python 用mysqldb方式操作数据库

# -*- coding: utf-8 -*-
from User import User
import time, MySQLdb

#连接
conn = MySQLdb.connect(host='localhost', user='root', passwd='root', db='test', charset='utf8')
cursor = conn.cursor()

#写入
# sql = "insert into Users values(null, %s, %s)"
# for i in range(0, 10):
#     param = ('liuruichao', 'nicai')
#     result = cursor.execute(sql, param)
#     print (result)
# conn.commit()
# cursor.close()
# conn.close()

#更新
# sql = 'update Users set username=%s where id = %s'
# param = ('buzhidao', 2)
# result = cursor.execute(sql, param)
# print (result)
# conn.commit()
# cursor.close()
# conn.close()

#删除
# sql = 'delete from Users where id = %s'
# param = (2)
# result = cursor.execute(sql, param)
# print (result)
# conn.commit()
# cursor.close()
# conn.close()


#查询
list = []
sql = 'select * from Users'
cursor.execute(sql)
rs = cursor.fetchall()
for id, username, password in rs:
    print ('id : {}, username : {}, password : {}'.format(id, username, password))
    user = User()
    user.id = id
    user.username = username
    user.password = password
    list.append(user)
cursor.close()
conn.close()
print ('总共有{}人'.format(len(list)))