登录数据库时，可能会忘记密码，怎么办呢？
方法：编辑mysql配置文件，不让mysql去授权；之后输入mysql无用户登录，因为是root用户，所以在mysql库里进行密码的重置
mysql密码重置过程及语句：
[root@kevin ~]# mysql -uroot
ERROR 1045 (28000): Access denied for user ‘root‘@‘localhost‘ (using password: NO)
不输入密码登录会报错
[root@kevin ~]# vim /etc/my.cnf
[mysqld]
skip-grant
在mysqld模块下添加skip-grant，不让mysql对任何用户授权
保存退出后，再重启 /etc/init.d/mysqld restart
[root@kevin ~]# mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.1.40-log MySQL Community Server (GPL)
Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
mysql> use mysql
Database changed
mysql> update user set password=password(‘123456‘) where user=‘root‘;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id: 3
Current database: mysql
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3 Changed: 3 Warnings: 0
这个时候root用户的密码就变成了123456，完事后别忘记删除配置文件里的skip-grant，再重启mysql就可以输入新密码进行登陆了
[root@kevin ~]# mysql -uroot -p123456
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.1.40-log MySQL Community Server (GPL)
Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.
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原文地址：http://kevinjin117.blog.51cto.com/11655131/1835795
