DROP USER

DROP USER 语句用于从 TiDB 系统数据库中删除用户。如果用户不存在，使用关键词 IF EXISTS 可避免出现警告。

语法图

DropUserStmt:

DropUserStmt

Username:

Username

示例

  1. mysql> DROP USER idontexist;
  2. ERROR 1396 (HY000): Operation DROP USER failed for idontexist@%
  4. mysql> DROP USER IF EXISTS idontexist;
  5. Query OK, 0 rows affected (0.01 sec)
  7. mysql> CREATE USER newuser IDENTIFIED BY 'mypassword';
  8. Query OK, 1 row affected (0.02 sec)
  10. mysql> GRANT ALL ON test.* TO 'newuser';
  11. Query OK, 0 rows affected (0.03 sec)
  13. mysql> SHOW GRANTS FOR 'newuser';
  14. +-------------------------------------------------+
  15. | Grants for newuser@%                            |
  16. +-------------------------------------------------+
  17. | GRANT USAGE ON *.* TO 'newuser'@'%'             |
  18. | GRANT ALL PRIVILEGES ON test.* TO 'newuser'@'%' |
  19. +-------------------------------------------------+
  20. 2 rows in set (0.00 sec)
  22. mysql> REVOKE ALL ON test.* FROM 'newuser';
  23. Query OK, 0 rows affected (0.03 sec)
  25. mysql> SHOW GRANTS FOR 'newuser';
  26. +-------------------------------------+
  27. | Grants for newuser@%                |
  28. +-------------------------------------+
  29. | GRANT USAGE ON *.* TO 'newuser'@'%' |
  30. +-------------------------------------+
  31. 1 row in set (0.00 sec)
  33. mysql> DROP USER newuser;
  34. Query OK, 0 rows affected (0.14 sec)
  36. mysql> SHOW GRANTS FOR newuser;
  37. ERROR 1141 (42000): There is no such grant defined for user 'newuser' on host '%'

MySQL 兼容性

  • 在 TiDB 中删除不存在的用户时，使用 IF EXISTS 可避免出现警告。Issue #10196。

另请参阅