Home Database Mysql Tutorial MySQL中基本的用户和权限管理方法小结_MySQL

MySQL中基本的用户和权限管理方法小结_MySQL

Jun 01, 2016 pm 12:59 PM
mysql Permissions user

MySQL 默认有个root用户,但是这个用户权限太大,一般只在管理数据库时候才用。如果在项目中要连接 MySQL 数据库,则建议新建一个权限较小的用户来连接。

在 MySQL 命令行模式下输入如下命令可以为 MySQL 创建一个新用户:

CREATE USER username IDENTIFIED BY 'password';

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新用户创建完成,但是此刻如果以此用户登陆的话,会报错,因为我们还没有为这个用户分配相应权限,分配权限的命令如下:

GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost' IDENTIFIED BY 'password';

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授予username用户在所有数据库上的所有权限。

如果此时发现刚刚给的权限太大了,如果我们只是想授予它在某个数据库上的权限,那么需要切换到root 用户撤销刚才的权限,重新授权:

EVOKE ALL PRIVILEGES ON *.* FROM 'username'@'localhost';
GRANT ALL PRIVILEGES ON wordpress.* TO 'username'@'localhost' IDENTIFIED BY 'password';

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甚至还可以指定该用户只能执行 select 和 update 命令:

GRANT SELECT, UPDATE ON wordpress.* TO 'username'@'localhost' IDENTIFIED BY 'password';

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这样一来,再次以username登陆 MySQL,只有wordpress数据库是对其可见的,并且如果你只授权它select权限,那么它就不能执行delete 语句。

另外每当调整权限后,通常需要执行以下语句刷新权限:

FLUSH PRIVILEGES;

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删除刚才创建的用户:

DROP USER username@localhost;

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仔细上面几个命令,可以发现不管是授权,还是撤销授权,都要指定响应的host(即 @ 符号后面的内容),因为以上及格命令实际上都是在操作mysql 数据库中的user表,可以用如下命令查看相应用户及对应的host:

SELECT User, Host FROM user;

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当然,这个表中还包含很多其它例如用户密码、权限设置等很多内容,操作时候尤其需要小心。

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