python 基础 9.10 删除数据

 

#/usr/bin/python

#-*- coding:utf-8 -*-

#@Time   :2017/11/24 4:40

#@Auther :liuzhenchuan

#@File   :删除数据.py

 

#!/usr/bin/env python

# -*- coding:utf-8 -*-

# @Time    : 2017/9/23 16:42

# @Author  : lingxiangxiang

# @File    : demon10.py

import MySQLdb

 

sql = '''delete from teacher WHERE tid in (select tid from ((select score.couid, course.tid, score.grade, count(course.tid) as count_teacher from score join course on course.couid = score.couid and score.grade <60 join teacher on teacher.tid = course.tid GROUP BY course.tid ORDER BY count_teacher DESC LIMIT 5) as tid_test));'''

 

def connect_mysql():

    db_config = {

        "host": "192.168.16.70",

        "port": 3306,

        "user": "root",

        "passwd": "123123",

        "db": "students",

        "charset": "utf8"

    }

    try:

        cnx = MySQLdb.connect(**db_config)

    except Exception as e:

        raise e

    return cnx

 

if __name__ == "__main__":

    cnx = connect_mysql()

    cus = cnx.cursor()

    try:

        cus.execute(sql)

        cus.close()

        cnx.commit()

    except Exception as e:

        cnx.rollback()

        raise e

    finally:

        cnx.close()