USER_ATTRIBUTES

USER_ATTRIBUTES 表提供了用户的注释和属性。该表的数据根据 mysql.user 系统表生成。

USE information_schema; DESC user_attributes;
+-----------+--------------+------+------+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------+--------------+------+------+---------+-------+ | USER | varchar(32) | NO | | NULL | | | HOST | varchar(255) | NO | | NULL | | | ATTRIBUTE | longtext | YES | | NULL | | +-----------+--------------+------+------+---------+-------+ 3 rows in set (0.00 sec)

USER_ATTRIBUTES 表中列的含义如下:

  • USER:用户名。
  • HOST:用户可用于连接的主机。百分号()表示主机名不受限制。
  • ATTRIBUTE:通过 CREATE USERALTER USER 语句设置的用户相关的注释和属性。

示例:

CREATE USER testuser1 COMMENT 'This user is created only for test'; CREATE USER testuser2 ATTRIBUTE '{"email": "user@pingcap.com"}'; SELECT * FROM information_schema.user_attributes;
+-----------+------+---------------------------------------------------+ | USER | HOST | ATTRIBUTE | +-----------+------+---------------------------------------------------+ | root | % | NULL | | testuser1 | % | {"comment": "This user is created only for test"} | | testuser2 | % | {"email": "user@pingcap.com"} | +-----------+------+---------------------------------------------------+ 3 rows in set (0.00 sec)