#
# Bug #19471516 SERVER CRASHES WHEN EXECUTING ALTER TABLE
# ADD FOREIGN KEY
#
CREATE TABLE `department` (`department_id` INT, `department_people_fk` INT,
PRIMARY KEY (`department_id`)) engine=innodb;
CREATE TABLE `title` (`title_id` INT, `title_manager_fk` INT,
`title_reporter_fk` INT, PRIMARY KEY (`title_id`)) engine=innodb;
CREATE TABLE `people` (`people_id` INT, PRIMARY KEY (`people_id`)) engine=innodb;
ALTER TABLE `department` ADD FOREIGN KEY (`department_people_fk`) REFERENCES
`people` (`people_id`);
ALTER TABLE `title` ADD FOREIGN KEY (`title_manager_fk`) REFERENCES `people`
(`people_id`);
ALTER TABLE `title` ADD FOREIGN KEY (`title_reporter_fk`) REFERENCES `people`
(`people_id`);
drop table title, department, people;
create table t1 (a int primary key, b int) engine=innodb;
create table t2 (c int primary key, d int,
foreign key (d) references t1 (a) on update cascade) engine=innodb;
insert t1 values (1,1),(2,2),(3,3);
insert t2 values (4,1),(5,2),(6,3);
flush table t2 with read lock;
connect  con1,localhost,root;
delete from t1 where a=2;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`d`) REFERENCES `t1` (`a`) ON UPDATE CASCADE)
update t1 set a=10 where a=1;
connection default;
unlock tables;
connection con1;
connection default;
lock table t2 write;
connection con1;
delete from t1 where a=2;
connection default;
unlock tables;
connection con1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`d`) REFERENCES `t1` (`a`) ON UPDATE CASCADE)
connection default;
unlock tables;
disconnect con1;
create user foo;
grant select,update on test.t1 to foo;
connect foo,localhost,foo;
update t1 set a=30 where a=3;
disconnect foo;
connection default;
select * from t2;
c	d
5	2
4	10
6	30
drop table t2, t1;
drop user foo;