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
ALTERUSERIfExistsUserSpecListRequireClauseOptConnectionOptionsPasswordOrLockOptionsUSER()IDENTIFIEDBYAuthString
UserSpecList
UserSpec,
UserSpec
UsernameAuthOption

示例

mysql> CREATE USER 'newuser' IDENTIFIED BY 'newuserpassword'; Query OK, 1 row affected (0.01 sec) mysql> SELECT USER, HOST, PASSWORD FROM mysql.`user` WHERE USER = 'newuser'; +---------+------+-------------------------------------------+ | USER | HOST | PASSWORD | +---------+------+-------------------------------------------+ | newuser | % | *5806E04BBEE79E1899964C6A04D68BCA69B1A879 | +---------+------+-------------------------------------------+ 1 row in set (0.00 sec) mysql> ALTER USER 'newuser' IDENTIFIED BY 'newnewpassword'; Query OK, 0 rows affected (0.02 sec) mysql> SELECT USER, HOST, PASSWORD FROM mysql.`user` WHERE USER = 'newuser'; +---------+------+-------------------------------------------+ | USER | HOST | PASSWORD | +---------+------+-------------------------------------------+ | newuser | % | *FB8A1EA1353E8775CA836233E367FBDFCB37BE73 | +---------+------+-------------------------------------------+ 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 尚未支持此功能。

另请参阅

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