CREATE USER
CREATE USER 语句用于创建带有指定密码的新用户。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
- CreateUserStmt
- IfNotExists
- UserSpecList
- RequireClauseOpt
- RequireList
- UserSpec
- AuthOption
- StringName
- PasswordOption
- LockOption
- AttributeOption
- ResourceGroupNameOption
- RequireClauseOpt
- RequireListElement
CreateUserStmt ::=
'CREATE' 'USER' IfNotExists UserSpecList RequireClauseOpt ConnectionOptions PasswordOption LockOption AttributeOption ResourceGroupNameOption
IfNotExists ::=
('IF' 'NOT' 'EXISTS')?
UserSpecList ::=
UserSpec ( ',' UserSpec )*
RequireClauseOpt ::=
( 'REQUIRE' 'NONE' | 'REQUIRE' 'SSL' | 'REQUIRE' 'X509' | 'REQUIRE' RequireList )?
RequireList ::=
( "ISSUER" stringLit | "SUBJECT" stringLit | "CIPHER" stringLit | "SAN" stringLit | "TOKEN_ISSUER" stringLit )*
UserSpec ::=
Username AuthOption
AuthOption ::=
( 'IDENTIFIED' ( 'BY' ( AuthString | 'PASSWORD' HashString ) | 'WITH' StringName ( 'BY' AuthString | 'AS' HashString )? ) )?
StringName ::=
stringLit
| Identifier
PasswordOption ::= ( 'PASSWORD' 'EXPIRE' ( 'DEFAULT' | 'NEVER' | 'INTERVAL' N 'DAY' )? | 'PASSWORD' 'HISTORY' ( 'DEFAULT' | N ) | 'PASSWORD' 'REUSE' 'INTERVAL' ( 'DEFAULT' | N 'DAY' ) | 'FAILED_LOGIN_ATTEMPTS' N | 'PASSWORD_LOCK_TIME' ( N | 'UNBOUNDED' ) )*
LockOption ::= ( 'ACCOUNT' 'LOCK' | 'ACCOUNT' 'UNLOCK' )?
AttributeOption ::= ( 'COMMENT' CommentString | 'ATTRIBUTE' AttributeString )?
ResourceGroupNameOption::= ( 'RESOURCE' 'GROUP' Identifier)?
RequireClauseOpt ::= ('REQUIRE' ('NONE' | 'SSL' | 'X509' | RequireListElement ('AND'? RequireListElement)*))?
RequireListElement ::= 'ISSUER' Issuer | 'SUBJECT' Subject | 'CIPHER' Cipher | 'SAN' SAN | 'TOKEN_ISSUER' TokenIssuer
示例
创建一个密码为 newuserpassword 的用户。
CREATE USER 'newuser' IDENTIFIED BY 'newuserpassword';
Query OK, 1 row affected (0.04 sec)
创建一个只能在 192.168.1.1 登录的用户，密码为 newuserpassword。
CREATE USER 'newuser2'@'192.168.1.1' IDENTIFIED BY 'newuserpassword';
Query OK, 1 row affected (0.02 sec)
创建一个要求在登录时使用 TLS 连接的用户。
CREATE USER 'newuser3'@'%' IDENTIFIED BY 'newuserpassword' REQUIRE SSL;
Query OK, 1 row affected (0.02 sec)
创建一个要求在登录时提供指定客户端证书的用户。
CREATE USER 'newuser4'@'%' IDENTIFIED BY 'newuserpassword' REQUIRE ISSUER '/C=US/ST=California/L=San Francisco/O=PingCAP';
Query OK, 1 row affected (0.02 sec)
创建一个初始状态下被锁住的用户。
CREATE USER 'newuser5'@'%' ACCOUNT LOCK;
Query OK, 1 row affected (0.02 sec)
创建一个带注释的用户。
CREATE USER 'newuser6'@'%' COMMENT 'This user is created only for test';
SELECT * FROM information_schema.user_attributes;
+-----------+------+---------------------------------------------------+
| USER | HOST | ATTRIBUTE |
+-----------+------+---------------------------------------------------+
| newuser6 | % | {"comment": "This user is created only for test"} |
+-----------+------+---------------------------------------------------+
1 rows in set (0.00 sec)
创建一个具有邮箱 (email) 属性的用户。
CREATE USER 'newuser7'@'%' ATTRIBUTE '{"email": "user@pingcap.com"}';
SELECT * FROM information_schema.user_attributes;
+-----------+------+---------------------------------------------------+
| USER | HOST | ATTRIBUTE |
+-----------+------+---------------------------------------------------+
| newuser7 | % | {"email": "user@pingcap.com"} |
+-----------+------+---------------------------------------------------+
1 rows in set (0.00 sec)
创建一个禁止重复使用最近 5 次密码的用户。
CREATE USER 'newuser8'@'%' PASSWORD HISTORY 5;
Query OK, 1 row affected (0.02 sec)
创建一个密码已经手动过期的用户。
CREATE USER 'newuser9'@'%' PASSWORD EXPIRE;
Query OK, 1 row affected (0.02 sec)
创建一个使用资源组 rg1 的用户：
CREATE USER 'newuser7'@'%' RESOURCE GROUP rg1;
SELECT USER, HOST, USER_ATTRIBUTES FROM MYSQL.USER WHERE USER='newuser7';
+-----------+------+---------------------------------------------------+
| USER | HOST | USER_ATTRIBUTES |
+-----------+------+---------------------------------------------------+
| newuser7 | % | {"resource_group": "rg1"} |
+-----------+------+---------------------------------------------------+
1 rows in set (0.00 sec)
MySQL 兼容性
- TiDB 不支持
WITH MAX_QUERIES_PER_HOUR、WITH MAX_UPDATES_PER_HOUR、WITH MAX_USER_CONNECTIONS等CREATE选项。 - TiDB 不支持
DEFAULT ROLE选项。 - 对于 TiDB 尚不支持的
CREATE选项。这些选项可被解析，但会被忽略。