mysql有时候忘记密码了怎么办?我给出案例和说明!一下就解决了!
Windows下的实际操作如下
1.关闭正在运行的MySQL。
2.打开DOS窗口，转到mysql\bin目录。
3.输入mysqld --skip-grant-tables回车。如果没有出现提示信息，那就对了。
4.再开一个DOS窗口(因为刚才那个DOS窗口已经不能动了)，转到mysql\bin目录。
5.输入mysql回车，如果成功，将出现MySQL提示符 >
6. 连接权限数据库>use mysql; (>是本来就有的提示符,别忘了最后的分号)
6.改密码：> update user set password=password("520") where user="root"; (别忘了最后的分号)
7.刷新权限(必须的步骤)>flush privileges;
8.退出 > \q
9.注销系统，再进入，开MySQL，使用用户名root和刚才设置的新密码123456登陆。
例子：
第一步
C:\Documents and Settings\Administrator>cd D:\web\www.php100.com\Mysql\MySQL Se
rver5.5\bin
C:\Documents and Settings\Administrator>d:
D:\web\www.php100.com\Mysql\MySQL Server5.5\bin>mysqld --skip-grant-tables
第二步
Microsoft Windows [版本 5.2.3790]
(C) 版权所有 1985-2003 Microsoft Corp.
C:\Documents and Settings\Administrator>cd D:\web\www.php100.com\Mysql\MySQL Se
rver5.5\bin
C:\Documents and Settings\Administrator>d:
D:\web\www.php100.com\Mysql\MySQL Server5.5\bin>mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 1
Server version: 5.5.10 MySQL Community Server (GPL)
Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
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("520") where user="root";
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> \q
Bye
D:\web\www.php100.com\Mysql\MySQL Server5.5\bin>