mysql授权用户，撤销用户，撤销权限基本操作

进入mysql库

use mysql;
mysql> select host,user from user;
+-----------+---------------+
| host      | user          |
+-----------+---------------+
| %         | root          |
| localhost | mysql.session |
| localhost | mysql.sys     |
| localhost | root          |
+-----------+---------------+
4 rows in set (0.00 sec)

select host,user from user where user='root';

将相应用户数据表中的host字段改成'%'；

update user set host='%' where user='root';
update user set host='localhost' where user='root' and host='192.168.%.%';
//ERROR 1062 (23000): Duplicate entry '%-root' for key 'PRIMARY' 不予理会
flush privileges

授权用户

grant all privileges on *.* to 'root'@'172.18.%.%' identified by '123456' with grant option;
grant all privileges on *.* to 'root'@'192.168.1.%' identified by '123456' with grant option;

撤销权限

revoke all privileges on *.* from root@'%';
revoke all privileges on db01.* from root@'%';

删除用户

drop user 'test'@'localhost';

查看用户的授权

mysql> SHOW GRANTS FOR 'user01'@'%';
+--------------------------------------------------------+
| Grants for user01@%                                 |
+--------------------------------------------------------+
| GRANT USAGE ON *.* TO 'root'@'%'                  |
| GRANT ALL PRIVILEGES ON `db01`.* TO 'user01'@'%' |
+--------------------------------------------------------+
2 rows in set (0.00 sec)

//USAGE:create user时的默认的空权限，只能连库，所以user01现在的权限是在mysql01数据库上有所有的权限。