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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| --- | ||
| title: mysql.user | ||
| summary: 了解 `mysql` 系统表 `user`。 | ||
| --- | ||
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| # `mysql.user` | ||
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| `mysql.user` 表提供用户账户及其权限的信息。 | ||
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| 使用以下 SQL 语句查看 `mysql.user` 表的结构： | ||
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| ```sql | ||
| DESC mysql.user; | ||
| ``` | ||
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| 输出结果如下： | ||
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| ``` | ||
| +------------------------+----------------------+------+------+-------------------+-------+ | ||
| | Field | Type | Null | Key | Default | Extra | | ||
| +------------------------+----------------------+------+------+-------------------+-------+ | ||
| | Host | char(255) | NO | PRI | NULL | | | ||
| | User | char(32) | NO | PRI | NULL | | | ||
| | authentication_string | text | YES | | NULL | | | ||
| | plugin | char(64) | YES | | NULL | | | ||
| | Select_priv | enum('N','Y') | NO | | N | | | ||
| | Insert_priv | enum('N','Y') | NO | | N | | | ||
| | Update_priv | enum('N','Y') | NO | | N | | | ||
| | Delete_priv | enum('N','Y') | NO | | N | | | ||
| | Create_priv | enum('N','Y') | NO | | N | | | ||
| | Drop_priv | enum('N','Y') | NO | | N | | | ||
| | Process_priv | enum('N','Y') | NO | | N | | | ||
| | Grant_priv | enum('N','Y') | NO | | N | | | ||
| | References_priv | enum('N','Y') | NO | | N | | | ||
| | Alter_priv | enum('N','Y') | NO | | N | | | ||
| | Show_db_priv | enum('N','Y') | NO | | N | | | ||
| | Super_priv | enum('N','Y') | NO | | N | | | ||
| | Create_tmp_table_priv | enum('N','Y') | NO | | N | | | ||
| | Lock_tables_priv | enum('N','Y') | NO | | N | | | ||
| | Execute_priv | enum('N','Y') | NO | | N | | | ||
| | Create_view_priv | enum('N','Y') | NO | | N | | | ||
| | Show_view_priv | enum('N','Y') | NO | | N | | | ||
| | Create_routine_priv | enum('N','Y') | NO | | N | | | ||
| | Alter_routine_priv | enum('N','Y') | NO | | N | | | ||
| | Index_priv | enum('N','Y') | NO | | N | | | ||
| | Create_user_priv | enum('N','Y') | NO | | N | | | ||
| | Event_priv | enum('N','Y') | NO | | N | | | ||
| | Repl_slave_priv | enum('N','Y') | NO | | N | | | ||
| | Repl_client_priv | enum('N','Y') | NO | | N | | | ||
| | Trigger_priv | enum('N','Y') | NO | | N | | | ||
| | Create_role_priv | enum('N','Y') | NO | | N | | | ||
| | Drop_role_priv | enum('N','Y') | NO | | N | | | ||
| | Account_locked | enum('N','Y') | NO | | N | | | ||
| | Shutdown_priv | enum('N','Y') | NO | | N | | | ||
| | Reload_priv | enum('N','Y') | NO | | N | | | ||
| | FILE_priv | enum('N','Y') | NO | | N | | | ||
| | Config_priv | enum('N','Y') | NO | | N | | | ||
| | Create_Tablespace_Priv | enum('N','Y') | NO | | N | | | ||
| | Password_reuse_history | smallint(5) unsigned | YES | | NULL | | | ||
| | Password_reuse_time | smallint(5) unsigned | YES | | NULL | | | ||
| | User_attributes | json | YES | | NULL | | | ||
| | Token_issuer | varchar(255) | YES | | NULL | | | ||
| | Password_expired | enum('N','Y') | NO | | N | | | ||
| | Password_last_changed | timestamp | YES | | CURRENT_TIMESTAMP | | | ||
| | Password_lifetime | smallint(5) unsigned | YES | | NULL | | | ||
| +------------------------+----------------------+------+------+-------------------+-------+ | ||
| 44 rows in set (0.00 sec) | ||
| ``` | ||
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| `mysql.user` 表包含多个字段，可分为三组： | ||
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| * 账户相关字段： | ||
| * `Host`：指定 TiDB 用户账户的主机名。 | ||
| * `User`：指定 TiDB 用户账户的用户名。 | ||
| * 权限相关字段： | ||
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| 以 `_priv` 或 `_Priv` 结尾的字段定义授予用户账户的权限。例如，`Select_priv` 表示用户账户具有全局 `Select` 权限。更多信息，请参考 [TiDB 各操作需要的权限](/privilege-management.md#tidb-各操作需要的权限)。 | ||
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| * 安全相关字段： | ||
| * `authentication_string` 和 `plugin`：`authentication_string` 存储用户账户的凭证。凭证根据 `plugin` 字段指定的认证插件进行验证。 | ||
| * `Account_locked`：表示用户账户是否被锁定。 | ||
| * `Password_reuse_history` 和 `Password_reuse_time`：用于[密码重用策略](/password-management.md#密码重用策略)。 | ||
| * `User_attributes`：提供用户账户注释和用户账户属性信息。 | ||
| * `Token_issuer`：用于 [`tidb_auth_token`](/security-compatibility-with-mysql.md#tidb_auth_token) 认证插件。 | ||
| * `Password_expired`、`Password_last_changed` 和 `Password_lifetime`：用于[密码过期策略](/password-management.md#密码过期策略)。 | ||
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| 虽然 TiDB `mysql.user` 表中的大多数字段也存在于 MySQL `mysql.user` 表中，但 `Token_issuer` 字段是 TiDB 特有的。 |
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