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GRANT <role>

Assigns a previously created role to an existing user. The user can use then use the statement SET ROLE <rolename> to assume the privileges of the role, or SET ROLE ALL to assume all roles that have been assigned.

Synopsis

GrantRoleStmt
GRANTRolenameListTOUsernameList
RolenameList
Rolename,
UsernameList
Username,

Examples

Connect to TiDB as the root user:

mysql -h 127.0.0.1 -P 4000 -u root

Create a new role analyticsteam and a new user jennifer:

CREATE ROLE analyticsteam; Query OK, 0 rows affected (0.02 sec) GRANT SELECT ON test.* TO analyticsteam; Query OK, 0 rows affected (0.02 sec) CREATE USER jennifer; Query OK, 0 rows affected (0.01 sec) GRANT analyticsteam TO jennifer; Query OK, 0 rows affected (0.01 sec)

Connect to TiDB as the jennifer user:

mysql -h 127.0.0.1 -P 4000 -u jennifer

Note that by default jennifer needs to execute SET ROLE analyticsteam in order to be able to use the privileges associated with the analyticsteam role:

SHOW GRANTS; +---------------------------------------------+ | Grants for User | +---------------------------------------------+ | GRANT USAGE ON *.* TO 'jennifer'@'%' | | GRANT 'analyticsteam'@'%' TO 'jennifer'@'%' | +---------------------------------------------+ 2 rows in set (0.00 sec) SHOW TABLES in test; ERROR 1044 (42000): Access denied for user 'jennifer'@'%' to database 'test' SET ROLE analyticsteam; Query OK, 0 rows affected (0.00 sec) SHOW GRANTS; +---------------------------------------------+ | Grants for User | +---------------------------------------------+ | GRANT USAGE ON *.* TO 'jennifer'@'%' | | GRANT SELECT ON test.* TO 'jennifer'@'%' | | GRANT 'analyticsteam'@'%' TO 'jennifer'@'%' | +---------------------------------------------+ 3 rows in set (0.00 sec) SHOW TABLES IN test; +----------------+ | Tables_in_test | +----------------+ | t1 | +----------------+ 1 row in set (0.00 sec)

Connect to TiDB as the root user:

mysql -h 127.0.0.1 -P 4000 -u root

The statement SET DEFAULT ROLE can be used to associate the role analyticsteam to jennifer:

SET DEFAULT ROLE analyticsteam TO jennifer; Query OK, 0 rows affected (0.02 sec)

Connect to TiDB as the jennifer user:

mysql -h 127.0.0.1 -P 4000 -u jennifer

After this, the user jennifer has the privileges associated with the role analyticsteam and jennifer does not have to execute the statement SET ROLE:

SHOW GRANTS; +---------------------------------------------+ | Grants for User | +---------------------------------------------+ | GRANT USAGE ON *.* TO 'jennifer'@'%' | | GRANT SELECT ON test.* TO 'jennifer'@'%' | | GRANT 'analyticsteam'@'%' TO 'jennifer'@'%' | +---------------------------------------------+ 3 rows in set (0.00 sec) SHOW TABLES IN test; +----------------+ | Tables_in_test | +----------------+ | t1 | +----------------+ 1 row in set (0.00 sec)

MySQL compatibility

This statement is understood to be fully compatible with roles, which are a feature of MySQL 8.0. Any compatibility differences should be reported via an issue on GitHub.

See also

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