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--
-- TRANSACTIONS
--
BEGIN;
SELECT *
INTO TABLE xacttest
FROM aggtest;
INSERT INTO xacttest (a, b) VALUES (777, 777.777);
END;
-- should retrieve one value--
SELECT a FROM xacttest WHERE a > 100;
BEGIN;
CREATE TABLE disappear (a int4);
DELETE FROM aggtest;
-- should be empty
SELECT * FROM aggtest;
ABORT;
-- should not exist
SELECT oid FROM pg_class WHERE relname = 'disappear';
-- should have members again
SELECT * FROM aggtest;
-- Read-only tests
CREATE TABLE writetest (a int);
CREATE TEMPORARY TABLE temptest (a int);
SET SESSION CHARACTERISTICS AS TRANSACTION READ ONLY;
DROP TABLE writetest; -- fail
INSERT INTO writetest VALUES (1); -- fail
SELECT * FROM writetest; -- ok
DELETE FROM temptest; -- ok
UPDATE temptest SET a = 0 WHERE a = 1 AND writetest.a = temptest.a; -- ok
PREPARE test AS UPDATE writetest SET a = 0; -- ok
EXECUTE test; -- fail
SELECT * FROM writetest, temptest; -- ok
CREATE TABLE test AS SELECT * FROM writetest; -- fail
START TRANSACTION READ WRITE;
DROP TABLE writetest; -- ok
COMMIT;
-- Subtransactions, basic tests
-- create & drop tables
SET SESSION CHARACTERISTICS AS TRANSACTION READ WRITE;
CREATE TABLE foobar (a int);
BEGIN;
CREATE TABLE foo (a int);
SAVEPOINT one;
DROP TABLE foo;
CREATE TABLE bar (a int);
ROLLBACK TO SAVEPOINT one;
RELEASE SAVEPOINT one;
SAVEPOINT two;
CREATE TABLE baz (a int);
RELEASE SAVEPOINT two;
drop TABLE foobar;
CREATE TABLE barbaz (a int);
COMMIT;
-- should exist: barbaz, baz, foo
SELECT * FROM foo; -- should be empty
SELECT * FROM bar; -- shouldn't exist
SELECT * FROM barbaz; -- should be empty
SELECT * FROM baz; -- should be empty
-- inserts
BEGIN;
INSERT INTO foo VALUES (1);
SAVEPOINT one;
INSERT into bar VALUES (1);
ROLLBACK TO one;
RELEASE SAVEPOINT one;
SAVEPOINT two;
INSERT into barbaz VALUES (1);
RELEASE two;
SAVEPOINT three;
SAVEPOINT four;
INSERT INTO foo VALUES (2);
RELEASE SAVEPOINT four;
ROLLBACK TO SAVEPOINT three;
RELEASE SAVEPOINT three;
INSERT INTO foo VALUES (3);
COMMIT;
SELECT * FROM foo; -- should have 1 and 3
SELECT * FROM barbaz; -- should have 1
-- test whole-tree commit
BEGIN;
SAVEPOINT one;
SELECT foo;
ROLLBACK TO SAVEPOINT one;
RELEASE SAVEPOINT one;
SAVEPOINT two;
CREATE TABLE savepoints (a int);
SAVEPOINT three;
INSERT INTO savepoints VALUES (1);
SAVEPOINT four;
INSERT INTO savepoints VALUES (2);
SAVEPOINT five;
INSERT INTO savepoints VALUES (3);
ROLLBACK TO SAVEPOINT five;
COMMIT;
COMMIT; -- should not be in a transaction block
SELECT * FROM savepoints;
-- test whole-tree rollback
BEGIN;
SAVEPOINT one;
DELETE FROM savepoints WHERE a=1;
RELEASE SAVEPOINT one;
SAVEPOINT two;
DELETE FROM savepoints WHERE a=1;
SAVEPOINT three;
DELETE FROM savepoints WHERE a=2;
ROLLBACK;
COMMIT; -- should not be in a transaction block
SELECT * FROM savepoints;
-- test whole-tree commit on an aborted subtransaction
BEGIN;
INSERT INTO savepoints VALUES (4);
SAVEPOINT one;
INSERT INTO savepoints VALUES (5);
SELECT foo;
COMMIT;
SELECT * FROM savepoints;
BEGIN;
INSERT INTO savepoints VALUES (6);
SAVEPOINT one;
INSERT INTO savepoints VALUES (7);
RELEASE SAVEPOINT one;
INSERT INTO savepoints VALUES (8);
COMMIT;
-- rows 6 and 8 should have been created by the same xact
SELECT a.xmin = b.xmin FROM savepoints a, savepoints b WHERE a.a=6 AND b.a=8;
-- rows 6 and 7 should have been created by different xacts
SELECT a.xmin = b.xmin FROM savepoints a, savepoints b WHERE a.a=6 AND b.a=7;
BEGIN;
INSERT INTO savepoints VALUES (9);
SAVEPOINT one;
INSERT INTO savepoints VALUES (10);
ROLLBACK TO SAVEPOINT one;
INSERT INTO savepoints VALUES (11);
COMMIT;
SELECT a FROM savepoints WHERE a in (9, 10, 11);
-- rows 9 and 11 should have been created by different xacts
SELECT a.xmin = b.xmin FROM savepoints a, savepoints b WHERE a.a=9 AND b.a=11;
BEGIN;
INSERT INTO savepoints VALUES (12);
SAVEPOINT one;
INSERT INTO savepoints VALUES (13);
SAVEPOINT two;
INSERT INTO savepoints VALUES (14);
ROLLBACK TO SAVEPOINT one;
INSERT INTO savepoints VALUES (15);
SAVEPOINT two;
INSERT INTO savepoints VALUES (16);
SAVEPOINT three;
INSERT INTO savepoints VALUES (17);
COMMIT;
SELECT a FROM savepoints WHERE a BETWEEN 12 AND 17;
BEGIN;
INSERT INTO savepoints VALUES (18);
SAVEPOINT one;
INSERT INTO savepoints VALUES (19);
SAVEPOINT two;
INSERT INTO savepoints VALUES (20);
ROLLBACK TO SAVEPOINT one;
INSERT INTO savepoints VALUES (21);
ROLLBACK TO SAVEPOINT one;
INSERT INTO savepoints VALUES (22);
COMMIT;
SELECT a FROM savepoints WHERE a BETWEEN 18 AND 22;
DROP TABLE savepoints;
-- only in a transaction block:
SAVEPOINT one;
ROLLBACK TO SAVEPOINT one;
RELEASE SAVEPOINT one;
-- Only "rollback to" allowed in aborted state
BEGIN;
SAVEPOINT one;
SELECT 0/0;
SAVEPOINT two; -- ignored till the end of ...
RELEASE SAVEPOINT one; -- ignored till the end of ...
ROLLBACK TO SAVEPOINT one;
SELECT 1;
COMMIT;
SELECT 1; -- this should work
-- check non-transactional behavior of cursors
BEGIN;
DECLARE c CURSOR FOR SELECT unique2 FROM tenk1;
SAVEPOINT one;
FETCH 10 FROM c;
ROLLBACK TO SAVEPOINT one;
FETCH 10 FROM c;
RELEASE SAVEPOINT one;
FETCH 10 FROM c;
CLOSE c;
DECLARE c CURSOR FOR SELECT unique2/0 FROM tenk1;
SAVEPOINT two;
FETCH 10 FROM c;
ROLLBACK TO SAVEPOINT two;
-- c is now dead to the world ...
FETCH 10 FROM c;
ROLLBACK TO SAVEPOINT two;
RELEASE SAVEPOINT two;
FETCH 10 FROM c;
COMMIT;
--
-- Check that "stable" functions are really stable. They should not be
-- able to see the partial results of the calling query. (Ideally we would
-- also check that they don't see commits of concurrent transactions, but
-- that's a mite hard to do within the limitations of pg_regress.)
--
select * from xacttest;
create or replace function max_xacttest() returns smallint language sql as
'select max(a) from xacttest' stable;
begin;
update xacttest set a = max_xacttest() + 10 where a > 0;
select * from xacttest;
rollback;
-- But a volatile function can see the partial results of the calling query
create or replace function max_xacttest() returns smallint language sql as
'select max(a) from xacttest' volatile;
begin;
update xacttest set a = max_xacttest() + 10 where a > 0;
select * from xacttest;
rollback;
-- Now the same test with plpgsql (since it depends on SPI which is different)
create or replace function max_xacttest() returns smallint language plpgsql as
'begin return max(a) from xacttest; end' stable;
begin;
update xacttest set a = max_xacttest() + 10 where a > 0;
select * from xacttest;
rollback;
create or replace function max_xacttest() returns smallint language plpgsql as
'begin return max(a) from xacttest; end' volatile;
begin;
update xacttest set a = max_xacttest() + 10 where a > 0;
select * from xacttest;
rollback;
-- test case for problems with dropping an open relation during abort
BEGIN;
savepoint x;
CREATE TABLE koju (a INT UNIQUE);
INSERT INTO koju VALUES (1);
INSERT INTO koju VALUES (1);
rollback to x;
CREATE TABLE koju (a INT UNIQUE);
INSERT INTO koju VALUES (1);
INSERT INTO koju VALUES (1);
ROLLBACK;
DROP TABLE foo;
DROP TABLE baz;
DROP TABLE barbaz;
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