namespace Model
{
public class MapperFactory
{
//聲明一個(gè)ISqlMapper接口類型的數(shù)據(jù)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(jiān)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(shù)據(jù)映射器初始值置空
_mapper = null;
}

/// <summary>
/// 定義InitMapper方法－用于創(chuàng)建sql數(shù)據(jù)映射器
/// </summary>
protected static void InitMapper()
{
RefreshMapperSetting();
}

public static void RefreshMapperSetting()
{
//調(diào)用委托ConfigureHandler，創(chuàng)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(gè)DomSqlMapBuilder類的實(shí)例builder
//此變量用于配置和監(jiān)視SqlMap.config的變化
DomSqlMapBuilder builder = new DomSqlMapBuilder();

//加入程序中自定義的鍵值對(duì)
//你可以在配置監(jiān)視之前加上自己的一些鍵值對(duì)內(nèi)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(gè)ISqlMapper類型的數(shù)據(jù)映射器
_mapper = builder.ConfigureAndWatch("SqlMap.config", handler);

}

/// <summary>
/// 定義一個(gè)返回值為接口類型的方法Instance，用于實(shí)現(xiàn)sqlMapper實(shí)例化
/// </summary>
/// <returns></returns>
public static ISqlMapper Instance()
{
if (_mapper == null)
{
lock (typeof(SqlMapper))
{
if (_mapper == null) // double-check
{
//引用InitMapper，創(chuàng)建sqlMapper實(shí)例
InitMapper();
}
}
}

return _mapper;
}

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

Ibatis ISqlMapper工廠類案例