/// <summary>
/// 开始事务，并返回事务对象
/// </summary>
public ComTransaction BeginTransaction()
{
trans = this._dbconn.BeginTransaction();
return(trans);
}
public ComCommand(string cmdText, ComConnection con, ComTransaction trans)
{
_cmd = new System.Data.OracleClient.OracleCommand(cmdText, con.Connection, trans.Transaction);
}