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:
UserSpecList:
UserSpec:
示例
mysql> CREATE USER 'newuser' IDENTIFIED BY 'newuserpassword';
Query OK, 1 row affected (0.01 sec)
mysql> 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 |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
row in set (0.00 sec)
mysql> ALTER USER 'newuser' IDENTIFIED BY 'newnewpassword';
Query OK, 0 rows affected (0.02 sec)
mysql> 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 |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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
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