首先，创建mysql用户users表

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create table users (

id int NOT NULL primary key auto_increment,

username varchar(16) NOT NULL,

passwd varchar(32) NOT NULL

) ENGINE=MyISAM DEFAULT CHARSET=utf8;

看下表结构：

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mysql> desc users;

+----------+-------------+------+-----+---------+----------------+

| Field    | Type        | Null | Key | Default | Extra          |

+----------+-------------+------+-----+---------+----------------+

| id       | int(11)     | NO   | PRI | NULL    | auto_increment |

| username | varchar(16) | NO   |     | NULL    |                |

| passwd   | varchar(32) | NO   |     | NULL    |                |

+----------+-------------+------+-----+---------+----------------+

3 rows in set (0.02 sec)

接下来，插入测试数据，passwd字段用md5()加密保存

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insert into users(username,passwd)

values

('zl', md5('zl')),

('zhangliang', md5('zhangliang')),

('root', md5('zl9053')),

('test', md5('test')),

('admin', md5('admin'));

查询一下刚刚插入的几条数据：

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mysql> select * from users;

+----+------------+----------------------------------+

| id | username   | passwd                           |

+----+------------+----------------------------------+

|  1 | zl         | c28cbd398a61e9022fd6a6835a57dc50 |

|  2 | zhangliang | 1be558d6077347baaed6d4464495b360 |

|  3 | root       | bad149ab36b0887d21f1af59b544abba |

|  4 | test       | 098f6bcd4621d373cade4e832627b4f6 |

|  5 | admin      | 21232f297a57a5a743894a0e4a801fc3 |

+----+------------+----------------------------------+

5 rows in set (0.00 sec)

上代码：

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#!/usr/bin/env python

# -*- coding:UTF-8 -*-

# Filename: user_auth.py

# Author: zhangliang - z_liang90@126.com

# Last modified: 2014-02-27 14:52

# Description:

import hashlib

import MySQLdb as mysqldb

import datetime

from getpass import getpass

from sys import exit

_username = raw_input('Enter username:').strip()

if not _username:

print u'用户名不允许为空！'

exit()

try:

#connect db

conn = mysqldb.connect(host='localhost', user='root', passwd='123456', port=3306, charset='utf8')

#select db

conn.select_db('python')

#create a cursor instance

cur = conn.cursor()

#if user exists, reutrn 1

user_sql = "select 1 from users where username = '%s'" % _username

result = cur.execute(user_sql)

#user password auth

if result:

_password = getpass('Password:').strip()

if not _password:

print u'密码不允许为空！'

else:

#将用户输出的密码转换成md5

e = hashlib.md5()

e.update(_password)

_pwd = e.hexdigest()

pwd_sql = "select passwd from users where username = '%s'" % _username

cur.execute(pwd_sql)

ret_pwd = cur.fetchone()[0]

if ret_pwd == _pwd:

print u'%s, 认证成功！ [ 登陆时间：%s ] ' % (_username, datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'))

else:

print u'密码不正确！'

else:

print u'用户名不存在！'

#close cursor, conn

cur.close()

conn.close()

except (mysqldb.MySQLError, Exception), e:

print 'Error: %s' % e

执行下程序，看看效果：

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]# python user_auth.py

Enter username:root

Password:

root, 认证成功！ [ 登陆时间：2014-02-28 14:53:14 ]

]# python user_auth.py

Enter username:ad

用户名不存在！

]# python user_auth.py

Enter username:admin

Password:

密码不允许为空！

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