ALTER USER

ALTER USER 语句用于更改 TiDB 权限系统内的已有用户。和 MySQL 一样，在 TiDB 权限系统中，用户是用户名和用户名所连接主机的组合。因此，可创建一个用户 'newuser2'@'192.168.1.1'，使其只能通过 IP 地址 192.168.1.1 进行连接。相同的用户名从不同主机登录时可能会拥有不同的权限。

语法图

AlterUserStmt:

AlterUserStmt

UserSpecList:

UserSpecList

UserSpec:

UserSpec

示例

  1. mysql> CREATE USER 'newuser' IDENTIFIED BY 'newuserpassword';
  2. Query OK, 1 row affected (0.01 sec)
  4. mysql> SHOW CREATE USER 'newuser';
  5. +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  6. | CREATE USER for newuser@%                                                                                                                                            |
  7. +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  8. | CREATE USER 'newuser'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*5806E04BBEE79E1899964C6A04D68BCA69B1A879' REQUIRE NONE PASSWORD EXPIRE DEFAULT ACCOUNT UNLOCK |
  9. +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  10. 1 row in set (0.00 sec)
  12. mysql> ALTER USER 'newuser' IDENTIFIED BY 'newnewpassword';
  13. Query OK, 0 rows affected (0.02 sec)
  15. mysql> SHOW CREATE USER 'newuser';
  16. +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  17. | CREATE USER for newuser@%                                                                                                                                            |
  18. +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  19. | CREATE USER 'newuser'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*FB8A1EA1353E8775CA836233E367FBDFCB37BE73' REQUIRE NONE PASSWORD EXPIRE DEFAULT ACCOUNT UNLOCK |
  20. +----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
  21. 1 row in set (0.00 sec)

MySQL 兼容性

  • 在 MySQL 中，ALTER 语句用于更改属性，例如使密码失效。但 TiDB 尚不支持此功能。

另请参阅