python delete数据

• Z时代
• 2024-01-10
• 分类：综合

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# @Time   : 2017/11/24 0:27
# @Author : lijunjiang
# @File   : delete.py
import MySQLdb
select_sql = '''
    SELECT TID FROM (
        (
            SELECT Score.CouID, Course.TID, Teacher.TName, COUNT(Course.TID) as teacher_count FROM Score
            JOIN Course ON Score.CouID = Course.CouID and Score.Grade < 60
            JOIN Teacher ON Course.TID = Teacher.TID
            GROUP BY Course.TID
            ORDER by teacher_count DESC
            LIMIT 5
        ) 
        as teacher_tid
    )
'''
delete_sql = '''
    delete from Teacher where TID in (
        SELECT TID FROM (
            (
                SELECT Score.CouID, Course.TID, Teacher.TName, COUNT(Course.TID) as teacher_count FROM Score
                JOIN Course ON Score.CouID = Course.CouID and Score.Grade < 60
                JOIN Teacher ON Course.TID = Teacher.TID
                GROUP BY Course.TID
                ORDER by teacher_count DESC
                LIMIT 5
            ) 
            as teacher_tid
            )
    )
'''
def connect_mysql():
    info_mysql = {
        'host': '11.11.11.11',
        'port': 3306,
        'db': 'python',
        # 'charset':'utf8',
        'user': 'python',
        'passwd': 'python'
    }
    try:
        cnx = MySQLdb.connect(**info_mysql)
    except Exception as err:
        raise err
    return cnx
if __name__ == '__main__':
    cnx = connect_mysql()
    try:
        cus = cnx.cursor()
        cus.execute(select_sql)
        result = cus.fetchall()
        print(result)
        cus.execute(delete_sql)
        cus.execute(select_sql)
        result1 = cus.fetchall()
        print(result1)
        cus.close()
        cnx.commit()
    except Exception as err:
        cnx.rollback()
        raise err
    finally:
        cnx.close()

运行结果：

C:\Python27\python.exe D:/Python/Mysql/delete.py
((10L,), (4L,), (3L,), (1L,), (9L,))
((8L,), (7L,), (5L,), (6L,))
Process finished with exit code 0

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