MySQL修改root账号密码

leehunter

MySQL数据库中如何修改root用户的密码呢？下面总结了修改root用户密码的一些方法

1： 使用set password语句修改

1. mysql> select user();
   
2. +----------------+
   
3. | user()         |
   
4. +----------------+
   
5. | root@localhost |
   
6. +----------------+
   
7. 1 row in set (0.08 sec)
   
8. 
   
9. mysql> set password=password('123456');
   
10. Query OK, 0 rows affected (0.00 sec)
    
11. 
    
12. mysql> flush privileges;
    
13. Query OK, 0 rows affected (0.00 sec)
    
14. 
    
15. mysql> exit

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2: 更新mysql数据库的user表

1. mysql> use mysql;
   
2. Reading table information for completion of table and column names
   
3. You can turn off this feature to get a quicker startup with -A
   
4. 
   
5. Database changed
   
6. mysql> update user set password=PASSWORD('QwE123') where user='root';
   
7. Query OK, 4 rows affected (0.03 sec)
   
8. Rows matched: 4  Changed: 4  Warnings: 0
   
9. 
   
10. mysql> flush privileges;
    
11. Query OK, 0 rows affected (0.00 sec)
    
12. 
    
13. mysql> quit

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3：使用mysqladmin命令修改

命令一般为 mysqladmin -u root -p'oldpassword' password newpass 如下所示：

1. [root@DB-Server ~]# mysqladmin -u root  -p'123456' password 'Qwe123'
   
2. Warning: Using a password on the command line interface can be insecure.

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验证root密码修改是否成功

1. [root@DB-Server ~]# mysql -u root -p'Qwe123' -e 'show databases';
   
2. Warning: Using a password on the command line interface can be insecure.
   
3. +--------------------+
   
4. | Database           |
   
5. +--------------------+
   
6. | information_schema |
   
7. | mysql              |
   
8. | performance_schema |
   
9. | test               |
   
10. +--------------------+

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上面都是在知道root密码的情况下修改root密码，如果忘记了root密码，如何修改root的密码呢？

1：首先停掉MySQL服务

1. [root@DB-Server ~]# service mysql stop
   
2. Shutting down MySQL..[  OK  ]
   
3. [root@DB-Server ~]#
   
4. 
   
5. 或
   
6. 
   
7. [root@DB-Server ~]# /etc/rc.d/init.d/mysql stop
   
8. Shutting down MySQL..[  OK  ]

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2：然后使用mysqld_safe命令启动mysql，更新root账号的密码

    --skip-grant-tables：不启动grant-tables(授权表),跳过权限控制。

    --skip-networking ：跳过TCP/IP协议，只在本机访问(这个选项不是必须的。可以不用)是可以不用

1. [root@DB-Server ~]# mysqld_safe --user=mysql --skip-grant-tables --skip-networking &
   
2. [1] 5145
   
3. You have new mail in /var/spool/mail/root
   
4. [root@DB-Server ~]# 150709 14:10:53 mysqld_safe Logging to '/var/lib/mysql/DB-Server.localdomain.err'.
   
5. 150709 14:10:53 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
   
6. 
   
7. [root@DB-Server ~]# mysql -u root  mysql
   
8. Reading table information for completion of table and column names
   
9. You can turn off this feature to get a quicker startup with -A
   
10. 
    
11. Welcome to the MySQL monitor.  Commands end with ; or \g.
    
12. Your MySQL connection id is 1
    
13. Server version: 5.6.20-enterprise-commercial-advanced MySQL Enterprise Server - Advanced Edition (Commercial)
    
14. 
    
15. Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
    
16. 
    
17. Oracle is a registered trademark of Oracle Corporation and/or its
    
18. affiliates. Other names may be trademarks of their respective
    
19. owners.
    
20. 
    
21. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
    
22. 
    
23. mysql> show databases;
    
24. +--------------------+
    
25. | Database           |
    
26. +--------------------+
    
27. | information_schema |
    
28. | mysql              |
    
29. | performance_schema |
    
30. | test               |
    
31. +--------------------+
    
32. 4 rows in set (0.00 sec)
    
33. 
    
34. mysql> use mysql
    
35. Database changed
    
36. mysql> UPDATE user SET password=PASSWORD("Qwe123") WHERE user='root';
    
37. Query OK, 4 rows affected (0.01 sec)
    
38. Rows matched: 4  Changed: 4  Warnings: 0
    
39. 
    
40. mysql> flush privileges;
    
41. Query OK, 0 rows affected (0.00 sec)
    
42. 
    
43. mysql> exit
    
44. Bye

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3：重新启动MySQL服务。


作者：潇湘隐者
出处：http://www.cnblogs.com/kerrycode/

renxiao2003

条条大路通罗马，方法很多种。