错误！Object reference not set to an instance of an object.
MySql.Data
   at MySql.Data.MySqlClient.MySqlConnection.get_ServerThread()
   at MySql.Data.MySqlClient.MySqlConnection.HandleTimeoutOrThreadAbort(Exception ex)
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
   at Weed.SDQ.SqlRun.ExeReader(DbCommand cmd, CommandBehavior rowBehavior, QDbTran qTran)