CREATE EXTENSION refint;

create table pkeys (pkey1 int4 not null, pkey2 text not null);
create table fkeys (fkey1 int4, fkey2 text, fkey3 int);
create table fkeys2 (fkey21 int4, fkey22 text, pkey23 int not null);

create index fkeys_i on fkeys (fkey1, fkey2);
create index fkeys2_i on fkeys2 (fkey21, fkey22);
create index fkeys2p_i on fkeys2 (pkey23);

insert into pkeys values (10, '1');
insert into pkeys values (20, '2');
insert into pkeys values (30, '3');
insert into pkeys values (40, '4');
insert into pkeys values (50, '5');
insert into pkeys values (60, '6');
create unique index pkeys_i on pkeys (pkey1, pkey2);

--
-- For fkeys:
-- 	(fkey1, fkey2)	--> pkeys (pkey1, pkey2)
-- 	(fkey3)		--> fkeys2 (pkey23)
--
create trigger check_fkeys_pkey_exist
	after insert or update on fkeys
	for each row
	execute function
	check_primary_key ('fkey1', 'fkey2', 'pkeys', 'pkey1', 'pkey2');

create trigger check_fkeys_pkey2_exist
	after insert or update on fkeys
	for each row
	execute function check_primary_key ('fkey3', 'fkeys2', 'pkey23');

--
-- For fkeys2:
-- 	(fkey21, fkey22)	--> pkeys (pkey1, pkey2)
--
create trigger check_fkeys2_pkey_exist
	after insert or update on fkeys2
	for each row
	execute procedure
	check_primary_key ('fkey21', 'fkey22', 'pkeys', 'pkey1', 'pkey2');

--
-- For pkeys:
-- 	ON DELETE/UPDATE (pkey1, pkey2) CASCADE:
-- 		fkeys (fkey1, fkey2) and fkeys2 (fkey21, fkey22)
--
create trigger check_pkeys_fkey_cascade
	after delete or update on pkeys
	for each row
	execute procedure
	check_foreign_key (2, 'cascade', 'pkey1', 'pkey2',
	'fkeys', 'fkey1', 'fkey2', 'fkeys2', 'fkey21', 'fkey22');

--
-- For fkeys2:
-- 	ON DELETE/UPDATE (pkey23) RESTRICT:
-- 		fkeys (fkey3)
--
create trigger check_fkeys2_fkey_restrict
	after delete or update on fkeys2
	for each row
	execute procedure check_foreign_key (1, 'restrict', 'pkey23', 'fkeys', 'fkey3');

insert into fkeys2 values (10, '1', 1);
insert into fkeys2 values (30, '3', 2);
insert into fkeys2 values (40, '4', 5);
insert into fkeys2 values (50, '5', 3);
-- no key in pkeys
insert into fkeys2 values (70, '5', 3);

insert into fkeys values (10, '1', 2);
insert into fkeys values (30, '3', 3);
insert into fkeys values (40, '4', 2);
insert into fkeys values (50, '5', 2);
-- no key in pkeys
insert into fkeys values (70, '5', 1);
-- no key in fkeys2
insert into fkeys values (60, '6', 4);

delete from pkeys where pkey1 = 30 and pkey2 = '3';
delete from pkeys where pkey1 = 40 and pkey2 = '4';
update pkeys set pkey1 = 7, pkey2 = '70' where pkey1 = 50 and pkey2 = '5';
update pkeys set pkey1 = 7, pkey2 = '70' where pkey1 = 10 and pkey2 = '1';

SELECT trigger_name, event_manipulation, event_object_schema, event_object_table,
       action_order, action_condition, action_orientation, action_timing,
       action_reference_old_table, action_reference_new_table
  FROM information_schema.triggers
  WHERE event_object_table in ('pkeys', 'fkeys', 'fkeys2')
  ORDER BY trigger_name COLLATE "C", 2;

DROP TABLE pkeys;
DROP TABLE fkeys;
DROP TABLE fkeys2;