Mysql用户管理相关知识介绍

当前使用的user及host:

mysql> select USER(); +----------------+ | USER()         | +----------------+ | root@localhost | +----------------+ 1 row in set (0.00 sec)

添加用户

mysql5以前版本直接使用 INSERT 向 mysql 表中插入mysql用户了,mysql5之后不可以这样操作

mysql> insert into mysql.user(Host,User,Password) values('localhost','test_user',password('123123')); ERROR 1062 (23000): Duplicate entry 'localhost-test_user' for key 'PRIMARY'

增加用户 {授予用户指定数据表权限 [使用 GRANT 命令 对用户进行相应授权]}

mysql> GRANT all privileges ON table1.* TO  'test_user'@'localhost' IDENTIFIED BY '123123' WITH GRANT OPTION; Query OK, 0 rows affected (0.02 sec)

IDENTIFIED BY 指定用户的登录密码

ALL PRIVILEGES 是表示所有权限，也可以使用 select、update 等权限

*. 中前面的*号用来指定数据库名，后面的*号用来指定表名

TO 表示将权限赋予某个用户

ON 用来指定权限针对哪些库和表

'test_user'@'localhost' 表示test_user用户，@后面接限制的主机，可以是IP、IP段、域名以及%，%表示任何地方

WITH GRANT OPTION 这个选项表示该用户可以将自己拥有的权限授权给别人

需要刷新系统权限表[flush privilege] 该用户才能生效登录

mysql> flush privileges;

删除用户

mysql> drop user 'test_user'@'localhost';

查看当前用户的权限

mysql> SHOW GRANTS; +----------------------------------------------------------------------------------------------------------------------------------------+ | Grants for root@localhost                                                                                                              | +----------------------------------------------------------------------------------------------------------------------------------------+ | GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*E56A114692FE0DE073F9A1DD68A00EEB9703F3F1' WITH GRANT OPTION | | GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION                                                                           | +----------------------------------------------------------------------------------------------------------------------------------------+

查看某个用户的权限

mysql> show grants for 'test_user'@'localhost' +------------------------------------------------------------------------------------------------------------+ | Grants for test_user@localhost                                                                                   | +------------------------------------------------------------------------------------------------------------+ | GRANT USAGE ON *.* TO 'test_user'@'localhost' IDENTIFIED BY PASSWORD '*E56A114692FE0DE073F9A1DD68A00EEB9703F3F1' | | GRANT ALL PRIVILEGES ON table1.* TO 'test_user'@'localhost' WITH GRANT OPTION                                 | +------------------------------------------------------------------------------------------------------------+

对账户重命名

mysql> rename user 'test_user'@'localhost' to 'bb'@'localhost';

修改密码

1.用set password命令

mysql> SET PASSWORD FOR 'test_user'@'localhost' = PASSWORD('123456');

2.用 mysqladmin [进入bin目录]

备注:{格式: mysqladmin -u用户名 -p旧密码 password 新密码]

/usr/bin$ mysqladmin -utest_user -p123456 password 123123 mysqladmin: Can't turn off logging; error: 'Access denied; you need (at least one of) the SUPER privilege(s) for this operation'

3.用 update 直接编辑 user 表

mysql> use mysql Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> update user set PASSWORD = PASSWORD('123123') where user = 'test_user'; Query OK, 1 row affected (0.04 sec) Rows matched: 1  Changed: 1  Warnings: 0

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