MySQL服务器的用户权限管理

-- 授权一个用户（zhangsan）密码123，可以对所有的库，所有的表做所有操作。
mysql> grant all on *.* to zhangsan@'%' identified by '123';
Query OK, 0 rows affected (0.17 sec)

--刷新生效，否则就要重启MySQL服务才可以。
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

--浏览当前MySQL用户信息
mysql> select user,host,password from mysql.user;
+----------+-----------------+-------------------------------------------+
| user     | host            | password                                  |
+----------+-----------------+-------------------------------------------+
| root     | localhost       | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
| root     | 127.0.0.1       |                                           |
|          | localhost       |                                           |
| zhangsan | %               | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
| admin    | 192.168.112.132 | *23AE809DDACAF96AF0FD78ED04B6A265E05AA257 |
+----------+-----------------+-------------------------------------------+
5 rows in set (0.00 sec)

-- 移除一些权限
-- revoke:只删除了用户权限，但没有删除这个用户
mysql> revoke insert,delete on *.* from admin@192.168.112.132 identified by'123';

-- 查看指定用户的权限信息
mysql> show grants for xbb@localhost;
+------------------------------------------------------------------------------------------------------------+
| Grants for xbb@localhost                                                                                   |
+------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'xbb'@'localhost' IDENTIFIED BY PASSWORD '*23AE809DDACAF96AF0FD78ED04B6A265E05AA257' |
+------------------------------------------------------------------------------------------------------------+

--drop user:删除了整个用户及其权限（包括数据字典中的数据）
mysql> drop user 'xbb'@'localhost';
Query OK, 0 rows affected (0.00 sec)

mysql> select user,host from mysql.user;
+------------------+-----------+
| user             | host      |
+------------------+-----------+
| root             | 127.0.0.1 |
| debian-sys-maint | localhost |
| root             | localhost |
| root             | wangxg    |
+------------------+-----------+
4 rows in set (0.00 sec)