MySQL（asp.net） 事务

 try
        {
            string _conStr = "Driver={MySQL ODBC 3.51
Driver};server=localhost;database=test;uid=test;password=1;option=3";
            OdbcConnection _odbcCon = new OdbcConnection(_conStr);
            _odbcCon.Open();
            OdbcTransaction trans = _odbcCon.BeginTransaction
(IsolationLevel.ReadCommitted);
            OdbcCommand cmd = new OdbcCommand();
            cmd.Connection = trans.Connection;
            cmd.Transaction = trans;
            string _sqlStr = "";
          
            try
            {
                _sqlStr = "update  test ....."
              
                cmd.CommandText = _sqlStr;
                cmd.ExecuteNonQuery();
                _sqlStr = "";
            }
            catch
            {
      &n