namespace Model
{
public class MapperFactory
{
//聲明一個ISqlMapper接口類型的數據映射器 _mapper,其初始值為null
private static volatile ISqlMapper _mapper = null;
//private static log4net.Appender.AdoNetAppender adoApd = null;

static MapperFactory()
{
RefreshMapperSetting();
}

/// <summary>
/// 監視變化，并提供變化后的處理方法
/// </summary>
/// <param name="obj"></param>
protected static void Configure(object obj)
{
//將數據映射器初始值置空
_mapper = null;
}

/// <summary>
/// 定義InitMapper方法－用于創建sql數據映射器
/// </summary>
protected static void InitMapper()
{
RefreshMapperSetting();
}

public static void RefreshMapperSetting()
{
//調用委托ConfigureHandler，創建委托變量handler
//用于SqlMap.config改變后的處理方法
ConfigureHandler handler = new ConfigureHandler(Configure);

//新建一個DomSqlMapBuilder類的實例builder
//此變量用于配置和監視SqlMap.config的變化
DomSqlMapBuilder builder = new DomSqlMapBuilder();

//加入程序中自定義的鍵值對
//你可以在配置監視之前加上自己的一些鍵值對內容
NameValueCollection nvcProperties = new NameValueCollection();

nvcProperties.Add("DataSource", "PACTERA_GZF-PC");
nvcProperties.Add("DataBase", "TestOne");
nvcProperties.Add("UserName", "sa");
nvcProperties.Add("Password", "sa");
nvcProperties.Add("Timeout", "60");
builder.Properties = nvcProperties;

//啟用在配置之前的檢查
builder.ValidateSqlMapConfig = true;

//使用builder的ConfigureAndWatch生成一個ISqlMapper類型的數據映射器
_mapper = builder.ConfigureAndWatch("SqlMap.config", handler);

}

/// <summary>
/// 定義一個返回值為接口類型的方法Instance，用于實現sqlMapper實例化
/// </summary>
/// <returns></returns>
public static ISqlMapper Instance()
{
if (_mapper == null)
{
lock (typeof(SqlMapper))
{
if (_mapper == null) // double-check
{
//引用InitMapper，創建sqlMapper實例
InitMapper();
}
}
}

return _mapper;
}

/// <summary>
/// 定義一個Get方法，返回_mapper
/// </summary>
/// <returns></returns>
public static ISqlMapper Get()
{
return Instance();
}
}
}

Ibatis ISqlMapper工廠類案例