lyfz_repos/经典版源码/document/动软模板/工厂模式模板/DALFactory.cmt

<#@ template language="c#" HostSpecific="True" #>
<#@ output extension= ".cs" #>
<#
	TableHost host = (TableHost)(Host);		
	string ModelSpace = host.NameSpace+".Model."+ host.GetModelClass(host.TableName);
	ColumnInfo identityKey=host.IdentityKey;
	string returnValue = "void";
    if (identityKey!=null)
    {         
         returnValue = CodeCommon.DbTypeToCS(identityKey.TypeName);              
    }
#>
using System;
using System.Reflection;
using System.Configuration;
using Maticsoft.IDAL;
namespace <#= host.NameSpace #>.DALFactory
{
	/// <summary>
	/// 如果在这里创建对象报错，请检查web.config里是否修改了<add key="DAL" value="Maticsoft.SQLServerDAL" />。
	/// </summary>
	public sealed partial class DataAccess
	{
        private static readonly string AssemblyPath = ConfigurationManager.AppSettings["DAL"];        
		public DataAccess()
		{ }

        #region CreateObject 

		//不使用缓存
        private static object CreateObjectNoCache(string AssemblyPath,string classNamespace)
		{		
			try
			{
				object objType = Assembly.Load(AssemblyPath).CreateInstance(classNamespace);	
				return objType;
			}
			catch//(System.Exception ex)
			{
				//string str=ex.Message;// 记录错误日志
				return null;
			}			
			
        }
		//使用缓存
		private static object CreateObject(string AssemblyPath,string classNamespace)
		{			
			object objType = DataCache.GetCache(classNamespace);
			if (objType == null)
			{
				try
				{
					objType = Assembly.Load(AssemblyPath).CreateInstance(classNamespace);					
					DataCache.SetCache(classNamespace, objType);// 写入缓存
				}
				catch//(System.Exception ex)
				{
					//string str=ex.Message;// 记录错误日志
				}
			}
			return objType;
		}
        #endregion

        #region Create<#= host.GetDALClass(host.TableName) #>
        public static <#= host.NameSpace #>.IDAL.I<#= host.GetDALClass(host.TableName) #> Create<#= host.GetDALClass(host.TableName) #>()
		{
			//方式1			
			//return (<#= host.NameSpace #>.IDAL.I<#= host.GetDALClass(host.TableName) #>)Assembly.Load(AssemblyPath).CreateInstance(AssemblyPath+".<#= host.GetDALClass(host.TableName) #>");

			//方式2 			
			string classNamespace = AssemblyPath+".<#= host.GetDALClass(host.TableName) #>";	
			object objType=CreateObject(AssemblyPath,classNamespace);
            return (<#= host.NameSpace #>.IDAL.I<#= host.GetDALClass(host.TableName) #>)objType;		
		}
		#endregion
             
        
    }
}