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 <role> - 图1

RolenameList

REVOKE <role> - 图2

UsernameList

REVOKE <role> - 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