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

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