use test;
grant usage on *.* to user1@localhost;
flush privileges;
drop database if exists db1_secret;
create database db1_secret;
use db1_secret;
create table t1 ( u varchar(64), i int );
create procedure stamp(i int)
insert into db1_secret.t1 values (user(), i);
show procedure status like 'stamp';
Db	Name	Type	Definer	Modified	Created	Security_type	Comment
db1_secret	stamp	PROCEDURE	root@localhost	0000-00-00 00:00:00	0000-00-00 00:00:00	DEFINER	
create function db() returns varchar(64) return database();
show function status like 'db';
Db	Name	Type	Definer	Modified	Created	Security_type	Comment
db1_secret	db	FUNCTION	root@localhost	0000-00-00 00:00:00	0000-00-00 00:00:00	DEFINER	
call stamp(1);
select * from t1;
u	i
root@localhost	1
select db();
db()
db1_secret
call db1_secret.stamp(2);
select db1_secret.db();
db1_secret.db()
db1_secret
select * from db1_secret.t1;
ERROR 42000: Access denied for user: 'user1'@'localhost' to database 'db1_secret'
call db1_secret.stamp(3);
select db1_secret.db();
db1_secret.db()
db1_secret
select * from db1_secret.t1;
ERROR 42000: Access denied for user: ''@'localhost' to database 'db1_secret'
select * from t1;
u	i
root@localhost	1
user1@localhost	2
anon@localhost	3
alter procedure stamp sql security invoker;
show procedure status like 'stamp';
Db	Name	Type	Definer	Modified	Created	Security_type	Comment
db1_secret	stamp	PROCEDURE	root@localhost	0000-00-00 00:00:00	0000-00-00 00:00:00	INVOKER	
alter function db sql security invoker;
show function status like 'db';
Db	Name	Type	Definer	Modified	Created	Security_type	Comment
db1_secret	db	FUNCTION	root@localhost	0000-00-00 00:00:00	0000-00-00 00:00:00	INVOKER	
call stamp(4);
select * from t1;
u	i
root@localhost	1
user1@localhost	2
anon@localhost	3
root@localhost	4
select db();
db()
db1_secret
call db1_secret.stamp(5);
ERROR 42000: Access denied for user: 'user1'@'localhost' to database 'db1_secret'
select db1_secret.db();
ERROR 42000: Access denied for user: 'user1'@'localhost' to database 'db1_secret'
call db1_secret.stamp(6);
ERROR 42000: Access denied for user: ''@'localhost' to database 'db1_secret'
select db1_secret.db();
ERROR 42000: Access denied for user: ''@'localhost' to database 'db1_secret'
drop database if exists db2;
create database db2;
use db2;
create table t2 (s1 int);
insert into t2 values (0);
grant usage on db2.* to user1@localhost;
grant select on db2.* to user1@localhost;
grant usage on db2.* to user2@localhost;
grant select,insert,update,delete on db2.* to user2@localhost;
flush privileges;
use db2;
create procedure p () insert into t2 values (1);
call p();
ERROR 42000: Access denied for user: 'user1'@'localhost' to database 'db2'
use db2;
call p();
ERROR 42000: Access denied for user: 'user1'@'localhost' to database 'db2'
select * from t2;
s1
0
create procedure q () insert into t2 values (2);
call q();
select * from t2;
s1
0
2
use db2;
call q();
select * from t2;
s1
0
2
2
drop procedure db1_secret.stamp;
drop function db1_secret.db;
drop procedure db2.p;
drop procedure db2.q;
use test;
drop database db1_secret;
drop database db2;
delete from mysql.user where user='user1' or user='user2';