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ALTER USER
TiDB 数据库中 ALTER USER 的使用概况。
/docs-cn/dev/sql-statements/sql-statement-alter-user/
/docs-cn/dev/reference/sql/statements/alter-user/

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 ::=
    'ALTER' 'USER' IfExists (UserSpecList RequireClauseOpt ConnectionOptions PasswordOption LockOption AttributeOption | 'USER' '(' ')' 'IDENTIFIED' 'BY' AuthString) ResourceGroupNameOption

UserSpecList ::=
    UserSpec ( ',' UserSpec )*

UserSpec ::=
    Username AuthOption

Username ::=
    StringName ('@' StringName | singleAtIdentifier)? | 'CURRENT_USER' OptionalBraces

AuthOption ::=
    ( 'IDENTIFIED' ( 'BY' ( AuthString | 'PASSWORD' HashString ) | 'WITH' StringName ( 'BY' AuthString | 'AS' HashString )? ) )?

PasswordOption ::= ( 'PASSWORD' 'EXPIRE' ( 'DEFAULT' | 'NEVER' | 'INTERVAL' N 'DAY' )? | 'PASSWORD' 'HISTORY' ( 'DEFAULT' | N ) | 'PASSWORD' 'REUSE' 'INTERVAL' ( 'DEFAULT' | N 'DAY' ) | 'FAILED_LOGIN_ATTEMPTS' N | 'PASSWORD_LOCK_TIME' ( N | 'UNBOUNDED' ) )*

LockOption ::= ( 'ACCOUNT' 'LOCK' | 'ACCOUNT' 'UNLOCK' )?

AttributeOption ::= ( 'COMMENT' CommentString | 'ATTRIBUTE' AttributeString )?

ResourceGroupNameOption::= ( 'RESOURCE' 'GROUP' Identifier)?

示例

{{< copyable "sql" >}}

CREATE USER 'newuser' IDENTIFIED BY 'newuserpassword';
Query OK, 1 row affected (0.01 sec)

{{< copyable "sql" >}}

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)

{{< copyable "sql" >}}

ALTER USER 'newuser' IDENTIFIED BY 'newnewpassword';
Query OK, 0 rows affected (0.02 sec)

{{< copyable "sql" >}}

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)

{{< copyable "sql" >}}

ALTER USER 'newuser' ACCOUNT LOCK;
Query OK, 0 rows affected (0.02 sec)

修改 newuser 的属性：

ALTER USER 'newuser' ATTRIBUTE '{"newAttr": "value", "deprecatedAttr": null}';
SELECT * FROM information_schema.user_attributes;
+-----------+------+--------------------------+
| USER      | HOST | ATTRIBUTE                |
+-----------+------+--------------------------+
| newuser   | %    | {"newAttr": "value"}     |
+-----------+------+--------------------------+
1 rows in set (0.00 sec)

通过 ALTER USER ... COMMENT 修改用户 newuser 的注释：

ALTER USER 'newuser' COMMENT 'Here is the comment';
SELECT * FROM information_schema.user_attributes;
+-----------+------+--------------------------------------------------------+
| USER      | HOST | ATTRIBUTE                                              |
+-----------+------+--------------------------------------------------------+
| newuser   | %    | {"comment": "Here is the comment", "newAttr": "value"} |
+-----------+------+--------------------------------------------------------+
1 rows in set (0.00 sec)

通过 ALTER USER ... ATTRIBUTE 删除用户 newuser 的注释：

ALTER USER 'newuser' ATTRIBUTE '{"comment": null}';
SELECT * FROM information_schema.user_attributes;
+-----------+------+---------------------------+
| USER      | HOST | ATTRIBUTE                 |
+-----------+------+---------------------------+
| newuser   | %    | {"newAttr": "value"}      |
+-----------+------+---------------------------+
1 rows in set (0.00 sec)

通过 ALTER USER ... PASSWORD EXPIRE NEVER 修改用户 newuser 的自动密码过期策略为永不过期：

ALTER USER 'newuser' PASSWORD EXPIRE NEVER;
Query OK, 0 rows affected (0.02 sec)

通过 ALTER USER ... PASSWORD REUSE INTERVAL ... DAY 修改用户 newuser 的密码重用策略为不允许重复使用最近 90 天内使用过的密码：

ALTER USER 'newuser' PASSWORD REUSE INTERVAL 90 DAY;
Query OK, 0 rows affected (0.02 sec)

通过 ALTER USER ... RESOURCE GROUP 修改用户 newuser 的资源组到 rg1：

ALTER USER 'newuser' RESOURCE GROUP rg1;
Query OK, 0 rows affected (0.02 sec)

另请参阅