DataSet ds = new DataSet();
                try
                {
                    con.Open();
                    MySqlDataAdapter adpter = new MySqlDataAdapter(SQLString, con);
                    adpter.Fill(ds);//异常了,但是它直接就报错了 TRY没有抛出。想让它异常时不直接报错,继续执行。
                }
                catch (System.Data.SqlClient.SqlException ex)
                {
                    //throw new Exception(ex.Message);
                }
                finally
                {
                    con.Close();
                }
                return ds.Tables[0];