBSTATUS */
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Prepared Statement Status
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^(Each prepared statement maintains various
|
|
|
+** [SQLITE_STMTSTATUS counters] that measure the number
|
|
|
+** of times it has performed specific operations.)^ These counters can
|
|
|
+** be used to monitor the performance characteristics of the prepared
|
|
|
+** statements. For example, if the number of table steps greatly exceeds
|
|
|
+** the number of table searches or result rows, that would tend to indicate
|
|
|
+** that the prepared statement is using a full table scan rather than
|
|
|
+** an index.
|
|
|
+**
|
|
|
+** ^(This interface is used to retrieve and reset counter values from
|
|
|
+** a [prepared statement]. The first argument is the prepared statement
|
|
|
+** object to be interrogated. The second argument
|
|
|
+** is an integer code for a specific [SQLITE_STMTSTATUS counter]
|
|
|
+** to be interrogated.)^
|
|
|
+** ^The current value of the requested counter is returned.
|
|
|
+** ^If the resetFlg is true, then the counter is reset to zero after this
|
|
|
+** interface call returns.
|
|
|
+**
|
|
|
+** See also: [sqlite3_status()] and [sqlite3_db_status()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_stmt_status(sqlite3_stmt*, int op,int resetFlg);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Status Parameters for prepared statements
|
|
|
+** KEYWORDS: {SQLITE_STMTSTATUS counter} {SQLITE_STMTSTATUS counters}
|
|
|
+**
|
|
|
+** These preprocessor macros define integer codes that name counter
|
|
|
+** values associated with the [sqlite3_stmt_status()] interface.
|
|
|
+** The meanings of the various counters are as follows:
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_STMTSTATUS_FULLSCAN_STEP]] <dt>SQLITE_STMTSTATUS_FULLSCAN_STEP</dt>
|
|
|
+** <dd>^This is the number of times that SQLite has stepped forward in
|
|
|
+** a table as part of a full table scan. Large numbers for this counter
|
|
|
+** may indicate opportunities for performance improvement through
|
|
|
+** careful use of indices.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_STMTSTATUS_SORT]] <dt>SQLITE_STMTSTATUS_SORT</dt>
|
|
|
+** <dd>^This is the number of sort operations that have occurred.
|
|
|
+** A non-zero value in this counter may indicate an opportunity to
|
|
|
+** improvement performance through careful use of indices.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_STMTSTATUS_AUTOINDEX]] <dt>SQLITE_STMTSTATUS_AUTOINDEX</dt>
|
|
|
+** <dd>^This is the number of rows inserted into transient indices that
|
|
|
+** were created automatically in order to help joins run faster.
|
|
|
+** A non-zero value in this counter may indicate an opportunity to
|
|
|
+** improvement performance by adding permanent indices that do not
|
|
|
+** need to be reinitialized each time the statement is run.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_STMTSTATUS_VM_STEP]] <dt>SQLITE_STMTSTATUS_VM_STEP</dt>
|
|
|
+** <dd>^This is the number of virtual machine operations executed
|
|
|
+** by the prepared statement if that number is less than or equal
|
|
|
+** to 2147483647. The number of virtual machine operations can be
|
|
|
+** used as a proxy for the total work done by the prepared statement.
|
|
|
+** If the number of virtual machine operations exceeds 2147483647
|
|
|
+** then the value returned by this statement status code is undefined.
|
|
|
+**
|
|
|
+** [[SQLITE_STMTSTATUS_REPREPARE]] <dt>SQLITE_STMTSTATUS_REPREPARE</dt>
|
|
|
+** <dd>^This is the number of times that the prepare statement has been
|
|
|
+** automatically regenerated due to schema changes or changes to
|
|
|
+** [bound parameters] that might affect the query plan.
|
|
|
+**
|
|
|
+** [[SQLITE_STMTSTATUS_RUN]] <dt>SQLITE_STMTSTATUS_RUN</dt>
|
|
|
+** <dd>^This is the number of times that the prepared statement has
|
|
|
+** been run. A single "run" for the purposes of this counter is one
|
|
|
+** or more calls to [sqlite3_step()] followed by a call to [sqlite3_reset()].
|
|
|
+** The counter is incremented on the first [sqlite3_step()] call of each
|
|
|
+** cycle.
|
|
|
+**
|
|
|
+** [[SQLITE_STMTSTATUS_FILTER_MISS]]
|
|
|
+** [[SQLITE_STMTSTATUS_FILTER HIT]]
|
|
|
+** <dt>SQLITE_STMTSTATUS_FILTER_HIT<br>
|
|
|
+** SQLITE_STMTSTATUS_FILTER_MISS</dt>
|
|
|
+** <dd>^SQLITE_STMTSTATUS_FILTER_HIT is the number of times that a join
|
|
|
+** step was bypassed because a Bloom filter returned not-found. The
|
|
|
+** corresponding SQLITE_STMTSTATUS_FILTER_MISS value is the number of
|
|
|
+** times that the Bloom filter returned a find, and thus the join step
|
|
|
+** had to be processed as normal.
|
|
|
+**
|
|
|
+** [[SQLITE_STMTSTATUS_MEMUSED]] <dt>SQLITE_STMTSTATUS_MEMUSED</dt>
|
|
|
+** <dd>^This is the approximate number of bytes of heap memory
|
|
|
+** used to store the prepared statement. ^This value is not actually
|
|
|
+** a counter, and so the resetFlg parameter to sqlite3_stmt_status()
|
|
|
+** is ignored when the opcode is SQLITE_STMTSTATUS_MEMUSED.
|
|
|
+** </dd>
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_STMTSTATUS_FULLSCAN_STEP 1
|
|
|
+#define SQLITE_STMTSTATUS_SORT 2
|
|
|
+#define SQLITE_STMTSTATUS_AUTOINDEX 3
|
|
|
+#define SQLITE_STMTSTATUS_VM_STEP 4
|
|
|
+#define SQLITE_STMTSTATUS_REPREPARE 5
|
|
|
+#define SQLITE_STMTSTATUS_RUN 6
|
|
|
+#define SQLITE_STMTSTATUS_FILTER_MISS 7
|
|
|
+#define SQLITE_STMTSTATUS_FILTER_HIT 8
|
|
|
+#define SQLITE_STMTSTATUS_MEMUSED 99
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Custom Page Cache Object
|
|
|
+**
|
|
|
+** The sqlite3_pcache type is opaque. It is implemented by
|
|
|
+** the pluggable module. The SQLite core has no knowledge of
|
|
|
+** its size or internal structure and never deals with the
|
|
|
+** sqlite3_pcache object except by holding and passing pointers
|
|
|
+** to the object.
|
|
|
+**
|
|
|
+** See [sqlite3_pcache_methods2] for additional information.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_pcache sqlite3_pcache;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Custom Page Cache Object
|
|
|
+**
|
|
|
+** The sqlite3_pcache_page object represents a single page in the
|
|
|
+** page cache. The page cache will allocate instances of this
|
|
|
+** object. Various methods of the page cache use pointers to instances
|
|
|
+** of this object as parameters or as their return value.
|
|
|
+**
|
|
|
+** See [sqlite3_pcache_methods2] for additional information.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_pcache_page sqlite3_pcache_page;
|
|
|
+struct sqlite3_pcache_page {
|
|
|
+ void *pBuf; /* The content of the page */
|
|
|
+ void *pExtra; /* Extra information associated with the page */
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Application Defined Page Cache.
|
|
|
+** KEYWORDS: {page cache}
|
|
|
+**
|
|
|
+** ^(The [sqlite3_config]([SQLITE_CONFIG_PCACHE2], ...) interface can
|
|
|
+** register an alternative page cache implementation by passing in an
|
|
|
+** instance of the sqlite3_pcache_methods2 structure.)^
|
|
|
+** In many applications, most of the heap memory allocated by
|
|
|
+** SQLite is used for the page cache.
|
|
|
+** By implementing a
|
|
|
+** custom page cache using this API, an application can better control
|
|
|
+** the amount of memory consumed by SQLite, the way in which
|
|
|
+** that memory is allocated and released, and the policies used to
|
|
|
+** determine exactly which parts of a database file are cached and for
|
|
|
+** how long.
|
|
|
+**
|
|
|
+** The alternative page cache mechanism is an
|
|
|
+** extreme measure that is only needed by the most demanding applications.
|
|
|
+** The built-in page cache is recommended for most uses.
|
|
|
+**
|
|
|
+** ^(The contents of the sqlite3_pcache_methods2 structure are copied to an
|
|
|
+** internal buffer by SQLite within the call to [sqlite3_config]. Hence
|
|
|
+** the application may discard the parameter after the call to
|
|
|
+** [sqlite3_config()] returns.)^
|
|
|
+**
|
|
|
+** [[the xInit() page cache method]]
|
|
|
+** ^(The xInit() method is called once for each effective
|
|
|
+** call to [sqlite3_initialize()])^
|
|
|
+** (usually only once during the lifetime of the process). ^(The xInit()
|
|
|
+** method is passed a copy of the sqlite3_pcache_methods2.pArg value.)^
|
|
|
+** The intent of the xInit() method is to set up global data structures
|
|
|
+** required by the custom page cache implementation.
|
|
|
+** ^(If the xInit() method is NULL, then the
|
|
|
+** built-in default page cache is used instead of the application defined
|
|
|
+** page cache.)^
|
|
|
+**
|
|
|
+** [[the xShutdown() page cache method]]
|
|
|
+** ^The xShutdown() method is called by [sqlite3_shutdown()].
|
|
|
+** It can be used to clean up
|
|
|
+** any outstanding resources before process shutdown, if required.
|
|
|
+** ^The xShutdown() method may be NULL.
|
|
|
+**
|
|
|
+** ^SQLite automatically serializes calls to the xInit method,
|
|
|
+** so the xInit method need not be threadsafe. ^The
|
|
|
+** xShutdown method is only called from [sqlite3_shutdown()] so it does
|
|
|
+** not need to be threadsafe either. All other methods must be threadsafe
|
|
|
+** in multithreaded applications.
|
|
|
+**
|
|
|
+** ^SQLite will never invoke xInit() more than once without an intervening
|
|
|
+** call to xShutdown().
|
|
|
+**
|
|
|
+** [[the xCreate() page cache methods]]
|
|
|
+** ^SQLite invokes the xCreate() method to construct a new cache instance.
|
|
|
+** SQLite will typically create one cache instance for each open database file,
|
|
|
+** though this is not guaranteed. ^The
|
|
|
+** first parameter, szPage, is the size in bytes of the pages that must
|
|
|
+** be allocated by the cache. ^szPage will always a power of two. ^The
|
|
|
+** second parameter szExtra is a number of bytes of extra storage
|
|
|
+** associated with each page cache entry. ^The szExtra parameter will
|
|
|
+** a number less than 250. SQLite will use the
|
|
|
+** extra szExtra bytes on each page to store metadata about the underlying
|
|
|
+** database page on disk. The value passed into szExtra depends
|
|
|
+** on the SQLite version, the target platform, and how SQLite was compiled.
|
|
|
+** ^The third argument to xCreate(), bPurgeable, is true if the cache being
|
|
|
+** created will be used to cache database pages of a file stored on disk, or
|
|
|
+** false if it is used for an in-memory database. The cache implementation
|
|
|
+** does not have to do anything special based with the value of bPurgeable;
|
|
|
+** it is purely advisory. ^On a cache where bPurgeable is false, SQLite will
|
|
|
+** never invoke xUnpin() except to deliberately delete a page.
|
|
|
+** ^In other words, calls to xUnpin() on a cache with bPurgeable set to
|
|
|
+** false will always have the "discard" flag set to true.
|
|
|
+** ^Hence, a cache created with bPurgeable false will
|
|
|
+** never contain any unpinned pages.
|
|
|
+**
|
|
|
+** [[the xCachesize() page cache method]]
|
|
|
+** ^(The xCachesize() method may be called at any time by SQLite to set the
|
|
|
+** suggested maximum cache-size (number of pages stored by) the cache
|
|
|
+** instance passed as the first argument. This is the value configured using
|
|
|
+** the SQLite "[PRAGMA cache_size]" command.)^ As with the bPurgeable
|
|
|
+** parameter, the implementation is not required to do anything with this
|
|
|
+** value; it is advisory only.
|
|
|
+**
|
|
|
+** [[the xPagecount() page cache methods]]
|
|
|
+** The xPagecount() method must return the number of pages currently
|
|
|
+** stored in the cache, both pinned and unpinned.
|
|
|
+**
|
|
|
+** [[the xFetch() page cache methods]]
|
|
|
+** The xFetch() method locates a page in the cache and returns a pointer to
|
|
|
+** an sqlite3_pcache_page object associated with that page, or a NULL pointer.
|
|
|
+** The pBuf element of the returned sqlite3_pcache_page object will be a
|
|
|
+** pointer to a buffer of szPage bytes used to store the content of a
|
|
|
+** single database page. The pExtra element of sqlite3_pcache_page will be
|
|
|
+** a pointer to the szExtra bytes of extra storage that SQLite has requested
|
|
|
+** for each entry in the page cache.
|
|
|
+**
|
|
|
+** The page to be fetched is determined by the key. ^The minimum key value
|
|
|
+** is 1. After it has been retrieved using xFetch, the page is considered
|
|
|
+** to be "pinned".
|
|
|
+**
|
|
|
+** If the requested page is already in the page cache, then the page cache
|
|
|
+** implementation must return a pointer to the page buffer with its content
|
|
|
+** intact. If the requested page is not already in the cache, then the
|
|
|
+** cache implementation should use the value of the createFlag
|
|
|
+** parameter to help it determined what action to take:
|
|
|
+**
|
|
|
+** <table border=1 width=85% align=center>
|
|
|
+** <tr><th> createFlag <th> Behavior when page is not already in cache
|
|
|
+** <tr><td> 0 <td> Do not allocate a new page. Return NULL.
|
|
|
+** <tr><td> 1 <td> Allocate a new page if it easy and convenient to do so.
|
|
|
+** Otherwise return NULL.
|
|
|
+** <tr><td> 2 <td> Make every effort to allocate a new page. Only return
|
|
|
+** NULL if allocating a new page is effectively impossible.
|
|
|
+** </table>
|
|
|
+**
|
|
|
+** ^(SQLite will normally invoke xFetch() with a createFlag of 0 or 1. SQLite
|
|
|
+** will only use a createFlag of 2 after a prior call with a createFlag of 1
|
|
|
+** failed.)^ In between the xFetch() calls, SQLite may
|
|
|
+** attempt to unpin one or more cache pages by spilling the content of
|
|
|
+** pinned pages to disk and synching the operating system disk cache.
|
|
|
+**
|
|
|
+** [[the xUnpin() page cache method]]
|
|
|
+** ^xUnpin() is called by SQLite with a pointer to a currently pinned page
|
|
|
+** as its second argument. If the third parameter, discard, is non-zero,
|
|
|
+** then the page must be evicted from the cache.
|
|
|
+** ^If the discard parameter is
|
|
|
+** zero, then the page may be discarded or retained at the discretion of
|
|
|
+** page cache implementation. ^The page cache implementation
|
|
|
+** may choose to evict unpinned pages at any time.
|
|
|
+**
|
|
|
+** The cache must not perform any reference counting. A single
|
|
|
+** call to xUnpin() unpins the page regardless of the number of prior calls
|
|
|
+** to xFetch().
|
|
|
+**
|
|
|
+** [[the xRekey() page cache methods]]
|
|
|
+** The xRekey() method is used to change the key value associated with the
|
|
|
+** page passed as the second argument. If the cache
|
|
|
+** previously contains an entry associated with newKey, it must be
|
|
|
+** discarded. ^Any prior cache entry associated with newKey is guaranteed not
|
|
|
+** to be pinned.
|
|
|
+**
|
|
|
+** When SQLite calls the xTruncate() method, the cache must discard all
|
|
|
+** existing cache entries with page numbers (keys) greater than or equal
|
|
|
+** to the value of the iLimit parameter passed to xTruncate(). If any
|
|
|
+** of these pages are pinned, they are implicitly unpinned, meaning that
|
|
|
+** they can be safely discarded.
|
|
|
+**
|
|
|
+** [[the xDestroy() page cache method]]
|
|
|
+** ^The xDestroy() method is used to delete a cache allocated by xCreate().
|
|
|
+** All resources associated with the specified cache should be freed. ^After
|
|
|
+** calling the xDestroy() method, SQLite considers the [sqlite3_pcache*]
|
|
|
+** handle invalid, and will not use it with any other sqlite3_pcache_methods2
|
|
|
+** functions.
|
|
|
+**
|
|
|
+** [[the xShrink() page cache method]]
|
|
|
+** ^SQLite invokes the xShrink() method when it wants the page cache to
|
|
|
+** free up as much of heap memory as possible. The page cache implementation
|
|
|
+** is not obligated to free any memory, but well-behaved implementations should
|
|
|
+** do their best.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_pcache_methods2 sqlite3_pcache_methods2;
|
|
|
+struct sqlite3_pcache_methods2 {
|
|
|
+ int iVersion;
|
|
|
+ void *pArg;
|
|
|
+ int (*xInit)(void*);
|
|
|
+ void (*xShutdown)(void*);
|
|
|
+ sqlite3_pcache *(*xCreate)(int szPage, int szExtra, int bPurgeable);
|
|
|
+ void (*xCachesize)(sqlite3_pcache*, int nCachesize);
|
|
|
+ int (*xPagecount)(sqlite3_pcache*);
|
|
|
+ sqlite3_pcache_page *(*xFetch)(sqlite3_pcache*, unsigned key, int createFlag);
|
|
|
+ void (*xUnpin)(sqlite3_pcache*, sqlite3_pcache_page*, int discard);
|
|
|
+ void (*xRekey)(sqlite3_pcache*, sqlite3_pcache_page*,
|
|
|
+ unsigned oldKey, unsigned newKey);
|
|
|
+ void (*xTruncate)(sqlite3_pcache*, unsigned iLimit);
|
|
|
+ void (*xDestroy)(sqlite3_pcache*);
|
|
|
+ void (*xShrink)(sqlite3_pcache*);
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** This is the obsolete pcache_methods object that has now been replaced
|
|
|
+** by sqlite3_pcache_methods2. This object is not used by SQLite. It is
|
|
|
+** retained in the header file for backwards compatibility only.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_pcache_methods sqlite3_pcache_methods;
|
|
|
+struct sqlite3_pcache_methods {
|
|
|
+ void *pArg;
|
|
|
+ int (*xInit)(void*);
|
|
|
+ void (*xShutdown)(void*);
|
|
|
+ sqlite3_pcache *(*xCreate)(int szPage, int bPurgeable);
|
|
|
+ void (*xCachesize)(sqlite3_pcache*, int nCachesize);
|
|
|
+ int (*xPagecount)(sqlite3_pcache*);
|
|
|
+ void *(*xFetch)(sqlite3_pcache*, unsigned key, int createFlag);
|
|
|
+ void (*xUnpin)(sqlite3_pcache*, void*, int discard);
|
|
|
+ void (*xRekey)(sqlite3_pcache*, void*, unsigned oldKey, unsigned newKey);
|
|
|
+ void (*xTruncate)(sqlite3_pcache*, unsigned iLimit);
|
|
|
+ void (*xDestroy)(sqlite3_pcache*);
|
|
|
+};
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Online Backup Object
|
|
|
+**
|
|
|
+** The sqlite3_backup object records state information about an ongoing
|
|
|
+** online backup operation. ^The sqlite3_backup object is created by
|
|
|
+** a call to [sqlite3_backup_init()] and is destroyed by a call to
|
|
|
+** [sqlite3_backup_finish()].
|
|
|
+**
|
|
|
+** See Also: [Using the SQLite Online Backup API]
|
|
|
+*/
|
|
|
+typedef struct sqlite3_backup sqlite3_backup;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Online Backup API.
|
|
|
+**
|
|
|
+** The backup API copies the content of one database into another.
|
|
|
+** It is useful either for creating backups of databases or
|
|
|
+** for copying in-memory databases to or from persistent files.
|
|
|
+**
|
|
|
+** See Also: [Using the SQLite Online Backup API]
|
|
|
+**
|
|
|
+** ^SQLite holds a write transaction open on the destination database file
|
|
|
+** for the duration of the backup operation.
|
|
|
+** ^The source database is read-locked only while it is being read;
|
|
|
+** it is not locked continuously for the entire backup operation.
|
|
|
+** ^Thus, the backup may be performed on a live source database without
|
|
|
+** preventing other database connections from
|
|
|
+** reading or writing to the source database while the backup is underway.
|
|
|
+**
|
|
|
+** ^(To perform a backup operation:
|
|
|
+** <ol>
|
|
|
+** <li><b>sqlite3_backup_init()</b> is called once to initialize the
|
|
|
+** backup,
|
|
|
+** <li><b>sqlite3_backup_step()</b> is called one or more times to transfer
|
|
|
+** the data between the two databases, and finally
|
|
|
+** <li><b>sqlite3_backup_finish()</b> is called to release all resources
|
|
|
+** associated with the backup operation.
|
|
|
+** </ol>)^
|
|
|
+** There should be exactly one call to sqlite3_backup_finish() for each
|
|
|
+** successful call to sqlite3_backup_init().
|
|
|
+**
|
|
|
+** [[sqlite3_backup_init()]] <b>sqlite3_backup_init()</b>
|
|
|
+**
|
|
|
+** ^The D and N arguments to sqlite3_backup_init(D,N,S,M) are the
|
|
|
+** [database connection] associated with the destination database
|
|
|
+** and the database name, respectively.
|
|
|
+** ^The database name is "main" for the main database, "temp" for the
|
|
|
+** temporary database, or the name specified after the AS keyword in
|
|
|
+** an [ATTACH] statement for an attached database.
|
|
|
+** ^The S and M arguments passed to
|
|
|
+** sqlite3_backup_init(D,N,S,M) identify the [database connection]
|
|
|
+** and database name of the source database, respectively.
|
|
|
+** ^The source and destination [database connections] (parameters S and D)
|
|
|
+** must be different or else sqlite3_backup_init(D,N,S,M) will fail with
|
|
|
+** an error.
|
|
|
+**
|
|
|
+** ^A call to sqlite3_backup_init() will fail, returning NULL, if
|
|
|
+** there is already a read or read-write transaction open on the
|
|
|
+** destination database.
|
|
|
+**
|
|
|
+** ^If an error occurs within sqlite3_backup_init(D,N,S,M), then NULL is
|
|
|
+** returned and an error code and error message are stored in the
|
|
|
+** destination [database connection] D.
|
|
|
+** ^The error code and message for the failed call to sqlite3_backup_init()
|
|
|
+** can be retrieved using the [sqlite3_errcode()], [sqlite3_errmsg()], and/or
|
|
|
+** [sqlite3_errmsg16()] functions.
|
|
|
+** ^A successful call to sqlite3_backup_init() returns a pointer to an
|
|
|
+** [sqlite3_backup] object.
|
|
|
+** ^The [sqlite3_backup] object may be used with the sqlite3_backup_step() and
|
|
|
+** sqlite3_backup_finish() functions to perform the specified backup
|
|
|
+** operation.
|
|
|
+**
|
|
|
+** [[sqlite3_backup_step()]] <b>sqlite3_backup_step()</b>
|
|
|
+**
|
|
|
+** ^Function sqlite3_backup_step(B,N) will copy up to N pages between
|
|
|
+** the source and destination databases specified by [sqlite3_backup] object B.
|
|
|
+** ^If N is negative, all remaining source pages are copied.
|
|
|
+** ^If sqlite3_backup_step(B,N) successfully copies N pages and there
|
|
|
+** are still more pages to be copied, then the function returns [SQLITE_OK].
|
|
|
+** ^If sqlite3_backup_step(B,N) successfully finishes copying all pages
|
|
|
+** from source to destination, then it returns [SQLITE_DONE].
|
|
|
+** ^If an error occurs while running sqlite3_backup_step(B,N),
|
|
|
+** then an [error code] is returned. ^As well as [SQLITE_OK] and
|
|
|
+** [SQLITE_DONE], a call to sqlite3_backup_step() may return [SQLITE_READONLY],
|
|
|
+** [SQLITE_NOMEM], [SQLITE_BUSY], [SQLITE_LOCKED], or an
|
|
|
+** [SQLITE_IOERR_ACCESS | SQLITE_IOERR_XXX] extended error code.
|
|
|
+**
|
|
|
+** ^(The sqlite3_backup_step() might return [SQLITE_READONLY] if
|
|
|
+** <ol>
|
|
|
+** <li> the destination database was opened read-only, or
|
|
|
+** <li> the destination database is using write-ahead-log journaling
|
|
|
+** and the destination and source page sizes differ, or
|
|
|
+** <li> the destination database is an in-memory database and the
|
|
|
+** destination and source page sizes differ.
|
|
|
+** </ol>)^
|
|
|
+**
|
|
|
+** ^If sqlite3_backup_step() cannot obtain a required file-system lock, then
|
|
|
+** the [sqlite3_busy_handler | busy-handler function]
|
|
|
+** is invoked (if one is specified). ^If the
|
|
|
+** busy-handler returns non-zero before the lock is available, then
|
|
|
+** [SQLITE_BUSY] is returned to the caller. ^In this case the call to
|
|
|
+** sqlite3_backup_step() can be retried later. ^If the source
|
|
|
+** [database connection]
|
|
|
+** is being used to write to the source database when sqlite3_backup_step()
|
|
|
+** is called, then [SQLITE_LOCKED] is returned immediately. ^Again, in this
|
|
|
+** case the call to sqlite3_backup_step() can be retried later on. ^(If
|
|
|
+** [SQLITE_IOERR_ACCESS | SQLITE_IOERR_XXX], [SQLITE_NOMEM], or
|
|
|
+** [SQLITE_READONLY] is returned, then
|
|
|
+** there is no point in retrying the call to sqlite3_backup_step(). These
|
|
|
+** errors are considered fatal.)^ The application must accept
|
|
|
+** that the backup operation has failed and pass the backup operation handle
|
|
|
+** to the sqlite3_backup_finish() to release associated resources.
|
|
|
+**
|
|
|
+** ^The first call to sqlite3_backup_step() obtains an exclusive lock
|
|
|
+** on the destination file. ^The exclusive lock is not released until either
|
|
|
+** sqlite3_backup_finish() is called or the backup operation is complete
|
|
|
+** and sqlite3_backup_step() returns [SQLITE_DONE]. ^Every call to
|
|
|
+** sqlite3_backup_step() obtains a [shared lock] on the source database that
|
|
|
+** lasts for the duration of the sqlite3_backup_step() call.
|
|
|
+** ^Because the source database is not locked between calls to
|
|
|
+** sqlite3_backup_step(), the source database may be modified mid-way
|
|
|
+** through the backup process. ^If the source database is modified by an
|
|
|
+** external process or via a database connection other than the one being
|
|
|
+** used by the backup operation, then the backup will be automatically
|
|
|
+** restarted by the next call to sqlite3_backup_step(). ^If the source
|
|
|
+** database is modified by the using the same database connection as is used
|
|
|
+** by the backup operation, then the backup database is automatically
|
|
|
+** updated at the same time.
|
|
|
+**
|
|
|
+** [[sqlite3_backup_finish()]] <b>sqlite3_backup_finish()</b>
|
|
|
+**
|
|
|
+** When sqlite3_backup_step() has returned [SQLITE_DONE], or when the
|
|
|
+** application wishes to abandon the backup operation, the application
|
|
|
+** should destroy the [sqlite3_backup] by passing it to sqlite3_backup_finish().
|
|
|
+** ^The sqlite3_backup_finish() interfaces releases all
|
|
|
+** resources associated with the [sqlite3_backup] object.
|
|
|
+** ^If sqlite3_backup_step() has not yet returned [SQLITE_DONE], then any
|
|
|
+** active write-transaction on the destination database is rolled back.
|
|
|
+** The [sqlite3_backup] object is invalid
|
|
|
+** and may not be used following a call to sqlite3_backup_finish().
|
|
|
+**
|
|
|
+** ^The value returned by sqlite3_backup_finish is [SQLITE_OK] if no
|
|
|
+** sqlite3_backup_step() errors occurred, regardless or whether or not
|
|
|
+** sqlite3_backup_step() completed.
|
|
|
+** ^If an out-of-memory condition or IO error occurred during any prior
|
|
|
+** sqlite3_backup_step() call on the same [sqlite3_backup] object, then
|
|
|
+** sqlite3_backup_finish() returns the corresponding [error code].
|
|
|
+**
|
|
|
+** ^A return of [SQLITE_BUSY] or [SQLITE_LOCKED] from sqlite3_backup_step()
|
|
|
+** is not a permanent error and does not affect the return value of
|
|
|
+** sqlite3_backup_finish().
|
|
|
+**
|
|
|
+** [[sqlite3_backup_remaining()]] [[sqlite3_backup_pagecount()]]
|
|
|
+** <b>sqlite3_backup_remaining() and sqlite3_backup_pagecount()</b>
|
|
|
+**
|
|
|
+** ^The sqlite3_backup_remaining() routine returns the number of pages still
|
|
|
+** to be backed up at the conclusion of the most recent sqlite3_backup_step().
|
|
|
+** ^The sqlite3_backup_pagecount() routine returns the total number of pages
|
|
|
+** in the source database at the conclusion of the most recent
|
|
|
+** sqlite3_backup_step().
|
|
|
+** ^(The values returned by these functions are only updated by
|
|
|
+** sqlite3_backup_step(). If the source database is modified in a way that
|
|
|
+** changes the size of the source database or the number of pages remaining,
|
|
|
+** those changes are not reflected in the output of sqlite3_backup_pagecount()
|
|
|
+** and sqlite3_backup_remaining() until after the next
|
|
|
+** sqlite3_backup_step().)^
|
|
|
+**
|
|
|
+** <b>Concurrent Usage of Database Handles</b>
|
|
|
+**
|
|
|
+** ^The source [database connection] may be used by the application for other
|
|
|
+** purposes while a backup operation is underway or being initialized.
|
|
|
+** ^If SQLite is compiled and configured to support threadsafe database
|
|
|
+** connections, then the source database connection may be used concurrently
|
|
|
+** from within other threads.
|
|
|
+**
|
|
|
+** However, the application must guarantee that the destination
|
|
|
+** [database connection] is not passed to any other API (by any thread) after
|
|
|
+** sqlite3_backup_init() is called and before the corresponding call to
|
|
|
+** sqlite3_backup_finish(). SQLite does not currently check to see
|
|
|
+** if the application incorrectly accesses the destination [database connection]
|
|
|
+** and so no error code is reported, but the operations may malfunction
|
|
|
+** nevertheless. Use of the destination database connection while a
|
|
|
+** backup is in progress might also also cause a mutex deadlock.
|
|
|
+**
|
|
|
+** If running in [shared cache mode], the application must
|
|
|
+** guarantee that the shared cache used by the destination database
|
|
|
+** is not accessed while the backup is running. In practice this means
|
|
|
+** that the application must guarantee that the disk file being
|
|
|
+** backed up to is not accessed by any connection within the process,
|
|
|
+** not just the specific connection that was passed to sqlite3_backup_init().
|
|
|
+**
|
|
|
+** The [sqlite3_backup] object itself is partially threadsafe. Multiple
|
|
|
+** threads may safely make multiple concurrent calls to sqlite3_backup_step().
|
|
|
+** However, the sqlite3_backup_remaining() and sqlite3_backup_pagecount()
|
|
|
+** APIs are not strictly speaking threadsafe. If they are invoked at the
|
|
|
+** same time as another thread is invoking sqlite3_backup_step() it is
|
|
|
+** possible that they return invalid values.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_backup *sqlite3_backup_init(
|
|
|
+ sqlite3 *pDest, /* Destination database handle */
|
|
|
+ const char *zDestName, /* Destination database name */
|
|
|
+ sqlite3 *pSource, /* Source database handle */
|
|
|
+ const char *zSourceName /* Source database name */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_backup_step(sqlite3_backup *p, int nPage);
|
|
|
+SQLITE_API int sqlite3_backup_finish(sqlite3_backup *p);
|
|
|
+SQLITE_API int sqlite3_backup_remaining(sqlite3_backup *p);
|
|
|
+SQLITE_API int sqlite3_backup_pagecount(sqlite3_backup *p);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Unlock Notification
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^When running in shared-cache mode, a database operation may fail with
|
|
|
+** an [SQLITE_LOCKED] error if the required locks on the shared-cache or
|
|
|
+** individual tables within the shared-cache cannot be obtained. See
|
|
|
+** [SQLite Shared-Cache Mode] for a description of shared-cache locking.
|
|
|
+** ^This API may be used to register a callback that SQLite will invoke
|
|
|
+** when the connection currently holding the required lock relinquishes it.
|
|
|
+** ^This API is only available if the library was compiled with the
|
|
|
+** [SQLITE_ENABLE_UNLOCK_NOTIFY] C-preprocessor symbol defined.
|
|
|
+**
|
|
|
+** See Also: [Using the SQLite Unlock Notification Feature].
|
|
|
+**
|
|
|
+** ^Shared-cache locks are released when a database connection concludes
|
|
|
+** its current transaction, either by committing it or rolling it back.
|
|
|
+**
|
|
|
+** ^When a connection (known as the blocked connection) fails to obtain a
|
|
|
+** shared-cache lock and SQLITE_LOCKED is returned to the caller, the
|
|
|
+** identity of the database connection (the blocking connection) that
|
|
|
+** has locked the required resource is stored internally. ^After an
|
|
|
+** application receives an SQLITE_LOCKED error, it may call the
|
|
|
+** sqlite3_unlock_notify() method with the blocked connection handle as
|
|
|
+** the first argument to register for a callback that will be invoked
|
|
|
+** when the blocking connections current transaction is concluded. ^The
|
|
|
+** callback is invoked from within the [sqlite3_step] or [sqlite3_close]
|
|
|
+** call that concludes the blocking connection's transaction.
|
|
|
+**
|
|
|
+** ^(If sqlite3_unlock_notify() is called in a multi-threaded application,
|
|
|
+** there is a chance that the blocking connection will have already
|
|
|
+** concluded its transaction by the time sqlite3_unlock_notify() is invoked.
|
|
|
+** If this happens, then the specified callback is invoked immediately,
|
|
|
+** from within the call to sqlite3_unlock_notify().)^
|
|
|
+**
|
|
|
+** ^If the blocked connection is attempting to obtain a write-lock on a
|
|
|
+** shared-cache table, and more than one other connection currently holds
|
|
|
+** a read-lock on the same table, then SQLite arbitrarily selects one of
|
|
|
+** the other connections to use as the blocking connection.
|
|
|
+**
|
|
|
+** ^(There may be at most one unlock-notify callback registered by a
|
|
|
+** blocked connection. If sqlite3_unlock_notify() is called when the
|
|
|
+** blocked connection already has a registered unlock-notify callback,
|
|
|
+** then the new callback replaces the old.)^ ^If sqlite3_unlock_notify() is
|
|
|
+** called with a NULL pointer as its second argument, then any existing
|
|
|
+** unlock-notify callback is canceled. ^The blocked connections
|
|
|
+** unlock-notify callback may also be canceled by closing the blocked
|
|
|
+** connection using [sqlite3_close()].
|
|
|
+**
|
|
|
+** The unlock-notify callback is not reentrant. If an application invokes
|
|
|
+** any sqlite3_xxx API functions from within an unlock-notify callback, a
|
|
|
+** crash or deadlock may be the result.
|
|
|
+**
|
|
|
+** ^Unless deadlock is detected (see below), sqlite3_unlock_notify() always
|
|
|
+** returns SQLITE_OK.
|
|
|
+**
|
|
|
+** <b>Callback Invocation Details</b>
|
|
|
+**
|
|
|
+** When an unlock-notify callback is registered, the application provides a
|
|
|
+** single void* pointer that is passed to the callback when it is invoked.
|
|
|
+** However, the signature of the callback function allows SQLite to pass
|
|
|
+** it an array of void* context pointers. The first argument passed to
|
|
|
+** an unlock-notify callback is a pointer to an array of void* pointers,
|
|
|
+** and the second is the number of entries in the array.
|
|
|
+**
|
|
|
+** When a blocking connection's transaction is concluded, there may be
|
|
|
+** more than one blocked connection that has registered for an unlock-notify
|
|
|
+** callback. ^If two or more such blocked connections have specified the
|
|
|
+** same callback function, then instead of invoking the callback function
|
|
|
+** multiple times, it is invoked once with the set of void* context pointers
|
|
|
+** specified by the blocked connections bundled together into an array.
|
|
|
+** This gives the application an opportunity to prioritize any actions
|
|
|
+** related to the set of unblocked database connections.
|
|
|
+**
|
|
|
+** <b>Deadlock Detection</b>
|
|
|
+**
|
|
|
+** Assuming that after registering for an unlock-notify callback a
|
|
|
+** database waits for the callback to be issued before taking any further
|
|
|
+** action (a reasonable assumption), then using this API may cause the
|
|
|
+** application to deadlock. For example, if connection X is waiting for
|
|
|
+** connection Y's transaction to be concluded, and similarly connection
|
|
|
+** Y is waiting on connection X's transaction, then neither connection
|
|
|
+** will proceed and the system may remain deadlocked indefinitely.
|
|
|
+**
|
|
|
+** To avoid this scenario, the sqlite3_unlock_notify() performs deadlock
|
|
|
+** detection. ^If a given call to sqlite3_unlock_notify() would put the
|
|
|
+** system in a deadlocked state, then SQLITE_LOCKED is returned and no
|
|
|
+** unlock-notify callback is registered. The system is said to be in
|
|
|
+** a deadlocked state if connection A has registered for an unlock-notify
|
|
|
+** callback on the conclusion of connection B's transaction, and connection
|
|
|
+** B has itself registered for an unlock-notify callback when connection
|
|
|
+** A's transaction is concluded. ^Indirect deadlock is also detected, so
|
|
|
+** the system is also considered to be deadlocked if connection B has
|
|
|
+** registered for an unlock-notify callback on the conclusion of connection
|
|
|
+** C's transaction, where connection C is waiting on connection A. ^Any
|
|
|
+** number of levels of indirection are allowed.
|
|
|
+**
|
|
|
+** <b>The "DROP TABLE" Exception</b>
|
|
|
+**
|
|
|
+** When a call to [sqlite3_step()] returns SQLITE_LOCKED, it is almost
|
|
|
+** always appropriate to call sqlite3_unlock_notify(). There is however,
|
|
|
+** one exception. When executing a "DROP TABLE" or "DROP INDEX" statement,
|
|
|
+** SQLite checks if there are any currently executing SELECT statements
|
|
|
+** that belong to the same connection. If there are, SQLITE_LOCKED is
|
|
|
+** returned. In this case there is no "blocking connection", so invoking
|
|
|
+** sqlite3_unlock_notify() results in the unlock-notify callback being
|
|
|
+** invoked immediately. If the application then re-attempts the "DROP TABLE"
|
|
|
+** or "DROP INDEX" query, an infinite loop might be the result.
|
|
|
+**
|
|
|
+** One way around this problem is to check the extended error code returned
|
|
|
+** by an sqlite3_step() call. ^(If there is a blocking connection, then the
|
|
|
+** extended error code is set to SQLITE_LOCKED_SHAREDCACHE. Otherwise, in
|
|
|
+** the special "DROP TABLE/INDEX" case, the extended error code is just
|
|
|
+** SQLITE_LOCKED.)^
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_unlock_notify(
|
|
|
+ sqlite3 *pBlocked, /* Waiting connection */
|
|
|
+ void (*xNotify)(void **apArg, int nArg), /* Callback function to invoke */
|
|
|
+ void *pNotifyArg /* Argument to pass to xNotify */
|
|
|
+);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: String Comparison
|
|
|
+**
|
|
|
+** ^The [sqlite3_stricmp()] and [sqlite3_strnicmp()] APIs allow applications
|
|
|
+** and extensions to compare the contents of two buffers containing UTF-8
|
|
|
+** strings in a case-independent fashion, using the same definition of "case
|
|
|
+** independence" that SQLite uses internally when comparing identifiers.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_stricmp(const char *, const char *);
|
|
|
+SQLITE_API int sqlite3_strnicmp(const char *, const char *, int);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: String Globbing
|
|
|
+*
|
|
|
+** ^The [sqlite3_strglob(P,X)] interface returns zero if and only if
|
|
|
+** string X matches the [GLOB] pattern P.
|
|
|
+** ^The definition of [GLOB] pattern matching used in
|
|
|
+** [sqlite3_strglob(P,X)] is the same as for the "X GLOB P" operator in the
|
|
|
+** SQL dialect understood by SQLite. ^The [sqlite3_strglob(P,X)] function
|
|
|
+** is case sensitive.
|
|
|
+**
|
|
|
+** Note that this routine returns zero on a match and non-zero if the strings
|
|
|
+** do not match, the same as [sqlite3_stricmp()] and [sqlite3_strnicmp()].
|
|
|
+**
|
|
|
+** See also: [sqlite3_strlike()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_strglob(const char *zGlob, const char *zStr);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: String LIKE Matching
|
|
|
+*
|
|
|
+** ^The [sqlite3_strlike(P,X,E)] interface returns zero if and only if
|
|
|
+** string X matches the [LIKE] pattern P with escape character E.
|
|
|
+** ^The definition of [LIKE] pattern matching used in
|
|
|
+** [sqlite3_strlike(P,X,E)] is the same as for the "X LIKE P ESCAPE E"
|
|
|
+** operator in the SQL dialect understood by SQLite. ^For "X LIKE P" without
|
|
|
+** the ESCAPE clause, set the E parameter of [sqlite3_strlike(P,X,E)] to 0.
|
|
|
+** ^As with the LIKE operator, the [sqlite3_strlike(P,X,E)] function is case
|
|
|
+** insensitive - equivalent upper and lower case ASCII characters match
|
|
|
+** one another.
|
|
|
+**
|
|
|
+** ^The [sqlite3_strlike(P,X,E)] function matches Unicode characters, though
|
|
|
+** only ASCII characters are case folded.
|
|
|
+**
|
|
|
+** Note that this routine returns zero on a match and non-zero if the strings
|
|
|
+** do not match, the same as [sqlite3_stricmp()] and [sqlite3_strnicmp()].
|
|
|
+**
|
|
|
+** See also: [sqlite3_strglob()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_strlike(const char *zGlob, const char *zStr, unsigned int cEsc);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Error Logging Interface
|
|
|
+**
|
|
|
+** ^The [sqlite3_log()] interface writes a message into the [error log]
|
|
|
+** established by the [SQLITE_CONFIG_LOG] option to [sqlite3_config()].
|
|
|
+** ^If logging is enabled, the zFormat string and subsequent arguments are
|
|
|
+** used with [sqlite3_snprintf()] to generate the final output string.
|
|
|
+**
|
|
|
+** The sqlite3_log() interface is intended for use by extensions such as
|
|
|
+** virtual tables, collating functions, and SQL functions. While there is
|
|
|
+** nothing to prevent an application from calling sqlite3_log(), doing so
|
|
|
+** is considered bad form.
|
|
|
+**
|
|
|
+** The zFormat string must not be NULL.
|
|
|
+**
|
|
|
+** To avoid deadlocks and other threading problems, the sqlite3_log() routine
|
|
|
+** will not use dynamically allocated memory. The log message is stored in
|
|
|
+** a fixed-length buffer on the stack. If the log message is longer than
|
|
|
+** a few hundred characters, it will be truncated to the length of the
|
|
|
+** buffer.
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_log(int iErrCode, const char *zFormat, ...);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Write-Ahead Log Commit Hook
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The [sqlite3_wal_hook()] function is used to register a callback that
|
|
|
+** is invoked each time data is committed to a database in wal mode.
|
|
|
+**
|
|
|
+** ^(The callback is invoked by SQLite after the commit has taken place and
|
|
|
+** the associated write-lock on the database released)^, so the implementation
|
|
|
+** may read, write or [checkpoint] the database as required.
|
|
|
+**
|
|
|
+** ^The first parameter passed to the callback function when it is invoked
|
|
|
+** is a copy of the third parameter passed to sqlite3_wal_hook() when
|
|
|
+** registering the callback. ^The second is a copy of the database handle.
|
|
|
+** ^The third parameter is the name of the database that was written to -
|
|
|
+** either "main" or the name of an [ATTACH]-ed database. ^The fourth parameter
|
|
|
+** is the number of pages currently in the write-ahead log file,
|
|
|
+** including those that were just committed.
|
|
|
+**
|
|
|
+** The callback function should normally return [SQLITE_OK]. ^If an error
|
|
|
+** code is returned, that error will propagate back up through the
|
|
|
+** SQLite code base to cause the statement that provoked the callback
|
|
|
+** to report an error, though the commit will have still occurred. If the
|
|
|
+** callback returns [SQLITE_ROW] or [SQLITE_DONE], or if it returns a value
|
|
|
+** that does not correspond to any valid SQLite error code, the results
|
|
|
+** are undefined.
|
|
|
+**
|
|
|
+** A single database handle may have at most a single write-ahead log callback
|
|
|
+** registered at one time. ^Calling [sqlite3_wal_hook()] replaces any
|
|
|
+** previously registered write-ahead log callback. ^The return value is
|
|
|
+** a copy of the third parameter from the previous call, if any, or 0.
|
|
|
+** ^Note that the [sqlite3_wal_autocheckpoint()] interface and the
|
|
|
+** [wal_autocheckpoint pragma] both invoke [sqlite3_wal_hook()] and will
|
|
|
+** overwrite any prior [sqlite3_wal_hook()] settings.
|
|
|
+*/
|
|
|
+SQLITE_API void *sqlite3_wal_hook(
|
|
|
+ sqlite3*,
|
|
|
+ int(*)(void *,sqlite3*,const char*,int),
|
|
|
+ void*
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Configure an auto-checkpoint
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^The [sqlite3_wal_autocheckpoint(D,N)] is a wrapper around
|
|
|
+** [sqlite3_wal_hook()] that causes any database on [database connection] D
|
|
|
+** to automatically [checkpoint]
|
|
|
+** after committing a transaction if there are N or
|
|
|
+** more frames in the [write-ahead log] file. ^Passing zero or
|
|
|
+** a negative value as the nFrame parameter disables automatic
|
|
|
+** checkpoints entirely.
|
|
|
+**
|
|
|
+** ^The callback registered by this function replaces any existing callback
|
|
|
+** registered using [sqlite3_wal_hook()]. ^Likewise, registering a callback
|
|
|
+** using [sqlite3_wal_hook()] disables the automatic checkpoint mechanism
|
|
|
+** configured by this function.
|
|
|
+**
|
|
|
+** ^The [wal_autocheckpoint pragma] can be used to invoke this interface
|
|
|
+** from SQL.
|
|
|
+**
|
|
|
+** ^Checkpoints initiated by this mechanism are
|
|
|
+** [sqlite3_wal_checkpoint_v2|PASSIVE].
|
|
|
+**
|
|
|
+** ^Every new [database connection] defaults to having the auto-checkpoint
|
|
|
+** enabled with a threshold of 1000 or [SQLITE_DEFAULT_WAL_AUTOCHECKPOINT]
|
|
|
+** pages. The use of this interface
|
|
|
+** is only necessary if the default setting is found to be suboptimal
|
|
|
+** for a particular application.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_wal_autocheckpoint(sqlite3 *db, int N);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Checkpoint a database
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^(The sqlite3_wal_checkpoint(D,X) is equivalent to
|
|
|
+** [sqlite3_wal_checkpoint_v2](D,X,[SQLITE_CHECKPOINT_PASSIVE],0,0).)^
|
|
|
+**
|
|
|
+** In brief, sqlite3_wal_checkpoint(D,X) causes the content in the
|
|
|
+** [write-ahead log] for database X on [database connection] D to be
|
|
|
+** transferred into the database file and for the write-ahead log to
|
|
|
+** be reset. See the [checkpointing] documentation for addition
|
|
|
+** information.
|
|
|
+**
|
|
|
+** This interface used to be the only way to cause a checkpoint to
|
|
|
+** occur. But then the newer and more powerful [sqlite3_wal_checkpoint_v2()]
|
|
|
+** interface was added. This interface is retained for backwards
|
|
|
+** compatibility and as a convenience for applications that need to manually
|
|
|
+** start a callback but which do not need the full power (and corresponding
|
|
|
+** complication) of [sqlite3_wal_checkpoint_v2()].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_wal_checkpoint(sqlite3 *db, const char *zDb);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Checkpoint a database
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^(The sqlite3_wal_checkpoint_v2(D,X,M,L,C) interface runs a checkpoint
|
|
|
+** operation on database X of [database connection] D in mode M. Status
|
|
|
+** information is written back into integers pointed to by L and C.)^
|
|
|
+** ^(The M parameter must be a valid [checkpoint mode]:)^
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** <dt>SQLITE_CHECKPOINT_PASSIVE<dd>
|
|
|
+** ^Checkpoint as many frames as possible without waiting for any database
|
|
|
+** readers or writers to finish, then sync the database file if all frames
|
|
|
+** in the log were checkpointed. ^The [busy-handler callback]
|
|
|
+** is never invoked in the SQLITE_CHECKPOINT_PASSIVE mode.
|
|
|
+** ^On the other hand, passive mode might leave the checkpoint unfinished
|
|
|
+** if there are concurrent readers or writers.
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHECKPOINT_FULL<dd>
|
|
|
+** ^This mode blocks (it invokes the
|
|
|
+** [sqlite3_busy_handler|busy-handler callback]) until there is no
|
|
|
+** database writer and all readers are reading from the most recent database
|
|
|
+** snapshot. ^It then checkpoints all frames in the log file and syncs the
|
|
|
+** database file. ^This mode blocks new database writers while it is pending,
|
|
|
+** but new database readers are allowed to continue unimpeded.
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHECKPOINT_RESTART<dd>
|
|
|
+** ^This mode works the same way as SQLITE_CHECKPOINT_FULL with the addition
|
|
|
+** that after checkpointing the log file it blocks (calls the
|
|
|
+** [busy-handler callback])
|
|
|
+** until all readers are reading from the database file only. ^This ensures
|
|
|
+** that the next writer will restart the log file from the beginning.
|
|
|
+** ^Like SQLITE_CHECKPOINT_FULL, this mode blocks new
|
|
|
+** database writer attempts while it is pending, but does not impede readers.
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHECKPOINT_TRUNCATE<dd>
|
|
|
+** ^This mode works the same way as SQLITE_CHECKPOINT_RESTART with the
|
|
|
+** addition that it also truncates the log file to zero bytes just prior
|
|
|
+** to a successful return.
|
|
|
+** </dl>
|
|
|
+**
|
|
|
+** ^If pnLog is not NULL, then *pnLog is set to the total number of frames in
|
|
|
+** the log file or to -1 if the checkpoint could not run because
|
|
|
+** of an error or because the database is not in [WAL mode]. ^If pnCkpt is not
|
|
|
+** NULL,then *pnCkpt is set to the total number of checkpointed frames in the
|
|
|
+** log file (including any that were already checkpointed before the function
|
|
|
+** was called) or to -1 if the checkpoint could not run due to an error or
|
|
|
+** because the database is not in WAL mode. ^Note that upon successful
|
|
|
+** completion of an SQLITE_CHECKPOINT_TRUNCATE, the log file will have been
|
|
|
+** truncated to zero bytes and so both *pnLog and *pnCkpt will be set to zero.
|
|
|
+**
|
|
|
+** ^All calls obtain an exclusive "checkpoint" lock on the database file. ^If
|
|
|
+** any other process is running a checkpoint operation at the same time, the
|
|
|
+** lock cannot be obtained and SQLITE_BUSY is returned. ^Even if there is a
|
|
|
+** busy-handler configured, it will not be invoked in this case.
|
|
|
+**
|
|
|
+** ^The SQLITE_CHECKPOINT_FULL, RESTART and TRUNCATE modes also obtain the
|
|
|
+** exclusive "writer" lock on the database file. ^If the writer lock cannot be
|
|
|
+** obtained immediately, and a busy-handler is configured, it is invoked and
|
|
|
+** the writer lock retried until either the busy-handler returns 0 or the lock
|
|
|
+** is successfully obtained. ^The busy-handler is also invoked while waiting for
|
|
|
+** database readers as described above. ^If the busy-handler returns 0 before
|
|
|
+** the writer lock is obtained or while waiting for database readers, the
|
|
|
+** checkpoint operation proceeds from that point in the same way as
|
|
|
+** SQLITE_CHECKPOINT_PASSIVE - checkpointing as many frames as possible
|
|
|
+** without blocking any further. ^SQLITE_BUSY is returned in this case.
|
|
|
+**
|
|
|
+** ^If parameter zDb is NULL or points to a zero length string, then the
|
|
|
+** specified operation is attempted on all WAL databases [attached] to
|
|
|
+** [database connection] db. In this case the
|
|
|
+** values written to output parameters *pnLog and *pnCkpt are undefined. ^If
|
|
|
+** an SQLITE_BUSY error is encountered when processing one or more of the
|
|
|
+** attached WAL databases, the operation is still attempted on any remaining
|
|
|
+** attached databases and SQLITE_BUSY is returned at the end. ^If any other
|
|
|
+** error occurs while processing an attached database, processing is abandoned
|
|
|
+** and the error code is returned to the caller immediately. ^If no error
|
|
|
+** (SQLITE_BUSY or otherwise) is encountered while processing the attached
|
|
|
+** databases, SQLITE_OK is returned.
|
|
|
+**
|
|
|
+** ^If database zDb is the name of an attached database that is not in WAL
|
|
|
+** mode, SQLITE_OK is returned and both *pnLog and *pnCkpt set to -1. ^If
|
|
|
+** zDb is not NULL (or a zero length string) and is not the name of any
|
|
|
+** attached database, SQLITE_ERROR is returned to the caller.
|
|
|
+**
|
|
|
+** ^Unless it returns SQLITE_MISUSE,
|
|
|
+** the sqlite3_wal_checkpoint_v2() interface
|
|
|
+** sets the error information that is queried by
|
|
|
+** [sqlite3_errcode()] and [sqlite3_errmsg()].
|
|
|
+**
|
|
|
+** ^The [PRAGMA wal_checkpoint] command can be used to invoke this interface
|
|
|
+** from SQL.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_wal_checkpoint_v2(
|
|
|
+ sqlite3 *db, /* Database handle */
|
|
|
+ const char *zDb, /* Name of attached database (or NULL) */
|
|
|
+ int eMode, /* SQLITE_CHECKPOINT_* value */
|
|
|
+ int *pnLog, /* OUT: Size of WAL log in frames */
|
|
|
+ int *pnCkpt /* OUT: Total number of frames checkpointed */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Checkpoint Mode Values
|
|
|
+** KEYWORDS: {checkpoint mode}
|
|
|
+**
|
|
|
+** These constants define all valid values for the "checkpoint mode" passed
|
|
|
+** as the third parameter to the [sqlite3_wal_checkpoint_v2()] interface.
|
|
|
+** See the [sqlite3_wal_checkpoint_v2()] documentation for details on the
|
|
|
+** meaning of each of these checkpoint modes.
|
|
|
+*/
|
|
|
+#define SQLITE_CHECKPOINT_PASSIVE 0 /* Do as much as possible w/o blocking */
|
|
|
+#define SQLITE_CHECKPOINT_FULL 1 /* Wait for writers, then checkpoint */
|
|
|
+#define SQLITE_CHECKPOINT_RESTART 2 /* Like FULL but wait for for readers */
|
|
|
+#define SQLITE_CHECKPOINT_TRUNCATE 3 /* Like RESTART but also truncate WAL */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Virtual Table Interface Configuration
|
|
|
+**
|
|
|
+** This function may be called by either the [xConnect] or [xCreate] method
|
|
|
+** of a [virtual table] implementation to configure
|
|
|
+** various facets of the virtual table interface.
|
|
|
+**
|
|
|
+** If this interface is invoked outside the context of an xConnect or
|
|
|
+** xCreate virtual table method then the behavior is undefined.
|
|
|
+**
|
|
|
+** In the call sqlite3_vtab_config(D,C,...) the D parameter is the
|
|
|
+** [database connection] in which the virtual table is being created and
|
|
|
+** which is passed in as the first argument to the [xConnect] or [xCreate]
|
|
|
+** method that is invoking sqlite3_vtab_config(). The C parameter is one
|
|
|
+** of the [virtual table configuration options]. The presence and meaning
|
|
|
+** of parameters after C depend on which [virtual table configuration option]
|
|
|
+** is used.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_vtab_config(sqlite3*, int op, ...);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Virtual Table Configuration Options
|
|
|
+** KEYWORDS: {virtual table configuration options}
|
|
|
+** KEYWORDS: {virtual table configuration option}
|
|
|
+**
|
|
|
+** These macros define the various options to the
|
|
|
+** [sqlite3_vtab_config()] interface that [virtual table] implementations
|
|
|
+** can use to customize and optimize their behavior.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_VTAB_CONSTRAINT_SUPPORT]]
|
|
|
+** <dt>SQLITE_VTAB_CONSTRAINT_SUPPORT</dt>
|
|
|
+** <dd>Calls of the form
|
|
|
+** [sqlite3_vtab_config](db,SQLITE_VTAB_CONSTRAINT_SUPPORT,X) are supported,
|
|
|
+** where X is an integer. If X is zero, then the [virtual table] whose
|
|
|
+** [xCreate] or [xConnect] method invoked [sqlite3_vtab_config()] does not
|
|
|
+** support constraints. In this configuration (which is the default) if
|
|
|
+** a call to the [xUpdate] method returns [SQLITE_CONSTRAINT], then the entire
|
|
|
+** statement is rolled back as if [ON CONFLICT | OR ABORT] had been
|
|
|
+** specified as part of the users SQL statement, regardless of the actual
|
|
|
+** ON CONFLICT mode specified.
|
|
|
+**
|
|
|
+** If X is non-zero, then the virtual table implementation guarantees
|
|
|
+** that if [xUpdate] returns [SQLITE_CONSTRAINT], it will do so before
|
|
|
+** any modifications to internal or persistent data structures have been made.
|
|
|
+** If the [ON CONFLICT] mode is ABORT, FAIL, IGNORE or ROLLBACK, SQLite
|
|
|
+** is able to roll back a statement or database transaction, and abandon
|
|
|
+** or continue processing the current SQL statement as appropriate.
|
|
|
+** If the ON CONFLICT mode is REPLACE and the [xUpdate] method returns
|
|
|
+** [SQLITE_CONSTRAINT], SQLite handles this as if the ON CONFLICT mode
|
|
|
+** had been ABORT.
|
|
|
+**
|
|
|
+** Virtual table implementations that are required to handle OR REPLACE
|
|
|
+** must do so within the [xUpdate] method. If a call to the
|
|
|
+** [sqlite3_vtab_on_conflict()] function indicates that the current ON
|
|
|
+** CONFLICT policy is REPLACE, the virtual table implementation should
|
|
|
+** silently replace the appropriate rows within the xUpdate callback and
|
|
|
+** return SQLITE_OK. Or, if this is not possible, it may return
|
|
|
+** SQLITE_CONSTRAINT, in which case SQLite falls back to OR ABORT
|
|
|
+** constraint handling.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_VTAB_DIRECTONLY]]<dt>SQLITE_VTAB_DIRECTONLY</dt>
|
|
|
+** <dd>Calls of the form
|
|
|
+** [sqlite3_vtab_config](db,SQLITE_VTAB_DIRECTONLY) from within the
|
|
|
+** the [xConnect] or [xCreate] methods of a [virtual table] implmentation
|
|
|
+** prohibits that virtual table from being used from within triggers and
|
|
|
+** views.
|
|
|
+** </dd>
|
|
|
+**
|
|
|
+** [[SQLITE_VTAB_INNOCUOUS]]<dt>SQLITE_VTAB_INNOCUOUS</dt>
|
|
|
+** <dd>Calls of the form
|
|
|
+** [sqlite3_vtab_config](db,SQLITE_VTAB_INNOCUOUS) from within the
|
|
|
+** the [xConnect] or [xCreate] methods of a [virtual table] implmentation
|
|
|
+** identify that virtual table as being safe to use from within triggers
|
|
|
+** and views. Conceptually, the SQLITE_VTAB_INNOCUOUS tag means that the
|
|
|
+** virtual table can do no serious harm even if it is controlled by a
|
|
|
+** malicious hacker. Developers should avoid setting the SQLITE_VTAB_INNOCUOUS
|
|
|
+** flag unless absolutely necessary.
|
|
|
+** </dd>
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_VTAB_CONSTRAINT_SUPPORT 1
|
|
|
+#define SQLITE_VTAB_INNOCUOUS 2
|
|
|
+#define SQLITE_VTAB_DIRECTONLY 3
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Determine The Virtual Table Conflict Policy
|
|
|
+**
|
|
|
+** This function may only be called from within a call to the [xUpdate] method
|
|
|
+** of a [virtual table] implementation for an INSERT or UPDATE operation. ^The
|
|
|
+** value returned is one of [SQLITE_ROLLBACK], [SQLITE_IGNORE], [SQLITE_FAIL],
|
|
|
+** [SQLITE_ABORT], or [SQLITE_REPLACE], according to the [ON CONFLICT] mode
|
|
|
+** of the SQL statement that triggered the call to the [xUpdate] method of the
|
|
|
+** [virtual table].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_vtab_on_conflict(sqlite3 *);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Determine If Virtual Table Column Access Is For UPDATE
|
|
|
+**
|
|
|
+** If the sqlite3_vtab_nochange(X) routine is called within the [xColumn]
|
|
|
+** method of a [virtual table], then it might return true if the
|
|
|
+** column is being fetched as part of an UPDATE operation during which the
|
|
|
+** column value will not change. The virtual table implementation can use
|
|
|
+** this hint as permission to substitute a return value that is less
|
|
|
+** expensive to compute and that the corresponding
|
|
|
+** [xUpdate] method understands as a "no-change" value.
|
|
|
+**
|
|
|
+** If the [xColumn] method calls sqlite3_vtab_nochange() and finds that
|
|
|
+** the column is not changed by the UPDATE statement, then the xColumn
|
|
|
+** method can optionally return without setting a result, without calling
|
|
|
+** any of the [sqlite3_result_int|sqlite3_result_xxxxx() interfaces].
|
|
|
+** In that case, [sqlite3_value_nochange(X)] will return true for the
|
|
|
+** same column in the [xUpdate] method.
|
|
|
+**
|
|
|
+** The sqlite3_vtab_nochange() routine is an optimization. Virtual table
|
|
|
+** implementations should continue to give a correct answer even if the
|
|
|
+** sqlite3_vtab_nochange() interface were to always return false. In the
|
|
|
+** current implementation, the sqlite3_vtab_nochange() interface does always
|
|
|
+** returns false for the enhanced [UPDATE FROM] statement.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_vtab_nochange(sqlite3_context*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Determine The Collation For a Virtual Table Constraint
|
|
|
+** METHOD: sqlite3_index_info
|
|
|
+**
|
|
|
+** This function may only be called from within a call to the [xBestIndex]
|
|
|
+** method of a [virtual table]. This function returns a pointer to a string
|
|
|
+** that is the name of the appropriate collation sequence to use for text
|
|
|
+** comparisons on the constraint identified by its arguments.
|
|
|
+**
|
|
|
+** The first argument must be the pointer to the [sqlite3_index_info] object
|
|
|
+** that is the first parameter to the xBestIndex() method. The second argument
|
|
|
+** must be an index into the aConstraint[] array belonging to the
|
|
|
+** sqlite3_index_info structure passed to xBestIndex.
|
|
|
+**
|
|
|
+** Important:
|
|
|
+** The first parameter must be the same pointer that is passed into the
|
|
|
+** xBestMethod() method. The first parameter may not be a pointer to a
|
|
|
+** different [sqlite3_index_info] object, even an exact copy.
|
|
|
+**
|
|
|
+** The return value is computed as follows:
|
|
|
+**
|
|
|
+** <ol>
|
|
|
+** <li><p> If the constraint comes from a WHERE clause expression that contains
|
|
|
+** a [COLLATE operator], then the name of the collation specified by
|
|
|
+** that COLLATE operator is returned.
|
|
|
+** <li><p> If there is no COLLATE operator, but the column that is the subject
|
|
|
+** of the constraint specifies an alternative collating sequence via
|
|
|
+** a [COLLATE clause] on the column definition within the CREATE TABLE
|
|
|
+** statement that was passed into [sqlite3_declare_vtab()], then the
|
|
|
+** name of that alternative collating sequence is returned.
|
|
|
+** <li><p> Otherwise, "BINARY" is returned.
|
|
|
+** </ol>
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_EXPERIMENTAL const char *sqlite3_vtab_collation(sqlite3_index_info*,int);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Determine if a virtual table query is DISTINCT
|
|
|
+** METHOD: sqlite3_index_info
|
|
|
+**
|
|
|
+** This API may only be used from within an [xBestIndex|xBestIndex method]
|
|
|
+** of a [virtual table] implementation. The result of calling this
|
|
|
+** interface from outside of xBestIndex() is undefined and probably harmful.
|
|
|
+**
|
|
|
+** ^The sqlite3_vtab_distinct() interface returns an integer that is
|
|
|
+** either 0, 1, or 2. The integer returned by sqlite3_vtab_distinct()
|
|
|
+** gives the virtual table additional information about how the query
|
|
|
+** planner wants the output to be ordered. As long as the virtual table
|
|
|
+** can meet the ordering requirements of the query planner, it may set
|
|
|
+** the "orderByConsumed" flag.
|
|
|
+**
|
|
|
+** <ol><li value="0"><p>
|
|
|
+** ^If the sqlite3_vtab_distinct() interface returns 0, that means
|
|
|
+** that the query planner needs the virtual table to return all rows in the
|
|
|
+** sort order defined by the "nOrderBy" and "aOrderBy" fields of the
|
|
|
+** [sqlite3_index_info] object. This is the default expectation. If the
|
|
|
+** virtual table outputs all rows in sorted order, then it is always safe for
|
|
|
+** the xBestIndex method to set the "orderByConsumed" flag, regardless of
|
|
|
+** the return value from sqlite3_vtab_distinct().
|
|
|
+** <li value="1"><p>
|
|
|
+** ^(If the sqlite3_vtab_distinct() interface returns 1, that means
|
|
|
+** that the query planner does not need the rows to be returned in sorted order
|
|
|
+** as long as all rows with the same values in all columns identified by the
|
|
|
+** "aOrderBy" field are adjacent.)^ This mode is used when the query planner
|
|
|
+** is doing a GROUP BY.
|
|
|
+** <li value="2"><p>
|
|
|
+** ^(If the sqlite3_vtab_distinct() interface returns 2, that means
|
|
|
+** that the query planner does not need the rows returned in any particular
|
|
|
+** order, as long as rows with the same values in all "aOrderBy" columns
|
|
|
+** are adjacent.)^ ^(Furthermore, only a single row for each particular
|
|
|
+** combination of values in the columns identified by the "aOrderBy" field
|
|
|
+** needs to be returned.)^ ^It is always ok for two or more rows with the same
|
|
|
+** values in all "aOrderBy" columns to be returned, as long as all such rows
|
|
|
+** are adjacent. ^The virtual table may, if it chooses, omit extra rows
|
|
|
+** that have the same value for all columns identified by "aOrderBy".
|
|
|
+** ^However omitting the extra rows is optional.
|
|
|
+** This mode is used for a DISTINCT query.
|
|
|
+** </ol>
|
|
|
+**
|
|
|
+** ^For the purposes of comparing virtual table output values to see if the
|
|
|
+** values are same value for sorting purposes, two NULL values are considered
|
|
|
+** to be the same. In other words, the comparison operator is "IS"
|
|
|
+** (or "IS NOT DISTINCT FROM") and not "==".
|
|
|
+**
|
|
|
+** If a virtual table implementation is unable to meet the requirements
|
|
|
+** specified above, then it must not set the "orderByConsumed" flag in the
|
|
|
+** [sqlite3_index_info] object or an incorrect answer may result.
|
|
|
+**
|
|
|
+** ^A virtual table implementation is always free to return rows in any order
|
|
|
+** it wants, as long as the "orderByConsumed" flag is not set. ^When the
|
|
|
+** the "orderByConsumed" flag is unset, the query planner will add extra
|
|
|
+** [bytecode] to ensure that the final results returned by the SQL query are
|
|
|
+** ordered correctly. The use of the "orderByConsumed" flag and the
|
|
|
+** sqlite3_vtab_distinct() interface is merely an optimization. ^Careful
|
|
|
+** use of the sqlite3_vtab_distinct() interface and the "orderByConsumed"
|
|
|
+** flag might help queries against a virtual table to run faster. Being
|
|
|
+** overly aggressive and setting the "orderByConsumed" flag when it is not
|
|
|
+** valid to do so, on the other hand, might cause SQLite to return incorrect
|
|
|
+** results.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_vtab_distinct(sqlite3_index_info*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Identify and handle IN constraints in xBestIndex
|
|
|
+**
|
|
|
+** This interface may only be used from within an
|
|
|
+** [xBestIndex|xBestIndex() method] of a [virtual table] implementation.
|
|
|
+** The result of invoking this interface from any other context is
|
|
|
+** undefined and probably harmful.
|
|
|
+**
|
|
|
+** ^(A constraint on a virtual table of the form
|
|
|
+** "[IN operator|column IN (...)]" is
|
|
|
+** communicated to the xBestIndex method as a
|
|
|
+** [SQLITE_INDEX_CONSTRAINT_EQ] constraint.)^ If xBestIndex wants to use
|
|
|
+** this constraint, it must set the corresponding
|
|
|
+** aConstraintUsage[].argvIndex to a postive integer. ^(Then, under
|
|
|
+** the usual mode of handling IN operators, SQLite generates [bytecode]
|
|
|
+** that invokes the [xFilter|xFilter() method] once for each value
|
|
|
+** on the right-hand side of the IN operator.)^ Thus the virtual table
|
|
|
+** only sees a single value from the right-hand side of the IN operator
|
|
|
+** at a time.
|
|
|
+**
|
|
|
+** In some cases, however, it would be advantageous for the virtual
|
|
|
+** table to see all values on the right-hand of the IN operator all at
|
|
|
+** once. The sqlite3_vtab_in() interfaces facilitates this in two ways:
|
|
|
+**
|
|
|
+** <ol>
|
|
|
+** <li><p>
|
|
|
+** ^A call to sqlite3_vtab_in(P,N,-1) will return true (non-zero)
|
|
|
+** if and only if the [sqlite3_index_info|P->aConstraint][N] constraint
|
|
|
+** is an [IN operator] that can be processed all at once. ^In other words,
|
|
|
+** sqlite3_vtab_in() with -1 in the third argument is a mechanism
|
|
|
+** by which the virtual table can ask SQLite if all-at-once processing
|
|
|
+** of the IN operator is even possible.
|
|
|
+**
|
|
|
+** <li><p>
|
|
|
+** ^A call to sqlite3_vtab_in(P,N,F) with F==1 or F==0 indicates
|
|
|
+** to SQLite that the virtual table does or does not want to process
|
|
|
+** the IN operator all-at-once, respectively. ^Thus when the third
|
|
|
+** parameter (F) is non-negative, this interface is the mechanism by
|
|
|
+** which the virtual table tells SQLite how it wants to process the
|
|
|
+** IN operator.
|
|
|
+** </ol>
|
|
|
+**
|
|
|
+** ^The sqlite3_vtab_in(P,N,F) interface can be invoked multiple times
|
|
|
+** within the same xBestIndex method call. ^For any given P,N pair,
|
|
|
+** the return value from sqlite3_vtab_in(P,N,F) will always be the same
|
|
|
+** within the same xBestIndex call. ^If the interface returns true
|
|
|
+** (non-zero), that means that the constraint is an IN operator
|
|
|
+** that can be processed all-at-once. ^If the constraint is not an IN
|
|
|
+** operator or cannot be processed all-at-once, then the interface returns
|
|
|
+** false.
|
|
|
+**
|
|
|
+** ^(All-at-once processing of the IN operator is selected if both of the
|
|
|
+** following conditions are met:
|
|
|
+**
|
|
|
+** <ol>
|
|
|
+** <li><p> The P->aConstraintUsage[N].argvIndex value is set to a positive
|
|
|
+** integer. This is how the virtual table tells SQLite that it wants to
|
|
|
+** use the N-th constraint.
|
|
|
+**
|
|
|
+** <li><p> The last call to sqlite3_vtab_in(P,N,F) for which F was
|
|
|
+** non-negative had F>=1.
|
|
|
+** </ol>)^
|
|
|
+**
|
|
|
+** ^If either or both of the conditions above are false, then SQLite uses
|
|
|
+** the traditional one-at-a-time processing strategy for the IN constraint.
|
|
|
+** ^If both conditions are true, then the argvIndex-th parameter to the
|
|
|
+** xFilter method will be an [sqlite3_value] that appears to be NULL,
|
|
|
+** but which can be passed to [sqlite3_vtab_in_first()] and
|
|
|
+** [sqlite3_vtab_in_next()] to find all values on the right-hand side
|
|
|
+** of the IN constraint.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_vtab_in(sqlite3_index_info*, int iCons, int bHandle);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Find all elements on the right-hand side of an IN constraint.
|
|
|
+**
|
|
|
+** These interfaces are only useful from within the
|
|
|
+** [xFilter|xFilter() method] of a [virtual table] implementation.
|
|
|
+** The result of invoking these interfaces from any other context
|
|
|
+** is undefined and probably harmful.
|
|
|
+**
|
|
|
+** The X parameter in a call to sqlite3_vtab_in_first(X,P) or
|
|
|
+** sqlite3_vtab_in_next(X,P) must be one of the parameters to the
|
|
|
+** xFilter method which invokes these routines, and specifically
|
|
|
+** a parameter that was previously selected for all-at-once IN constraint
|
|
|
+** processing use the [sqlite3_vtab_in()] interface in the
|
|
|
+** [xBestIndex|xBestIndex method]. ^(If the X parameter is not
|
|
|
+** an xFilter argument that was selected for all-at-once IN constraint
|
|
|
+** processing, then these routines return [SQLITE_MISUSE])^ or perhaps
|
|
|
+** exhibit some other undefined or harmful behavior.
|
|
|
+**
|
|
|
+** ^(Use these routines to access all values on the right-hand side
|
|
|
+** of the IN constraint using code like the following:
|
|
|
+**
|
|
|
+** <blockquote><pre>
|
|
|
+** for(rc=sqlite3_vtab_in_first(pList, &pVal);
|
|
|
+** rc==SQLITE_OK && pVal
|
|
|
+** rc=sqlite3_vtab_in_next(pList, &pVal)
|
|
|
+** ){
|
|
|
+** // do something with pVal
|
|
|
+** }
|
|
|
+** if( rc!=SQLITE_OK ){
|
|
|
+** // an error has occurred
|
|
|
+** }
|
|
|
+** </pre></blockquote>)^
|
|
|
+**
|
|
|
+** ^On success, the sqlite3_vtab_in_first(X,P) and sqlite3_vtab_in_next(X,P)
|
|
|
+** routines return SQLITE_OK and set *P to point to the first or next value
|
|
|
+** on the RHS of the IN constraint. ^If there are no more values on the
|
|
|
+** right hand side of the IN constraint, then *P is set to NULL and these
|
|
|
+** routines return [SQLITE_DONE]. ^The return value might be
|
|
|
+** some other value, such as SQLITE_NOMEM, in the event of a malfunction.
|
|
|
+**
|
|
|
+** The *ppOut values returned by these routines are only valid until the
|
|
|
+** next call to either of these routines or until the end of the xFilter
|
|
|
+** method from which these routines were called. If the virtual table
|
|
|
+** implementation needs to retain the *ppOut values for longer, it must make
|
|
|
+** copies. The *ppOut values are [protected sqlite3_value|protected].
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_vtab_in_first(sqlite3_value *pVal, sqlite3_value **ppOut);
|
|
|
+SQLITE_API int sqlite3_vtab_in_next(sqlite3_value *pVal, sqlite3_value **ppOut);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Constraint values in xBestIndex()
|
|
|
+** METHOD: sqlite3_index_info
|
|
|
+**
|
|
|
+** This API may only be used from within the [xBestIndex|xBestIndex method]
|
|
|
+** of a [virtual table] implementation. The result of calling this interface
|
|
|
+** from outside of an xBestIndex method are undefined and probably harmful.
|
|
|
+**
|
|
|
+** ^When the sqlite3_vtab_rhs_value(P,J,V) interface is invoked from within
|
|
|
+** the [xBestIndex] method of a [virtual table] implementation, with P being
|
|
|
+** a copy of the [sqlite3_index_info] object pointer passed into xBestIndex and
|
|
|
+** J being a 0-based index into P->aConstraint[], then this routine
|
|
|
+** attempts to set *V to the value of the right-hand operand of
|
|
|
+** that constraint if the right-hand operand is known. ^If the
|
|
|
+** right-hand operand is not known, then *V is set to a NULL pointer.
|
|
|
+** ^The sqlite3_vtab_rhs_value(P,J,V) interface returns SQLITE_OK if
|
|
|
+** and only if *V is set to a value. ^The sqlite3_vtab_rhs_value(P,J,V)
|
|
|
+** inteface returns SQLITE_NOTFOUND if the right-hand side of the J-th
|
|
|
+** constraint is not available. ^The sqlite3_vtab_rhs_value() interface
|
|
|
+** can return an result code other than SQLITE_OK or SQLITE_NOTFOUND if
|
|
|
+** something goes wrong.
|
|
|
+**
|
|
|
+** The sqlite3_vtab_rhs_value() interface is usually only successful if
|
|
|
+** the right-hand operand of a constraint is a literal value in the original
|
|
|
+** SQL statement. If the right-hand operand is an expression or a reference
|
|
|
+** to some other column or a [host parameter], then sqlite3_vtab_rhs_value()
|
|
|
+** will probably return [SQLITE_NOTFOUND].
|
|
|
+**
|
|
|
+** ^(Some constraints, such as [SQLITE_INDEX_CONSTRAINT_ISNULL] and
|
|
|
+** [SQLITE_INDEX_CONSTRAINT_ISNOTNULL], have no right-hand operand. For such
|
|
|
+** constraints, sqlite3_vtab_rhs_value() always returns SQLITE_NOTFOUND.)^
|
|
|
+**
|
|
|
+** ^The [sqlite3_value] object returned in *V is a protected sqlite3_value
|
|
|
+** and remains valid for the duration of the xBestIndex method call.
|
|
|
+** ^When xBestIndex returns, the sqlite3_value object returned by
|
|
|
+** sqlite3_vtab_rhs_value() is automatically deallocated.
|
|
|
+**
|
|
|
+** The "_rhs_" in the name of this routine is an abbreviation for
|
|
|
+** "Right-Hand Side".
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_vtab_rhs_value(sqlite3_index_info*, int, sqlite3_value **ppVal);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Conflict resolution modes
|
|
|
+** KEYWORDS: {conflict resolution mode}
|
|
|
+**
|
|
|
+** These constants are returned by [sqlite3_vtab_on_conflict()] to
|
|
|
+** inform a [virtual table] implementation what the [ON CONFLICT] mode
|
|
|
+** is for the SQL statement being evaluated.
|
|
|
+**
|
|
|
+** Note that the [SQLITE_IGNORE] constant is also used as a potential
|
|
|
+** return value from the [sqlite3_set_authorizer()] callback and that
|
|
|
+** [SQLITE_ABORT] is also a [result code].
|
|
|
+*/
|
|
|
+#define SQLITE_ROLLBACK 1
|
|
|
+/* #define SQLITE_IGNORE 2 // Also used by sqlite3_authorizer() callback */
|
|
|
+#define SQLITE_FAIL 3
|
|
|
+/* #define SQLITE_ABORT 4 // Also an error code */
|
|
|
+#define SQLITE_REPLACE 5
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Prepared Statement Scan Status Opcodes
|
|
|
+** KEYWORDS: {scanstatus options}
|
|
|
+**
|
|
|
+** The following constants can be used for the T parameter to the
|
|
|
+** [sqlite3_stmt_scanstatus(S,X,T,V)] interface. Each constant designates a
|
|
|
+** different metric for sqlite3_stmt_scanstatus() to return.
|
|
|
+**
|
|
|
+** When the value returned to V is a string, space to hold that string is
|
|
|
+** managed by the prepared statement S and will be automatically freed when
|
|
|
+** S is finalized.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** [[SQLITE_SCANSTAT_NLOOP]] <dt>SQLITE_SCANSTAT_NLOOP</dt>
|
|
|
+** <dd>^The [sqlite3_int64] variable pointed to by the V parameter will be
|
|
|
+** set to the total number of times that the X-th loop has run.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_SCANSTAT_NVISIT]] <dt>SQLITE_SCANSTAT_NVISIT</dt>
|
|
|
+** <dd>^The [sqlite3_int64] variable pointed to by the V parameter will be set
|
|
|
+** to the total number of rows examined by all iterations of the X-th loop.</dd>
|
|
|
+**
|
|
|
+** [[SQLITE_SCANSTAT_EST]] <dt>SQLITE_SCANSTAT_EST</dt>
|
|
|
+** <dd>^The "double" variable pointed to by the V parameter will be set to the
|
|
|
+** query planner's estimate for the average number of rows output from each
|
|
|
+** iteration of the X-th loop. If the query planner's estimates was accurate,
|
|
|
+** then this value will approximate the quotient NVISIT/NLOOP and the
|
|
|
+** product of this value for all prior loops with the same SELECTID will
|
|
|
+** be the NLOOP value for the current loop.
|
|
|
+**
|
|
|
+** [[SQLITE_SCANSTAT_NAME]] <dt>SQLITE_SCANSTAT_NAME</dt>
|
|
|
+** <dd>^The "const char *" variable pointed to by the V parameter will be set
|
|
|
+** to a zero-terminated UTF-8 string containing the name of the index or table
|
|
|
+** used for the X-th loop.
|
|
|
+**
|
|
|
+** [[SQLITE_SCANSTAT_EXPLAIN]] <dt>SQLITE_SCANSTAT_EXPLAIN</dt>
|
|
|
+** <dd>^The "const char *" variable pointed to by the V parameter will be set
|
|
|
+** to a zero-terminated UTF-8 string containing the [EXPLAIN QUERY PLAN]
|
|
|
+** description for the X-th loop.
|
|
|
+**
|
|
|
+** [[SQLITE_SCANSTAT_SELECTID]] <dt>SQLITE_SCANSTAT_SELECT</dt>
|
|
|
+** <dd>^The "int" variable pointed to by the V parameter will be set to the
|
|
|
+** "select-id" for the X-th loop. The select-id identifies which query or
|
|
|
+** subquery the loop is part of. The main query has a select-id of zero.
|
|
|
+** The select-id is the same value as is output in the first column
|
|
|
+** of an [EXPLAIN QUERY PLAN] query.
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_SCANSTAT_NLOOP 0
|
|
|
+#define SQLITE_SCANSTAT_NVISIT 1
|
|
|
+#define SQLITE_SCANSTAT_EST 2
|
|
|
+#define SQLITE_SCANSTAT_NAME 3
|
|
|
+#define SQLITE_SCANSTAT_EXPLAIN 4
|
|
|
+#define SQLITE_SCANSTAT_SELECTID 5
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Prepared Statement Scan Status
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** This interface returns information about the predicted and measured
|
|
|
+** performance for pStmt. Advanced applications can use this
|
|
|
+** interface to compare the predicted and the measured performance and
|
|
|
+** issue warnings and/or rerun [ANALYZE] if discrepancies are found.
|
|
|
+**
|
|
|
+** Since this interface is expected to be rarely used, it is only
|
|
|
+** available if SQLite is compiled using the [SQLITE_ENABLE_STMT_SCANSTATUS]
|
|
|
+** compile-time option.
|
|
|
+**
|
|
|
+** The "iScanStatusOp" parameter determines which status information to return.
|
|
|
+** The "iScanStatusOp" must be one of the [scanstatus options] or the behavior
|
|
|
+** of this interface is undefined.
|
|
|
+** ^The requested measurement is written into a variable pointed to by
|
|
|
+** the "pOut" parameter.
|
|
|
+** Parameter "idx" identifies the specific loop to retrieve statistics for.
|
|
|
+** Loops are numbered starting from zero. ^If idx is out of range - less than
|
|
|
+** zero or greater than or equal to the total number of loops used to implement
|
|
|
+** the statement - a non-zero value is returned and the variable that pOut
|
|
|
+** points to is unchanged.
|
|
|
+**
|
|
|
+** ^Statistics might not be available for all loops in all statements. ^In cases
|
|
|
+** where there exist loops with no available statistics, this function behaves
|
|
|
+** as if the loop did not exist - it returns non-zero and leave the variable
|
|
|
+** that pOut points to unchanged.
|
|
|
+**
|
|
|
+** See also: [sqlite3_stmt_scanstatus_reset()]
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_stmt_scanstatus(
|
|
|
+ sqlite3_stmt *pStmt, /* Prepared statement for which info desired */
|
|
|
+ int idx, /* Index of loop to report on */
|
|
|
+ int iScanStatusOp, /* Information desired. SQLITE_SCANSTAT_* */
|
|
|
+ void *pOut /* Result written here */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Zero Scan-Status Counters
|
|
|
+** METHOD: sqlite3_stmt
|
|
|
+**
|
|
|
+** ^Zero all [sqlite3_stmt_scanstatus()] related event counters.
|
|
|
+**
|
|
|
+** This API is only available if the library is built with pre-processor
|
|
|
+** symbol [SQLITE_ENABLE_STMT_SCANSTATUS] defined.
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3_stmt_scanstatus_reset(sqlite3_stmt*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Flush caches to disk mid-transaction
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^If a write-transaction is open on [database connection] D when the
|
|
|
+** [sqlite3_db_cacheflush(D)] interface invoked, any dirty
|
|
|
+** pages in the pager-cache that are not currently in use are written out
|
|
|
+** to disk. A dirty page may be in use if a database cursor created by an
|
|
|
+** active SQL statement is reading from it, or if it is page 1 of a database
|
|
|
+** file (page 1 is always "in use"). ^The [sqlite3_db_cacheflush(D)]
|
|
|
+** interface flushes caches for all schemas - "main", "temp", and
|
|
|
+** any [attached] databases.
|
|
|
+**
|
|
|
+** ^If this function needs to obtain extra database locks before dirty pages
|
|
|
+** can be flushed to disk, it does so. ^If those locks cannot be obtained
|
|
|
+** immediately and there is a busy-handler callback configured, it is invoked
|
|
|
+** in the usual manner. ^If the required lock still cannot be obtained, then
|
|
|
+** the database is skipped and an attempt made to flush any dirty pages
|
|
|
+** belonging to the next (if any) database. ^If any databases are skipped
|
|
|
+** because locks cannot be obtained, but no other error occurs, this
|
|
|
+** function returns SQLITE_BUSY.
|
|
|
+**
|
|
|
+** ^If any other error occurs while flushing dirty pages to disk (for
|
|
|
+** example an IO error or out-of-memory condition), then processing is
|
|
|
+** abandoned and an SQLite [error code] is returned to the caller immediately.
|
|
|
+**
|
|
|
+** ^Otherwise, if no error occurs, [sqlite3_db_cacheflush()] returns SQLITE_OK.
|
|
|
+**
|
|
|
+** ^This function does not set the database handle error code or message
|
|
|
+** returned by the [sqlite3_errcode()] and [sqlite3_errmsg()] functions.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_db_cacheflush(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: The pre-update hook.
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^These interfaces are only available if SQLite is compiled using the
|
|
|
+** [SQLITE_ENABLE_PREUPDATE_HOOK] compile-time option.
|
|
|
+**
|
|
|
+** ^The [sqlite3_preupdate_hook()] interface registers a callback function
|
|
|
+** that is invoked prior to each [INSERT], [UPDATE], and [DELETE] operation
|
|
|
+** on a database table.
|
|
|
+** ^At most one preupdate hook may be registered at a time on a single
|
|
|
+** [database connection]; each call to [sqlite3_preupdate_hook()] overrides
|
|
|
+** the previous setting.
|
|
|
+** ^The preupdate hook is disabled by invoking [sqlite3_preupdate_hook()]
|
|
|
+** with a NULL pointer as the second parameter.
|
|
|
+** ^The third parameter to [sqlite3_preupdate_hook()] is passed through as
|
|
|
+** the first parameter to callbacks.
|
|
|
+**
|
|
|
+** ^The preupdate hook only fires for changes to real database tables; the
|
|
|
+** preupdate hook is not invoked for changes to [virtual tables] or to
|
|
|
+** system tables like sqlite_sequence or sqlite_stat1.
|
|
|
+**
|
|
|
+** ^The second parameter to the preupdate callback is a pointer to
|
|
|
+** the [database connection] that registered the preupdate hook.
|
|
|
+** ^The third parameter to the preupdate callback is one of the constants
|
|
|
+** [SQLITE_INSERT], [SQLITE_DELETE], or [SQLITE_UPDATE] to identify the
|
|
|
+** kind of update operation that is about to occur.
|
|
|
+** ^(The fourth parameter to the preupdate callback is the name of the
|
|
|
+** database within the database connection that is being modified. This
|
|
|
+** will be "main" for the main database or "temp" for TEMP tables or
|
|
|
+** the name given after the AS keyword in the [ATTACH] statement for attached
|
|
|
+** databases.)^
|
|
|
+** ^The fifth parameter to the preupdate callback is the name of the
|
|
|
+** table that is being modified.
|
|
|
+**
|
|
|
+** For an UPDATE or DELETE operation on a [rowid table], the sixth
|
|
|
+** parameter passed to the preupdate callback is the initial [rowid] of the
|
|
|
+** row being modified or deleted. For an INSERT operation on a rowid table,
|
|
|
+** or any operation on a WITHOUT ROWID table, the value of the sixth
|
|
|
+** parameter is undefined. For an INSERT or UPDATE on a rowid table the
|
|
|
+** seventh parameter is the final rowid value of the row being inserted
|
|
|
+** or updated. The value of the seventh parameter passed to the callback
|
|
|
+** function is not defined for operations on WITHOUT ROWID tables, or for
|
|
|
+** DELETE operations on rowid tables.
|
|
|
+**
|
|
|
+** The [sqlite3_preupdate_old()], [sqlite3_preupdate_new()],
|
|
|
+** [sqlite3_preupdate_count()], and [sqlite3_preupdate_depth()] interfaces
|
|
|
+** provide additional information about a preupdate event. These routines
|
|
|
+** may only be called from within a preupdate callback. Invoking any of
|
|
|
+** these routines from outside of a preupdate callback or with a
|
|
|
+** [database connection] pointer that is different from the one supplied
|
|
|
+** to the preupdate callback results in undefined and probably undesirable
|
|
|
+** behavior.
|
|
|
+**
|
|
|
+** ^The [sqlite3_preupdate_count(D)] interface returns the number of columns
|
|
|
+** in the row that is being inserted, updated, or deleted.
|
|
|
+**
|
|
|
+** ^The [sqlite3_preupdate_old(D,N,P)] interface writes into P a pointer to
|
|
|
+** a [protected sqlite3_value] that contains the value of the Nth column of
|
|
|
+** the table row before it is updated. The N parameter must be between 0
|
|
|
+** and one less than the number of columns or the behavior will be
|
|
|
+** undefined. This must only be used within SQLITE_UPDATE and SQLITE_DELETE
|
|
|
+** preupdate callbacks; if it is used by an SQLITE_INSERT callback then the
|
|
|
+** behavior is undefined. The [sqlite3_value] that P points to
|
|
|
+** will be destroyed when the preupdate callback returns.
|
|
|
+**
|
|
|
+** ^The [sqlite3_preupdate_new(D,N,P)] interface writes into P a pointer to
|
|
|
+** a [protected sqlite3_value] that contains the value of the Nth column of
|
|
|
+** the table row after it is updated. The N parameter must be between 0
|
|
|
+** and one less than the number of columns or the behavior will be
|
|
|
+** undefined. This must only be used within SQLITE_INSERT and SQLITE_UPDATE
|
|
|
+** preupdate callbacks; if it is used by an SQLITE_DELETE callback then the
|
|
|
+** behavior is undefined. The [sqlite3_value] that P points to
|
|
|
+** will be destroyed when the preupdate callback returns.
|
|
|
+**
|
|
|
+** ^The [sqlite3_preupdate_depth(D)] interface returns 0 if the preupdate
|
|
|
+** callback was invoked as a result of a direct insert, update, or delete
|
|
|
+** operation; or 1 for inserts, updates, or deletes invoked by top-level
|
|
|
+** triggers; or 2 for changes resulting from triggers called by top-level
|
|
|
+** triggers; and so forth.
|
|
|
+**
|
|
|
+** When the [sqlite3_blob_write()] API is used to update a blob column,
|
|
|
+** the pre-update hook is invoked with SQLITE_DELETE. This is because the
|
|
|
+** in this case the new values are not available. In this case, when a
|
|
|
+** callback made with op==SQLITE_DELETE is actuall a write using the
|
|
|
+** sqlite3_blob_write() API, the [sqlite3_preupdate_blobwrite()] returns
|
|
|
+** the index of the column being written. In other cases, where the
|
|
|
+** pre-update hook is being invoked for some other reason, including a
|
|
|
+** regular DELETE, sqlite3_preupdate_blobwrite() returns -1.
|
|
|
+**
|
|
|
+** See also: [sqlite3_update_hook()]
|
|
|
+*/
|
|
|
+#if defined(SQLITE_ENABLE_PREUPDATE_HOOK)
|
|
|
+SQLITE_API void *sqlite3_preupdate_hook(
|
|
|
+ sqlite3 *db,
|
|
|
+ void(*xPreUpdate)(
|
|
|
+ void *pCtx, /* Copy of third arg to preupdate_hook() */
|
|
|
+ sqlite3 *db, /* Database handle */
|
|
|
+ int op, /* SQLITE_UPDATE, DELETE or INSERT */
|
|
|
+ char const *zDb, /* Database name */
|
|
|
+ char const *zName, /* Table name */
|
|
|
+ sqlite3_int64 iKey1, /* Rowid of row about to be deleted/updated */
|
|
|
+ sqlite3_int64 iKey2 /* New rowid value (for a rowid UPDATE) */
|
|
|
+ ),
|
|
|
+ void*
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3_preupdate_old(sqlite3 *, int, sqlite3_value **);
|
|
|
+SQLITE_API int sqlite3_preupdate_count(sqlite3 *);
|
|
|
+SQLITE_API int sqlite3_preupdate_depth(sqlite3 *);
|
|
|
+SQLITE_API int sqlite3_preupdate_new(sqlite3 *, int, sqlite3_value **);
|
|
|
+SQLITE_API int sqlite3_preupdate_blobwrite(sqlite3 *);
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Low-level system error code
|
|
|
+** METHOD: sqlite3
|
|
|
+**
|
|
|
+** ^Attempt to return the underlying operating system error code or error
|
|
|
+** number that caused the most recent I/O error or failure to open a file.
|
|
|
+** The return value is OS-dependent. For example, on unix systems, after
|
|
|
+** [sqlite3_open_v2()] returns [SQLITE_CANTOPEN], this interface could be
|
|
|
+** called to get back the underlying "errno" that caused the problem, such
|
|
|
+** as ENOSPC, EAUTH, EISDIR, and so forth.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_system_errno(sqlite3*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Database Snapshot
|
|
|
+** KEYWORDS: {snapshot} {sqlite3_snapshot}
|
|
|
+**
|
|
|
+** An instance of the snapshot object records the state of a [WAL mode]
|
|
|
+** database for some specific point in history.
|
|
|
+**
|
|
|
+** In [WAL mode], multiple [database connections] that are open on the
|
|
|
+** same database file can each be reading a different historical version
|
|
|
+** of the database file. When a [database connection] begins a read
|
|
|
+** transaction, that connection sees an unchanging copy of the database
|
|
|
+** as it existed for the point in time when the transaction first started.
|
|
|
+** Subsequent changes to the database from other connections are not seen
|
|
|
+** by the reader until a new read transaction is started.
|
|
|
+**
|
|
|
+** The sqlite3_snapshot object records state information about an historical
|
|
|
+** version of the database file so that it is possible to later open a new read
|
|
|
+** transaction that sees that historical version of the database rather than
|
|
|
+** the most recent version.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_snapshot {
|
|
|
+ unsigned char hidden[48];
|
|
|
+} sqlite3_snapshot;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Record A Database Snapshot
|
|
|
+** CONSTRUCTOR: sqlite3_snapshot
|
|
|
+**
|
|
|
+** ^The [sqlite3_snapshot_get(D,S,P)] interface attempts to make a
|
|
|
+** new [sqlite3_snapshot] object that records the current state of
|
|
|
+** schema S in database connection D. ^On success, the
|
|
|
+** [sqlite3_snapshot_get(D,S,P)] interface writes a pointer to the newly
|
|
|
+** created [sqlite3_snapshot] object into *P and returns SQLITE_OK.
|
|
|
+** If there is not already a read-transaction open on schema S when
|
|
|
+** this function is called, one is opened automatically.
|
|
|
+**
|
|
|
+** The following must be true for this function to succeed. If any of
|
|
|
+** the following statements are false when sqlite3_snapshot_get() is
|
|
|
+** called, SQLITE_ERROR is returned. The final value of *P is undefined
|
|
|
+** in this case.
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> The database handle must not be in [autocommit mode].
|
|
|
+**
|
|
|
+** <li> Schema S of [database connection] D must be a [WAL mode] database.
|
|
|
+**
|
|
|
+** <li> There must not be a write transaction open on schema S of database
|
|
|
+** connection D.
|
|
|
+**
|
|
|
+** <li> One or more transactions must have been written to the current wal
|
|
|
+** file since it was created on disk (by any connection). This means
|
|
|
+** that a snapshot cannot be taken on a wal mode database with no wal
|
|
|
+** file immediately after it is first opened. At least one transaction
|
|
|
+** must be written to it first.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** This function may also return SQLITE_NOMEM. If it is called with the
|
|
|
+** database handle in autocommit mode but fails for some other reason,
|
|
|
+** whether or not a read transaction is opened on schema S is undefined.
|
|
|
+**
|
|
|
+** The [sqlite3_snapshot] object returned from a successful call to
|
|
|
+** [sqlite3_snapshot_get()] must be freed using [sqlite3_snapshot_free()]
|
|
|
+** to avoid a memory leak.
|
|
|
+**
|
|
|
+** The [sqlite3_snapshot_get()] interface is only available when the
|
|
|
+** [SQLITE_ENABLE_SNAPSHOT] compile-time option is used.
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_get(
|
|
|
+ sqlite3 *db,
|
|
|
+ const char *zSchema,
|
|
|
+ sqlite3_snapshot **ppSnapshot
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Start a read transaction on an historical snapshot
|
|
|
+** METHOD: sqlite3_snapshot
|
|
|
+**
|
|
|
+** ^The [sqlite3_snapshot_open(D,S,P)] interface either starts a new read
|
|
|
+** transaction or upgrades an existing one for schema S of
|
|
|
+** [database connection] D such that the read transaction refers to
|
|
|
+** historical [snapshot] P, rather than the most recent change to the
|
|
|
+** database. ^The [sqlite3_snapshot_open()] interface returns SQLITE_OK
|
|
|
+** on success or an appropriate [error code] if it fails.
|
|
|
+**
|
|
|
+** ^In order to succeed, the database connection must not be in
|
|
|
+** [autocommit mode] when [sqlite3_snapshot_open(D,S,P)] is called. If there
|
|
|
+** is already a read transaction open on schema S, then the database handle
|
|
|
+** must have no active statements (SELECT statements that have been passed
|
|
|
+** to sqlite3_step() but not sqlite3_reset() or sqlite3_finalize()).
|
|
|
+** SQLITE_ERROR is returned if either of these conditions is violated, or
|
|
|
+** if schema S does not exist, or if the snapshot object is invalid.
|
|
|
+**
|
|
|
+** ^A call to sqlite3_snapshot_open() will fail to open if the specified
|
|
|
+** snapshot has been overwritten by a [checkpoint]. In this case
|
|
|
+** SQLITE_ERROR_SNAPSHOT is returned.
|
|
|
+**
|
|
|
+** If there is already a read transaction open when this function is
|
|
|
+** invoked, then the same read transaction remains open (on the same
|
|
|
+** database snapshot) if SQLITE_ERROR, SQLITE_BUSY or SQLITE_ERROR_SNAPSHOT
|
|
|
+** is returned. If another error code - for example SQLITE_PROTOCOL or an
|
|
|
+** SQLITE_IOERR error code - is returned, then the final state of the
|
|
|
+** read transaction is undefined. If SQLITE_OK is returned, then the
|
|
|
+** read transaction is now open on database snapshot P.
|
|
|
+**
|
|
|
+** ^(A call to [sqlite3_snapshot_open(D,S,P)] will fail if the
|
|
|
+** database connection D does not know that the database file for
|
|
|
+** schema S is in [WAL mode]. A database connection might not know
|
|
|
+** that the database file is in [WAL mode] if there has been no prior
|
|
|
+** I/O on that database connection, or if the database entered [WAL mode]
|
|
|
+** after the most recent I/O on the database connection.)^
|
|
|
+** (Hint: Run "[PRAGMA application_id]" against a newly opened
|
|
|
+** database connection in order to make it ready to use snapshots.)
|
|
|
+**
|
|
|
+** The [sqlite3_snapshot_open()] interface is only available when the
|
|
|
+** [SQLITE_ENABLE_SNAPSHOT] compile-time option is used.
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_open(
|
|
|
+ sqlite3 *db,
|
|
|
+ const char *zSchema,
|
|
|
+ sqlite3_snapshot *pSnapshot
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Destroy a snapshot
|
|
|
+** DESTRUCTOR: sqlite3_snapshot
|
|
|
+**
|
|
|
+** ^The [sqlite3_snapshot_free(P)] interface destroys [sqlite3_snapshot] P.
|
|
|
+** The application must eventually free every [sqlite3_snapshot] object
|
|
|
+** using this routine to avoid a memory leak.
|
|
|
+**
|
|
|
+** The [sqlite3_snapshot_free()] interface is only available when the
|
|
|
+** [SQLITE_ENABLE_SNAPSHOT] compile-time option is used.
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_EXPERIMENTAL void sqlite3_snapshot_free(sqlite3_snapshot*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Compare the ages of two snapshot handles.
|
|
|
+** METHOD: sqlite3_snapshot
|
|
|
+**
|
|
|
+** The sqlite3_snapshot_cmp(P1, P2) interface is used to compare the ages
|
|
|
+** of two valid snapshot handles.
|
|
|
+**
|
|
|
+** If the two snapshot handles are not associated with the same database
|
|
|
+** file, the result of the comparison is undefined.
|
|
|
+**
|
|
|
+** Additionally, the result of the comparison is only valid if both of the
|
|
|
+** snapshot handles were obtained by calling sqlite3_snapshot_get() since the
|
|
|
+** last time the wal file was deleted. The wal file is deleted when the
|
|
|
+** database is changed back to rollback mode or when the number of database
|
|
|
+** clients drops to zero. If either snapshot handle was obtained before the
|
|
|
+** wal file was last deleted, the value returned by this function
|
|
|
+** is undefined.
|
|
|
+**
|
|
|
+** Otherwise, this API returns a negative value if P1 refers to an older
|
|
|
+** snapshot than P2, zero if the two handles refer to the same database
|
|
|
+** snapshot, and a positive value if P1 is a newer snapshot than P2.
|
|
|
+**
|
|
|
+** This interface is only available if SQLite is compiled with the
|
|
|
+** [SQLITE_ENABLE_SNAPSHOT] option.
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_cmp(
|
|
|
+ sqlite3_snapshot *p1,
|
|
|
+ sqlite3_snapshot *p2
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Recover snapshots from a wal file
|
|
|
+** METHOD: sqlite3_snapshot
|
|
|
+**
|
|
|
+** If a [WAL file] remains on disk after all database connections close
|
|
|
+** (either through the use of the [SQLITE_FCNTL_PERSIST_WAL] [file control]
|
|
|
+** or because the last process to have the database opened exited without
|
|
|
+** calling [sqlite3_close()]) and a new connection is subsequently opened
|
|
|
+** on that database and [WAL file], the [sqlite3_snapshot_open()] interface
|
|
|
+** will only be able to open the last transaction added to the WAL file
|
|
|
+** even though the WAL file contains other valid transactions.
|
|
|
+**
|
|
|
+** This function attempts to scan the WAL file associated with database zDb
|
|
|
+** of database handle db and make all valid snapshots available to
|
|
|
+** sqlite3_snapshot_open(). It is an error if there is already a read
|
|
|
+** transaction open on the database, or if the database is not a WAL mode
|
|
|
+** database.
|
|
|
+**
|
|
|
+** SQLITE_OK is returned if successful, or an SQLite error code otherwise.
|
|
|
+**
|
|
|
+** This interface is only available if SQLite is compiled with the
|
|
|
+** [SQLITE_ENABLE_SNAPSHOT] option.
|
|
|
+*/
|
|
|
+SQLITE_API SQLITE_EXPERIMENTAL int sqlite3_snapshot_recover(sqlite3 *db, const char *zDb);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Serialize a database
|
|
|
+**
|
|
|
+** The sqlite3_serialize(D,S,P,F) interface returns a pointer to memory
|
|
|
+** that is a serialization of the S database on [database connection] D.
|
|
|
+** If P is not a NULL pointer, then the size of the database in bytes
|
|
|
+** is written into *P.
|
|
|
+**
|
|
|
+** For an ordinary on-disk database file, the serialization is just a
|
|
|
+** copy of the disk file. For an in-memory database or a "TEMP" database,
|
|
|
+** the serialization is the same sequence of bytes which would be written
|
|
|
+** to disk if that database where backed up to disk.
|
|
|
+**
|
|
|
+** The usual case is that sqlite3_serialize() copies the serialization of
|
|
|
+** the database into memory obtained from [sqlite3_malloc64()] and returns
|
|
|
+** a pointer to that memory. The caller is responsible for freeing the
|
|
|
+** returned value to avoid a memory leak. However, if the F argument
|
|
|
+** contains the SQLITE_SERIALIZE_NOCOPY bit, then no memory allocations
|
|
|
+** are made, and the sqlite3_serialize() function will return a pointer
|
|
|
+** to the contiguous memory representation of the database that SQLite
|
|
|
+** is currently using for that database, or NULL if the no such contiguous
|
|
|
+** memory representation of the database exists. A contiguous memory
|
|
|
+** representation of the database will usually only exist if there has
|
|
|
+** been a prior call to [sqlite3_deserialize(D,S,...)] with the same
|
|
|
+** values of D and S.
|
|
|
+** The size of the database is written into *P even if the
|
|
|
+** SQLITE_SERIALIZE_NOCOPY bit is set but no contiguous copy
|
|
|
+** of the database exists.
|
|
|
+**
|
|
|
+** A call to sqlite3_serialize(D,S,P,F) might return NULL even if the
|
|
|
+** SQLITE_SERIALIZE_NOCOPY bit is omitted from argument F if a memory
|
|
|
+** allocation error occurs.
|
|
|
+**
|
|
|
+** This interface is omitted if SQLite is compiled with the
|
|
|
+** [SQLITE_OMIT_DESERIALIZE] option.
|
|
|
+*/
|
|
|
+SQLITE_API unsigned char *sqlite3_serialize(
|
|
|
+ sqlite3 *db, /* The database connection */
|
|
|
+ const char *zSchema, /* Which DB to serialize. ex: "main", "temp", ... */
|
|
|
+ sqlite3_int64 *piSize, /* Write size of the DB here, if not NULL */
|
|
|
+ unsigned int mFlags /* Zero or more SQLITE_SERIALIZE_* flags */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Flags for sqlite3_serialize
|
|
|
+**
|
|
|
+** Zero or more of the following constants can be OR-ed together for
|
|
|
+** the F argument to [sqlite3_serialize(D,S,P,F)].
|
|
|
+**
|
|
|
+** SQLITE_SERIALIZE_NOCOPY means that [sqlite3_serialize()] will return
|
|
|
+** a pointer to contiguous in-memory database that it is currently using,
|
|
|
+** without making a copy of the database. If SQLite is not currently using
|
|
|
+** a contiguous in-memory database, then this option causes
|
|
|
+** [sqlite3_serialize()] to return a NULL pointer. SQLite will only be
|
|
|
+** using a contiguous in-memory database if it has been initialized by a
|
|
|
+** prior call to [sqlite3_deserialize()].
|
|
|
+*/
|
|
|
+#define SQLITE_SERIALIZE_NOCOPY 0x001 /* Do no memory allocations */
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Deserialize a database
|
|
|
+**
|
|
|
+** The sqlite3_deserialize(D,S,P,N,M,F) interface causes the
|
|
|
+** [database connection] D to disconnect from database S and then
|
|
|
+** reopen S as an in-memory database based on the serialization contained
|
|
|
+** in P. The serialized database P is N bytes in size. M is the size of
|
|
|
+** the buffer P, which might be larger than N. If M is larger than N, and
|
|
|
+** the SQLITE_DESERIALIZE_READONLY bit is not set in F, then SQLite is
|
|
|
+** permitted to add content to the in-memory database as long as the total
|
|
|
+** size does not exceed M bytes.
|
|
|
+**
|
|
|
+** If the SQLITE_DESERIALIZE_FREEONCLOSE bit is set in F, then SQLite will
|
|
|
+** invoke sqlite3_free() on the serialization buffer when the database
|
|
|
+** connection closes. If the SQLITE_DESERIALIZE_RESIZEABLE bit is set, then
|
|
|
+** SQLite will try to increase the buffer size using sqlite3_realloc64()
|
|
|
+** if writes on the database cause it to grow larger than M bytes.
|
|
|
+**
|
|
|
+** The sqlite3_deserialize() interface will fail with SQLITE_BUSY if the
|
|
|
+** database is currently in a read transaction or is involved in a backup
|
|
|
+** operation.
|
|
|
+**
|
|
|
+** It is not possible to deserialized into the TEMP database. If the
|
|
|
+** S argument to sqlite3_deserialize(D,S,P,N,M,F) is "temp" then the
|
|
|
+** function returns SQLITE_ERROR.
|
|
|
+**
|
|
|
+** If sqlite3_deserialize(D,S,P,N,M,F) fails for any reason and if the
|
|
|
+** SQLITE_DESERIALIZE_FREEONCLOSE bit is set in argument F, then
|
|
|
+** [sqlite3_free()] is invoked on argument P prior to returning.
|
|
|
+**
|
|
|
+** This interface is omitted if SQLite is compiled with the
|
|
|
+** [SQLITE_OMIT_DESERIALIZE] option.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_deserialize(
|
|
|
+ sqlite3 *db, /* The database connection */
|
|
|
+ const char *zSchema, /* Which DB to reopen with the deserialization */
|
|
|
+ unsigned char *pData, /* The serialized database content */
|
|
|
+ sqlite3_int64 szDb, /* Number bytes in the deserialization */
|
|
|
+ sqlite3_int64 szBuf, /* Total size of buffer pData[] */
|
|
|
+ unsigned mFlags /* Zero or more SQLITE_DESERIALIZE_* flags */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Flags for sqlite3_deserialize()
|
|
|
+**
|
|
|
+** The following are allowed values for 6th argument (the F argument) to
|
|
|
+** the [sqlite3_deserialize(D,S,P,N,M,F)] interface.
|
|
|
+**
|
|
|
+** The SQLITE_DESERIALIZE_FREEONCLOSE means that the database serialization
|
|
|
+** in the P argument is held in memory obtained from [sqlite3_malloc64()]
|
|
|
+** and that SQLite should take ownership of this memory and automatically
|
|
|
+** free it when it has finished using it. Without this flag, the caller
|
|
|
+** is responsible for freeing any dynamically allocated memory.
|
|
|
+**
|
|
|
+** The SQLITE_DESERIALIZE_RESIZEABLE flag means that SQLite is allowed to
|
|
|
+** grow the size of the database using calls to [sqlite3_realloc64()]. This
|
|
|
+** flag should only be used if SQLITE_DESERIALIZE_FREEONCLOSE is also used.
|
|
|
+** Without this flag, the deserialized database cannot increase in size beyond
|
|
|
+** the number of bytes specified by the M parameter.
|
|
|
+**
|
|
|
+** The SQLITE_DESERIALIZE_READONLY flag means that the deserialized database
|
|
|
+** should be treated as read-only.
|
|
|
+*/
|
|
|
+#define SQLITE_DESERIALIZE_FREEONCLOSE 1 /* Call sqlite3_free() on close */
|
|
|
+#define SQLITE_DESERIALIZE_RESIZEABLE 2 /* Resize using sqlite3_realloc64() */
|
|
|
+#define SQLITE_DESERIALIZE_READONLY 4 /* Database is read-only */
|
|
|
+
|
|
|
+/*
|
|
|
+** Undo the hack that converts floating point types to integer for
|
|
|
+** builds on processors without floating point support.
|
|
|
+*/
|
|
|
+#ifdef SQLITE_OMIT_FLOATING_POINT
|
|
|
+# undef double
|
|
|
+#endif
|
|
|
+
|
|
|
+#ifdef __cplusplus
|
|
|
+} /* End of the 'extern "C"' block */
|
|
|
+#endif
|
|
|
+#endif /* SQLITE3_H */
|
|
|
+
|
|
|
+/******** Begin file sqlite3rtree.h *********/
|
|
|
+/*
|
|
|
+** 2010 August 30
|
|
|
+**
|
|
|
+** The author disclaims copyright to this source code. In place of
|
|
|
+** a legal notice, here is a blessing:
|
|
|
+**
|
|
|
+** May you do good and not evil.
|
|
|
+** May you find forgiveness for yourself and forgive others.
|
|
|
+** May you share freely, never taking more than you give.
|
|
|
+**
|
|
|
+*************************************************************************
|
|
|
+*/
|
|
|
+
|
|
|
+#ifndef _SQLITE3RTREE_H_
|
|
|
+#define _SQLITE3RTREE_H_
|
|
|
+
|
|
|
+
|
|
|
+#ifdef __cplusplus
|
|
|
+extern "C" {
|
|
|
+#endif
|
|
|
+
|
|
|
+typedef struct sqlite3_rtree_geometry sqlite3_rtree_geometry;
|
|
|
+typedef struct sqlite3_rtree_query_info sqlite3_rtree_query_info;
|
|
|
+
|
|
|
+/* The double-precision datatype used by RTree depends on the
|
|
|
+** SQLITE_RTREE_INT_ONLY compile-time option.
|
|
|
+*/
|
|
|
+#ifdef SQLITE_RTREE_INT_ONLY
|
|
|
+ typedef sqlite3_int64 sqlite3_rtree_dbl;
|
|
|
+#else
|
|
|
+ typedef double sqlite3_rtree_dbl;
|
|
|
+#endif
|
|
|
+
|
|
|
+/*
|
|
|
+** Register a geometry callback named zGeom that can be used as part of an
|
|
|
+** R-Tree geometry query as follows:
|
|
|
+**
|
|
|
+** SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zGeom(... params ...)
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_rtree_geometry_callback(
|
|
|
+ sqlite3 *db,
|
|
|
+ const char *zGeom,
|
|
|
+ int (*xGeom)(sqlite3_rtree_geometry*, int, sqlite3_rtree_dbl*,int*),
|
|
|
+ void *pContext
|
|
|
+);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** A pointer to a structure of the following type is passed as the first
|
|
|
+** argument to callbacks registered using rtree_geometry_callback().
|
|
|
+*/
|
|
|
+struct sqlite3_rtree_geometry {
|
|
|
+ void *pContext; /* Copy of pContext passed to s_r_g_c() */
|
|
|
+ int nParam; /* Size of array aParam[] */
|
|
|
+ sqlite3_rtree_dbl *aParam; /* Parameters passed to SQL geom function */
|
|
|
+ void *pUser; /* Callback implementation user data */
|
|
|
+ void (*xDelUser)(void *); /* Called by SQLite to clean up pUser */
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** Register a 2nd-generation geometry callback named zScore that can be
|
|
|
+** used as part of an R-Tree geometry query as follows:
|
|
|
+**
|
|
|
+** SELECT ... FROM <rtree> WHERE <rtree col> MATCH $zQueryFunc(... params ...)
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3_rtree_query_callback(
|
|
|
+ sqlite3 *db,
|
|
|
+ const char *zQueryFunc,
|
|
|
+ int (*xQueryFunc)(sqlite3_rtree_query_info*),
|
|
|
+ void *pContext,
|
|
|
+ void (*xDestructor)(void*)
|
|
|
+);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** A pointer to a structure of the following type is passed as the
|
|
|
+** argument to scored geometry callback registered using
|
|
|
+** sqlite3_rtree_query_callback().
|
|
|
+**
|
|
|
+** Note that the first 5 fields of this structure are identical to
|
|
|
+** sqlite3_rtree_geometry. This structure is a subclass of
|
|
|
+** sqlite3_rtree_geometry.
|
|
|
+*/
|
|
|
+struct sqlite3_rtree_query_info {
|
|
|
+ void *pContext; /* pContext from when function registered */
|
|
|
+ int nParam; /* Number of function parameters */
|
|
|
+ sqlite3_rtree_dbl *aParam; /* value of function parameters */
|
|
|
+ void *pUser; /* callback can use this, if desired */
|
|
|
+ void (*xDelUser)(void*); /* function to free pUser */
|
|
|
+ sqlite3_rtree_dbl *aCoord; /* Coordinates of node or entry to check */
|
|
|
+ unsigned int *anQueue; /* Number of pending entries in the queue */
|
|
|
+ int nCoord; /* Number of coordinates */
|
|
|
+ int iLevel; /* Level of current node or entry */
|
|
|
+ int mxLevel; /* The largest iLevel value in the tree */
|
|
|
+ sqlite3_int64 iRowid; /* Rowid for current entry */
|
|
|
+ sqlite3_rtree_dbl rParentScore; /* Score of parent node */
|
|
|
+ int eParentWithin; /* Visibility of parent node */
|
|
|
+ int eWithin; /* OUT: Visibility */
|
|
|
+ sqlite3_rtree_dbl rScore; /* OUT: Write the score here */
|
|
|
+ /* The following fields are only available in 3.8.11 and later */
|
|
|
+ sqlite3_value **apSqlParam; /* Original SQL values of parameters */
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** Allowed values for sqlite3_rtree_query.eWithin and .eParentWithin.
|
|
|
+*/
|
|
|
+#define NOT_WITHIN 0 /* Object completely outside of query region */
|
|
|
+#define PARTLY_WITHIN 1 /* Object partially overlaps query region */
|
|
|
+#define FULLY_WITHIN 2 /* Object fully contained within query region */
|
|
|
+
|
|
|
+
|
|
|
+#ifdef __cplusplus
|
|
|
+} /* end of the 'extern "C"' block */
|
|
|
+#endif
|
|
|
+
|
|
|
+#endif /* ifndef _SQLITE3RTREE_H_ */
|
|
|
+
|
|
|
+/******** End of sqlite3rtree.h *********/
|
|
|
+/******** Begin file sqlite3session.h *********/
|
|
|
+
|
|
|
+#if !defined(__SQLITESESSION_H_) && defined(SQLITE_ENABLE_SESSION)
|
|
|
+#define __SQLITESESSION_H_ 1
|
|
|
+
|
|
|
+/*
|
|
|
+** Make sure we can call this stuff from C++.
|
|
|
+*/
|
|
|
+#ifdef __cplusplus
|
|
|
+extern "C" {
|
|
|
+#endif
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Session Object Handle
|
|
|
+**
|
|
|
+** An instance of this object is a [session] that can be used to
|
|
|
+** record changes to a database.
|
|
|
+*/
|
|
|
+typedef struct sqlite3_session sqlite3_session;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Changeset Iterator Handle
|
|
|
+**
|
|
|
+** An instance of this object acts as a cursor for iterating
|
|
|
+** over the elements of a [changeset] or [patchset].
|
|
|
+*/
|
|
|
+typedef struct sqlite3_changeset_iter sqlite3_changeset_iter;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Create A New Session Object
|
|
|
+** CONSTRUCTOR: sqlite3_session
|
|
|
+**
|
|
|
+** Create a new session object attached to database handle db. If successful,
|
|
|
+** a pointer to the new object is written to *ppSession and SQLITE_OK is
|
|
|
+** returned. If an error occurs, *ppSession is set to NULL and an SQLite
|
|
|
+** error code (e.g. SQLITE_NOMEM) is returned.
|
|
|
+**
|
|
|
+** It is possible to create multiple session objects attached to a single
|
|
|
+** database handle.
|
|
|
+**
|
|
|
+** Session objects created using this function should be deleted using the
|
|
|
+** [sqlite3session_delete()] function before the database handle that they
|
|
|
+** are attached to is itself closed. If the database handle is closed before
|
|
|
+** the session object is deleted, then the results of calling any session
|
|
|
+** module function, including [sqlite3session_delete()] on the session object
|
|
|
+** are undefined.
|
|
|
+**
|
|
|
+** Because the session module uses the [sqlite3_preupdate_hook()] API, it
|
|
|
+** is not possible for an application to register a pre-update hook on a
|
|
|
+** database handle that has one or more session objects attached. Nor is
|
|
|
+** it possible to create a session object attached to a database handle for
|
|
|
+** which a pre-update hook is already defined. The results of attempting
|
|
|
+** either of these things are undefined.
|
|
|
+**
|
|
|
+** The session object will be used to create changesets for tables in
|
|
|
+** database zDb, where zDb is either "main", or "temp", or the name of an
|
|
|
+** attached database. It is not an error if database zDb is not attached
|
|
|
+** to the database when the session object is created.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3session_create(
|
|
|
+ sqlite3 *db, /* Database handle */
|
|
|
+ const char *zDb, /* Name of db (e.g. "main") */
|
|
|
+ sqlite3_session **ppSession /* OUT: New session object */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Delete A Session Object
|
|
|
+** DESTRUCTOR: sqlite3_session
|
|
|
+**
|
|
|
+** Delete a session object previously allocated using
|
|
|
+** [sqlite3session_create()]. Once a session object has been deleted, the
|
|
|
+** results of attempting to use pSession with any other session module
|
|
|
+** function are undefined.
|
|
|
+**
|
|
|
+** Session objects must be deleted before the database handle to which they
|
|
|
+** are attached is closed. Refer to the documentation for
|
|
|
+** [sqlite3session_create()] for details.
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3session_delete(sqlite3_session *pSession);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPIREF: Conigure a Session Object
|
|
|
+** METHOD: sqlite3_session
|
|
|
+**
|
|
|
+** This method is used to configure a session object after it has been
|
|
|
+** created. At present the only valid value for the second parameter is
|
|
|
+** [SQLITE_SESSION_OBJCONFIG_SIZE].
|
|
|
+**
|
|
|
+** Arguments for sqlite3session_object_config()
|
|
|
+**
|
|
|
+** The following values may passed as the the 4th parameter to
|
|
|
+** sqlite3session_object_config().
|
|
|
+**
|
|
|
+** <dt>SQLITE_SESSION_OBJCONFIG_SIZE <dd>
|
|
|
+** This option is used to set, clear or query the flag that enables
|
|
|
+** the [sqlite3session_changeset_size()] API. Because it imposes some
|
|
|
+** computational overhead, this API is disabled by default. Argument
|
|
|
+** pArg must point to a value of type (int). If the value is initially
|
|
|
+** 0, then the sqlite3session_changeset_size() API is disabled. If it
|
|
|
+** is greater than 0, then the same API is enabled. Or, if the initial
|
|
|
+** value is less than zero, no change is made. In all cases the (int)
|
|
|
+** variable is set to 1 if the sqlite3session_changeset_size() API is
|
|
|
+** enabled following the current call, or 0 otherwise.
|
|
|
+**
|
|
|
+** It is an error (SQLITE_MISUSE) to attempt to modify this setting after
|
|
|
+** the first table has been attached to the session object.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3session_object_config(sqlite3_session*, int op, void *pArg);
|
|
|
+
|
|
|
+/*
|
|
|
+*/
|
|
|
+#define SQLITE_SESSION_OBJCONFIG_SIZE 1
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Enable Or Disable A Session Object
|
|
|
+** METHOD: sqlite3_session
|
|
|
+**
|
|
|
+** Enable or disable the recording of changes by a session object. When
|
|
|
+** enabled, a session object records changes made to the database. When
|
|
|
+** disabled - it does not. A newly created session object is enabled.
|
|
|
+** Refer to the documentation for [sqlite3session_changeset()] for further
|
|
|
+** details regarding how enabling and disabling a session object affects
|
|
|
+** the eventual changesets.
|
|
|
+**
|
|
|
+** Passing zero to this function disables the session. Passing a value
|
|
|
+** greater than zero enables it. Passing a value less than zero is a
|
|
|
+** no-op, and may be used to query the current state of the session.
|
|
|
+**
|
|
|
+** The return value indicates the final state of the session object: 0 if
|
|
|
+** the session is disabled, or 1 if it is enabled.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3session_enable(sqlite3_session *pSession, int bEnable);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Set Or Clear the Indirect Change Flag
|
|
|
+** METHOD: sqlite3_session
|
|
|
+**
|
|
|
+** Each change recorded by a session object is marked as either direct or
|
|
|
+** indirect. A change is marked as indirect if either:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> The session object "indirect" flag is set when the change is
|
|
|
+** made, or
|
|
|
+** <li> The change is made by an SQL trigger or foreign key action
|
|
|
+** instead of directly as a result of a users SQL statement.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** If a single row is affected by more than one operation within a session,
|
|
|
+** then the change is considered indirect if all operations meet the criteria
|
|
|
+** for an indirect change above, or direct otherwise.
|
|
|
+**
|
|
|
+** This function is used to set, clear or query the session object indirect
|
|
|
+** flag. If the second argument passed to this function is zero, then the
|
|
|
+** indirect flag is cleared. If it is greater than zero, the indirect flag
|
|
|
+** is set. Passing a value less than zero does not modify the current value
|
|
|
+** of the indirect flag, and may be used to query the current state of the
|
|
|
+** indirect flag for the specified session object.
|
|
|
+**
|
|
|
+** The return value indicates the final state of the indirect flag: 0 if
|
|
|
+** it is clear, or 1 if it is set.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3session_indirect(sqlite3_session *pSession, int bIndirect);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Attach A Table To A Session Object
|
|
|
+** METHOD: sqlite3_session
|
|
|
+**
|
|
|
+** If argument zTab is not NULL, then it is the name of a table to attach
|
|
|
+** to the session object passed as the first argument. All subsequent changes
|
|
|
+** made to the table while the session object is enabled will be recorded. See
|
|
|
+** documentation for [sqlite3session_changeset()] for further details.
|
|
|
+**
|
|
|
+** Or, if argument zTab is NULL, then changes are recorded for all tables
|
|
|
+** in the database. If additional tables are added to the database (by
|
|
|
+** executing "CREATE TABLE" statements) after this call is made, changes for
|
|
|
+** the new tables are also recorded.
|
|
|
+**
|
|
|
+** Changes can only be recorded for tables that have a PRIMARY KEY explicitly
|
|
|
+** defined as part of their CREATE TABLE statement. It does not matter if the
|
|
|
+** PRIMARY KEY is an "INTEGER PRIMARY KEY" (rowid alias) or not. The PRIMARY
|
|
|
+** KEY may consist of a single column, or may be a composite key.
|
|
|
+**
|
|
|
+** It is not an error if the named table does not exist in the database. Nor
|
|
|
+** is it an error if the named table does not have a PRIMARY KEY. However,
|
|
|
+** no changes will be recorded in either of these scenarios.
|
|
|
+**
|
|
|
+** Changes are not recorded for individual rows that have NULL values stored
|
|
|
+** in one or more of their PRIMARY KEY columns.
|
|
|
+**
|
|
|
+** SQLITE_OK is returned if the call completes without error. Or, if an error
|
|
|
+** occurs, an SQLite error code (e.g. SQLITE_NOMEM) is returned.
|
|
|
+**
|
|
|
+** <h3>Special sqlite_stat1 Handling</h3>
|
|
|
+**
|
|
|
+** As of SQLite version 3.22.0, the "sqlite_stat1" table is an exception to
|
|
|
+** some of the rules above. In SQLite, the schema of sqlite_stat1 is:
|
|
|
+** <pre>
|
|
|
+** CREATE TABLE sqlite_stat1(tbl,idx,stat)
|
|
|
+** </pre>
|
|
|
+**
|
|
|
+** Even though sqlite_stat1 does not have a PRIMARY KEY, changes are
|
|
|
+** recorded for it as if the PRIMARY KEY is (tbl,idx). Additionally, changes
|
|
|
+** are recorded for rows for which (idx IS NULL) is true. However, for such
|
|
|
+** rows a zero-length blob (SQL value X'') is stored in the changeset or
|
|
|
+** patchset instead of a NULL value. This allows such changesets to be
|
|
|
+** manipulated by legacy implementations of sqlite3changeset_invert(),
|
|
|
+** concat() and similar.
|
|
|
+**
|
|
|
+** The sqlite3changeset_apply() function automatically converts the
|
|
|
+** zero-length blob back to a NULL value when updating the sqlite_stat1
|
|
|
+** table. However, if the application calls sqlite3changeset_new(),
|
|
|
+** sqlite3changeset_old() or sqlite3changeset_conflict on a changeset
|
|
|
+** iterator directly (including on a changeset iterator passed to a
|
|
|
+** conflict-handler callback) then the X'' value is returned. The application
|
|
|
+** must translate X'' to NULL itself if required.
|
|
|
+**
|
|
|
+** Legacy (older than 3.22.0) versions of the sessions module cannot capture
|
|
|
+** changes made to the sqlite_stat1 table. Legacy versions of the
|
|
|
+** sqlite3changeset_apply() function silently ignore any modifications to the
|
|
|
+** sqlite_stat1 table that are part of a changeset or patchset.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3session_attach(
|
|
|
+ sqlite3_session *pSession, /* Session object */
|
|
|
+ const char *zTab /* Table name */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Set a table filter on a Session Object.
|
|
|
+** METHOD: sqlite3_session
|
|
|
+**
|
|
|
+** The second argument (xFilter) is the "filter callback". For changes to rows
|
|
|
+** in tables that are not attached to the Session object, the filter is called
|
|
|
+** to determine whether changes to the table's rows should be tracked or not.
|
|
|
+** If xFilter returns 0, changes are not tracked. Note that once a table is
|
|
|
+** attached, xFilter will not be called again.
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3session_table_filter(
|
|
|
+ sqlite3_session *pSession, /* Session object */
|
|
|
+ int(*xFilter)(
|
|
|
+ void *pCtx, /* Copy of third arg to _filter_table() */
|
|
|
+ const char *zTab /* Table name */
|
|
|
+ ),
|
|
|
+ void *pCtx /* First argument passed to xFilter */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Generate A Changeset From A Session Object
|
|
|
+** METHOD: sqlite3_session
|
|
|
+**
|
|
|
+** Obtain a changeset containing changes to the tables attached to the
|
|
|
+** session object passed as the first argument. If successful,
|
|
|
+** set *ppChangeset to point to a buffer containing the changeset
|
|
|
+** and *pnChangeset to the size of the changeset in bytes before returning
|
|
|
+** SQLITE_OK. If an error occurs, set both *ppChangeset and *pnChangeset to
|
|
|
+** zero and return an SQLite error code.
|
|
|
+**
|
|
|
+** A changeset consists of zero or more INSERT, UPDATE and/or DELETE changes,
|
|
|
+** each representing a change to a single row of an attached table. An INSERT
|
|
|
+** change contains the values of each field of a new database row. A DELETE
|
|
|
+** contains the original values of each field of a deleted database row. An
|
|
|
+** UPDATE change contains the original values of each field of an updated
|
|
|
+** database row along with the updated values for each updated non-primary-key
|
|
|
+** column. It is not possible for an UPDATE change to represent a change that
|
|
|
+** modifies the values of primary key columns. If such a change is made, it
|
|
|
+** is represented in a changeset as a DELETE followed by an INSERT.
|
|
|
+**
|
|
|
+** Changes are not recorded for rows that have NULL values stored in one or
|
|
|
+** more of their PRIMARY KEY columns. If such a row is inserted or deleted,
|
|
|
+** no corresponding change is present in the changesets returned by this
|
|
|
+** function. If an existing row with one or more NULL values stored in
|
|
|
+** PRIMARY KEY columns is updated so that all PRIMARY KEY columns are non-NULL,
|
|
|
+** only an INSERT is appears in the changeset. Similarly, if an existing row
|
|
|
+** with non-NULL PRIMARY KEY values is updated so that one or more of its
|
|
|
+** PRIMARY KEY columns are set to NULL, the resulting changeset contains a
|
|
|
+** DELETE change only.
|
|
|
+**
|
|
|
+** The contents of a changeset may be traversed using an iterator created
|
|
|
+** using the [sqlite3changeset_start()] API. A changeset may be applied to
|
|
|
+** a database with a compatible schema using the [sqlite3changeset_apply()]
|
|
|
+** API.
|
|
|
+**
|
|
|
+** Within a changeset generated by this function, all changes related to a
|
|
|
+** single table are grouped together. In other words, when iterating through
|
|
|
+** a changeset or when applying a changeset to a database, all changes related
|
|
|
+** to a single table are processed before moving on to the next table. Tables
|
|
|
+** are sorted in the same order in which they were attached (or auto-attached)
|
|
|
+** to the sqlite3_session object. The order in which the changes related to
|
|
|
+** a single table are stored is undefined.
|
|
|
+**
|
|
|
+** Following a successful call to this function, it is the responsibility of
|
|
|
+** the caller to eventually free the buffer that *ppChangeset points to using
|
|
|
+** [sqlite3_free()].
|
|
|
+**
|
|
|
+** <h3>Changeset Generation</h3>
|
|
|
+**
|
|
|
+** Once a table has been attached to a session object, the session object
|
|
|
+** records the primary key values of all new rows inserted into the table.
|
|
|
+** It also records the original primary key and other column values of any
|
|
|
+** deleted or updated rows. For each unique primary key value, data is only
|
|
|
+** recorded once - the first time a row with said primary key is inserted,
|
|
|
+** updated or deleted in the lifetime of the session.
|
|
|
+**
|
|
|
+** There is one exception to the previous paragraph: when a row is inserted,
|
|
|
+** updated or deleted, if one or more of its primary key columns contain a
|
|
|
+** NULL value, no record of the change is made.
|
|
|
+**
|
|
|
+** The session object therefore accumulates two types of records - those
|
|
|
+** that consist of primary key values only (created when the user inserts
|
|
|
+** a new record) and those that consist of the primary key values and the
|
|
|
+** original values of other table columns (created when the users deletes
|
|
|
+** or updates a record).
|
|
|
+**
|
|
|
+** When this function is called, the requested changeset is created using
|
|
|
+** both the accumulated records and the current contents of the database
|
|
|
+** file. Specifically:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> For each record generated by an insert, the database is queried
|
|
|
+** for a row with a matching primary key. If one is found, an INSERT
|
|
|
+** change is added to the changeset. If no such row is found, no change
|
|
|
+** is added to the changeset.
|
|
|
+**
|
|
|
+** <li> For each record generated by an update or delete, the database is
|
|
|
+** queried for a row with a matching primary key. If such a row is
|
|
|
+** found and one or more of the non-primary key fields have been
|
|
|
+** modified from their original values, an UPDATE change is added to
|
|
|
+** the changeset. Or, if no such row is found in the table, a DELETE
|
|
|
+** change is added to the changeset. If there is a row with a matching
|
|
|
+** primary key in the database, but all fields contain their original
|
|
|
+** values, no change is added to the changeset.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** This means, amongst other things, that if a row is inserted and then later
|
|
|
+** deleted while a session object is active, neither the insert nor the delete
|
|
|
+** will be present in the changeset. Or if a row is deleted and then later a
|
|
|
+** row with the same primary key values inserted while a session object is
|
|
|
+** active, the resulting changeset will contain an UPDATE change instead of
|
|
|
+** a DELETE and an INSERT.
|
|
|
+**
|
|
|
+** When a session object is disabled (see the [sqlite3session_enable()] API),
|
|
|
+** it does not accumulate records when rows are inserted, updated or deleted.
|
|
|
+** This may appear to have some counter-intuitive effects if a single row
|
|
|
+** is written to more than once during a session. For example, if a row
|
|
|
+** is inserted while a session object is enabled, then later deleted while
|
|
|
+** the same session object is disabled, no INSERT record will appear in the
|
|
|
+** changeset, even though the delete took place while the session was disabled.
|
|
|
+** Or, if one field of a row is updated while a session is disabled, and
|
|
|
+** another field of the same row is updated while the session is enabled, the
|
|
|
+** resulting changeset will contain an UPDATE change that updates both fields.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3session_changeset(
|
|
|
+ sqlite3_session *pSession, /* Session object */
|
|
|
+ int *pnChangeset, /* OUT: Size of buffer at *ppChangeset */
|
|
|
+ void **ppChangeset /* OUT: Buffer containing changeset */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Return An Upper-limit For The Size Of The Changeset
|
|
|
+** METHOD: sqlite3_session
|
|
|
+**
|
|
|
+** By default, this function always returns 0. For it to return
|
|
|
+** a useful result, the sqlite3_session object must have been configured
|
|
|
+** to enable this API using sqlite3session_object_config() with the
|
|
|
+** SQLITE_SESSION_OBJCONFIG_SIZE verb.
|
|
|
+**
|
|
|
+** When enabled, this function returns an upper limit, in bytes, for the size
|
|
|
+** of the changeset that might be produced if sqlite3session_changeset() were
|
|
|
+** called. The final changeset size might be equal to or smaller than the
|
|
|
+** size in bytes returned by this function.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_int64 sqlite3session_changeset_size(sqlite3_session *pSession);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Load The Difference Between Tables Into A Session
|
|
|
+** METHOD: sqlite3_session
|
|
|
+**
|
|
|
+** If it is not already attached to the session object passed as the first
|
|
|
+** argument, this function attaches table zTbl in the same manner as the
|
|
|
+** [sqlite3session_attach()] function. If zTbl does not exist, or if it
|
|
|
+** does not have a primary key, this function is a no-op (but does not return
|
|
|
+** an error).
|
|
|
+**
|
|
|
+** Argument zFromDb must be the name of a database ("main", "temp" etc.)
|
|
|
+** attached to the same database handle as the session object that contains
|
|
|
+** a table compatible with the table attached to the session by this function.
|
|
|
+** A table is considered compatible if it:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> Has the same name,
|
|
|
+** <li> Has the same set of columns declared in the same order, and
|
|
|
+** <li> Has the same PRIMARY KEY definition.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** If the tables are not compatible, SQLITE_SCHEMA is returned. If the tables
|
|
|
+** are compatible but do not have any PRIMARY KEY columns, it is not an error
|
|
|
+** but no changes are added to the session object. As with other session
|
|
|
+** APIs, tables without PRIMARY KEYs are simply ignored.
|
|
|
+**
|
|
|
+** This function adds a set of changes to the session object that could be
|
|
|
+** used to update the table in database zFrom (call this the "from-table")
|
|
|
+** so that its content is the same as the table attached to the session
|
|
|
+** object (call this the "to-table"). Specifically:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> For each row (primary key) that exists in the to-table but not in
|
|
|
+** the from-table, an INSERT record is added to the session object.
|
|
|
+**
|
|
|
+** <li> For each row (primary key) that exists in the to-table but not in
|
|
|
+** the from-table, a DELETE record is added to the session object.
|
|
|
+**
|
|
|
+** <li> For each row (primary key) that exists in both tables, but features
|
|
|
+** different non-PK values in each, an UPDATE record is added to the
|
|
|
+** session.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** To clarify, if this function is called and then a changeset constructed
|
|
|
+** using [sqlite3session_changeset()], then after applying that changeset to
|
|
|
+** database zFrom the contents of the two compatible tables would be
|
|
|
+** identical.
|
|
|
+**
|
|
|
+** It an error if database zFrom does not exist or does not contain the
|
|
|
+** required compatible table.
|
|
|
+**
|
|
|
+** If the operation is successful, SQLITE_OK is returned. Otherwise, an SQLite
|
|
|
+** error code. In this case, if argument pzErrMsg is not NULL, *pzErrMsg
|
|
|
+** may be set to point to a buffer containing an English language error
|
|
|
+** message. It is the responsibility of the caller to free this buffer using
|
|
|
+** sqlite3_free().
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3session_diff(
|
|
|
+ sqlite3_session *pSession,
|
|
|
+ const char *zFromDb,
|
|
|
+ const char *zTbl,
|
|
|
+ char **pzErrMsg
|
|
|
+);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Generate A Patchset From A Session Object
|
|
|
+** METHOD: sqlite3_session
|
|
|
+**
|
|
|
+** The differences between a patchset and a changeset are that:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> DELETE records consist of the primary key fields only. The
|
|
|
+** original values of other fields are omitted.
|
|
|
+** <li> The original values of any modified fields are omitted from
|
|
|
+** UPDATE records.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** A patchset blob may be used with up to date versions of all
|
|
|
+** sqlite3changeset_xxx API functions except for sqlite3changeset_invert(),
|
|
|
+** which returns SQLITE_CORRUPT if it is passed a patchset. Similarly,
|
|
|
+** attempting to use a patchset blob with old versions of the
|
|
|
+** sqlite3changeset_xxx APIs also provokes an SQLITE_CORRUPT error.
|
|
|
+**
|
|
|
+** Because the non-primary key "old.*" fields are omitted, no
|
|
|
+** SQLITE_CHANGESET_DATA conflicts can be detected or reported if a patchset
|
|
|
+** is passed to the sqlite3changeset_apply() API. Other conflict types work
|
|
|
+** in the same way as for changesets.
|
|
|
+**
|
|
|
+** Changes within a patchset are ordered in the same way as for changesets
|
|
|
+** generated by the sqlite3session_changeset() function (i.e. all changes for
|
|
|
+** a single table are grouped together, tables appear in the order in which
|
|
|
+** they were attached to the session object).
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3session_patchset(
|
|
|
+ sqlite3_session *pSession, /* Session object */
|
|
|
+ int *pnPatchset, /* OUT: Size of buffer at *ppPatchset */
|
|
|
+ void **ppPatchset /* OUT: Buffer containing patchset */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Test if a changeset has recorded any changes.
|
|
|
+**
|
|
|
+** Return non-zero if no changes to attached tables have been recorded by
|
|
|
+** the session object passed as the first argument. Otherwise, if one or
|
|
|
+** more changes have been recorded, return zero.
|
|
|
+**
|
|
|
+** Even if this function returns zero, it is possible that calling
|
|
|
+** [sqlite3session_changeset()] on the session handle may still return a
|
|
|
+** changeset that contains no changes. This can happen when a row in
|
|
|
+** an attached table is modified and then later on the original values
|
|
|
+** are restored. However, if this function returns non-zero, then it is
|
|
|
+** guaranteed that a call to sqlite3session_changeset() will return a
|
|
|
+** changeset containing zero changes.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3session_isempty(sqlite3_session *pSession);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Query for the amount of heap memory used by a session object.
|
|
|
+**
|
|
|
+** This API returns the total amount of heap memory in bytes currently
|
|
|
+** used by the session object passed as the only argument.
|
|
|
+*/
|
|
|
+SQLITE_API sqlite3_int64 sqlite3session_memory_used(sqlite3_session *pSession);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Create An Iterator To Traverse A Changeset
|
|
|
+** CONSTRUCTOR: sqlite3_changeset_iter
|
|
|
+**
|
|
|
+** Create an iterator used to iterate through the contents of a changeset.
|
|
|
+** If successful, *pp is set to point to the iterator handle and SQLITE_OK
|
|
|
+** is returned. Otherwise, if an error occurs, *pp is set to zero and an
|
|
|
+** SQLite error code is returned.
|
|
|
+**
|
|
|
+** The following functions can be used to advance and query a changeset
|
|
|
+** iterator created by this function:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> [sqlite3changeset_next()]
|
|
|
+** <li> [sqlite3changeset_op()]
|
|
|
+** <li> [sqlite3changeset_new()]
|
|
|
+** <li> [sqlite3changeset_old()]
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** It is the responsibility of the caller to eventually destroy the iterator
|
|
|
+** by passing it to [sqlite3changeset_finalize()]. The buffer containing the
|
|
|
+** changeset (pChangeset) must remain valid until after the iterator is
|
|
|
+** destroyed.
|
|
|
+**
|
|
|
+** Assuming the changeset blob was created by one of the
|
|
|
+** [sqlite3session_changeset()], [sqlite3changeset_concat()] or
|
|
|
+** [sqlite3changeset_invert()] functions, all changes within the changeset
|
|
|
+** that apply to a single table are grouped together. This means that when
|
|
|
+** an application iterates through a changeset using an iterator created by
|
|
|
+** this function, all changes that relate to a single table are visited
|
|
|
+** consecutively. There is no chance that the iterator will visit a change
|
|
|
+** the applies to table X, then one for table Y, and then later on visit
|
|
|
+** another change for table X.
|
|
|
+**
|
|
|
+** The behavior of sqlite3changeset_start_v2() and its streaming equivalent
|
|
|
+** may be modified by passing a combination of
|
|
|
+** [SQLITE_CHANGESETSTART_INVERT | supported flags] as the 4th parameter.
|
|
|
+**
|
|
|
+** Note that the sqlite3changeset_start_v2() API is still <b>experimental</b>
|
|
|
+** and therefore subject to change.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_start(
|
|
|
+ sqlite3_changeset_iter **pp, /* OUT: New changeset iterator handle */
|
|
|
+ int nChangeset, /* Size of changeset blob in bytes */
|
|
|
+ void *pChangeset /* Pointer to blob containing changeset */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3changeset_start_v2(
|
|
|
+ sqlite3_changeset_iter **pp, /* OUT: New changeset iterator handle */
|
|
|
+ int nChangeset, /* Size of changeset blob in bytes */
|
|
|
+ void *pChangeset, /* Pointer to blob containing changeset */
|
|
|
+ int flags /* SESSION_CHANGESETSTART_* flags */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Flags for sqlite3changeset_start_v2
|
|
|
+**
|
|
|
+** The following flags may passed via the 4th parameter to
|
|
|
+** [sqlite3changeset_start_v2] and [sqlite3changeset_start_v2_strm]:
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHANGESETAPPLY_INVERT <dd>
|
|
|
+** Invert the changeset while iterating through it. This is equivalent to
|
|
|
+** inverting a changeset using sqlite3changeset_invert() before applying it.
|
|
|
+** It is an error to specify this flag with a patchset.
|
|
|
+*/
|
|
|
+#define SQLITE_CHANGESETSTART_INVERT 0x0002
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Advance A Changeset Iterator
|
|
|
+** METHOD: sqlite3_changeset_iter
|
|
|
+**
|
|
|
+** This function may only be used with iterators created by the function
|
|
|
+** [sqlite3changeset_start()]. If it is called on an iterator passed to
|
|
|
+** a conflict-handler callback by [sqlite3changeset_apply()], SQLITE_MISUSE
|
|
|
+** is returned and the call has no effect.
|
|
|
+**
|
|
|
+** Immediately after an iterator is created by sqlite3changeset_start(), it
|
|
|
+** does not point to any change in the changeset. Assuming the changeset
|
|
|
+** is not empty, the first call to this function advances the iterator to
|
|
|
+** point to the first change in the changeset. Each subsequent call advances
|
|
|
+** the iterator to point to the next change in the changeset (if any). If
|
|
|
+** no error occurs and the iterator points to a valid change after a call
|
|
|
+** to sqlite3changeset_next() has advanced it, SQLITE_ROW is returned.
|
|
|
+** Otherwise, if all changes in the changeset have already been visited,
|
|
|
+** SQLITE_DONE is returned.
|
|
|
+**
|
|
|
+** If an error occurs, an SQLite error code is returned. Possible error
|
|
|
+** codes include SQLITE_CORRUPT (if the changeset buffer is corrupt) or
|
|
|
+** SQLITE_NOMEM.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_next(sqlite3_changeset_iter *pIter);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Obtain The Current Operation From A Changeset Iterator
|
|
|
+** METHOD: sqlite3_changeset_iter
|
|
|
+**
|
|
|
+** The pIter argument passed to this function may either be an iterator
|
|
|
+** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
|
|
|
+** created by [sqlite3changeset_start()]. In the latter case, the most recent
|
|
|
+** call to [sqlite3changeset_next()] must have returned [SQLITE_ROW]. If this
|
|
|
+** is not the case, this function returns [SQLITE_MISUSE].
|
|
|
+**
|
|
|
+** Arguments pOp, pnCol and pzTab may not be NULL. Upon return, three
|
|
|
+** outputs are set through these pointers:
|
|
|
+**
|
|
|
+** *pOp is set to one of [SQLITE_INSERT], [SQLITE_DELETE] or [SQLITE_UPDATE],
|
|
|
+** depending on the type of change that the iterator currently points to;
|
|
|
+**
|
|
|
+** *pnCol is set to the number of columns in the table affected by the change; and
|
|
|
+**
|
|
|
+** *pzTab is set to point to a nul-terminated utf-8 encoded string containing
|
|
|
+** the name of the table affected by the current change. The buffer remains
|
|
|
+** valid until either sqlite3changeset_next() is called on the iterator
|
|
|
+** or until the conflict-handler function returns.
|
|
|
+**
|
|
|
+** If pbIndirect is not NULL, then *pbIndirect is set to true (1) if the change
|
|
|
+** is an indirect change, or false (0) otherwise. See the documentation for
|
|
|
+** [sqlite3session_indirect()] for a description of direct and indirect
|
|
|
+** changes.
|
|
|
+**
|
|
|
+** If no error occurs, SQLITE_OK is returned. If an error does occur, an
|
|
|
+** SQLite error code is returned. The values of the output variables may not
|
|
|
+** be trusted in this case.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_op(
|
|
|
+ sqlite3_changeset_iter *pIter, /* Iterator object */
|
|
|
+ const char **pzTab, /* OUT: Pointer to table name */
|
|
|
+ int *pnCol, /* OUT: Number of columns in table */
|
|
|
+ int *pOp, /* OUT: SQLITE_INSERT, DELETE or UPDATE */
|
|
|
+ int *pbIndirect /* OUT: True for an 'indirect' change */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Obtain The Primary Key Definition Of A Table
|
|
|
+** METHOD: sqlite3_changeset_iter
|
|
|
+**
|
|
|
+** For each modified table, a changeset includes the following:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> The number of columns in the table, and
|
|
|
+** <li> Which of those columns make up the tables PRIMARY KEY.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** This function is used to find which columns comprise the PRIMARY KEY of
|
|
|
+** the table modified by the change that iterator pIter currently points to.
|
|
|
+** If successful, *pabPK is set to point to an array of nCol entries, where
|
|
|
+** nCol is the number of columns in the table. Elements of *pabPK are set to
|
|
|
+** 0x01 if the corresponding column is part of the tables primary key, or
|
|
|
+** 0x00 if it is not.
|
|
|
+**
|
|
|
+** If argument pnCol is not NULL, then *pnCol is set to the number of columns
|
|
|
+** in the table.
|
|
|
+**
|
|
|
+** If this function is called when the iterator does not point to a valid
|
|
|
+** entry, SQLITE_MISUSE is returned and the output variables zeroed. Otherwise,
|
|
|
+** SQLITE_OK is returned and the output variables populated as described
|
|
|
+** above.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_pk(
|
|
|
+ sqlite3_changeset_iter *pIter, /* Iterator object */
|
|
|
+ unsigned char **pabPK, /* OUT: Array of boolean - true for PK cols */
|
|
|
+ int *pnCol /* OUT: Number of entries in output array */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Obtain old.* Values From A Changeset Iterator
|
|
|
+** METHOD: sqlite3_changeset_iter
|
|
|
+**
|
|
|
+** The pIter argument passed to this function may either be an iterator
|
|
|
+** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
|
|
|
+** created by [sqlite3changeset_start()]. In the latter case, the most recent
|
|
|
+** call to [sqlite3changeset_next()] must have returned SQLITE_ROW.
|
|
|
+** Furthermore, it may only be called if the type of change that the iterator
|
|
|
+** currently points to is either [SQLITE_DELETE] or [SQLITE_UPDATE]. Otherwise,
|
|
|
+** this function returns [SQLITE_MISUSE] and sets *ppValue to NULL.
|
|
|
+**
|
|
|
+** Argument iVal must be greater than or equal to 0, and less than the number
|
|
|
+** of columns in the table affected by the current change. Otherwise,
|
|
|
+** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
|
|
|
+**
|
|
|
+** If successful, this function sets *ppValue to point to a protected
|
|
|
+** sqlite3_value object containing the iVal'th value from the vector of
|
|
|
+** original row values stored as part of the UPDATE or DELETE change and
|
|
|
+** returns SQLITE_OK. The name of the function comes from the fact that this
|
|
|
+** is similar to the "old.*" columns available to update or delete triggers.
|
|
|
+**
|
|
|
+** If some other error occurs (e.g. an OOM condition), an SQLite error code
|
|
|
+** is returned and *ppValue is set to NULL.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_old(
|
|
|
+ sqlite3_changeset_iter *pIter, /* Changeset iterator */
|
|
|
+ int iVal, /* Column number */
|
|
|
+ sqlite3_value **ppValue /* OUT: Old value (or NULL pointer) */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Obtain new.* Values From A Changeset Iterator
|
|
|
+** METHOD: sqlite3_changeset_iter
|
|
|
+**
|
|
|
+** The pIter argument passed to this function may either be an iterator
|
|
|
+** passed to a conflict-handler by [sqlite3changeset_apply()], or an iterator
|
|
|
+** created by [sqlite3changeset_start()]. In the latter case, the most recent
|
|
|
+** call to [sqlite3changeset_next()] must have returned SQLITE_ROW.
|
|
|
+** Furthermore, it may only be called if the type of change that the iterator
|
|
|
+** currently points to is either [SQLITE_UPDATE] or [SQLITE_INSERT]. Otherwise,
|
|
|
+** this function returns [SQLITE_MISUSE] and sets *ppValue to NULL.
|
|
|
+**
|
|
|
+** Argument iVal must be greater than or equal to 0, and less than the number
|
|
|
+** of columns in the table affected by the current change. Otherwise,
|
|
|
+** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
|
|
|
+**
|
|
|
+** If successful, this function sets *ppValue to point to a protected
|
|
|
+** sqlite3_value object containing the iVal'th value from the vector of
|
|
|
+** new row values stored as part of the UPDATE or INSERT change and
|
|
|
+** returns SQLITE_OK. If the change is an UPDATE and does not include
|
|
|
+** a new value for the requested column, *ppValue is set to NULL and
|
|
|
+** SQLITE_OK returned. The name of the function comes from the fact that
|
|
|
+** this is similar to the "new.*" columns available to update or delete
|
|
|
+** triggers.
|
|
|
+**
|
|
|
+** If some other error occurs (e.g. an OOM condition), an SQLite error code
|
|
|
+** is returned and *ppValue is set to NULL.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_new(
|
|
|
+ sqlite3_changeset_iter *pIter, /* Changeset iterator */
|
|
|
+ int iVal, /* Column number */
|
|
|
+ sqlite3_value **ppValue /* OUT: New value (or NULL pointer) */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Obtain Conflicting Row Values From A Changeset Iterator
|
|
|
+** METHOD: sqlite3_changeset_iter
|
|
|
+**
|
|
|
+** This function should only be used with iterator objects passed to a
|
|
|
+** conflict-handler callback by [sqlite3changeset_apply()] with either
|
|
|
+** [SQLITE_CHANGESET_DATA] or [SQLITE_CHANGESET_CONFLICT]. If this function
|
|
|
+** is called on any other iterator, [SQLITE_MISUSE] is returned and *ppValue
|
|
|
+** is set to NULL.
|
|
|
+**
|
|
|
+** Argument iVal must be greater than or equal to 0, and less than the number
|
|
|
+** of columns in the table affected by the current change. Otherwise,
|
|
|
+** [SQLITE_RANGE] is returned and *ppValue is set to NULL.
|
|
|
+**
|
|
|
+** If successful, this function sets *ppValue to point to a protected
|
|
|
+** sqlite3_value object containing the iVal'th value from the
|
|
|
+** "conflicting row" associated with the current conflict-handler callback
|
|
|
+** and returns SQLITE_OK.
|
|
|
+**
|
|
|
+** If some other error occurs (e.g. an OOM condition), an SQLite error code
|
|
|
+** is returned and *ppValue is set to NULL.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_conflict(
|
|
|
+ sqlite3_changeset_iter *pIter, /* Changeset iterator */
|
|
|
+ int iVal, /* Column number */
|
|
|
+ sqlite3_value **ppValue /* OUT: Value from conflicting row */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Determine The Number Of Foreign Key Constraint Violations
|
|
|
+** METHOD: sqlite3_changeset_iter
|
|
|
+**
|
|
|
+** This function may only be called with an iterator passed to an
|
|
|
+** SQLITE_CHANGESET_FOREIGN_KEY conflict handler callback. In this case
|
|
|
+** it sets the output variable to the total number of known foreign key
|
|
|
+** violations in the destination database and returns SQLITE_OK.
|
|
|
+**
|
|
|
+** In all other cases this function returns SQLITE_MISUSE.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_fk_conflicts(
|
|
|
+ sqlite3_changeset_iter *pIter, /* Changeset iterator */
|
|
|
+ int *pnOut /* OUT: Number of FK violations */
|
|
|
+);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Finalize A Changeset Iterator
|
|
|
+** METHOD: sqlite3_changeset_iter
|
|
|
+**
|
|
|
+** This function is used to finalize an iterator allocated with
|
|
|
+** [sqlite3changeset_start()].
|
|
|
+**
|
|
|
+** This function should only be called on iterators created using the
|
|
|
+** [sqlite3changeset_start()] function. If an application calls this
|
|
|
+** function with an iterator passed to a conflict-handler by
|
|
|
+** [sqlite3changeset_apply()], [SQLITE_MISUSE] is immediately returned and the
|
|
|
+** call has no effect.
|
|
|
+**
|
|
|
+** If an error was encountered within a call to an sqlite3changeset_xxx()
|
|
|
+** function (for example an [SQLITE_CORRUPT] in [sqlite3changeset_next()] or an
|
|
|
+** [SQLITE_NOMEM] in [sqlite3changeset_new()]) then an error code corresponding
|
|
|
+** to that error is returned by this function. Otherwise, SQLITE_OK is
|
|
|
+** returned. This is to allow the following pattern (pseudo-code):
|
|
|
+**
|
|
|
+** <pre>
|
|
|
+** sqlite3changeset_start();
|
|
|
+** while( SQLITE_ROW==sqlite3changeset_next() ){
|
|
|
+** // Do something with change.
|
|
|
+** }
|
|
|
+** rc = sqlite3changeset_finalize();
|
|
|
+** if( rc!=SQLITE_OK ){
|
|
|
+** // An error has occurred
|
|
|
+** }
|
|
|
+** </pre>
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_finalize(sqlite3_changeset_iter *pIter);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Invert A Changeset
|
|
|
+**
|
|
|
+** This function is used to "invert" a changeset object. Applying an inverted
|
|
|
+** changeset to a database reverses the effects of applying the uninverted
|
|
|
+** changeset. Specifically:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> Each DELETE change is changed to an INSERT, and
|
|
|
+** <li> Each INSERT change is changed to a DELETE, and
|
|
|
+** <li> For each UPDATE change, the old.* and new.* values are exchanged.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** This function does not change the order in which changes appear within
|
|
|
+** the changeset. It merely reverses the sense of each individual change.
|
|
|
+**
|
|
|
+** If successful, a pointer to a buffer containing the inverted changeset
|
|
|
+** is stored in *ppOut, the size of the same buffer is stored in *pnOut, and
|
|
|
+** SQLITE_OK is returned. If an error occurs, both *pnOut and *ppOut are
|
|
|
+** zeroed and an SQLite error code returned.
|
|
|
+**
|
|
|
+** It is the responsibility of the caller to eventually call sqlite3_free()
|
|
|
+** on the *ppOut pointer to free the buffer allocation following a successful
|
|
|
+** call to this function.
|
|
|
+**
|
|
|
+** WARNING/TODO: This function currently assumes that the input is a valid
|
|
|
+** changeset. If it is not, the results are undefined.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_invert(
|
|
|
+ int nIn, const void *pIn, /* Input changeset */
|
|
|
+ int *pnOut, void **ppOut /* OUT: Inverse of input */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Concatenate Two Changeset Objects
|
|
|
+**
|
|
|
+** This function is used to concatenate two changesets, A and B, into a
|
|
|
+** single changeset. The result is a changeset equivalent to applying
|
|
|
+** changeset A followed by changeset B.
|
|
|
+**
|
|
|
+** This function combines the two input changesets using an
|
|
|
+** sqlite3_changegroup object. Calling it produces similar results as the
|
|
|
+** following code fragment:
|
|
|
+**
|
|
|
+** <pre>
|
|
|
+** sqlite3_changegroup *pGrp;
|
|
|
+** rc = sqlite3_changegroup_new(&pGrp);
|
|
|
+** if( rc==SQLITE_OK ) rc = sqlite3changegroup_add(pGrp, nA, pA);
|
|
|
+** if( rc==SQLITE_OK ) rc = sqlite3changegroup_add(pGrp, nB, pB);
|
|
|
+** if( rc==SQLITE_OK ){
|
|
|
+** rc = sqlite3changegroup_output(pGrp, pnOut, ppOut);
|
|
|
+** }else{
|
|
|
+** *ppOut = 0;
|
|
|
+** *pnOut = 0;
|
|
|
+** }
|
|
|
+** </pre>
|
|
|
+**
|
|
|
+** Refer to the sqlite3_changegroup documentation below for details.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_concat(
|
|
|
+ int nA, /* Number of bytes in buffer pA */
|
|
|
+ void *pA, /* Pointer to buffer containing changeset A */
|
|
|
+ int nB, /* Number of bytes in buffer pB */
|
|
|
+ void *pB, /* Pointer to buffer containing changeset B */
|
|
|
+ int *pnOut, /* OUT: Number of bytes in output changeset */
|
|
|
+ void **ppOut /* OUT: Buffer containing output changeset */
|
|
|
+);
|
|
|
+
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Changegroup Handle
|
|
|
+**
|
|
|
+** A changegroup is an object used to combine two or more
|
|
|
+** [changesets] or [patchsets]
|
|
|
+*/
|
|
|
+typedef struct sqlite3_changegroup sqlite3_changegroup;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Create A New Changegroup Object
|
|
|
+** CONSTRUCTOR: sqlite3_changegroup
|
|
|
+**
|
|
|
+** An sqlite3_changegroup object is used to combine two or more changesets
|
|
|
+** (or patchsets) into a single changeset (or patchset). A single changegroup
|
|
|
+** object may combine changesets or patchsets, but not both. The output is
|
|
|
+** always in the same format as the input.
|
|
|
+**
|
|
|
+** If successful, this function returns SQLITE_OK and populates (*pp) with
|
|
|
+** a pointer to a new sqlite3_changegroup object before returning. The caller
|
|
|
+** should eventually free the returned object using a call to
|
|
|
+** sqlite3changegroup_delete(). If an error occurs, an SQLite error code
|
|
|
+** (i.e. SQLITE_NOMEM) is returned and *pp is set to NULL.
|
|
|
+**
|
|
|
+** The usual usage pattern for an sqlite3_changegroup object is as follows:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> It is created using a call to sqlite3changegroup_new().
|
|
|
+**
|
|
|
+** <li> Zero or more changesets (or patchsets) are added to the object
|
|
|
+** by calling sqlite3changegroup_add().
|
|
|
+**
|
|
|
+** <li> The result of combining all input changesets together is obtained
|
|
|
+** by the application via a call to sqlite3changegroup_output().
|
|
|
+**
|
|
|
+** <li> The object is deleted using a call to sqlite3changegroup_delete().
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** Any number of calls to add() and output() may be made between the calls to
|
|
|
+** new() and delete(), and in any order.
|
|
|
+**
|
|
|
+** As well as the regular sqlite3changegroup_add() and
|
|
|
+** sqlite3changegroup_output() functions, also available are the streaming
|
|
|
+** versions sqlite3changegroup_add_strm() and sqlite3changegroup_output_strm().
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changegroup_new(sqlite3_changegroup **pp);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Add A Changeset To A Changegroup
|
|
|
+** METHOD: sqlite3_changegroup
|
|
|
+**
|
|
|
+** Add all changes within the changeset (or patchset) in buffer pData (size
|
|
|
+** nData bytes) to the changegroup.
|
|
|
+**
|
|
|
+** If the buffer contains a patchset, then all prior calls to this function
|
|
|
+** on the same changegroup object must also have specified patchsets. Or, if
|
|
|
+** the buffer contains a changeset, so must have the earlier calls to this
|
|
|
+** function. Otherwise, SQLITE_ERROR is returned and no changes are added
|
|
|
+** to the changegroup.
|
|
|
+**
|
|
|
+** Rows within the changeset and changegroup are identified by the values in
|
|
|
+** their PRIMARY KEY columns. A change in the changeset is considered to
|
|
|
+** apply to the same row as a change already present in the changegroup if
|
|
|
+** the two rows have the same primary key.
|
|
|
+**
|
|
|
+** Changes to rows that do not already appear in the changegroup are
|
|
|
+** simply copied into it. Or, if both the new changeset and the changegroup
|
|
|
+** contain changes that apply to a single row, the final contents of the
|
|
|
+** changegroup depends on the type of each change, as follows:
|
|
|
+**
|
|
|
+** <table border=1 style="margin-left:8ex;margin-right:8ex">
|
|
|
+** <tr><th style="white-space:pre">Existing Change </th>
|
|
|
+** <th style="white-space:pre">New Change </th>
|
|
|
+** <th>Output Change
|
|
|
+** <tr><td>INSERT <td>INSERT <td>
|
|
|
+** The new change is ignored. This case does not occur if the new
|
|
|
+** changeset was recorded immediately after the changesets already
|
|
|
+** added to the changegroup.
|
|
|
+** <tr><td>INSERT <td>UPDATE <td>
|
|
|
+** The INSERT change remains in the changegroup. The values in the
|
|
|
+** INSERT change are modified as if the row was inserted by the
|
|
|
+** existing change and then updated according to the new change.
|
|
|
+** <tr><td>INSERT <td>DELETE <td>
|
|
|
+** The existing INSERT is removed from the changegroup. The DELETE is
|
|
|
+** not added.
|
|
|
+** <tr><td>UPDATE <td>INSERT <td>
|
|
|
+** The new change is ignored. This case does not occur if the new
|
|
|
+** changeset was recorded immediately after the changesets already
|
|
|
+** added to the changegroup.
|
|
|
+** <tr><td>UPDATE <td>UPDATE <td>
|
|
|
+** The existing UPDATE remains within the changegroup. It is amended
|
|
|
+** so that the accompanying values are as if the row was updated once
|
|
|
+** by the existing change and then again by the new change.
|
|
|
+** <tr><td>UPDATE <td>DELETE <td>
|
|
|
+** The existing UPDATE is replaced by the new DELETE within the
|
|
|
+** changegroup.
|
|
|
+** <tr><td>DELETE <td>INSERT <td>
|
|
|
+** If one or more of the column values in the row inserted by the
|
|
|
+** new change differ from those in the row deleted by the existing
|
|
|
+** change, the existing DELETE is replaced by an UPDATE within the
|
|
|
+** changegroup. Otherwise, if the inserted row is exactly the same
|
|
|
+** as the deleted row, the existing DELETE is simply discarded.
|
|
|
+** <tr><td>DELETE <td>UPDATE <td>
|
|
|
+** The new change is ignored. This case does not occur if the new
|
|
|
+** changeset was recorded immediately after the changesets already
|
|
|
+** added to the changegroup.
|
|
|
+** <tr><td>DELETE <td>DELETE <td>
|
|
|
+** The new change is ignored. This case does not occur if the new
|
|
|
+** changeset was recorded immediately after the changesets already
|
|
|
+** added to the changegroup.
|
|
|
+** </table>
|
|
|
+**
|
|
|
+** If the new changeset contains changes to a table that is already present
|
|
|
+** in the changegroup, then the number of columns and the position of the
|
|
|
+** primary key columns for the table must be consistent. If this is not the
|
|
|
+** case, this function fails with SQLITE_SCHEMA. If the input changeset
|
|
|
+** appears to be corrupt and the corruption is detected, SQLITE_CORRUPT is
|
|
|
+** returned. Or, if an out-of-memory condition occurs during processing, this
|
|
|
+** function returns SQLITE_NOMEM. In all cases, if an error occurs the state
|
|
|
+** of the final contents of the changegroup is undefined.
|
|
|
+**
|
|
|
+** If no error occurs, SQLITE_OK is returned.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changegroup_add(sqlite3_changegroup*, int nData, void *pData);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Obtain A Composite Changeset From A Changegroup
|
|
|
+** METHOD: sqlite3_changegroup
|
|
|
+**
|
|
|
+** Obtain a buffer containing a changeset (or patchset) representing the
|
|
|
+** current contents of the changegroup. If the inputs to the changegroup
|
|
|
+** were themselves changesets, the output is a changeset. Or, if the
|
|
|
+** inputs were patchsets, the output is also a patchset.
|
|
|
+**
|
|
|
+** As with the output of the sqlite3session_changeset() and
|
|
|
+** sqlite3session_patchset() functions, all changes related to a single
|
|
|
+** table are grouped together in the output of this function. Tables appear
|
|
|
+** in the same order as for the very first changeset added to the changegroup.
|
|
|
+** If the second or subsequent changesets added to the changegroup contain
|
|
|
+** changes for tables that do not appear in the first changeset, they are
|
|
|
+** appended onto the end of the output changeset, again in the order in
|
|
|
+** which they are first encountered.
|
|
|
+**
|
|
|
+** If an error occurs, an SQLite error code is returned and the output
|
|
|
+** variables (*pnData) and (*ppData) are set to 0. Otherwise, SQLITE_OK
|
|
|
+** is returned and the output variables are set to the size of and a
|
|
|
+** pointer to the output buffer, respectively. In this case it is the
|
|
|
+** responsibility of the caller to eventually free the buffer using a
|
|
|
+** call to sqlite3_free().
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changegroup_output(
|
|
|
+ sqlite3_changegroup*,
|
|
|
+ int *pnData, /* OUT: Size of output buffer in bytes */
|
|
|
+ void **ppData /* OUT: Pointer to output buffer */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Delete A Changegroup Object
|
|
|
+** DESTRUCTOR: sqlite3_changegroup
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3changegroup_delete(sqlite3_changegroup*);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Apply A Changeset To A Database
|
|
|
+**
|
|
|
+** Apply a changeset or patchset to a database. These functions attempt to
|
|
|
+** update the "main" database attached to handle db with the changes found in
|
|
|
+** the changeset passed via the second and third arguments.
|
|
|
+**
|
|
|
+** The fourth argument (xFilter) passed to these functions is the "filter
|
|
|
+** callback". If it is not NULL, then for each table affected by at least one
|
|
|
+** change in the changeset, the filter callback is invoked with
|
|
|
+** the table name as the second argument, and a copy of the context pointer
|
|
|
+** passed as the sixth argument as the first. If the "filter callback"
|
|
|
+** returns zero, then no attempt is made to apply any changes to the table.
|
|
|
+** Otherwise, if the return value is non-zero or the xFilter argument to
|
|
|
+** is NULL, all changes related to the table are attempted.
|
|
|
+**
|
|
|
+** For each table that is not excluded by the filter callback, this function
|
|
|
+** tests that the target database contains a compatible table. A table is
|
|
|
+** considered compatible if all of the following are true:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> The table has the same name as the name recorded in the
|
|
|
+** changeset, and
|
|
|
+** <li> The table has at least as many columns as recorded in the
|
|
|
+** changeset, and
|
|
|
+** <li> The table has primary key columns in the same position as
|
|
|
+** recorded in the changeset.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** If there is no compatible table, it is not an error, but none of the
|
|
|
+** changes associated with the table are applied. A warning message is issued
|
|
|
+** via the sqlite3_log() mechanism with the error code SQLITE_SCHEMA. At most
|
|
|
+** one such warning is issued for each table in the changeset.
|
|
|
+**
|
|
|
+** For each change for which there is a compatible table, an attempt is made
|
|
|
+** to modify the table contents according to the UPDATE, INSERT or DELETE
|
|
|
+** change. If a change cannot be applied cleanly, the conflict handler
|
|
|
+** function passed as the fifth argument to sqlite3changeset_apply() may be
|
|
|
+** invoked. A description of exactly when the conflict handler is invoked for
|
|
|
+** each type of change is below.
|
|
|
+**
|
|
|
+** Unlike the xFilter argument, xConflict may not be passed NULL. The results
|
|
|
+** of passing anything other than a valid function pointer as the xConflict
|
|
|
+** argument are undefined.
|
|
|
+**
|
|
|
+** Each time the conflict handler function is invoked, it must return one
|
|
|
+** of [SQLITE_CHANGESET_OMIT], [SQLITE_CHANGESET_ABORT] or
|
|
|
+** [SQLITE_CHANGESET_REPLACE]. SQLITE_CHANGESET_REPLACE may only be returned
|
|
|
+** if the second argument passed to the conflict handler is either
|
|
|
+** SQLITE_CHANGESET_DATA or SQLITE_CHANGESET_CONFLICT. If the conflict-handler
|
|
|
+** returns an illegal value, any changes already made are rolled back and
|
|
|
+** the call to sqlite3changeset_apply() returns SQLITE_MISUSE. Different
|
|
|
+** actions are taken by sqlite3changeset_apply() depending on the value
|
|
|
+** returned by each invocation of the conflict-handler function. Refer to
|
|
|
+** the documentation for the three
|
|
|
+** [SQLITE_CHANGESET_OMIT|available return values] for details.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** <dt>DELETE Changes<dd>
|
|
|
+** For each DELETE change, the function checks if the target database
|
|
|
+** contains a row with the same primary key value (or values) as the
|
|
|
+** original row values stored in the changeset. If it does, and the values
|
|
|
+** stored in all non-primary key columns also match the values stored in
|
|
|
+** the changeset the row is deleted from the target database.
|
|
|
+**
|
|
|
+** If a row with matching primary key values is found, but one or more of
|
|
|
+** the non-primary key fields contains a value different from the original
|
|
|
+** row value stored in the changeset, the conflict-handler function is
|
|
|
+** invoked with [SQLITE_CHANGESET_DATA] as the second argument. If the
|
|
|
+** database table has more columns than are recorded in the changeset,
|
|
|
+** only the values of those non-primary key fields are compared against
|
|
|
+** the current database contents - any trailing database table columns
|
|
|
+** are ignored.
|
|
|
+**
|
|
|
+** If no row with matching primary key values is found in the database,
|
|
|
+** the conflict-handler function is invoked with [SQLITE_CHANGESET_NOTFOUND]
|
|
|
+** passed as the second argument.
|
|
|
+**
|
|
|
+** If the DELETE operation is attempted, but SQLite returns SQLITE_CONSTRAINT
|
|
|
+** (which can only happen if a foreign key constraint is violated), the
|
|
|
+** conflict-handler function is invoked with [SQLITE_CHANGESET_CONSTRAINT]
|
|
|
+** passed as the second argument. This includes the case where the DELETE
|
|
|
+** operation is attempted because an earlier call to the conflict handler
|
|
|
+** function returned [SQLITE_CHANGESET_REPLACE].
|
|
|
+**
|
|
|
+** <dt>INSERT Changes<dd>
|
|
|
+** For each INSERT change, an attempt is made to insert the new row into
|
|
|
+** the database. If the changeset row contains fewer fields than the
|
|
|
+** database table, the trailing fields are populated with their default
|
|
|
+** values.
|
|
|
+**
|
|
|
+** If the attempt to insert the row fails because the database already
|
|
|
+** contains a row with the same primary key values, the conflict handler
|
|
|
+** function is invoked with the second argument set to
|
|
|
+** [SQLITE_CHANGESET_CONFLICT].
|
|
|
+**
|
|
|
+** If the attempt to insert the row fails because of some other constraint
|
|
|
+** violation (e.g. NOT NULL or UNIQUE), the conflict handler function is
|
|
|
+** invoked with the second argument set to [SQLITE_CHANGESET_CONSTRAINT].
|
|
|
+** This includes the case where the INSERT operation is re-attempted because
|
|
|
+** an earlier call to the conflict handler function returned
|
|
|
+** [SQLITE_CHANGESET_REPLACE].
|
|
|
+**
|
|
|
+** <dt>UPDATE Changes<dd>
|
|
|
+** For each UPDATE change, the function checks if the target database
|
|
|
+** contains a row with the same primary key value (or values) as the
|
|
|
+** original row values stored in the changeset. If it does, and the values
|
|
|
+** stored in all modified non-primary key columns also match the values
|
|
|
+** stored in the changeset the row is updated within the target database.
|
|
|
+**
|
|
|
+** If a row with matching primary key values is found, but one or more of
|
|
|
+** the modified non-primary key fields contains a value different from an
|
|
|
+** original row value stored in the changeset, the conflict-handler function
|
|
|
+** is invoked with [SQLITE_CHANGESET_DATA] as the second argument. Since
|
|
|
+** UPDATE changes only contain values for non-primary key fields that are
|
|
|
+** to be modified, only those fields need to match the original values to
|
|
|
+** avoid the SQLITE_CHANGESET_DATA conflict-handler callback.
|
|
|
+**
|
|
|
+** If no row with matching primary key values is found in the database,
|
|
|
+** the conflict-handler function is invoked with [SQLITE_CHANGESET_NOTFOUND]
|
|
|
+** passed as the second argument.
|
|
|
+**
|
|
|
+** If the UPDATE operation is attempted, but SQLite returns
|
|
|
+** SQLITE_CONSTRAINT, the conflict-handler function is invoked with
|
|
|
+** [SQLITE_CHANGESET_CONSTRAINT] passed as the second argument.
|
|
|
+** This includes the case where the UPDATE operation is attempted after
|
|
|
+** an earlier call to the conflict handler function returned
|
|
|
+** [SQLITE_CHANGESET_REPLACE].
|
|
|
+** </dl>
|
|
|
+**
|
|
|
+** It is safe to execute SQL statements, including those that write to the
|
|
|
+** table that the callback related to, from within the xConflict callback.
|
|
|
+** This can be used to further customize the application's conflict
|
|
|
+** resolution strategy.
|
|
|
+**
|
|
|
+** All changes made by these functions are enclosed in a savepoint transaction.
|
|
|
+** If any other error (aside from a constraint failure when attempting to
|
|
|
+** write to the target database) occurs, then the savepoint transaction is
|
|
|
+** rolled back, restoring the target database to its original state, and an
|
|
|
+** SQLite error code returned.
|
|
|
+**
|
|
|
+** If the output parameters (ppRebase) and (pnRebase) are non-NULL and
|
|
|
+** the input is a changeset (not a patchset), then sqlite3changeset_apply_v2()
|
|
|
+** may set (*ppRebase) to point to a "rebase" that may be used with the
|
|
|
+** sqlite3_rebaser APIs buffer before returning. In this case (*pnRebase)
|
|
|
+** is set to the size of the buffer in bytes. It is the responsibility of the
|
|
|
+** caller to eventually free any such buffer using sqlite3_free(). The buffer
|
|
|
+** is only allocated and populated if one or more conflicts were encountered
|
|
|
+** while applying the patchset. See comments surrounding the sqlite3_rebaser
|
|
|
+** APIs for further details.
|
|
|
+**
|
|
|
+** The behavior of sqlite3changeset_apply_v2() and its streaming equivalent
|
|
|
+** may be modified by passing a combination of
|
|
|
+** [SQLITE_CHANGESETAPPLY_NOSAVEPOINT | supported flags] as the 9th parameter.
|
|
|
+**
|
|
|
+** Note that the sqlite3changeset_apply_v2() API is still <b>experimental</b>
|
|
|
+** and therefore subject to change.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_apply(
|
|
|
+ sqlite3 *db, /* Apply change to "main" db of this handle */
|
|
|
+ int nChangeset, /* Size of changeset in bytes */
|
|
|
+ void *pChangeset, /* Changeset blob */
|
|
|
+ int(*xFilter)(
|
|
|
+ void *pCtx, /* Copy of sixth arg to _apply() */
|
|
|
+ const char *zTab /* Table name */
|
|
|
+ ),
|
|
|
+ int(*xConflict)(
|
|
|
+ void *pCtx, /* Copy of sixth arg to _apply() */
|
|
|
+ int eConflict, /* DATA, MISSING, CONFLICT, CONSTRAINT */
|
|
|
+ sqlite3_changeset_iter *p /* Handle describing change and conflict */
|
|
|
+ ),
|
|
|
+ void *pCtx /* First argument passed to xConflict */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3changeset_apply_v2(
|
|
|
+ sqlite3 *db, /* Apply change to "main" db of this handle */
|
|
|
+ int nChangeset, /* Size of changeset in bytes */
|
|
|
+ void *pChangeset, /* Changeset blob */
|
|
|
+ int(*xFilter)(
|
|
|
+ void *pCtx, /* Copy of sixth arg to _apply() */
|
|
|
+ const char *zTab /* Table name */
|
|
|
+ ),
|
|
|
+ int(*xConflict)(
|
|
|
+ void *pCtx, /* Copy of sixth arg to _apply() */
|
|
|
+ int eConflict, /* DATA, MISSING, CONFLICT, CONSTRAINT */
|
|
|
+ sqlite3_changeset_iter *p /* Handle describing change and conflict */
|
|
|
+ ),
|
|
|
+ void *pCtx, /* First argument passed to xConflict */
|
|
|
+ void **ppRebase, int *pnRebase, /* OUT: Rebase data */
|
|
|
+ int flags /* SESSION_CHANGESETAPPLY_* flags */
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Flags for sqlite3changeset_apply_v2
|
|
|
+**
|
|
|
+** The following flags may passed via the 9th parameter to
|
|
|
+** [sqlite3changeset_apply_v2] and [sqlite3changeset_apply_v2_strm]:
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** <dt>SQLITE_CHANGESETAPPLY_NOSAVEPOINT <dd>
|
|
|
+** Usually, the sessions module encloses all operations performed by
|
|
|
+** a single call to apply_v2() or apply_v2_strm() in a [SAVEPOINT]. The
|
|
|
+** SAVEPOINT is committed if the changeset or patchset is successfully
|
|
|
+** applied, or rolled back if an error occurs. Specifying this flag
|
|
|
+** causes the sessions module to omit this savepoint. In this case, if the
|
|
|
+** caller has an open transaction or savepoint when apply_v2() is called,
|
|
|
+** it may revert the partially applied changeset by rolling it back.
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHANGESETAPPLY_INVERT <dd>
|
|
|
+** Invert the changeset before applying it. This is equivalent to inverting
|
|
|
+** a changeset using sqlite3changeset_invert() before applying it. It is
|
|
|
+** an error to specify this flag with a patchset.
|
|
|
+*/
|
|
|
+#define SQLITE_CHANGESETAPPLY_NOSAVEPOINT 0x0001
|
|
|
+#define SQLITE_CHANGESETAPPLY_INVERT 0x0002
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Constants Passed To The Conflict Handler
|
|
|
+**
|
|
|
+** Values that may be passed as the second argument to a conflict-handler.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** <dt>SQLITE_CHANGESET_DATA<dd>
|
|
|
+** The conflict handler is invoked with CHANGESET_DATA as the second argument
|
|
|
+** when processing a DELETE or UPDATE change if a row with the required
|
|
|
+** PRIMARY KEY fields is present in the database, but one or more other
|
|
|
+** (non primary-key) fields modified by the update do not contain the
|
|
|
+** expected "before" values.
|
|
|
+**
|
|
|
+** The conflicting row, in this case, is the database row with the matching
|
|
|
+** primary key.
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHANGESET_NOTFOUND<dd>
|
|
|
+** The conflict handler is invoked with CHANGESET_NOTFOUND as the second
|
|
|
+** argument when processing a DELETE or UPDATE change if a row with the
|
|
|
+** required PRIMARY KEY fields is not present in the database.
|
|
|
+**
|
|
|
+** There is no conflicting row in this case. The results of invoking the
|
|
|
+** sqlite3changeset_conflict() API are undefined.
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHANGESET_CONFLICT<dd>
|
|
|
+** CHANGESET_CONFLICT is passed as the second argument to the conflict
|
|
|
+** handler while processing an INSERT change if the operation would result
|
|
|
+** in duplicate primary key values.
|
|
|
+**
|
|
|
+** The conflicting row in this case is the database row with the matching
|
|
|
+** primary key.
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHANGESET_FOREIGN_KEY<dd>
|
|
|
+** If foreign key handling is enabled, and applying a changeset leaves the
|
|
|
+** database in a state containing foreign key violations, the conflict
|
|
|
+** handler is invoked with CHANGESET_FOREIGN_KEY as the second argument
|
|
|
+** exactly once before the changeset is committed. If the conflict handler
|
|
|
+** returns CHANGESET_OMIT, the changes, including those that caused the
|
|
|
+** foreign key constraint violation, are committed. Or, if it returns
|
|
|
+** CHANGESET_ABORT, the changeset is rolled back.
|
|
|
+**
|
|
|
+** No current or conflicting row information is provided. The only function
|
|
|
+** it is possible to call on the supplied sqlite3_changeset_iter handle
|
|
|
+** is sqlite3changeset_fk_conflicts().
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHANGESET_CONSTRAINT<dd>
|
|
|
+** If any other constraint violation occurs while applying a change (i.e.
|
|
|
+** a UNIQUE, CHECK or NOT NULL constraint), the conflict handler is
|
|
|
+** invoked with CHANGESET_CONSTRAINT as the second argument.
|
|
|
+**
|
|
|
+** There is no conflicting row in this case. The results of invoking the
|
|
|
+** sqlite3changeset_conflict() API are undefined.
|
|
|
+**
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_CHANGESET_DATA 1
|
|
|
+#define SQLITE_CHANGESET_NOTFOUND 2
|
|
|
+#define SQLITE_CHANGESET_CONFLICT 3
|
|
|
+#define SQLITE_CHANGESET_CONSTRAINT 4
|
|
|
+#define SQLITE_CHANGESET_FOREIGN_KEY 5
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Constants Returned By The Conflict Handler
|
|
|
+**
|
|
|
+** A conflict handler callback must return one of the following three values.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** <dt>SQLITE_CHANGESET_OMIT<dd>
|
|
|
+** If a conflict handler returns this value no special action is taken. The
|
|
|
+** change that caused the conflict is not applied. The session module
|
|
|
+** continues to the next change in the changeset.
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHANGESET_REPLACE<dd>
|
|
|
+** This value may only be returned if the second argument to the conflict
|
|
|
+** handler was SQLITE_CHANGESET_DATA or SQLITE_CHANGESET_CONFLICT. If this
|
|
|
+** is not the case, any changes applied so far are rolled back and the
|
|
|
+** call to sqlite3changeset_apply() returns SQLITE_MISUSE.
|
|
|
+**
|
|
|
+** If CHANGESET_REPLACE is returned by an SQLITE_CHANGESET_DATA conflict
|
|
|
+** handler, then the conflicting row is either updated or deleted, depending
|
|
|
+** on the type of change.
|
|
|
+**
|
|
|
+** If CHANGESET_REPLACE is returned by an SQLITE_CHANGESET_CONFLICT conflict
|
|
|
+** handler, then the conflicting row is removed from the database and a
|
|
|
+** second attempt to apply the change is made. If this second attempt fails,
|
|
|
+** the original row is restored to the database before continuing.
|
|
|
+**
|
|
|
+** <dt>SQLITE_CHANGESET_ABORT<dd>
|
|
|
+** If this value is returned, any changes applied so far are rolled back
|
|
|
+** and the call to sqlite3changeset_apply() returns SQLITE_ABORT.
|
|
|
+** </dl>
|
|
|
+*/
|
|
|
+#define SQLITE_CHANGESET_OMIT 0
|
|
|
+#define SQLITE_CHANGESET_REPLACE 1
|
|
|
+#define SQLITE_CHANGESET_ABORT 2
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Rebasing changesets
|
|
|
+** EXPERIMENTAL
|
|
|
+**
|
|
|
+** Suppose there is a site hosting a database in state S0. And that
|
|
|
+** modifications are made that move that database to state S1 and a
|
|
|
+** changeset recorded (the "local" changeset). Then, a changeset based
|
|
|
+** on S0 is received from another site (the "remote" changeset) and
|
|
|
+** applied to the database. The database is then in state
|
|
|
+** (S1+"remote"), where the exact state depends on any conflict
|
|
|
+** resolution decisions (OMIT or REPLACE) made while applying "remote".
|
|
|
+** Rebasing a changeset is to update it to take those conflict
|
|
|
+** resolution decisions into account, so that the same conflicts
|
|
|
+** do not have to be resolved elsewhere in the network.
|
|
|
+**
|
|
|
+** For example, if both the local and remote changesets contain an
|
|
|
+** INSERT of the same key on "CREATE TABLE t1(a PRIMARY KEY, b)":
|
|
|
+**
|
|
|
+** local: INSERT INTO t1 VALUES(1, 'v1');
|
|
|
+** remote: INSERT INTO t1 VALUES(1, 'v2');
|
|
|
+**
|
|
|
+** and the conflict resolution is REPLACE, then the INSERT change is
|
|
|
+** removed from the local changeset (it was overridden). Or, if the
|
|
|
+** conflict resolution was "OMIT", then the local changeset is modified
|
|
|
+** to instead contain:
|
|
|
+**
|
|
|
+** UPDATE t1 SET b = 'v2' WHERE a=1;
|
|
|
+**
|
|
|
+** Changes within the local changeset are rebased as follows:
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** <dt>Local INSERT<dd>
|
|
|
+** This may only conflict with a remote INSERT. If the conflict
|
|
|
+** resolution was OMIT, then add an UPDATE change to the rebased
|
|
|
+** changeset. Or, if the conflict resolution was REPLACE, add
|
|
|
+** nothing to the rebased changeset.
|
|
|
+**
|
|
|
+** <dt>Local DELETE<dd>
|
|
|
+** This may conflict with a remote UPDATE or DELETE. In both cases the
|
|
|
+** only possible resolution is OMIT. If the remote operation was a
|
|
|
+** DELETE, then add no change to the rebased changeset. If the remote
|
|
|
+** operation was an UPDATE, then the old.* fields of change are updated
|
|
|
+** to reflect the new.* values in the UPDATE.
|
|
|
+**
|
|
|
+** <dt>Local UPDATE<dd>
|
|
|
+** This may conflict with a remote UPDATE or DELETE. If it conflicts
|
|
|
+** with a DELETE, and the conflict resolution was OMIT, then the update
|
|
|
+** is changed into an INSERT. Any undefined values in the new.* record
|
|
|
+** from the update change are filled in using the old.* values from
|
|
|
+** the conflicting DELETE. Or, if the conflict resolution was REPLACE,
|
|
|
+** the UPDATE change is simply omitted from the rebased changeset.
|
|
|
+**
|
|
|
+** If conflict is with a remote UPDATE and the resolution is OMIT, then
|
|
|
+** the old.* values are rebased using the new.* values in the remote
|
|
|
+** change. Or, if the resolution is REPLACE, then the change is copied
|
|
|
+** into the rebased changeset with updates to columns also updated by
|
|
|
+** the conflicting remote UPDATE removed. If this means no columns would
|
|
|
+** be updated, the change is omitted.
|
|
|
+** </dl>
|
|
|
+**
|
|
|
+** A local change may be rebased against multiple remote changes
|
|
|
+** simultaneously. If a single key is modified by multiple remote
|
|
|
+** changesets, they are combined as follows before the local changeset
|
|
|
+** is rebased:
|
|
|
+**
|
|
|
+** <ul>
|
|
|
+** <li> If there has been one or more REPLACE resolutions on a
|
|
|
+** key, it is rebased according to a REPLACE.
|
|
|
+**
|
|
|
+** <li> If there have been no REPLACE resolutions on a key, then
|
|
|
+** the local changeset is rebased according to the most recent
|
|
|
+** of the OMIT resolutions.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** Note that conflict resolutions from multiple remote changesets are
|
|
|
+** combined on a per-field basis, not per-row. This means that in the
|
|
|
+** case of multiple remote UPDATE operations, some fields of a single
|
|
|
+** local change may be rebased for REPLACE while others are rebased for
|
|
|
+** OMIT.
|
|
|
+**
|
|
|
+** In order to rebase a local changeset, the remote changeset must first
|
|
|
+** be applied to the local database using sqlite3changeset_apply_v2() and
|
|
|
+** the buffer of rebase information captured. Then:
|
|
|
+**
|
|
|
+** <ol>
|
|
|
+** <li> An sqlite3_rebaser object is created by calling
|
|
|
+** sqlite3rebaser_create().
|
|
|
+** <li> The new object is configured with the rebase buffer obtained from
|
|
|
+** sqlite3changeset_apply_v2() by calling sqlite3rebaser_configure().
|
|
|
+** If the local changeset is to be rebased against multiple remote
|
|
|
+** changesets, then sqlite3rebaser_configure() should be called
|
|
|
+** multiple times, in the same order that the multiple
|
|
|
+** sqlite3changeset_apply_v2() calls were made.
|
|
|
+** <li> Each local changeset is rebased by calling sqlite3rebaser_rebase().
|
|
|
+** <li> The sqlite3_rebaser object is deleted by calling
|
|
|
+** sqlite3rebaser_delete().
|
|
|
+** </ol>
|
|
|
+*/
|
|
|
+typedef struct sqlite3_rebaser sqlite3_rebaser;
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Create a changeset rebaser object.
|
|
|
+** EXPERIMENTAL
|
|
|
+**
|
|
|
+** Allocate a new changeset rebaser object. If successful, set (*ppNew) to
|
|
|
+** point to the new object and return SQLITE_OK. Otherwise, if an error
|
|
|
+** occurs, return an SQLite error code (e.g. SQLITE_NOMEM) and set (*ppNew)
|
|
|
+** to NULL.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3rebaser_create(sqlite3_rebaser **ppNew);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Configure a changeset rebaser object.
|
|
|
+** EXPERIMENTAL
|
|
|
+**
|
|
|
+** Configure the changeset rebaser object to rebase changesets according
|
|
|
+** to the conflict resolutions described by buffer pRebase (size nRebase
|
|
|
+** bytes), which must have been obtained from a previous call to
|
|
|
+** sqlite3changeset_apply_v2().
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3rebaser_configure(
|
|
|
+ sqlite3_rebaser*,
|
|
|
+ int nRebase, const void *pRebase
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Rebase a changeset
|
|
|
+** EXPERIMENTAL
|
|
|
+**
|
|
|
+** Argument pIn must point to a buffer containing a changeset nIn bytes
|
|
|
+** in size. This function allocates and populates a buffer with a copy
|
|
|
+** of the changeset rebased according to the configuration of the
|
|
|
+** rebaser object passed as the first argument. If successful, (*ppOut)
|
|
|
+** is set to point to the new buffer containing the rebased changeset and
|
|
|
+** (*pnOut) to its size in bytes and SQLITE_OK returned. It is the
|
|
|
+** responsibility of the caller to eventually free the new buffer using
|
|
|
+** sqlite3_free(). Otherwise, if an error occurs, (*ppOut) and (*pnOut)
|
|
|
+** are set to zero and an SQLite error code returned.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3rebaser_rebase(
|
|
|
+ sqlite3_rebaser*,
|
|
|
+ int nIn, const void *pIn,
|
|
|
+ int *pnOut, void **ppOut
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Delete a changeset rebaser object.
|
|
|
+** EXPERIMENTAL
|
|
|
+**
|
|
|
+** Delete the changeset rebaser object and all associated resources. There
|
|
|
+** should be one call to this function for each successful invocation
|
|
|
+** of sqlite3rebaser_create().
|
|
|
+*/
|
|
|
+SQLITE_API void sqlite3rebaser_delete(sqlite3_rebaser *p);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Streaming Versions of API functions.
|
|
|
+**
|
|
|
+** The six streaming API xxx_strm() functions serve similar purposes to the
|
|
|
+** corresponding non-streaming API functions:
|
|
|
+**
|
|
|
+** <table border=1 style="margin-left:8ex;margin-right:8ex">
|
|
|
+** <tr><th>Streaming function<th>Non-streaming equivalent</th>
|
|
|
+** <tr><td>sqlite3changeset_apply_strm<td>[sqlite3changeset_apply]
|
|
|
+** <tr><td>sqlite3changeset_apply_strm_v2<td>[sqlite3changeset_apply_v2]
|
|
|
+** <tr><td>sqlite3changeset_concat_strm<td>[sqlite3changeset_concat]
|
|
|
+** <tr><td>sqlite3changeset_invert_strm<td>[sqlite3changeset_invert]
|
|
|
+** <tr><td>sqlite3changeset_start_strm<td>[sqlite3changeset_start]
|
|
|
+** <tr><td>sqlite3session_changeset_strm<td>[sqlite3session_changeset]
|
|
|
+** <tr><td>sqlite3session_patchset_strm<td>[sqlite3session_patchset]
|
|
|
+** </table>
|
|
|
+**
|
|
|
+** Non-streaming functions that accept changesets (or patchsets) as input
|
|
|
+** require that the entire changeset be stored in a single buffer in memory.
|
|
|
+** Similarly, those that return a changeset or patchset do so by returning
|
|
|
+** a pointer to a single large buffer allocated using sqlite3_malloc().
|
|
|
+** Normally this is convenient. However, if an application running in a
|
|
|
+** low-memory environment is required to handle very large changesets, the
|
|
|
+** large contiguous memory allocations required can become onerous.
|
|
|
+**
|
|
|
+** In order to avoid this problem, instead of a single large buffer, input
|
|
|
+** is passed to a streaming API functions by way of a callback function that
|
|
|
+** the sessions module invokes to incrementally request input data as it is
|
|
|
+** required. In all cases, a pair of API function parameters such as
|
|
|
+**
|
|
|
+** <pre>
|
|
|
+** int nChangeset,
|
|
|
+** void *pChangeset,
|
|
|
+** </pre>
|
|
|
+**
|
|
|
+** Is replaced by:
|
|
|
+**
|
|
|
+** <pre>
|
|
|
+** int (*xInput)(void *pIn, void *pData, int *pnData),
|
|
|
+** void *pIn,
|
|
|
+** </pre>
|
|
|
+**
|
|
|
+** Each time the xInput callback is invoked by the sessions module, the first
|
|
|
+** argument passed is a copy of the supplied pIn context pointer. The second
|
|
|
+** argument, pData, points to a buffer (*pnData) bytes in size. Assuming no
|
|
|
+** error occurs the xInput method should copy up to (*pnData) bytes of data
|
|
|
+** into the buffer and set (*pnData) to the actual number of bytes copied
|
|
|
+** before returning SQLITE_OK. If the input is completely exhausted, (*pnData)
|
|
|
+** should be set to zero to indicate this. Or, if an error occurs, an SQLite
|
|
|
+** error code should be returned. In all cases, if an xInput callback returns
|
|
|
+** an error, all processing is abandoned and the streaming API function
|
|
|
+** returns a copy of the error code to the caller.
|
|
|
+**
|
|
|
+** In the case of sqlite3changeset_start_strm(), the xInput callback may be
|
|
|
+** invoked by the sessions module at any point during the lifetime of the
|
|
|
+** iterator. If such an xInput callback returns an error, the iterator enters
|
|
|
+** an error state, whereby all subsequent calls to iterator functions
|
|
|
+** immediately fail with the same error code as returned by xInput.
|
|
|
+**
|
|
|
+** Similarly, streaming API functions that return changesets (or patchsets)
|
|
|
+** return them in chunks by way of a callback function instead of via a
|
|
|
+** pointer to a single large buffer. In this case, a pair of parameters such
|
|
|
+** as:
|
|
|
+**
|
|
|
+** <pre>
|
|
|
+** int *pnChangeset,
|
|
|
+** void **ppChangeset,
|
|
|
+** </pre>
|
|
|
+**
|
|
|
+** Is replaced by:
|
|
|
+**
|
|
|
+** <pre>
|
|
|
+** int (*xOutput)(void *pOut, const void *pData, int nData),
|
|
|
+** void *pOut
|
|
|
+** </pre>
|
|
|
+**
|
|
|
+** The xOutput callback is invoked zero or more times to return data to
|
|
|
+** the application. The first parameter passed to each call is a copy of the
|
|
|
+** pOut pointer supplied by the application. The second parameter, pData,
|
|
|
+** points to a buffer nData bytes in size containing the chunk of output
|
|
|
+** data being returned. If the xOutput callback successfully processes the
|
|
|
+** supplied data, it should return SQLITE_OK to indicate success. Otherwise,
|
|
|
+** it should return some other SQLite error code. In this case processing
|
|
|
+** is immediately abandoned and the streaming API function returns a copy
|
|
|
+** of the xOutput error code to the application.
|
|
|
+**
|
|
|
+** The sessions module never invokes an xOutput callback with the third
|
|
|
+** parameter set to a value less than or equal to zero. Other than this,
|
|
|
+** no guarantees are made as to the size of the chunks of data returned.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3changeset_apply_strm(
|
|
|
+ sqlite3 *db, /* Apply change to "main" db of this handle */
|
|
|
+ int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
|
|
|
+ void *pIn, /* First arg for xInput */
|
|
|
+ int(*xFilter)(
|
|
|
+ void *pCtx, /* Copy of sixth arg to _apply() */
|
|
|
+ const char *zTab /* Table name */
|
|
|
+ ),
|
|
|
+ int(*xConflict)(
|
|
|
+ void *pCtx, /* Copy of sixth arg to _apply() */
|
|
|
+ int eConflict, /* DATA, MISSING, CONFLICT, CONSTRAINT */
|
|
|
+ sqlite3_changeset_iter *p /* Handle describing change and conflict */
|
|
|
+ ),
|
|
|
+ void *pCtx /* First argument passed to xConflict */
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3changeset_apply_v2_strm(
|
|
|
+ sqlite3 *db, /* Apply change to "main" db of this handle */
|
|
|
+ int (*xInput)(void *pIn, void *pData, int *pnData), /* Input function */
|
|
|
+ void *pIn, /* First arg for xInput */
|
|
|
+ int(*xFilter)(
|
|
|
+ void *pCtx, /* Copy of sixth arg to _apply() */
|
|
|
+ const char *zTab /* Table name */
|
|
|
+ ),
|
|
|
+ int(*xConflict)(
|
|
|
+ void *pCtx, /* Copy of sixth arg to _apply() */
|
|
|
+ int eConflict, /* DATA, MISSING, CONFLICT, CONSTRAINT */
|
|
|
+ sqlite3_changeset_iter *p /* Handle describing change and conflict */
|
|
|
+ ),
|
|
|
+ void *pCtx, /* First argument passed to xConflict */
|
|
|
+ void **ppRebase, int *pnRebase,
|
|
|
+ int flags
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3changeset_concat_strm(
|
|
|
+ int (*xInputA)(void *pIn, void *pData, int *pnData),
|
|
|
+ void *pInA,
|
|
|
+ int (*xInputB)(void *pIn, void *pData, int *pnData),
|
|
|
+ void *pInB,
|
|
|
+ int (*xOutput)(void *pOut, const void *pData, int nData),
|
|
|
+ void *pOut
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3changeset_invert_strm(
|
|
|
+ int (*xInput)(void *pIn, void *pData, int *pnData),
|
|
|
+ void *pIn,
|
|
|
+ int (*xOutput)(void *pOut, const void *pData, int nData),
|
|
|
+ void *pOut
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3changeset_start_strm(
|
|
|
+ sqlite3_changeset_iter **pp,
|
|
|
+ int (*xInput)(void *pIn, void *pData, int *pnData),
|
|
|
+ void *pIn
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3changeset_start_v2_strm(
|
|
|
+ sqlite3_changeset_iter **pp,
|
|
|
+ int (*xInput)(void *pIn, void *pData, int *pnData),
|
|
|
+ void *pIn,
|
|
|
+ int flags
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3session_changeset_strm(
|
|
|
+ sqlite3_session *pSession,
|
|
|
+ int (*xOutput)(void *pOut, const void *pData, int nData),
|
|
|
+ void *pOut
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3session_patchset_strm(
|
|
|
+ sqlite3_session *pSession,
|
|
|
+ int (*xOutput)(void *pOut, const void *pData, int nData),
|
|
|
+ void *pOut
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3changegroup_add_strm(sqlite3_changegroup*,
|
|
|
+ int (*xInput)(void *pIn, void *pData, int *pnData),
|
|
|
+ void *pIn
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3changegroup_output_strm(sqlite3_changegroup*,
|
|
|
+ int (*xOutput)(void *pOut, const void *pData, int nData),
|
|
|
+ void *pOut
|
|
|
+);
|
|
|
+SQLITE_API int sqlite3rebaser_rebase_strm(
|
|
|
+ sqlite3_rebaser *pRebaser,
|
|
|
+ int (*xInput)(void *pIn, void *pData, int *pnData),
|
|
|
+ void *pIn,
|
|
|
+ int (*xOutput)(void *pOut, const void *pData, int nData),
|
|
|
+ void *pOut
|
|
|
+);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Configure global parameters
|
|
|
+**
|
|
|
+** The sqlite3session_config() interface is used to make global configuration
|
|
|
+** changes to the sessions module in order to tune it to the specific needs
|
|
|
+** of the application.
|
|
|
+**
|
|
|
+** The sqlite3session_config() interface is not threadsafe. If it is invoked
|
|
|
+** while any other thread is inside any other sessions method then the
|
|
|
+** results are undefined. Furthermore, if it is invoked after any sessions
|
|
|
+** related objects have been created, the results are also undefined.
|
|
|
+**
|
|
|
+** The first argument to the sqlite3session_config() function must be one
|
|
|
+** of the SQLITE_SESSION_CONFIG_XXX constants defined below. The
|
|
|
+** interpretation of the (void*) value passed as the second parameter and
|
|
|
+** the effect of calling this function depends on the value of the first
|
|
|
+** parameter.
|
|
|
+**
|
|
|
+** <dl>
|
|
|
+** <dt>SQLITE_SESSION_CONFIG_STRMSIZE<dd>
|
|
|
+** By default, the sessions module streaming interfaces attempt to input
|
|
|
+** and output data in approximately 1 KiB chunks. This operand may be used
|
|
|
+** to set and query the value of this configuration setting. The pointer
|
|
|
+** passed as the second argument must point to a value of type (int).
|
|
|
+** If this value is greater than 0, it is used as the new streaming data
|
|
|
+** chunk size for both input and output. Before returning, the (int) value
|
|
|
+** pointed to by pArg is set to the final value of the streaming interface
|
|
|
+** chunk size.
|
|
|
+** </dl>
|
|
|
+**
|
|
|
+** This function returns SQLITE_OK if successful, or an SQLite error code
|
|
|
+** otherwise.
|
|
|
+*/
|
|
|
+SQLITE_API int sqlite3session_config(int op, void *pArg);
|
|
|
+
|
|
|
+/*
|
|
|
+** CAPI3REF: Values for sqlite3session_config().
|
|
|
+*/
|
|
|
+#define SQLITE_SESSION_CONFIG_STRMSIZE 1
|
|
|
+
|
|
|
+/*
|
|
|
+** Make sure we can call this stuff from C++.
|
|
|
+*/
|
|
|
+#ifdef __cplusplus
|
|
|
+}
|
|
|
+#endif
|
|
|
+
|
|
|
+#endif /* !defined(__SQLITESESSION_H_) && defined(SQLITE_ENABLE_SESSION) */
|
|
|
+
|
|
|
+/******** End of sqlite3session.h *********/
|
|
|
+/******** Begin file fts5.h *********/
|
|
|
+/*
|
|
|
+** 2014 May 31
|
|
|
+**
|
|
|
+** The author disclaims copyright to this source code. In place of
|
|
|
+** a legal notice, here is a blessing:
|
|
|
+**
|
|
|
+** May you do good and not evil.
|
|
|
+** May you find forgiveness for yourself and forgive others.
|
|
|
+** May you share freely, never taking more than you give.
|
|
|
+**
|
|
|
+******************************************************************************
|
|
|
+**
|
|
|
+** Interfaces to extend FTS5. Using the interfaces defined in this file,
|
|
|
+** FTS5 may be extended with:
|
|
|
+**
|
|
|
+** * custom tokenizers, and
|
|
|
+** * custom auxiliary functions.
|
|
|
+*/
|
|
|
+
|
|
|
+
|
|
|
+#ifndef _FTS5_H
|
|
|
+#define _FTS5_H
|
|
|
+
|
|
|
+
|
|
|
+#ifdef __cplusplus
|
|
|
+extern "C" {
|
|
|
+#endif
|
|
|
+
|
|
|
+/*************************************************************************
|
|
|
+** CUSTOM AUXILIARY FUNCTIONS
|
|
|
+**
|
|
|
+** Virtual table implementations may overload SQL functions by implementing
|
|
|
+** the sqlite3_module.xFindFunction() method.
|
|
|
+*/
|
|
|
+
|
|
|
+typedef struct Fts5ExtensionApi Fts5ExtensionApi;
|
|
|
+typedef struct Fts5Context Fts5Context;
|
|
|
+typedef struct Fts5PhraseIter Fts5PhraseIter;
|
|
|
+
|
|
|
+typedef void (*fts5_extension_function)(
|
|
|
+ const Fts5ExtensionApi *pApi, /* API offered by current FTS version */
|
|
|
+ Fts5Context *pFts, /* First arg to pass to pApi functions */
|
|
|
+ sqlite3_context *pCtx, /* Context for returning result/error */
|
|
|
+ int nVal, /* Number of values in apVal[] array */
|
|
|
+ sqlite3_value **apVal /* Array of trailing arguments */
|
|
|
+);
|
|
|
+
|
|
|
+struct Fts5PhraseIter {
|
|
|
+ const unsigned char *a;
|
|
|
+ const unsigned char *b;
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** EXTENSION API FUNCTIONS
|
|
|
+**
|
|
|
+** xUserData(pFts):
|
|
|
+** Return a copy of the context pointer the extension function was
|
|
|
+** registered with.
|
|
|
+**
|
|
|
+** xColumnTotalSize(pFts, iCol, pnToken):
|
|
|
+** If parameter iCol is less than zero, set output variable *pnToken
|
|
|
+** to the total number of tokens in the FTS5 table. Or, if iCol is
|
|
|
+** non-negative but less than the number of columns in the table, return
|
|
|
+** the total number of tokens in column iCol, considering all rows in
|
|
|
+** the FTS5 table.
|
|
|
+**
|
|
|
+** If parameter iCol is greater than or equal to the number of columns
|
|
|
+** in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
|
|
|
+** an OOM condition or IO error), an appropriate SQLite error code is
|
|
|
+** returned.
|
|
|
+**
|
|
|
+** xColumnCount(pFts):
|
|
|
+** Return the number of columns in the table.
|
|
|
+**
|
|
|
+** xColumnSize(pFts, iCol, pnToken):
|
|
|
+** If parameter iCol is less than zero, set output variable *pnToken
|
|
|
+** to the total number of tokens in the current row. Or, if iCol is
|
|
|
+** non-negative but less than the number of columns in the table, set
|
|
|
+** *pnToken to the number of tokens in column iCol of the current row.
|
|
|
+**
|
|
|
+** If parameter iCol is greater than or equal to the number of columns
|
|
|
+** in the table, SQLITE_RANGE is returned. Or, if an error occurs (e.g.
|
|
|
+** an OOM condition or IO error), an appropriate SQLite error code is
|
|
|
+** returned.
|
|
|
+**
|
|
|
+** This function may be quite inefficient if used with an FTS5 table
|
|
|
+** created with the "columnsize=0" option.
|
|
|
+**
|
|
|
+** xColumnText:
|
|
|
+** This function attempts to retrieve the text of column iCol of the
|
|
|
+** current document. If successful, (*pz) is set to point to a buffer
|
|
|
+** containing the text in utf-8 encoding, (*pn) is set to the size in bytes
|
|
|
+** (not characters) of the buffer and SQLITE_OK is returned. Otherwise,
|
|
|
+** if an error occurs, an SQLite error code is returned and the final values
|
|
|
+** of (*pz) and (*pn) are undefined.
|
|
|
+**
|
|
|
+** xPhraseCount:
|
|
|
+** Returns the number of phrases in the current query expression.
|
|
|
+**
|
|
|
+** xPhraseSize:
|
|
|
+** Returns the number of tokens in phrase iPhrase of the query. Phrases
|
|
|
+** are numbered starting from zero.
|
|
|
+**
|
|
|
+** xInstCount:
|
|
|
+** Set *pnInst to the total number of occurrences of all phrases within
|
|
|
+** the query within the current row. Return SQLITE_OK if successful, or
|
|
|
+** an error code (i.e. SQLITE_NOMEM) if an error occurs.
|
|
|
+**
|
|
|
+** This API can be quite slow if used with an FTS5 table created with the
|
|
|
+** "detail=none" or "detail=column" option. If the FTS5 table is created
|
|
|
+** with either "detail=none" or "detail=column" and "content=" option
|
|
|
+** (i.e. if it is a contentless table), then this API always returns 0.
|
|
|
+**
|
|
|
+** xInst:
|
|
|
+** Query for the details of phrase match iIdx within the current row.
|
|
|
+** Phrase matches are numbered starting from zero, so the iIdx argument
|
|
|
+** should be greater than or equal to zero and smaller than the value
|
|
|
+** output by xInstCount().
|
|
|
+**
|
|
|
+** Usually, output parameter *piPhrase is set to the phrase number, *piCol
|
|
|
+** to the column in which it occurs and *piOff the token offset of the
|
|
|
+** first token of the phrase. Returns SQLITE_OK if successful, or an error
|
|
|
+** code (i.e. SQLITE_NOMEM) if an error occurs.
|
|
|
+**
|
|
|
+** This API can be quite slow if used with an FTS5 table created with the
|
|
|
+** "detail=none" or "detail=column" option.
|
|
|
+**
|
|
|
+** xRowid:
|
|
|
+** Returns the rowid of the current row.
|
|
|
+**
|
|
|
+** xTokenize:
|
|
|
+** Tokenize text using the tokenizer belonging to the FTS5 table.
|
|
|
+**
|
|
|
+** xQueryPhrase(pFts5, iPhrase, pUserData, xCallback):
|
|
|
+** This API function is used to query the FTS table for phrase iPhrase
|
|
|
+** of the current query. Specifically, a query equivalent to:
|
|
|
+**
|
|
|
+** ... FROM ftstable WHERE ftstable MATCH $p ORDER BY rowid
|
|
|
+**
|
|
|
+** with $p set to a phrase equivalent to the phrase iPhrase of the
|
|
|
+** current query is executed. Any column filter that applies to
|
|
|
+** phrase iPhrase of the current query is included in $p. For each
|
|
|
+** row visited, the callback function passed as the fourth argument
|
|
|
+** is invoked. The context and API objects passed to the callback
|
|
|
+** function may be used to access the properties of each matched row.
|
|
|
+** Invoking Api.xUserData() returns a copy of the pointer passed as
|
|
|
+** the third argument to pUserData.
|
|
|
+**
|
|
|
+** If the callback function returns any value other than SQLITE_OK, the
|
|
|
+** query is abandoned and the xQueryPhrase function returns immediately.
|
|
|
+** If the returned value is SQLITE_DONE, xQueryPhrase returns SQLITE_OK.
|
|
|
+** Otherwise, the error code is propagated upwards.
|
|
|
+**
|
|
|
+** If the query runs to completion without incident, SQLITE_OK is returned.
|
|
|
+** Or, if some error occurs before the query completes or is aborted by
|
|
|
+** the callback, an SQLite error code is returned.
|
|
|
+**
|
|
|
+**
|
|
|
+** xSetAuxdata(pFts5, pAux, xDelete)
|
|
|
+**
|
|
|
+** Save the pointer passed as the second argument as the extension function's
|
|
|
+** "auxiliary data". The pointer may then be retrieved by the current or any
|
|
|
+** future invocation of the same fts5 extension function made as part of
|
|
|
+** the same MATCH query using the xGetAuxdata() API.
|
|
|
+**
|
|
|
+** Each extension function is allocated a single auxiliary data slot for
|
|
|
+** each FTS query (MATCH expression). If the extension function is invoked
|
|
|
+** more than once for a single FTS query, then all invocations share a
|
|
|
+** single auxiliary data context.
|
|
|
+**
|
|
|
+** If there is already an auxiliary data pointer when this function is
|
|
|
+** invoked, then it is replaced by the new pointer. If an xDelete callback
|
|
|
+** was specified along with the original pointer, it is invoked at this
|
|
|
+** point.
|
|
|
+**
|
|
|
+** The xDelete callback, if one is specified, is also invoked on the
|
|
|
+** auxiliary data pointer after the FTS5 query has finished.
|
|
|
+**
|
|
|
+** If an error (e.g. an OOM condition) occurs within this function,
|
|
|
+** the auxiliary data is set to NULL and an error code returned. If the
|
|
|
+** xDelete parameter was not NULL, it is invoked on the auxiliary data
|
|
|
+** pointer before returning.
|
|
|
+**
|
|
|
+**
|
|
|
+** xGetAuxdata(pFts5, bClear)
|
|
|
+**
|
|
|
+** Returns the current auxiliary data pointer for the fts5 extension
|
|
|
+** function. See the xSetAuxdata() method for details.
|
|
|
+**
|
|
|
+** If the bClear argument is non-zero, then the auxiliary data is cleared
|
|
|
+** (set to NULL) before this function returns. In this case the xDelete,
|
|
|
+** if any, is not invoked.
|
|
|
+**
|
|
|
+**
|
|
|
+** xRowCount(pFts5, pnRow)
|
|
|
+**
|
|
|
+** This function is used to retrieve the total number of rows in the table.
|
|
|
+** In other words, the same value that would be returned by:
|
|
|
+**
|
|
|
+** SELECT count(*) FROM ftstable;
|
|
|
+**
|
|
|
+** xPhraseFirst()
|
|
|
+** This function is used, along with type Fts5PhraseIter and the xPhraseNext
|
|
|
+** method, to iterate through all instances of a single query phrase within
|
|
|
+** the current row. This is the same information as is accessible via the
|
|
|
+** xInstCount/xInst APIs. While the xInstCount/xInst APIs are more convenient
|
|
|
+** to use, this API may be faster under some circumstances. To iterate
|
|
|
+** through instances of phrase iPhrase, use the following code:
|
|
|
+**
|
|
|
+** Fts5PhraseIter iter;
|
|
|
+** int iCol, iOff;
|
|
|
+** for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff);
|
|
|
+** iCol>=0;
|
|
|
+** pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
|
|
|
+** ){
|
|
|
+** // An instance of phrase iPhrase at offset iOff of column iCol
|
|
|
+** }
|
|
|
+**
|
|
|
+** The Fts5PhraseIter structure is defined above. Applications should not
|
|
|
+** modify this structure directly - it should only be used as shown above
|
|
|
+** with the xPhraseFirst() and xPhraseNext() API methods (and by
|
|
|
+** xPhraseFirstColumn() and xPhraseNextColumn() as illustrated below).
|
|
|
+**
|
|
|
+** This API can be quite slow if used with an FTS5 table created with the
|
|
|
+** "detail=none" or "detail=column" option. If the FTS5 table is created
|
|
|
+** with either "detail=none" or "detail=column" and "content=" option
|
|
|
+** (i.e. if it is a contentless table), then this API always iterates
|
|
|
+** through an empty set (all calls to xPhraseFirst() set iCol to -1).
|
|
|
+**
|
|
|
+** xPhraseNext()
|
|
|
+** See xPhraseFirst above.
|
|
|
+**
|
|
|
+** xPhraseFirstColumn()
|
|
|
+** This function and xPhraseNextColumn() are similar to the xPhraseFirst()
|
|
|
+** and xPhraseNext() APIs described above. The difference is that instead
|
|
|
+** of iterating through all instances of a phrase in the current row, these
|
|
|
+** APIs are used to iterate through the set of columns in the current row
|
|
|
+** that contain one or more instances of a specified phrase. For example:
|
|
|
+**
|
|
|
+** Fts5PhraseIter iter;
|
|
|
+** int iCol;
|
|
|
+** for(pApi->xPhraseFirstColumn(pFts, iPhrase, &iter, &iCol);
|
|
|
+** iCol>=0;
|
|
|
+** pApi->xPhraseNextColumn(pFts, &iter, &iCol)
|
|
|
+** ){
|
|
|
+** // Column iCol contains at least one instance of phrase iPhrase
|
|
|
+** }
|
|
|
+**
|
|
|
+** This API can be quite slow if used with an FTS5 table created with the
|
|
|
+** "detail=none" option. If the FTS5 table is created with either
|
|
|
+** "detail=none" "content=" option (i.e. if it is a contentless table),
|
|
|
+** then this API always iterates through an empty set (all calls to
|
|
|
+** xPhraseFirstColumn() set iCol to -1).
|
|
|
+**
|
|
|
+** The information accessed using this API and its companion
|
|
|
+** xPhraseFirstColumn() may also be obtained using xPhraseFirst/xPhraseNext
|
|
|
+** (or xInst/xInstCount). The chief advantage of this API is that it is
|
|
|
+** significantly more efficient than those alternatives when used with
|
|
|
+** "detail=column" tables.
|
|
|
+**
|
|
|
+** xPhraseNextColumn()
|
|
|
+** See xPhraseFirstColumn above.
|
|
|
+*/
|
|
|
+struct Fts5ExtensionApi {
|
|
|
+ int iVersion; /* Currently always set to 3 */
|
|
|
+
|
|
|
+ void *(*xUserData)(Fts5Context*);
|
|
|
+
|
|
|
+ int (*xColumnCount)(Fts5Context*);
|
|
|
+ int (*xRowCount)(Fts5Context*, sqlite3_int64 *pnRow);
|
|
|
+ int (*xColumnTotalSize)(Fts5Context*, int iCol, sqlite3_int64 *pnToken);
|
|
|
+
|
|
|
+ int (*xTokenize)(Fts5Context*,
|
|
|
+ const char *pText, int nText, /* Text to tokenize */
|
|
|
+ void *pCtx, /* Context passed to xToken() */
|
|
|
+ int (*xToken)(void*, int, const char*, int, int, int) /* Callback */
|
|
|
+ );
|
|
|
+
|
|
|
+ int (*xPhraseCount)(Fts5Context*);
|
|
|
+ int (*xPhraseSize)(Fts5Context*, int iPhrase);
|
|
|
+
|
|
|
+ int (*xInstCount)(Fts5Context*, int *pnInst);
|
|
|
+ int (*xInst)(Fts5Context*, int iIdx, int *piPhrase, int *piCol, int *piOff);
|
|
|
+
|
|
|
+ sqlite3_int64 (*xRowid)(Fts5Context*);
|
|
|
+ int (*xColumnText)(Fts5Context*, int iCol, const char **pz, int *pn);
|
|
|
+ int (*xColumnSize)(Fts5Context*, int iCol, int *pnToken);
|
|
|
+
|
|
|
+ int (*xQueryPhrase)(Fts5Context*, int iPhrase, void *pUserData,
|
|
|
+ int(*)(const Fts5ExtensionApi*,Fts5Context*,void*)
|
|
|
+ );
|
|
|
+ int (*xSetAuxdata)(Fts5Context*, void *pAux, void(*xDelete)(void*));
|
|
|
+ void *(*xGetAuxdata)(Fts5Context*, int bClear);
|
|
|
+
|
|
|
+ int (*xPhraseFirst)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*, int*);
|
|
|
+ void (*xPhraseNext)(Fts5Context*, Fts5PhraseIter*, int *piCol, int *piOff);
|
|
|
+
|
|
|
+ int (*xPhraseFirstColumn)(Fts5Context*, int iPhrase, Fts5PhraseIter*, int*);
|
|
|
+ void (*xPhraseNextColumn)(Fts5Context*, Fts5PhraseIter*, int *piCol);
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** CUSTOM AUXILIARY FUNCTIONS
|
|
|
+*************************************************************************/
|
|
|
+
|
|
|
+/*************************************************************************
|
|
|
+** CUSTOM TOKENIZERS
|
|
|
+**
|
|
|
+** Applications may also register custom tokenizer types. A tokenizer
|
|
|
+** is registered by providing fts5 with a populated instance of the
|
|
|
+** following structure. All structure methods must be defined, setting
|
|
|
+** any member of the fts5_tokenizer struct to NULL leads to undefined
|
|
|
+** behaviour. The structure methods are expected to function as follows:
|
|
|
+**
|
|
|
+** xCreate:
|
|
|
+** This function is used to allocate and initialize a tokenizer instance.
|
|
|
+** A tokenizer instance is required to actually tokenize text.
|
|
|
+**
|
|
|
+** The first argument passed to this function is a copy of the (void*)
|
|
|
+** pointer provided by the application when the fts5_tokenizer object
|
|
|
+** was registered with FTS5 (the third argument to xCreateTokenizer()).
|
|
|
+** The second and third arguments are an array of nul-terminated strings
|
|
|
+** containing the tokenizer arguments, if any, specified following the
|
|
|
+** tokenizer name as part of the CREATE VIRTUAL TABLE statement used
|
|
|
+** to create the FTS5 table.
|
|
|
+**
|
|
|
+** The final argument is an output variable. If successful, (*ppOut)
|
|
|
+** should be set to point to the new tokenizer handle and SQLITE_OK
|
|
|
+** returned. If an error occurs, some value other than SQLITE_OK should
|
|
|
+** be returned. In this case, fts5 assumes that the final value of *ppOut
|
|
|
+** is undefined.
|
|
|
+**
|
|
|
+** xDelete:
|
|
|
+** This function is invoked to delete a tokenizer handle previously
|
|
|
+** allocated using xCreate(). Fts5 guarantees that this function will
|
|
|
+** be invoked exactly once for each successful call to xCreate().
|
|
|
+**
|
|
|
+** xTokenize:
|
|
|
+** This function is expected to tokenize the nText byte string indicated
|
|
|
+** by argument pText. pText may or may not be nul-terminated. The first
|
|
|
+** argument passed to this function is a pointer to an Fts5Tokenizer object
|
|
|
+** returned by an earlier call to xCreate().
|
|
|
+**
|
|
|
+** The second argument indicates the reason that FTS5 is requesting
|
|
|
+** tokenization of the supplied text. This is always one of the following
|
|
|
+** four values:
|
|
|
+**
|
|
|
+** <ul><li> <b>FTS5_TOKENIZE_DOCUMENT</b> - A document is being inserted into
|
|
|
+** or removed from the FTS table. The tokenizer is being invoked to
|
|
|
+** determine the set of tokens to add to (or delete from) the
|
|
|
+** FTS index.
|
|
|
+**
|
|
|
+** <li> <b>FTS5_TOKENIZE_QUERY</b> - A MATCH query is being executed
|
|
|
+** against the FTS index. The tokenizer is being called to tokenize
|
|
|
+** a bareword or quoted string specified as part of the query.
|
|
|
+**
|
|
|
+** <li> <b>(FTS5_TOKENIZE_QUERY | FTS5_TOKENIZE_PREFIX)</b> - Same as
|
|
|
+** FTS5_TOKENIZE_QUERY, except that the bareword or quoted string is
|
|
|
+** followed by a "*" character, indicating that the last token
|
|
|
+** returned by the tokenizer will be treated as a token prefix.
|
|
|
+**
|
|
|
+** <li> <b>FTS5_TOKENIZE_AUX</b> - The tokenizer is being invoked to
|
|
|
+** satisfy an fts5_api.xTokenize() request made by an auxiliary
|
|
|
+** function. Or an fts5_api.xColumnSize() request made by the same
|
|
|
+** on a columnsize=0 database.
|
|
|
+** </ul>
|
|
|
+**
|
|
|
+** For each token in the input string, the supplied callback xToken() must
|
|
|
+** be invoked. The first argument to it should be a copy of the pointer
|
|
|
+** passed as the second argument to xTokenize(). The third and fourth
|
|
|
+** arguments are a pointer to a buffer containing the token text, and the
|
|
|
+** size of the token in bytes. The 4th and 5th arguments are the byte offsets
|
|
|
+** of the first byte of and first byte immediately following the text from
|
|
|
+** which the token is derived within the input.
|
|
|
+**
|
|
|
+** The second argument passed to the xToken() callback ("tflags") should
|
|
|
+** normally be set to 0. The exception is if the tokenizer supports
|
|
|
+** synonyms. In this case see the discussion below for details.
|
|
|
+**
|
|
|
+** FTS5 assumes the xToken() callback is invoked for each token in the
|
|
|
+** order that they occur within the input text.
|
|
|
+**
|
|
|
+** If an xToken() callback returns any value other than SQLITE_OK, then
|
|
|
+** the tokenization should be abandoned and the xTokenize() method should
|
|
|
+** immediately return a copy of the xToken() return value. Or, if the
|
|
|
+** input buffer is exhausted, xTokenize() should return SQLITE_OK. Finally,
|
|
|
+** if an error occurs with the xTokenize() implementation itself, it
|
|
|
+** may abandon the tokenization and return any error code other than
|
|
|
+** SQLITE_OK or SQLITE_DONE.
|
|
|
+**
|
|
|
+** SYNONYM SUPPORT
|
|
|
+**
|
|
|
+** Custom tokenizers may also support synonyms. Consider a case in which a
|
|
|
+** user wishes to query for a phrase such as "first place". Using the
|
|
|
+** built-in tokenizers, the FTS5 query 'first + place' will match instances
|
|
|
+** of "first place" within the document set, but not alternative forms
|
|
|
+** such as "1st place". In some applications, it would be better to match
|
|
|
+** all instances of "first place" or "1st place" regardless of which form
|
|
|
+** the user specified in the MATCH query text.
|
|
|
+**
|
|
|
+** There are several ways to approach this in FTS5:
|
|
|
+**
|
|
|
+** <ol><li> By mapping all synonyms to a single token. In this case, using
|
|
|
+** the above example, this means that the tokenizer returns the
|
|
|
+** same token for inputs "first" and "1st". Say that token is in
|
|
|
+** fact "first", so that when the user inserts the document "I won
|
|
|
+** 1st place" entries are added to the index for tokens "i", "won",
|
|
|
+** "first" and "place". If the user then queries for '1st + place',
|
|
|
+** the tokenizer substitutes "first" for "1st" and the query works
|
|
|
+** as expected.
|
|
|
+**
|
|
|
+** <li> By querying the index for all synonyms of each query term
|
|
|
+** separately. In this case, when tokenizing query text, the
|
|
|
+** tokenizer may provide multiple synonyms for a single term
|
|
|
+** within the document. FTS5 then queries the index for each
|
|
|
+** synonym individually. For example, faced with the query:
|
|
|
+**
|
|
|
+** <codeblock>
|
|
|
+** ... MATCH 'first place'</codeblock>
|
|
|
+**
|
|
|
+** the tokenizer offers both "1st" and "first" as synonyms for the
|
|
|
+** first token in the MATCH query and FTS5 effectively runs a query
|
|
|
+** similar to:
|
|
|
+**
|
|
|
+** <codeblock>
|
|
|
+** ... MATCH '(first OR 1st) place'</codeblock>
|
|
|
+**
|
|
|
+** except that, for the purposes of auxiliary functions, the query
|
|
|
+** still appears to contain just two phrases - "(first OR 1st)"
|
|
|
+** being treated as a single phrase.
|
|
|
+**
|
|
|
+** <li> By adding multiple synonyms for a single term to the FTS index.
|
|
|
+** Using this method, when tokenizing document text, the tokenizer
|
|
|
+** provides multiple synonyms for each token. So that when a
|
|
|
+** document such as "I won first place" is tokenized, entries are
|
|
|
+** added to the FTS index for "i", "won", "first", "1st" and
|
|
|
+** "place".
|
|
|
+**
|
|
|
+** This way, even if the tokenizer does not provide synonyms
|
|
|
+** when tokenizing query text (it should not - to do so would be
|
|
|
+** inefficient), it doesn't matter if the user queries for
|
|
|
+** 'first + place' or '1st + place', as there are entries in the
|
|
|
+** FTS index corresponding to both forms of the first token.
|
|
|
+** </ol>
|
|
|
+**
|
|
|
+** Whether it is parsing document or query text, any call to xToken that
|
|
|
+** specifies a <i>tflags</i> argument with the FTS5_TOKEN_COLOCATED bit
|
|
|
+** is considered to supply a synonym for the previous token. For example,
|
|
|
+** when parsing the document "I won first place", a tokenizer that supports
|
|
|
+** synonyms would call xToken() 5 times, as follows:
|
|
|
+**
|
|
|
+** <codeblock>
|
|
|
+** xToken(pCtx, 0, "i", 1, 0, 1);
|
|
|
+** xToken(pCtx, 0, "won", 3, 2, 5);
|
|
|
+** xToken(pCtx, 0, "first", 5, 6, 11);
|
|
|
+** xToken(pCtx, FTS5_TOKEN_COLOCATED, "1st", 3, 6, 11);
|
|
|
+** xToken(pCtx, 0, "place", 5, 12, 17);
|
|
|
+**</codeblock>
|
|
|
+**
|
|
|
+** It is an error to specify the FTS5_TOKEN_COLOCATED flag the first time
|
|
|
+** xToken() is called. Multiple synonyms may be specified for a single token
|
|
|
+** by making multiple calls to xToken(FTS5_TOKEN_COLOCATED) in sequence.
|
|
|
+** There is no limit to the number of synonyms that may be provided for a
|
|
|
+** single token.
|
|
|
+**
|
|
|
+** In many cases, method (1) above is the best approach. It does not add
|
|
|
+** extra data to the FTS index or require FTS5 to query for multiple terms,
|
|
|
+** so it is efficient in terms of disk space and query speed. However, it
|
|
|
+** does not support prefix queries very well. If, as suggested above, the
|
|
|
+** token "first" is substituted for "1st" by the tokenizer, then the query:
|
|
|
+**
|
|
|
+** <codeblock>
|
|
|
+** ... MATCH '1s*'</codeblock>
|
|
|
+**
|
|
|
+** will not match documents that contain the token "1st" (as the tokenizer
|
|
|
+** will probably not map "1s" to any prefix of "first").
|
|
|
+**
|
|
|
+** For full prefix support, method (3) may be preferred. In this case,
|
|
|
+** because the index contains entries for both "first" and "1st", prefix
|
|
|
+** queries such as 'fi*' or '1s*' will match correctly. However, because
|
|
|
+** extra entries are added to the FTS index, this method uses more space
|
|
|
+** within the database.
|
|
|
+**
|
|
|
+** Method (2) offers a midpoint between (1) and (3). Using this method,
|
|
|
+** a query such as '1s*' will match documents that contain the literal
|
|
|
+** token "1st", but not "first" (assuming the tokenizer is not able to
|
|
|
+** provide synonyms for prefixes). However, a non-prefix query like '1st'
|
|
|
+** will match against "1st" and "first". This method does not require
|
|
|
+** extra disk space, as no extra entries are added to the FTS index.
|
|
|
+** On the other hand, it may require more CPU cycles to run MATCH queries,
|
|
|
+** as separate queries of the FTS index are required for each synonym.
|
|
|
+**
|
|
|
+** When using methods (2) or (3), it is important that the tokenizer only
|
|
|
+** provide synonyms when tokenizing document text (method (2)) or query
|
|
|
+** text (method (3)), not both. Doing so will not cause any errors, but is
|
|
|
+** inefficient.
|
|
|
+*/
|
|
|
+typedef struct Fts5Tokenizer Fts5Tokenizer;
|
|
|
+typedef struct fts5_tokenizer fts5_tokenizer;
|
|
|
+struct fts5_tokenizer {
|
|
|
+ int (*xCreate)(void*, const char **azArg, int nArg, Fts5Tokenizer **ppOut);
|
|
|
+ void (*xDelete)(Fts5Tokenizer*);
|
|
|
+ int (*xTokenize)(Fts5Tokenizer*,
|
|
|
+ void *pCtx,
|
|
|
+ int flags, /* Mask of FTS5_TOKENIZE_* flags */
|
|
|
+ const char *pText, int nText,
|
|
|
+ int (*xToken)(
|
|
|
+ void *pCtx, /* Copy of 2nd argument to xTokenize() */
|
|
|
+ int tflags, /* Mask of FTS5_TOKEN_* flags */
|
|
|
+ const char *pToken, /* Pointer to buffer containing token */
|
|
|
+ int nToken, /* Size of token in bytes */
|
|
|
+ int iStart, /* Byte offset of token within input text */
|
|
|
+ int iEnd /* Byte offset of end of token within input text */
|
|
|
+ )
|
|
|
+ );
|
|
|
+};
|
|
|
+
|
|
|
+/* Flags that may be passed as the third argument to xTokenize() */
|
|
|
+#define FTS5_TOKENIZE_QUERY 0x0001
|
|
|
+#define FTS5_TOKENIZE_PREFIX 0x0002
|
|
|
+#define FTS5_TOKENIZE_DOCUMENT 0x0004
|
|
|
+#define FTS5_TOKENIZE_AUX 0x0008
|
|
|
+
|
|
|
+/* Flags that may be passed by the tokenizer implementation back to FTS5
|
|
|
+** as the third argument to the supplied xToken callback. */
|
|
|
+#define FTS5_TOKEN_COLOCATED 0x0001 /* Same position as prev. token */
|
|
|
+
|
|
|
+/*
|
|
|
+** END OF CUSTOM TOKENIZERS
|
|
|
+*************************************************************************/
|
|
|
+
|
|
|
+/*************************************************************************
|
|
|
+** FTS5 EXTENSION REGISTRATION API
|
|
|
+*/
|
|
|
+typedef struct fts5_api fts5_api;
|
|
|
+struct fts5_api {
|
|
|
+ int iVersion; /* Currently always set to 2 */
|
|
|
+
|
|
|
+ /* Create a new tokenizer */
|
|
|
+ int (*xCreateTokenizer)(
|
|
|
+ fts5_api *pApi,
|
|
|
+ const char *zName,
|
|
|
+ void *pContext,
|
|
|
+ fts5_tokenizer *pTokenizer,
|
|
|
+ void (*xDestroy)(void*)
|
|
|
+ );
|
|
|
+
|
|
|
+ /* Find an existing tokenizer */
|
|
|
+ int (*xFindTokenizer)(
|
|
|
+ fts5_api *pApi,
|
|
|
+ const char *zName,
|
|
|
+ void **ppContext,
|
|
|
+ fts5_tokenizer *pTokenizer
|
|
|
+ );
|
|
|
+
|
|
|
+ /* Create a new auxiliary function */
|
|
|
+ int (*xCreateFunction)(
|
|
|
+ fts5_api *pApi,
|
|
|
+ const char *zName,
|
|
|
+ void *pContext,
|
|
|
+ fts5_extension_function xFunction,
|
|
|
+ void (*xDestroy)(void*)
|
|
|
+ );
|
|
|
+};
|
|
|
+
|
|
|
+/*
|
|
|
+** END OF REGISTRATION API
|
|
|
+*************************************************************************/
|
|
|
+
|
|
|
+#ifdef __cplusplus
|
|
|
+} /* end of the 'extern "C"' block */
|
|
|
+#endif
|
|
|
+
|
|
|
+#endif /* _FTS5_H */
|
|
|
+
|
|
|
+/******** End of fts5.h *********/
|
