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48e2b234f8
In older branches, COMMIT/ROLLBACK AND CHAIN failed to propagate the current transaction's properties to the new transaction if there was any open subtransaction (unreleased savepoint). Instead, some previous transaction's properties would be restored. This is because the "if (s->chain)" check in CommitTransactionCommand examined the wrong instance of the "chain" flag and falsely concluded that it didn't need to save transaction properties. Our regression tests would have noticed this, except they used identical transaction properties for multiple tests in a row, so that the faulty behavior was not distinguishable from correct behavior. Commit 12d768e70 fixed the problem in v15 and later, but only rather accidentally, because I removed the "if (s->chain)" test to avoid a compiler warning, while not realizing that the warning was flagging a real bug. In v14 and before, remove the if-test and save transaction properties unconditionally; just as in the newer branches, that's not expensive enough to justify thinking harder. Add the comment and extra regression test to v15 and later to forestall any future recurrence, but there's no live bug in those branches. Patch by me, per bug #18118 from Liu Xiang. Back-patch to v12 where the AND CHAIN feature was added. Discussion: https://postgr.es/m/18118-4b72fcbb903aace6@postgresql.org
645 lines
18 KiB
PL/PgSQL
645 lines
18 KiB
PL/PgSQL
--
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-- TRANSACTIONS
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--
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BEGIN;
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CREATE TABLE xacttest (a smallint, b real);
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INSERT INTO xacttest VALUES
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(56, 7.8),
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(100, 99.097),
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(0, 0.09561),
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(42, 324.78);
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INSERT INTO xacttest (a, b) VALUES (777, 777.777);
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END;
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-- should retrieve one value--
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SELECT a FROM xacttest WHERE a > 100;
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BEGIN;
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CREATE TABLE disappear (a int4);
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DELETE FROM xacttest;
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-- should be empty
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SELECT * FROM xacttest;
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ABORT;
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-- should not exist
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SELECT oid FROM pg_class WHERE relname = 'disappear';
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-- should have members again
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SELECT * FROM xacttest;
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-- Test that transaction characteristics cannot be reset.
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BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
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SELECT COUNT(*) FROM xacttest;
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RESET transaction_isolation; -- error
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END;
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BEGIN TRANSACTION READ ONLY;
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SELECT COUNT(*) FROM xacttest;
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RESET transaction_read_only; -- error
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END;
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BEGIN TRANSACTION DEFERRABLE;
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SELECT COUNT(*) FROM xacttest;
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RESET transaction_deferrable; -- error
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END;
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CREATE FUNCTION errfunc() RETURNS int LANGUAGE SQL AS 'SELECT 1'
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SET transaction_read_only = on; -- error
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-- Read-only tests
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CREATE TABLE writetest (a int);
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CREATE TEMPORARY TABLE temptest (a int);
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BEGIN;
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SET TRANSACTION ISOLATION LEVEL SERIALIZABLE, READ ONLY, DEFERRABLE; -- ok
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SELECT * FROM writetest; -- ok
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SET TRANSACTION READ WRITE; --fail
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COMMIT;
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BEGIN;
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SET TRANSACTION READ ONLY; -- ok
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SET TRANSACTION READ WRITE; -- ok
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SET TRANSACTION READ ONLY; -- ok
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SELECT * FROM writetest; -- ok
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SAVEPOINT x;
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SET TRANSACTION READ ONLY; -- ok
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SELECT * FROM writetest; -- ok
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SET TRANSACTION READ ONLY; -- ok
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SET TRANSACTION READ WRITE; --fail
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COMMIT;
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BEGIN;
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SET TRANSACTION READ WRITE; -- ok
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SAVEPOINT x;
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SET TRANSACTION READ WRITE; -- ok
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SET TRANSACTION READ ONLY; -- ok
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SELECT * FROM writetest; -- ok
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SET TRANSACTION READ ONLY; -- ok
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SET TRANSACTION READ WRITE; --fail
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COMMIT;
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BEGIN;
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SET TRANSACTION READ WRITE; -- ok
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SAVEPOINT x;
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SET TRANSACTION READ ONLY; -- ok
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SELECT * FROM writetest; -- ok
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ROLLBACK TO SAVEPOINT x;
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SHOW transaction_read_only; -- off
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SAVEPOINT y;
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SET TRANSACTION READ ONLY; -- ok
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SELECT * FROM writetest; -- ok
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RELEASE SAVEPOINT y;
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SHOW transaction_read_only; -- off
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COMMIT;
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SET SESSION CHARACTERISTICS AS TRANSACTION READ ONLY;
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DROP TABLE writetest; -- fail
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INSERT INTO writetest VALUES (1); -- fail
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SELECT * FROM writetest; -- ok
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DELETE FROM temptest; -- ok
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UPDATE temptest SET a = 0 FROM writetest WHERE temptest.a = 1 AND writetest.a = temptest.a; -- ok
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PREPARE test AS UPDATE writetest SET a = 0; -- ok
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EXECUTE test; -- fail
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SELECT * FROM writetest, temptest; -- ok
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CREATE TABLE test AS SELECT * FROM writetest; -- fail
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START TRANSACTION READ WRITE;
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DROP TABLE writetest; -- ok
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COMMIT;
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-- Subtransactions, basic tests
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-- create & drop tables
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SET SESSION CHARACTERISTICS AS TRANSACTION READ WRITE;
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CREATE TABLE trans_foobar (a int);
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BEGIN;
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CREATE TABLE trans_foo (a int);
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SAVEPOINT one;
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DROP TABLE trans_foo;
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CREATE TABLE trans_bar (a int);
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ROLLBACK TO SAVEPOINT one;
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RELEASE SAVEPOINT one;
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SAVEPOINT two;
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CREATE TABLE trans_baz (a int);
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RELEASE SAVEPOINT two;
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drop TABLE trans_foobar;
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CREATE TABLE trans_barbaz (a int);
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COMMIT;
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-- should exist: trans_barbaz, trans_baz, trans_foo
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SELECT * FROM trans_foo; -- should be empty
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SELECT * FROM trans_bar; -- shouldn't exist
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SELECT * FROM trans_barbaz; -- should be empty
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SELECT * FROM trans_baz; -- should be empty
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-- inserts
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BEGIN;
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INSERT INTO trans_foo VALUES (1);
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SAVEPOINT one;
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INSERT into trans_bar VALUES (1);
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ROLLBACK TO one;
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RELEASE SAVEPOINT one;
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SAVEPOINT two;
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INSERT into trans_barbaz VALUES (1);
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RELEASE two;
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SAVEPOINT three;
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SAVEPOINT four;
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INSERT INTO trans_foo VALUES (2);
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RELEASE SAVEPOINT four;
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ROLLBACK TO SAVEPOINT three;
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RELEASE SAVEPOINT three;
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INSERT INTO trans_foo VALUES (3);
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COMMIT;
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SELECT * FROM trans_foo; -- should have 1 and 3
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SELECT * FROM trans_barbaz; -- should have 1
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-- test whole-tree commit
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BEGIN;
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SAVEPOINT one;
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SELECT trans_foo;
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ROLLBACK TO SAVEPOINT one;
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RELEASE SAVEPOINT one;
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SAVEPOINT two;
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CREATE TABLE savepoints (a int);
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SAVEPOINT three;
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INSERT INTO savepoints VALUES (1);
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SAVEPOINT four;
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INSERT INTO savepoints VALUES (2);
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SAVEPOINT five;
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INSERT INTO savepoints VALUES (3);
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ROLLBACK TO SAVEPOINT five;
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COMMIT;
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COMMIT; -- should not be in a transaction block
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SELECT * FROM savepoints;
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-- test whole-tree rollback
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BEGIN;
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SAVEPOINT one;
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DELETE FROM savepoints WHERE a=1;
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RELEASE SAVEPOINT one;
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SAVEPOINT two;
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DELETE FROM savepoints WHERE a=1;
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SAVEPOINT three;
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DELETE FROM savepoints WHERE a=2;
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ROLLBACK;
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COMMIT; -- should not be in a transaction block
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SELECT * FROM savepoints;
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-- test whole-tree commit on an aborted subtransaction
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BEGIN;
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INSERT INTO savepoints VALUES (4);
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SAVEPOINT one;
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INSERT INTO savepoints VALUES (5);
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SELECT trans_foo;
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COMMIT;
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SELECT * FROM savepoints;
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BEGIN;
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INSERT INTO savepoints VALUES (6);
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SAVEPOINT one;
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INSERT INTO savepoints VALUES (7);
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RELEASE SAVEPOINT one;
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INSERT INTO savepoints VALUES (8);
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COMMIT;
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-- rows 6 and 8 should have been created by the same xact
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SELECT a.xmin = b.xmin FROM savepoints a, savepoints b WHERE a.a=6 AND b.a=8;
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-- rows 6 and 7 should have been created by different xacts
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SELECT a.xmin = b.xmin FROM savepoints a, savepoints b WHERE a.a=6 AND b.a=7;
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BEGIN;
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INSERT INTO savepoints VALUES (9);
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SAVEPOINT one;
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INSERT INTO savepoints VALUES (10);
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ROLLBACK TO SAVEPOINT one;
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INSERT INTO savepoints VALUES (11);
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COMMIT;
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SELECT a FROM savepoints WHERE a in (9, 10, 11);
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-- rows 9 and 11 should have been created by different xacts
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SELECT a.xmin = b.xmin FROM savepoints a, savepoints b WHERE a.a=9 AND b.a=11;
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BEGIN;
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INSERT INTO savepoints VALUES (12);
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SAVEPOINT one;
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INSERT INTO savepoints VALUES (13);
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SAVEPOINT two;
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INSERT INTO savepoints VALUES (14);
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ROLLBACK TO SAVEPOINT one;
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INSERT INTO savepoints VALUES (15);
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SAVEPOINT two;
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INSERT INTO savepoints VALUES (16);
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SAVEPOINT three;
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INSERT INTO savepoints VALUES (17);
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COMMIT;
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SELECT a FROM savepoints WHERE a BETWEEN 12 AND 17;
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BEGIN;
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INSERT INTO savepoints VALUES (18);
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SAVEPOINT one;
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INSERT INTO savepoints VALUES (19);
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SAVEPOINT two;
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INSERT INTO savepoints VALUES (20);
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ROLLBACK TO SAVEPOINT one;
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INSERT INTO savepoints VALUES (21);
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ROLLBACK TO SAVEPOINT one;
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INSERT INTO savepoints VALUES (22);
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COMMIT;
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SELECT a FROM savepoints WHERE a BETWEEN 18 AND 22;
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DROP TABLE savepoints;
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-- only in a transaction block:
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SAVEPOINT one;
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ROLLBACK TO SAVEPOINT one;
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RELEASE SAVEPOINT one;
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-- Only "rollback to" allowed in aborted state
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BEGIN;
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SAVEPOINT one;
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SELECT 0/0;
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SAVEPOINT two; -- ignored till the end of ...
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RELEASE SAVEPOINT one; -- ignored till the end of ...
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ROLLBACK TO SAVEPOINT one;
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SELECT 1;
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COMMIT;
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SELECT 1; -- this should work
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-- check non-transactional behavior of cursors
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BEGIN;
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DECLARE c CURSOR FOR SELECT unique2 FROM tenk1 ORDER BY unique2;
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SAVEPOINT one;
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FETCH 10 FROM c;
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ROLLBACK TO SAVEPOINT one;
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FETCH 10 FROM c;
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RELEASE SAVEPOINT one;
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FETCH 10 FROM c;
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CLOSE c;
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DECLARE c CURSOR FOR SELECT unique2/0 FROM tenk1 ORDER BY unique2;
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SAVEPOINT two;
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FETCH 10 FROM c;
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ROLLBACK TO SAVEPOINT two;
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-- c is now dead to the world ...
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FETCH 10 FROM c;
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ROLLBACK TO SAVEPOINT two;
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RELEASE SAVEPOINT two;
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FETCH 10 FROM c;
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COMMIT;
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--
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-- Check that "stable" functions are really stable. They should not be
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-- able to see the partial results of the calling query. (Ideally we would
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-- also check that they don't see commits of concurrent transactions, but
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-- that's a mite hard to do within the limitations of pg_regress.)
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--
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select * from xacttest;
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create or replace function max_xacttest() returns smallint language sql as
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'select max(a) from xacttest' stable;
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begin;
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update xacttest set a = max_xacttest() + 10 where a > 0;
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select * from xacttest;
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rollback;
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-- But a volatile function can see the partial results of the calling query
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create or replace function max_xacttest() returns smallint language sql as
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'select max(a) from xacttest' volatile;
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begin;
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update xacttest set a = max_xacttest() + 10 where a > 0;
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select * from xacttest;
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rollback;
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-- Now the same test with plpgsql (since it depends on SPI which is different)
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create or replace function max_xacttest() returns smallint language plpgsql as
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'begin return max(a) from xacttest; end' stable;
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begin;
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update xacttest set a = max_xacttest() + 10 where a > 0;
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select * from xacttest;
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rollback;
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create or replace function max_xacttest() returns smallint language plpgsql as
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'begin return max(a) from xacttest; end' volatile;
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begin;
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update xacttest set a = max_xacttest() + 10 where a > 0;
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select * from xacttest;
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rollback;
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-- test case for problems with dropping an open relation during abort
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BEGIN;
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savepoint x;
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CREATE TABLE koju (a INT UNIQUE);
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INSERT INTO koju VALUES (1);
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INSERT INTO koju VALUES (1);
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rollback to x;
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CREATE TABLE koju (a INT UNIQUE);
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INSERT INTO koju VALUES (1);
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INSERT INTO koju VALUES (1);
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ROLLBACK;
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DROP TABLE trans_foo;
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DROP TABLE trans_baz;
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DROP TABLE trans_barbaz;
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-- test case for problems with revalidating an open relation during abort
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create function inverse(int) returns float8 as
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$$
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begin
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analyze revalidate_bug;
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return 1::float8/$1;
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exception
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when division_by_zero then return 0;
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end$$ language plpgsql volatile;
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create table revalidate_bug (c float8 unique);
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insert into revalidate_bug values (1);
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insert into revalidate_bug values (inverse(0));
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drop table revalidate_bug;
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drop function inverse(int);
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-- verify that cursors created during an aborted subtransaction are
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-- closed, but that we do not rollback the effect of any FETCHs
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-- performed in the aborted subtransaction
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begin;
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savepoint x;
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create table trans_abc (a int);
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insert into trans_abc values (5);
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insert into trans_abc values (10);
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declare foo cursor for select * from trans_abc;
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fetch from foo;
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rollback to x;
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-- should fail
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fetch from foo;
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commit;
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begin;
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create table trans_abc (a int);
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insert into trans_abc values (5);
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insert into trans_abc values (10);
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insert into trans_abc values (15);
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declare foo cursor for select * from trans_abc;
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fetch from foo;
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savepoint x;
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fetch from foo;
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rollback to x;
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fetch from foo;
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abort;
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-- Test for proper cleanup after a failure in a cursor portal
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-- that was created in an outer subtransaction
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CREATE FUNCTION invert(x float8) RETURNS float8 LANGUAGE plpgsql AS
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$$ begin return 1/x; end $$;
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CREATE FUNCTION create_temp_tab() RETURNS text
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LANGUAGE plpgsql AS $$
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BEGIN
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CREATE TEMP TABLE new_table (f1 float8);
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-- case of interest is that we fail while holding an open
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-- relcache reference to new_table
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INSERT INTO new_table SELECT invert(0.0);
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RETURN 'foo';
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END $$;
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BEGIN;
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DECLARE ok CURSOR FOR SELECT * FROM int8_tbl;
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DECLARE ctt CURSOR FOR SELECT create_temp_tab();
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FETCH ok;
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SAVEPOINT s1;
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FETCH ok; -- should work
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FETCH ctt; -- error occurs here
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ROLLBACK TO s1;
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FETCH ok; -- should work
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FETCH ctt; -- must be rejected
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COMMIT;
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DROP FUNCTION create_temp_tab();
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DROP FUNCTION invert(x float8);
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-- Tests for AND CHAIN
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CREATE TABLE trans_abc (a int);
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-- set nondefault value so we have something to override below
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SET default_transaction_read_only = on;
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START TRANSACTION ISOLATION LEVEL REPEATABLE READ, READ WRITE, DEFERRABLE;
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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INSERT INTO trans_abc VALUES (1);
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INSERT INTO trans_abc VALUES (2);
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COMMIT AND CHAIN; -- TBLOCK_END
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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INSERT INTO trans_abc VALUES ('error');
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INSERT INTO trans_abc VALUES (3); -- check it's really aborted
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COMMIT AND CHAIN; -- TBLOCK_ABORT_END
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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INSERT INTO trans_abc VALUES (4);
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COMMIT;
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START TRANSACTION ISOLATION LEVEL REPEATABLE READ, READ WRITE, DEFERRABLE;
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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SAVEPOINT x;
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INSERT INTO trans_abc VALUES ('error');
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COMMIT AND CHAIN; -- TBLOCK_ABORT_PENDING
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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INSERT INTO trans_abc VALUES (5);
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COMMIT;
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START TRANSACTION ISOLATION LEVEL REPEATABLE READ, READ WRITE, DEFERRABLE;
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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SAVEPOINT x;
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COMMIT AND CHAIN; -- TBLOCK_SUBCOMMIT
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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COMMIT;
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START TRANSACTION ISOLATION LEVEL READ COMMITTED, READ WRITE, DEFERRABLE;
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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SAVEPOINT x;
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COMMIT AND CHAIN; -- TBLOCK_SUBCOMMIT
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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COMMIT;
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-- different mix of options just for fun
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START TRANSACTION ISOLATION LEVEL SERIALIZABLE, READ WRITE, NOT DEFERRABLE;
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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INSERT INTO trans_abc VALUES (6);
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ROLLBACK AND CHAIN; -- TBLOCK_ABORT_PENDING
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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INSERT INTO trans_abc VALUES ('error');
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ROLLBACK AND CHAIN; -- TBLOCK_ABORT_END
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SHOW transaction_isolation;
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SHOW transaction_read_only;
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SHOW transaction_deferrable;
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ROLLBACK;
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-- not allowed outside a transaction block
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COMMIT AND CHAIN; -- error
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ROLLBACK AND CHAIN; -- error
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SELECT * FROM trans_abc ORDER BY 1;
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RESET default_transaction_read_only;
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DROP TABLE trans_abc;
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-- Test assorted behaviors around the implicit transaction block created
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-- when multiple SQL commands are sent in a single Query message. These
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-- tests rely on the fact that psql will not break SQL commands apart at a
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-- backslash-quoted semicolon, but will send them as one Query.
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create temp table i_table (f1 int);
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-- psql will show all results of a multi-statement Query
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SELECT 1\; SELECT 2\; SELECT 3;
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-- this implicitly commits:
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insert into i_table values(1)\; select * from i_table;
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-- 1/0 error will cause rolling back the whole implicit transaction
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insert into i_table values(2)\; select * from i_table\; select 1/0;
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select * from i_table;
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rollback; -- we are not in a transaction at this point
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-- can use regular begin/commit/rollback within a single Query
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begin\; insert into i_table values(3)\; commit;
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rollback; -- we are not in a transaction at this point
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begin\; insert into i_table values(4)\; rollback;
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rollback; -- we are not in a transaction at this point
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-- begin converts implicit transaction into a regular one that
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-- can extend past the end of the Query
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select 1\; begin\; insert into i_table values(5);
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commit;
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select 1\; begin\; insert into i_table values(6);
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rollback;
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-- commit in implicit-transaction state commits but issues a warning.
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insert into i_table values(7)\; commit\; insert into i_table values(8)\; select 1/0;
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-- similarly, rollback aborts but issues a warning.
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insert into i_table values(9)\; rollback\; select 2;
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select * from i_table;
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rollback; -- we are not in a transaction at this point
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-- implicit transaction block is still a transaction block, for e.g. VACUUM
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SELECT 1\; VACUUM;
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SELECT 1\; COMMIT\; VACUUM;
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-- we disallow savepoint-related commands in implicit-transaction state
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SELECT 1\; SAVEPOINT sp;
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SELECT 1\; COMMIT\; SAVEPOINT sp;
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ROLLBACK TO SAVEPOINT sp\; SELECT 2;
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SELECT 2\; RELEASE SAVEPOINT sp\; SELECT 3;
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-- but this is OK, because the BEGIN converts it to a regular xact
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SELECT 1\; BEGIN\; SAVEPOINT sp\; ROLLBACK TO SAVEPOINT sp\; COMMIT;
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-- Tests for AND CHAIN in implicit transaction blocks
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SET TRANSACTION READ ONLY\; COMMIT AND CHAIN; -- error
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SHOW transaction_read_only;
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SET TRANSACTION READ ONLY\; ROLLBACK AND CHAIN; -- error
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SHOW transaction_read_only;
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CREATE TABLE trans_abc (a int);
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-- COMMIT/ROLLBACK + COMMIT/ROLLBACK AND CHAIN
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INSERT INTO trans_abc VALUES (7)\; COMMIT\; INSERT INTO trans_abc VALUES (8)\; COMMIT AND CHAIN; -- 7 commit, 8 error
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INSERT INTO trans_abc VALUES (9)\; ROLLBACK\; INSERT INTO trans_abc VALUES (10)\; ROLLBACK AND CHAIN; -- 9 rollback, 10 error
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-- COMMIT/ROLLBACK AND CHAIN + COMMIT/ROLLBACK
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INSERT INTO trans_abc VALUES (11)\; COMMIT AND CHAIN\; INSERT INTO trans_abc VALUES (12)\; COMMIT; -- 11 error, 12 not reached
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INSERT INTO trans_abc VALUES (13)\; ROLLBACK AND CHAIN\; INSERT INTO trans_abc VALUES (14)\; ROLLBACK; -- 13 error, 14 not reached
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-- START TRANSACTION + COMMIT/ROLLBACK AND CHAIN
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START TRANSACTION ISOLATION LEVEL REPEATABLE READ\; INSERT INTO trans_abc VALUES (15)\; COMMIT AND CHAIN; -- 15 ok
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SHOW transaction_isolation; -- transaction is active at this point
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COMMIT;
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START TRANSACTION ISOLATION LEVEL REPEATABLE READ\; INSERT INTO trans_abc VALUES (16)\; ROLLBACK AND CHAIN; -- 16 ok
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SHOW transaction_isolation; -- transaction is active at this point
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ROLLBACK;
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SET default_transaction_isolation = 'read committed';
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-- START TRANSACTION + COMMIT/ROLLBACK + COMMIT/ROLLBACK AND CHAIN
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START TRANSACTION ISOLATION LEVEL REPEATABLE READ\; INSERT INTO trans_abc VALUES (17)\; COMMIT\; INSERT INTO trans_abc VALUES (18)\; COMMIT AND CHAIN; -- 17 commit, 18 error
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SHOW transaction_isolation; -- out of transaction block
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START TRANSACTION ISOLATION LEVEL REPEATABLE READ\; INSERT INTO trans_abc VALUES (19)\; ROLLBACK\; INSERT INTO trans_abc VALUES (20)\; ROLLBACK AND CHAIN; -- 19 rollback, 20 error
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SHOW transaction_isolation; -- out of transaction block
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|
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RESET default_transaction_isolation;
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|
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SELECT * FROM trans_abc ORDER BY 1;
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|
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DROP TABLE trans_abc;
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|
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-- TRANSACTION SNAPSHOT
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-- Incorrect identifier.
|
|
BEGIN TRANSACTION ISOLATION LEVEL REPEATABLE READ;
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|
SET TRANSACTION SNAPSHOT 'Incorrect Identifier';
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|
ROLLBACK;
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|
-- Correct identifier, missing file.
|
|
BEGIN TRANSACTION ISOLATION LEVEL REPEATABLE READ;
|
|
SET TRANSACTION SNAPSHOT 'FFF-FFF-F';
|
|
ROLLBACK;
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|
|
|
-- Test for successful cleanup of an aborted transaction at session exit.
|
|
-- THIS MUST BE THE LAST TEST IN THIS FILE.
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|
|
|
begin;
|
|
select 1/0;
|
|
rollback to X;
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-- DO NOT ADD ANYTHING HERE.
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