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b2c4071299
mode see a fresh snapshot for each command in the function, rather than using the latest interactive command's snapshot. Also, suppress fresh snapshots as well as CommandCounterIncrement inside STABLE and IMMUTABLE functions, instead using the snapshot taken for the most closely nested regular query. (This behavior is only sane for read-only functions, so the patch also enforces that such functions contain only SELECT commands.) As per my proposal of 6-Sep-2004; I note that I floated essentially the same proposal on 19-Jun-2002, but that discussion tailed off without any action. Since 8.0 seems like the right place to be taking possibly nontrivial backwards compatibility hits, let's get it done now.
293 lines
7.1 KiB
PL/PgSQL
293 lines
7.1 KiB
PL/PgSQL
--
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-- TRANSACTIONS
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--
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BEGIN;
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SELECT *
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INTO TABLE xacttest
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FROM aggtest;
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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 aggtest;
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-- should be empty
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SELECT * FROM aggtest;
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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 aggtest;
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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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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 WHERE 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 foobar (a int);
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BEGIN;
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CREATE TABLE foo (a int);
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SAVEPOINT one;
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DROP TABLE foo;
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CREATE TABLE 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 baz (a int);
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RELEASE SAVEPOINT two;
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drop TABLE foobar;
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CREATE TABLE barbaz (a int);
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COMMIT;
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-- should exist: barbaz, baz, foo
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SELECT * FROM foo; -- should be empty
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SELECT * FROM bar; -- shouldn't exist
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SELECT * FROM barbaz; -- should be empty
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SELECT * FROM baz; -- should be empty
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-- inserts
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BEGIN;
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INSERT INTO foo VALUES (1);
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SAVEPOINT one;
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INSERT into 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 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 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 foo VALUES (3);
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COMMIT;
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SELECT * FROM foo; -- should have 1 and 3
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SELECT * FROM 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 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 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;
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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;
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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 foo;
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DROP TABLE baz;
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DROP TABLE barbaz;
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