源码

 def exec_sql(self, sql):
        conn = self._get_conn()
        try:
            with conn as cur:
                cur.execute(sql)
                return cur.fetchall()
        except MySQLdb.ProgrammingError as e:
            LOG.error("execute sql ({0}) error {1}".format(sql, e))
            raise e
        except MySQLdb.OperationalError as e:
            conn = self._create_new_conn()
            raise e
        finally:
            self._put_conn(conn)

报错：AttributeError: 'Connection' object has no attribute 'execute'

类缺少方法fetchall，需要创建一个游标的实例，

from contextlib import closing
with closing(self.connectio.cursor()) as cur:

更简单的解决方法：删掉with

        try:
            cur.execute(sql)
            return cur.fetchall()

参考：https://stackoverflow.com/questions/16668623/sqlite-cursor-in-python-with-statement