#################
# Test RESTRICT #
#################
create table parent(
id int unique key
) engine innodb;
create table child(
parent_id int,
sys_start SYS_DATATYPE as row start invisible,
sys_end SYS_DATATYPE as row end invisible,
period for system_time(sys_start, sys_end),
foreign key(parent_id) references parent(id)
on delete restrict
on update restrict
) engine innodb with system versioning;
insert into parent values(1);
insert into child values(1);
delete from parent where id = 1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `child_ibfk_1` FOREIGN KEY (`parent_id`) REFERENCES `parent` (`id`))
delete from child where parent_id = 1;
delete from parent where id = 1;
insert into parent values(1);
insert into child values(1);
update parent set id=id+1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `child_ibfk_1` FOREIGN KEY (`parent_id`) REFERENCES `parent` (`id`))
delete from child;
update parent set id=id+1;
select * from child for system_time all;
parent_id
1
1
drop table child;
drop table parent;
##############################################
# Test when clustered index is a foreign key #
##############################################
create table parent(
id int(10) unsigned unique key
) engine innodb;
create table child(
parent_id int(10) unsigned primary key,
sys_start SYS_DATATYPE as row start invisible,
sys_end SYS_DATATYPE as row end invisible,
period for system_time(sys_start, sys_end),
foreign key(parent_id) references parent(id)
) engine innodb with system versioning;
insert into parent values(1);
insert into child values(1);
delete from parent where id = 1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `child_ibfk_1` FOREIGN KEY (`parent_id`) REFERENCES `parent` (`id`))
drop table child;
drop table parent;
################
# Test CASCADE #
################
create table parent(
id int unique key
) engine innodb;
create table child(
parent_id int,
sys_start SYS_DATATYPE as row start invisible,
sys_end SYS_DATATYPE as row end invisible,
period for system_time(sys_start, sys_end),
foreign key(parent_id) references parent(id)
on delete cascade
on update cascade
) engine innodb with system versioning;
insert into parent values(1);
insert into child values(1);
delete from parent where id = 1;
select * from child;
parent_id
select * from child for system_time all;
parent_id
1
insert into parent values(1);
insert into child values(1);
update parent set id = id + 1;
select * from child;
parent_id
2
select * from child for system_time all;
parent_id
1
1
2
drop table child;
drop table parent;
create or replace table parent (
id int primary key,
sys_start SYS_DATATYPE as row start invisible,
sys_end SYS_DATATYPE as row end invisible,
period for system_time(sys_start, sys_end)
) with system versioning
engine innodb;
create or replace table child (
x int,
parent_id int not null,
constraint `parent-fk`
  foreign key (parent_id) references parent (id)
on delete cascade
on update restrict
)
engine innodb;
insert into parent (id) values (2);
insert into child (x, parent_id) values (2, 2);
delete from parent;
select * from child;
x	parent_id
drop table child;
drop table parent;
create or replace table parent (
id int primary key
)
engine innodb;
create or replace table child (
id int primary key,
parent_id int not null,
row_start SYS_DATATYPE as row start invisible,
row_end SYS_DATATYPE as row end invisible,
period for system_time(row_start, row_end),
constraint `parent-fk`
  foreign key (parent_id) references parent (id)
on delete cascade
on update restrict
) with system versioning
engine innodb;
insert into parent (id) values (3);
insert into child (id, parent_id) values (3, 3);
delete from parent;
select * from child;
id	parent_id
select *, check_row(row_start, row_end) from child for system_time all;
id	parent_id	check_row(row_start, row_end)
3	3	HISTORICAL ROW
drop table child;
drop table parent;
#################
# Test SET NULL #
#################
create or replace table parent(
id int unique key
) engine innodb;
create or replace table child(
parent_id int,
sys_start SYS_DATATYPE as row start invisible,
sys_end SYS_DATATYPE as row end invisible,
period for system_time(sys_start, sys_end),
foreign key(parent_id) references parent(id)
on delete set null
on update set null
) engine innodb with system versioning;
insert into parent values(1);
insert into child values(1);
delete from child;
insert into child values(1);
delete from parent where id = 1;
select * from child;
parent_id
NULL
select *, current_row(sys_end) as current_row from child for system_time all order by sys_end;
parent_id	current_row
1	0
1	0
NULL	1
delete from child;
insert into parent values(1);
insert into child values(1);
update parent set id= id + 1;
select * from child;
parent_id
NULL
select *, current_row(sys_end) as current_row from child for system_time all order by sys_end;
parent_id	current_row
1	0
1	0
NULL	0
1	0
NULL	1
drop table child;
drop table parent;
###########################
# Parent table is foreign #
###########################
create or replace table parent(
id int unique key,
sys_start SYS_DATATYPE as row start invisible,
sys_end SYS_DATATYPE as row end invisible,
period for system_time(sys_start, sys_end)
) engine innodb with system versioning;
create or replace table child(
parent_id int,
foreign key(parent_id) references parent(id)
) engine innodb;
insert into parent values(1);
insert into child values(1);
delete from parent;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `child_ibfk_1` FOREIGN KEY (`parent_id`) REFERENCES `parent` (`id`))
update parent set id=2;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `child_ibfk_1` FOREIGN KEY (`parent_id`) REFERENCES `parent` (`id`))
delete from child;
delete from parent;
insert into child values(1);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `child_ibfk_1` FOREIGN KEY (`parent_id`) REFERENCES `parent` (`id`))
insert into parent values(1);
insert into child values(1);
delete from parent;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `child_ibfk_1` FOREIGN KEY (`parent_id`) REFERENCES `parent` (`id`))
update parent set id=2;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`child`, CONSTRAINT `child_ibfk_1` FOREIGN KEY (`parent_id`) REFERENCES `parent` (`id`))
drop table child;
drop table parent;
###################
# crash on DELETE #
###################
create or replace table a (
cola int(10) primary key,
v_cola int(10) as (cola mod 10) virtual,
sys_start SYS_DATATYPE as row start invisible,
sys_end SYS_DATATYPE as row end invisible,
period for system_time(sys_start, sys_end)
) engine=innodb with system versioning;
create index v_cola on a (v_cola);
create or replace table b(
cola int(10),
v_cola int(10),
sys_start SYS_DATATYPE as row start invisible,
sys_end SYS_DATATYPE as row end invisible,
period for system_time(sys_start, sys_end)
) engine=innodb with system versioning;
alter table b add constraint `v_cola_fk`
foreign key (v_cola) references a (v_cola);
insert into a(cola) values (12);
insert into b(cola, v_cola) values (10,2);
delete from a;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`b`, CONSTRAINT `v_cola_fk` FOREIGN KEY (`v_cola`) REFERENCES `a` (`v_cola`))
drop table b, a;
###############################################
# CASCADE UPDATE foreign not system versioned #
###############################################
create or replace table parent (
id smallint unsigned not null auto_increment,
value int unsigned not null,
primary key (id, value)
) engine = innodb;
create or replace table child (
id mediumint unsigned not null auto_increment primary key,
parent_id smallint unsigned not null,
parent_value int unsigned not null,
sys_start SYS_DATATYPE as row start invisible,
sys_end SYS_DATATYPE as row end invisible,
period for system_time(sys_start, sys_end),
constraint `fk_child_parent`
    foreign key (parent_id, parent_value) references parent (id, value)
on delete cascade
on update cascade
) engine = innodb with system versioning;
create or replace table subchild (
id int not null auto_increment primary key,
parent_id smallint unsigned not null,
parent_value int unsigned not null,
constraint `fk_subchild_child_parent`
    foreign key (parent_id, parent_value) references child (parent_id, parent_value)
on delete cascade
on update cascade
) engine=innodb;
insert into parent (value) values (23);
select id, value from parent into @id, @value;
Warnings:
Warning	1287	'<select expression> INTO <destination>;' is deprecated and will be removed in a future release. Please use 'SELECT <select list> INTO <destination> FROM...' instead
insert into child values (default, @id, @value);
insert into subchild values (default, @id, @value);
select parent_id from subchild;
parent_id
1
update parent set id = 11, value = value + 1;
select parent_id from subchild;
parent_id
11
select * from child;
id	parent_id	parent_value
1	11	24
delete from parent;
select count(*) from child;
count(*)
0
select * from child for system_time all;
id	parent_id	parent_value
1	1	23
1	11	24
select count(*) from subchild;
count(*)
0
drop table subchild, child, parent;