DROP ROLE

使用 DROP ROLE 语句可删除已用 CREATE ROLE 语句创建的角色。

语法图

  1. DropRoleStmt ::=
  2.     'DROP' 'ROLE' ( 'IF' 'EXISTS' )? RolenameList
  4. RolenameList ::=
  5.     Rolename ( ',' Rolename )*

示例

创建新角色 analyticsteam 和新用户 jennifer：

  1. $ mysql -uroot
  3. CREATE ROLE analyticsteam;
  4. Query OK, 0 rows affected (0.02 sec)
  6. GRANT SELECT ON test.* TO analyticsteam;
  7. Query OK, 0 rows affected (0.02 sec)
  9. CREATE USER jennifer;
  10. Query OK, 0 rows affected (0.01 sec)
  12. GRANT analyticsteam TO jennifer;
  13. Query OK, 0 rows affected (0.01 sec)

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. $ mysql -ujennifer
  3. SHOW GRANTS;
  4. +---------------------------------------------+
  5. | Grants for User                             |
  6. +---------------------------------------------+
  7. | GRANT USAGE ON *.* TO 'jennifer'@'%'        |
  8. | GRANT 'analyticsteam'@'%' TO 'jennifer'@'%' |
  9. +---------------------------------------------+
  10. 2 rows in set (0.00 sec)
  12. SHOW TABLES in test;
  13. ERROR 1044 (42000): Access denied for user 'jennifer'@'%' to database 'test'
  14. SET ROLE analyticsteam;
  15. Query OK, 0 rows affected (0.00 sec)
  17. SHOW GRANTS;
  18. +---------------------------------------------+
  19. | Grants for User                             |
  20. +---------------------------------------------+
  21. | GRANT USAGE ON *.* TO 'jennifer'@'%'        |
  22. | GRANT Select ON test.* TO 'jennifer'@'%'    |
  23. | GRANT 'analyticsteam'@'%' TO 'jennifer'@'%' |
  24. +---------------------------------------------+
  25. 3 rows in set (0.00 sec)
  27. SHOW TABLES IN test;
  28. +----------------+
  29. | Tables_in_test |
  30. +----------------+
  31. | t1             |
  32. +----------------+
  33. 1 row in set (0.00 sec)

执行 SET DEFAULT ROLE 语句将用户 jennifer 与某一角色相关联，这样该用户无需执行 SET ROLE 语句就能拥有与角色相关联的权限。

  1. $ mysql -uroot
  3. SET DEFAULT ROLE analyticsteam TO jennifer;
  4. Query OK, 0 rows affected (0.02 sec)
  1. $ mysql -ujennifer
  3. SHOW GRANTS;
  4. +---------------------------------------------+
  5. | Grants for User                             |
  6. +---------------------------------------------+
  7. | GRANT USAGE ON *.* TO 'jennifer'@'%'        |
  8. | GRANT Select ON test.* TO 'jennifer'@'%'    |
  9. | GRANT 'analyticsteam'@'%' TO 'jennifer'@'%' |
  10. +---------------------------------------------+
  11. 3 rows in set (0.00 sec)
  13. SHOW TABLES IN test;
  14. +----------------+
  15. | Tables_in_test |
  16. +----------------+
  17. | t1             |
  18. +----------------+
  19. 1 row in set (0.00 sec)

删除角色 analyticsteam：

  1. $ mysql -uroot
  3. DROP ROLE analyticsteam;
  4. Query OK, 0 rows affected (0.02 sec)

Jennifer 不再具有与 analyticsteam 关联的默认角色，或不能再将 analyticsteam 设为启用角色：

  1. $ mysql -ujennifer
  3. SHOW GRANTS;
  4. +--------------------------------------+
  5. | Grants for User                      |
  6. +--------------------------------------+
  7. | GRANT USAGE ON *.* TO 'jennifer'@'%' |
  8. +--------------------------------------+
  9. 1 row in set (0.00 sec)
  11. SET ROLE analyticsteam;
  12. ERROR 3530 (HY000): `analyticsteam`@`%` is is not granted to jennifer@%

MySQL 兼容性

DROP 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