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create user test_user@localhost;
create role test_role1;
create role test_role2;
grant test_role1 to test_user@localhost;
grant test_role2 to test_user@localhost;
grant test_role2 to test_role1;
select user, host from mysql.user where user not like 'root';
User Host
mariadb.sys localhost
test_role1
test_role2
test_user localhost
select * from mysql.roles_mapping;
Host User Role Admin_option
test_role1 test_role2 N
localhost root test_role1 Y
localhost root test_role2 Y
localhost test_user test_role1 N
localhost test_user test_role2 N
select user, host from mysql.db;
user host
%
%
grant select on mysql.* to test_role2;
flush privileges;
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
test_role1 test_role2 N
localhost root test_role1 Y
localhost root test_role2 Y
localhost test_user test_role1 N
localhost test_user test_role2 N
set role none;
select current_user(), current_role();
current_user() current_role()
test_user@localhost NULL
select * from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'test_user'@'localhost' for table 'roles_mapping'
set role test_role2;
select current_user(), current_role();
current_user() current_role()
test_user@localhost test_role2
select * from mysql.roles_mapping;
Host User Role Admin_option
test_role1 test_role2 N
localhost root test_role1 Y
localhost root test_role2 Y
localhost test_user test_role1 N
localhost test_user test_role2 N
create role test_role3;
grant test_role3 to test_role2;
create role test_role4;
grant test_role4 to test_role3;
set role test_role1;
delete from mysql.user where user='no such user';
ERROR 42000: DELETE command denied to user 'test_user'@'localhost' for table 'user'
grant delete on mysql.* to test_role4;
set role test_role1;
delete from mysql.user where user='no such user';
show grants;
Grants for test_user@localhost
GRANT DELETE ON `mysql`.* TO `test_role4`
GRANT SELECT ON `mysql`.* TO `test_role2`
GRANT USAGE ON *.* TO `test_role1`
GRANT USAGE ON *.* TO `test_role2`
GRANT USAGE ON *.* TO `test_role3`
GRANT USAGE ON *.* TO `test_role4`
GRANT USAGE ON *.* TO `test_user`@`localhost`
GRANT `test_role1` TO `test_user`@`localhost`
GRANT `test_role2` TO `test_role1`
GRANT `test_role2` TO `test_user`@`localhost`
GRANT `test_role3` TO `test_role2`
GRANT `test_role4` TO `test_role3`
drop user test_user@localhost;
drop role test_role1, test_role2, test_role3, test_role4;
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