drop database if exists db;
Warnings:
Note	1008	Can't drop database 'db'; database doesn't exist
create role r1;
create user beep@'%';
create database db;
create table db.t1 (i int);
create table db.t2 (b int);
grant select on db.* to r1;
grant r1 to beep@'%';
connect  con1,localhost,beep,,;
show databases;
Database
information_schema
show create database db;
ERROR 42000: Access denied for user 'beep'@'localhost' to database 'db'
select table_schema, table_name from information_schema.tables
where table_schema = 'db' order by table_name;
table_schema	table_name
set role r1;
show databases;
Database
db
information_schema
show create database db;
Database	Create Database
db	CREATE DATABASE `db` /*!40100 DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci */
select table_schema, table_name from information_schema.tables
where table_schema = 'db' order by table_name;
table_schema	table_name
db	t1
db	t2
connection default;
create role r2;
create user beep2@'%';
grant update on db.* to r2;
grant r2 to beep2;
connect  con2,localhost,beep2,,;
show databases;
Database
information_schema
show create database db;
ERROR 42000: Access denied for user 'beep2'@'localhost' to database 'db'
select table_schema, table_name from information_schema.tables
where table_schema = 'db' order by table_name;
table_schema	table_name
set role r2;
show databases;
Database
db
information_schema
show create database db;
Database	Create Database
db	CREATE DATABASE `db` /*!40100 DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci */
select table_schema, table_name from information_schema.tables
where table_schema = 'db' order by table_name;
table_schema	table_name
db	t1
db	t2
connection default;
drop database db;
drop role r1;
drop user beep;
drop role r2;
drop user beep2;