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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 *.* to test_role1;
select * from mysql.user where user='test_role1';
Host User Password Select_priv Insert_priv Update_priv Delete_priv Create_priv Drop_priv Reload_priv Shutdown_priv Process_priv File_priv Grant_priv References_priv Index_priv Alter_priv Show_db_priv Super_priv Create_tmp_table_priv Lock_tables_priv Execute_priv Repl_slave_priv Repl_client_priv Create_view_priv Show_view_priv Create_routine_priv Alter_routine_priv Create_user_priv Event_priv Trigger_priv Create_tablespace_priv Delete_history_priv ssl_type ssl_cipher x509_issuer x509_subject max_questions max_updates max_connections max_user_connections plugin authentication_string password_expired is_role default_role max_statement_time
test_role1 Y N N N N N N N N N N N N N N N N N N N N N N N N N N N N N 0 0 0 0 N Y 0.000000
select * from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'test_user'@'localhost' for table 'roles_mapping'
show grants;
Grants for test_user@localhost
GRANT USAGE ON *.* TO `test_user`@`localhost`
GRANT `test_role1` TO `test_user`@`localhost`
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
show grants;
Grants for test_user@localhost
GRANT SELECT ON *.* TO `test_role1`
GRANT USAGE ON *.* TO `test_user`@`localhost`
GRANT `test_role1` TO `test_user`@`localhost`
select * from mysql.roles_mapping;
Host User Role Admin_option
localhost root test_role1 Y
localhost test_user test_role1 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'
delete from mysql.user where user='test_role1';
delete from mysql.roles_mapping where Role='test_role1';
flush privileges;
drop user 'test_user'@'localhost';
create user user1;
connect con1,localhost,user1,,;
select current_user;
current_user
user1@%
show grants;
Grants for user1@%
GRANT USAGE ON *.* TO `user1`@`%`
set role none;
connection default;
drop user user1;
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