Question

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:

UserSpecList:

UserSpec:

Username:

AuthOption:

示例

CREATE USER 'newuser' IDENTIFIED BY 'newuserpassword';

Query OK, 1 row affected (0.01 sec)

SHOW CREATE USER 'newuser';

| CREATE USER for newuser@%                                                                                                                                            |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| CREATE USER 'newuser'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*5806E04BBEE79E1899964C6A04D68BCA69B1A879' REQUIRE NONE PASSWORD EXPIRE DEFAULT ACCOUNT UNLOCK |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

ALTER USER 'newuser' IDENTIFIED BY 'newnewpassword';

Query OK, 0 rows affected (0.02 sec)

SHOW CREATE USER 'newuser';

| CREATE USER for newuser@%                                                                                                                                            |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| CREATE USER 'newuser'@'%' IDENTIFIED WITH 'mysql_native_password' AS '*FB8A1EA1353E8775CA836233E367FBDFCB37BE73' REQUIRE NONE PASSWORD EXPIRE DEFAULT ACCOUNT UNLOCK |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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

• Security Compatibility with MySQL
• CREATE USER
• DROP USER
• SHOW CREATE USER