REVOKE <role>

REVOKE <role> 语句用于从指定的用户（或用户列表）中收回之前授予的角色。

语法图

RevokeRoleStmt

REVOKE - 图1

RolenameList

REVOKE - 图2

UsernameList

REVOKE - 图3

1. RevokeRoleStmt ::=
2. 'REVOKE' RolenameList 'FROM' UsernameList

4. RolenameList ::=
5. Rolename ( ',' Rolename )*

7. UsernameList ::=
8. Username ( ',' Username )*

示例

以 root 用户连接 TiDB：

1. mysql -h 127.0.0.1 -P 4000 -u root

创建新角色 analyticsteam 和新用户 jennifer：

1. CREATE ROLE analyticsteam;
2. Query OK, 0 rows affected (0.02 sec)

4. GRANT SELECT ON test.* TO analyticsteam;
5. Query OK, 0 rows affected (0.02 sec)

7. CREATE USER jennifer;
8. Query OK, 0 rows affected (0.01 sec)

10. GRANT analyticsteam TO jennifer;
11. Query OK, 0 rows affected (0.01 sec)

以 jennifer 用户连接 TiDB：

1. mysql -h 127.0.0.1 -P 4000 -u jennifer

需要注意的是，默认情况下，用户 jennifer 需要执行 SET ROLE analyticsteam 语句才能使用与角色相关联的权限：

1. SHOW GRANTS;
2. +---------------------------------------------+
3. | Grants for User                             |
4. +---------------------------------------------+
5. | GRANT USAGE ON *.* TO 'jennifer'@'%'        |
6. | GRANT 'analyticsteam'@'%' TO 'jennifer'@'%' |
7. +---------------------------------------------+
8. 2 rows in set (0.00 sec)

10. SHOW TABLES in test;
11. ERROR 1044 (42000): Access denied for user 'jennifer'@'%' to database 'test'
12. SET ROLE analyticsteam;
13. Query OK, 0 rows affected (0.00 sec)

15. SHOW GRANTS;
16. +---------------------------------------------+
17. | Grants for User                             |
18. +---------------------------------------------+
19. | GRANT USAGE ON *.* TO 'jennifer'@'%'        |
20. | GRANT SELECT ON test.* TO 'jennifer'@'%'    |
21. | GRANT 'analyticsteam'@'%' TO 'jennifer'@'%' |
22. +---------------------------------------------+
23. 3 rows in set (0.00 sec)

25. SHOW TABLES IN test;
26. +----------------+
27. | Tables_in_test |
28. +----------------+
29. | t1             |
30. +----------------+
31. 1 row in set (0.00 sec)

以 root 用户连接 TiDB：

1. mysql -h 127.0.0.1 -P 4000 -u root

执行 SET DEFAULT ROLE 语句将用户 jennifer 与 analyticsteam 角色相关联：

1. SET DEFAULT ROLE analyticsteam TO jennifer;
2. Query OK, 0 rows affected (0.02 sec)

以 jennifer 用户连接 TiDB：

1. mysql -h 127.0.0.1 -P 4000 -u jennifer

此时 jennifer 用户无需执行 SET ROLE 语句就能拥有 analyticsteam 角色相关联的权限：

1. SHOW GRANTS;
2. +---------------------------------------------+
3. | Grants for User                             |
4. +---------------------------------------------+
5. | GRANT USAGE ON *.* TO 'jennifer'@'%'        |
6. | GRANT SELECT ON test.* TO 'jennifer'@'%'    |
7. | GRANT 'analyticsteam'@'%' TO 'jennifer'@'%' |
8. +---------------------------------------------+
9. 3 rows in set (0.00 sec)

11. SHOW TABLES IN test;
12. +----------------+
13. | Tables_in_test |
14. +----------------+
15. | t1             |
16. +----------------+
17. 1 row in set (0.00 sec)

以 root 用户连接 TiDB：

1. mysql -h 127.0.0.1 -P 4000 -u root

收回角色 analyticsteam：

1. REVOKE analyticsteam FROM jennifer;
2. Query OK, 0 rows affected (0.01 sec)

以 jennifer 用户连接 TiDB：

1. mysql -h 127.0.0.1 -P 4000 -u jennifer

查看 jennifer 用户的权限：

1. SHOW GRANTS;
2. +--------------------------------------+
3. | Grants for User                      |
4. +--------------------------------------+
5. | GRANT USAGE ON *.* TO 'jennifer'@'%' |
6. +--------------------------------------+
7. 1 row in set (0.00 sec)

MySQL 兼容性

REVOKE <role> 语句与 MySQL 8.0 的角色功能完全兼容。如发现任何兼容性差异，请在 GitHub 上提交 issue。

另请参阅