public static DefaultConnectionDB GetInstance()
{
//如果没有HttpContext使用标准单例
if (HttpContext.Current == null)
{
if (_instance == null)
{
lock (Locker)
{
//double check
if (_instance == null)
{
_instance = new DefaultConnectionDB();
}
}
}
return _instance;
}
//如果在web环境中每个请求对应一个实例
if (!HttpContext.Current.Items.Contains(typeof(DefaultConnectionDB)))
{
HttpContext.Current.Items.Add(typeof(DefaultConnectionDB), new DefaultConnectionDB());
}
return (DefaultConnectionDB)HttpContext.Current.Items[typeof(DefaultConnectionDB)];
//if (_instance != null)
// return _instance;
//if (Factory != null)
// return Factory.GetInstance();
//else
//{
// _instance = new DefaultConnectionDB();
// return _instance;
//}
}
public override void OnEndTransaction()
{
if (_instance == this)
_instance = null;
}
public override void OnBeginTransaction()
{
if (_instance == null)
_instance = this;
}