//查詢基本資料        private static void TestQry()        {            DataTable dtReturn =new DataTable();            //查詢基礎資料            try            {                //模擬查詢原始資料                string strSql1 = @"Select id,name from databasename@dblinkname:tablenameunionSelect id,name from databasename@dblinkname:tablenameinto temp tmp_tablename with no log;";                string strSql2 = @"select * from tmp_tablename;";                string strSql3 = @"drop table tmp_tablename;";                using (IfxConnection conn = new IfxConnection(gsConnStr))                {                    using (IfxCommand cmd = new IfxCommand(strSql1, conn))                    {                        conn.Open();                        //                        cmd.CommandType = CommandType.Text;                        cmd.CommandText = strSql1;                        cmd.ExecuteNonQuery();                        using (IfxDataAdapter ad = new IfxDataAdapter(strSql2, conn))                        {                            ad.Fill(dtReturn);                        }                        cmd.CommandType = CommandType.Text;                        cmd.CommandText = strSql3;                        cmd.ExecuteNonQuery();                        conn.Close();                    }                }            }            catch (Exception ex)            {                dtReturn = null;                Console.WriteLine(ex.Message);            }        }