MySQL的用户受权

格式：

grant 权限 on 库 to 用户@'容许登陆的主机' identity by '密码' 拥有受权权限（可选项）;

权限：

all            #全部权限

usage           #没有权限

select update delete         #个别权限 多个用逗号隔开

库：

*.*        #全部表

库.*        #单个库

库.表         #单个表

登陆主机：

localhost        #仅本地登陆

%            #任何主机

192.168.1.%            #指定网段

192.168.1.11            #指定主机

受权权限：

with grant option

举例：

授予oschina用户在任何主机登陆对全部表的全部权限登陆密码为123qq...A 及 受权权限

mysql> grant all on *.* to oschina@'%' identified by '123qqq...A' with grant option;
Query OK, 0 rows affected, 1 warning (0.04 sec)
mysql> show grants for oschina@'%';      #查看权限
+----------------------------------------------------------------+
| Grants for oschina@%                                           |
+----------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'oschina'@'%' WITH GRANT OPTION |
+----------------------------------------------------------------+
1 row in set (0.00 sec)

受权用户os1 仅能够本地登陆 仅对oschina库的b1 表拥有 select 和 update 权限

mysql> grant select,update on oschina.b1 to os1@localhost identified by '123qqq...A';
Query OK, 0 rows affected, 1 warning (0.26 sec)

mysql> show grants for os1@localhost;
+-------------------------------------------------------------+
| Grants for os1@localhost                                    |
+-------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'os1'@'localhost'                     |
| GRANT SELECT, UPDATE ON `oschina`.`b1` TO 'os1'@'localhost' |
+-------------------------------------------------------------+
2 rows in set (0.00 sec)

删除受权用户：

mysql> drop user oschina@'%';
Query OK, 0 rows affected (0.00 sec)

修改用户os1的登陆密码

mysql> set password for os1@localhost=password('123qqq...OS');
Query OK, 0 rows affected, 1 warning (0.00 sec

撤销权限

撤销用户os1 对oschina库下b1的select 权限

mysql> revoke select on oschina.b1 from os1@localhost;
Query OK, 0 rows affected (0.00 sec)

撤销 用户oschina 的受权权限

mysql> revoke grant option on *.* from oschina@'%';