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create user 'test_user'@'localhost';
create role test_role1;
grant test_role1 to test_user@localhost;
select user, host from mysql.user where user not like 'root';
user host
test_role1
test_user localhost
select * from mysql.roles_mapping;
Host User Role Admin_option
localhost root test_role1 Y
localhost test_user test_role1 N
grant select on mysql.* to test_role1;
grant insert, delete on mysql.roles_mapping to test_role1;
grant reload on *.* to test_role1;
select * from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'test_user'@'localhost' for table 'roles_mapping'
select current_user(), current_role();
current_user() current_role()
test_user@localhost NULL
set role test_role1;
select current_user(), current_role();
current_user() current_role()
test_user@localhost test_role1
select * from mysql.roles_mapping;
Host User Role Admin_option
localhost root test_role1 Y
localhost test_user test_role1 N
insert into mysql.user (user, host) values ('Dummy', 'Dummy');
ERROR 42000: INSERT command denied to user 'test_user'@'localhost' for table 'user'
insert into mysql.roles_mapping values ('localhost', 'test_user', 'test_role2', 'N');
delete from mysql.roles_mapping where Role='test_role2';
use mysql;
set role none;
select current_user(), current_role();
current_user() current_role()
test_user@localhost NULL
use mysql;
ERROR 42000: Access denied for user 'test_user'@'localhost' to database 'mysql'
select * from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'test_user'@'localhost' for table 'roles_mapping'
insert into mysql.user (user, host) values ('Dummy', 'Dummy');
ERROR 42000: INSERT command denied to user 'test_user'@'localhost' for table 'user'
insert into mysql.roles_mapping values ('localhost', 'test_user', 'test_role2', 'N');
ERROR 42000: INSERT command denied to user 'test_user'@'localhost' for table 'roles_mapping'
delete from mysql.roles_mapping where Role='test_role2';
ERROR 42000: DELETE command denied to user 'test_user'@'localhost' for table 'roles_mapping'
drop user 'test_user'@'localhost';
revoke select on mysql.* from test_role1;
revoke insert, delete on mysql.roles_mapping from test_role1;
drop role test_role1;
delete from mysql.roles_mapping where Role='test_role1';
flush privileges;
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