try:
            self.connect_dbserver()
            self.cursor.execute(sql)
            res = self.cursor.fetchall()  # 返回的是数组的类型
            print(type(res))
            print(res)
            # 查出当前查询的列名，保存到coloums
            coloums = [column[0] for column in self.cursor.description]
            # 定义一个数组，用来保存每一组的数组，格式为字典形式{"name":"database","age":18}
            sub_resdata = []
            for row in res:
                print(row)
                # res(1,2,3,4)是数组类型将每行的结果和列名压缩在一起，并转换为字典
                res_data = dict(zip(coloums, row))
                sub_resdata.append(res_data)
        except Exception as e:
            mylog.exception("查询数据出错，请检查{0}".format(e))
        finally:
            self.close_cursor()
        return sub_resdata