protected override IDbTransaction BeginTransaction()
{
//只要找到一个当前数据库的连接管理对象，直到发生 Dispose 前，
//这个连接都一直不会被关闭，那么代码块中的数据访问方法都是使用同一个打开的连接。
//这样就不会升级为分布式事务。
_conMgr = TransactionDependentConnectionManager.GetManager(this.DbSetting);
return(_conMgr.Connection.BeginTransaction(this.IsolationLevel));
}
internal ManagedConnectionDbAccesser(DbSetting dbSetting)
{
if (dbSetting == null)
{
throw new ArgumentNullException("dbSetting");
}
_connectionManager = TransactionDependentConnectionManager.GetManager(dbSetting);
_dba = new DbAccesser(dbSetting, _connectionManager.Connection);
}
public static TransactionDependentConnectionManager GetManager(DbSetting dbSetting)
{
var res = new TransactionDependentConnectionManager();
res._block = LocalTransactionBlock.GetWholeScope(dbSetting.Database);
if (res._block != null)
{
res._connection = res._block.WholeTransaction.Connection;
}
else
{
//没有定义事务范围时，无需共享连接。
res._connection = dbSetting.CreateConnection();
res._connection.Open();
}
res._dbSetting = dbSetting;
return(res);
}
public static TransactionDependentConnectionManager GetManager(DbSetting dbSetting)
{
var res = new TransactionDependentConnectionManager();
res._block = LocalTransactionBlock.GetWholeScope(dbSetting.Database);
if (res._block != null)
{
res._connection = res._block.WholeTransaction.Connection;
}
else
{
//没有定义事务范围时，无需共享连接。
res._connection = dbSetting.CreateConnection();
res._connection.Open();
}
res._dbSetting = dbSetting;
return res;
}
