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create user user_a@localhost;
create user user_b@localhost;
create role role_a;
create role role_b;
grant role_a to user_a@localhost;
grant role_b to user_b@localhost;
grant role_a to user_a@localhost;
grant select on *.* to role_a;
grant role_b to user_b@localhost;
grant insert, update on *.* to role_b;
set default role role_a for user_b@localhost;
ERROR 42000: Access denied for user 'user_a'@'localhost' to database 'mysql'
set default role role_a for user_a@localhost;
set default role invalid_role for user_a@localhost;
ERROR OP000: Invalid role specification `invalid_role`
set default role role_b for user_a@localhost;
ERROR OP000: User `root`@`localhost` has not been granted role `role_b`
set default role role_b for user_b@localhost;
show grants;
Grants for user_a@localhost
GRANT `role_a` TO `user_a`@`localhost`
GRANT USAGE ON *.* TO `user_a`@`localhost`
GRANT SELECT ON *.* TO `role_a`
SET DEFAULT ROLE `role_a` FOR `user_a`@`localhost`
select user, host, default_role from mysql.user where user like 'user_%';
User Host default_role
user_a localhost role_a
user_b localhost role_b
set default role NONE for current_user;
select user, host, default_role from mysql.user where user like 'user_%';
User Host default_role
user_a localhost
user_b localhost role_b
set default role current_role for current_user;
select user, host, default_role from mysql.user where user like 'user_%';
User Host default_role
user_a localhost role_a
user_b localhost role_b
set default role role_b for current_user;
ERROR OP000: User `user_a`@`localhost` has not been granted role `role_b`
show grants;
Grants for user_b@localhost
GRANT `role_b` TO `user_b`@`localhost`
GRANT USAGE ON *.* TO `user_b`@`localhost`
GRANT INSERT, UPDATE ON *.* TO `role_b`
SET DEFAULT ROLE `role_b` FOR `user_b`@`localhost`
select user, host, default_role from mysql.user where user like 'user_%';
ERROR 42000: SELECT command denied to user 'user_b'@'localhost' for table `mysql`.`user`
set default role NONE for user_a@localhost;
show grants;
Grants for user_a@localhost
GRANT `role_a` TO `user_a`@`localhost`
GRANT USAGE ON *.* TO `user_a`@`localhost`
GRANT INSERT, UPDATE ON *.* TO `role_b`
select user, host, default_role from mysql.user where user like 'user_%';
ERROR 42000: SELECT command denied to user 'user_a'@'localhost' for table `mysql`.`user`
drop role role_a;
drop role role_b;
drop user user_a@localhost;
drop user user_b@localhost;
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