python 基础 9.9 查询数据

 

#/usr/bin/python

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

#@Time   :2017/11/24 4:21

#@Auther :liuzhenchuan

#@File   :查询数据.py

 

# 查询数据库

import codecs

 

import MySQLdb

 

select_student = '''select * from student where stdname in (select stdname from student  group by stdname having count(1)>1) order by stdname;'''

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(select_student)

        result = cus.fetchall()

        print(result)

        with codecs.open("select.txt", "w") as f:

            for line in result:

                f.write(str(line))

                f.write("\n")

        cus.close()

        cnx.commit()

    except Exception as e:

        cnx.rollback()

        raise e

    finally:

        cnx.close()