#ifndef __ODBC_POOL_20151016__
#define __ODBC_POOL_20151016__

#pragma once

#include "ODBCConnect.h"

class CODBCPool
{
public:
	CODBCPool(void);
	~CODBCPool(void);

	// 获取实例指针;
	static CODBCPool* GetInstance();

	// 初始化所有连接;
	DWORD InitializePool( IN LPCTSTR lpDBSource, IN CONST DWORD &dwDBPort, IN LPCTSTR lpDBAccount, IN LPCTSTR lpPassWord, IN LPCTSTR lpDBName, IN CONST INT &nMinConn = 1, IN CONST INT &nMaxConn = 5);
	// 关闭所有连接;
	void ReleasePool(){DestroyAllDBConnections();}

	// 设置数据库信息;
	void SetDBConnectionInfo(IN LPCTSTR lpDBSource, IN CONST DWORD &dwDBPort, IN LPCTSTR lpDBAccount, IN LPCTSTR lpPassWord, IN LPCTSTR lpDBName);
	// 初始化所有连接;
	INT IntiAllConnections();
	// 断开所有连接;
	void DestroyAllDBConnections();

	// 获取一个空闲连接;
	CODBCConnect* GetAConnection( IN CONST DWORD &dwTimeOut = 1000 );
	// 交还连接给空闲队列;
	INT RestoreAConnection(IN CODBCConnect *pDBConn);

private:
	volatile LONG m_nRef;
	volatile LONG m_nObjRef;
	// 创建一个连接;
	INT InitAConnection();
	// 关闭一个连接;
	void CloseAConnection(CODBCConnect* pDBEngine);
	// 停止工作者线程;
	void StopWorkThread();
	// 判断是否需要停止工作;
	BOOL IsNeedStop();
	// 判断是否需要连接;
	BOOL IsNeedConnection();
	
	// 将守卫类友元化;
	friend class ODBCConnGuard;

	// 单例实例;
	static CODBCPool* m_pInstance;

	// 空闲数据库连接池;
	ODBCConnectList m_listIdleConnections;
	// 在使用的数据库连接池;
	ODBCConnectList m_listBusyConnections;

	// 保护连接池的临界区
	CRITICAL_SECTION m_csIdleConnList;
	CRITICAL_SECTION m_csBusyConnList;

	// 可用的指标：最大、最小;
	INT m_nMaxCount;
	INT m_nMinCount;

	// 引入的指针变量;
	LPCTSTR m_lpDBSource;
	DWORD m_dwDBPort;
	LPCTSTR m_lpDBAccount;
	LPCTSTR m_lpPassWord;
	LPCTSTR m_lpDBName;

	// 维护线程;
	HANDLE m_hWorkThread;
	HANDLE m_hHaveData;

	BOOL m_bNeedExit;	// 退出数据池;
	BOOL m_bNeedStop;
	BOOL m_bNeedConnection;
	static DWORD WINAPI WorkThread( IN LPVOID lpInput );

public:
	BOOL GetSelectby(IN LPCTSTR lpTblName, IN LPCTSTR lpColumn, IN LPCTSTR lpFilters, OUT LPTSTR lpResult, IN CONST INT& nBufLen, IN CONST DWORD &dwTimeOut = 3000 );
	//////////////////////////////////////////////////////////////////////////
	// 数据库接口;
	BOOL ExecuteSQL( IN LPCTSTR lpExcuteSQL, IN CONST DWORD &dwTimeOut = 30000 );
	INT GetTblRecordCount( IN LPCTSTR lpTblName, IN LPCTSTR lpFilters, IN CONST DWORD &dwTimeOut = 30000 );

	//////////////////////////////////////////////////////////////////////////
	// 公司域名接收后台;
	BOOL GetunauthInfo( IN LPCTSTR lpSQLFilters, OUT LPTSTR lpUnauthInfo, IN CONST DWORD &dwTimeOut = 30000 );
	BOOL GetunauthInfo( IN LPCTSTR lpSQLFilters, OUT TString &strUnauthInfo, IN CONST DWORD &dwTimeOut = 30000 );
	INT GetClientEnterpriseName( IN LPCTSTR lpSQLFilters, OUT LPVOID lpClientIPInfo, IN CONST DWORD &dwTimeOut = 30000  );
	INT GetEnterprisInfo(IN LPCTSTR lpEnterpriseName, OUT CArray<CStringArray, CStringArray>& AryEnterpriseInfo, IN CONST DWORD &dwTimeOut = 30000);
	BOOL GetDBCFileInfo(IN LPCTSTR lpSQL, OUT TString& strResult, IN CONST DWORD &dwTimeOut = 3000);

	BOOL GetVersionInfo( OUT LPVOID lpVerInfo, IN CONST DWORD &dwTimeOut = 30000 );
	BOOL GetNetShareInfo( OUT LPVOID lpNetShareInfo, IN CONST DWORD &dwTimeOut = 30000 );
	BOOL GetOrderInfo( OUT LPVOID lpOrderInfo, IN CONST DWORD &dwTimeOut = 30000 );
	BOOL GetTookOrderInfo( OUT LPVOID lpTookOrderInfo, IN CONST DWORD &dwTimeOut = 3000 );

};

// ODBC守卫垫片类;
class ODBCConnGuard
{
	CODBCConnect *m_pODBCConn;
public:
	ODBCConnGuard( CODBCConnect *&pDBConn, CONST DWORD &dwTimeOut = 30000 )
	{
		pDBConn = CODBCPool::GetInstance()->GetAConnection( dwTimeOut );
		m_pODBCConn = pDBConn;
	}

	virtual ~ODBCConnGuard()
	{
		CODBCPool::GetInstance()->RestoreAConnection(m_pODBCConn);
	}
};

#endif