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postgresql/src/test/regress/sql/transactions.sql
Tom Lane 2cf8c7aa48 Clean up duplicate table and function names in regression tests. 
Many of the objects we create during the regression tests are put in the
public schema, so that using the same names in different regression tests
creates a hazard of test failures if any two such scripts run concurrently.
This patch cleans up a bunch of latent hazards of that sort, as well as two
live hazards.

The current situation in this regard is far worse than it was a year or two
back, because practically all of the partitioning-related test cases have
reused table names with enthusiasm.  I despaired of cleaning up that mess
within the five most-affected tests (create_table, alter_table, insert,
update, inherit); fortunately those don't run concurrently.

Other than partitioning problems, most of the issues boil down to using
names like "foo", "bar", "tmp", etc, without thought for the fact that
other test scripts might use similar names concurrently.  I've made an
effort to make all such names more specific.

One of the live hazards was that commit 7421f4b8 caused with.sql to
create a table named "test", conflicting with a similarly-named table
in alter_table.sql; this was exposed in the buildfarm recently.
The other one was that join.sql and transactions.sql both create tables
named "foo" and "bar"; but join.sql's uses of those names date back
only to December or so.

Since commit 7421f4b8 was back-patched to v10, back-patch a minimal
fix for that problem.  The rest of this is just future-proofing.

Discussion: https://postgr.es/m/4627.1521070268@sss.pgh.pa.us
2018-03-15 17:09:02 -04:00

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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);
BEGIN;
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE, READ ONLY, DEFERRABLE; -- ok
SELECT * FROM writetest; -- ok
SET TRANSACTION READ WRITE; --fail
COMMIT;
BEGIN;
SET TRANSACTION READ ONLY; -- ok
SET TRANSACTION READ WRITE; -- ok
SET TRANSACTION READ ONLY; -- ok
SELECT * FROM writetest; -- ok
SAVEPOINT x;
SET TRANSACTION READ ONLY; -- ok
SELECT * FROM writetest; -- ok
SET TRANSACTION READ ONLY; -- ok
SET TRANSACTION READ WRITE; --fail
COMMIT;
BEGIN;
SET TRANSACTION READ WRITE; -- ok
SAVEPOINT x;
SET TRANSACTION READ WRITE; -- ok
SET TRANSACTION READ ONLY; -- ok
SELECT * FROM writetest; -- ok
SET TRANSACTION READ ONLY; -- ok
SET TRANSACTION READ WRITE; --fail
COMMIT;
BEGIN;
SET TRANSACTION READ WRITE; -- ok
SAVEPOINT x;
SET TRANSACTION READ ONLY; -- ok
SELECT * FROM writetest; -- ok
ROLLBACK TO SAVEPOINT x;
SHOW transaction_read_only; -- off
SAVEPOINT y;
SET TRANSACTION READ ONLY; -- ok
SELECT * FROM writetest; -- ok
RELEASE SAVEPOINT y;
SHOW transaction_read_only; -- off
COMMIT;
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 FROM writetest WHERE temptest.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 trans_foobar (a int);
BEGIN;
CREATE TABLE trans_foo (a int);
SAVEPOINT one;
DROP TABLE trans_foo;
CREATE TABLE trans_bar (a int);
ROLLBACK TO SAVEPOINT one;
RELEASE SAVEPOINT one;
SAVEPOINT two;
CREATE TABLE trans_baz (a int);
RELEASE SAVEPOINT two;
drop TABLE trans_foobar;
CREATE TABLE trans_barbaz (a int);
COMMIT;
-- should exist: trans_barbaz, trans_baz, trans_foo
SELECT * FROM trans_foo; -- should be empty
SELECT * FROM trans_bar; -- shouldn't exist
SELECT * FROM trans_barbaz; -- should be empty
SELECT * FROM trans_baz; -- should be empty
-- inserts
BEGIN;
INSERT INTO trans_foo VALUES (1);
SAVEPOINT one;
INSERT into trans_bar VALUES (1);
ROLLBACK TO one;
RELEASE SAVEPOINT one;
SAVEPOINT two;
INSERT into trans_barbaz VALUES (1);
RELEASE two;
SAVEPOINT three;
SAVEPOINT four;
INSERT INTO trans_foo VALUES (2);
RELEASE SAVEPOINT four;
ROLLBACK TO SAVEPOINT three;
RELEASE SAVEPOINT three;
INSERT INTO trans_foo VALUES (3);
COMMIT;
SELECT * FROM trans_foo; -- should have 1 and 3
SELECT * FROM trans_barbaz; -- should have 1
-- test whole-tree commit
BEGIN;
SAVEPOINT one;
SELECT trans_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 trans_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 ORDER BY unique2;
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 ORDER BY unique2;
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 trans_foo;
DROP TABLE trans_baz;
DROP TABLE trans_barbaz;
-- test case for problems with revalidating an open relation during abort
create function inverse(int) returns float8 as
$$
begin
analyze revalidate_bug;
return 1::float8/$1;
exception
when division_by_zero then return 0;
end$$ language plpgsql volatile;
create table revalidate_bug (c float8 unique);
insert into revalidate_bug values (1);
insert into revalidate_bug values (inverse(0));
drop table revalidate_bug;
drop function inverse(int);
-- verify that cursors created during an aborted subtransaction are
-- closed, but that we do not rollback the effect of any FETCHs
-- performed in the aborted subtransaction
begin;
savepoint x;
create table abc (a int);
insert into abc values (5);
insert into abc values (10);
declare foo cursor for select * from abc;
fetch from foo;
rollback to x;
-- should fail
fetch from foo;
commit;
begin;
create table abc (a int);
insert into abc values (5);
insert into abc values (10);
insert into abc values (15);
declare foo cursor for select * from abc;
fetch from foo;
savepoint x;
fetch from foo;
rollback to x;
fetch from foo;
abort;
-- Test for proper cleanup after a failure in a cursor portal
-- that was created in an outer subtransaction
CREATE FUNCTION invert(x float8) RETURNS float8 LANGUAGE plpgsql AS
$$ begin return 1/x; end $$;
CREATE FUNCTION create_temp_tab() RETURNS text
LANGUAGE plpgsql AS $$
BEGIN
CREATE TEMP TABLE new_table (f1 float8);
-- case of interest is that we fail while holding an open
-- relcache reference to new_table
INSERT INTO new_table SELECT invert(0.0);
RETURN 'foo';
END $$;
BEGIN;
DECLARE ok CURSOR FOR SELECT * FROM int8_tbl;
DECLARE ctt CURSOR FOR SELECT create_temp_tab();
FETCH ok;
SAVEPOINT s1;
FETCH ok; -- should work
FETCH ctt; -- error occurs here
ROLLBACK TO s1;
FETCH ok; -- should work
FETCH ctt; -- must be rejected
COMMIT;
DROP FUNCTION create_temp_tab();
DROP FUNCTION invert(x float8);
-- Test assorted behaviors around the implicit transaction block created
-- when multiple SQL commands are sent in a single Query message. These
-- tests rely on the fact that psql will not break SQL commands apart at a
-- backslash-quoted semicolon, but will send them as one Query.
create temp table i_table (f1 int);
-- psql will show only the last result in a multi-statement Query
SELECT 1\; SELECT 2\; SELECT 3;
-- this implicitly commits:
insert into i_table values(1)\; select * from i_table;
-- 1/0 error will cause rolling back the whole implicit transaction
insert into i_table values(2)\; select * from i_table\; select 1/0;
select * from i_table;
rollback; -- we are not in a transaction at this point
-- can use regular begin/commit/rollback within a single Query
begin\; insert into i_table values(3)\; commit;
rollback; -- we are not in a transaction at this point
begin\; insert into i_table values(4)\; rollback;
rollback; -- we are not in a transaction at this point
-- begin converts implicit transaction into a regular one that
-- can extend past the end of the Query
select 1\; begin\; insert into i_table values(5);
commit;
select 1\; begin\; insert into i_table values(6);
rollback;
-- commit in implicit-transaction state commits but issues a warning.
insert into i_table values(7)\; commit\; insert into i_table values(8)\; select 1/0;
-- similarly, rollback aborts but issues a warning.
insert into i_table values(9)\; rollback\; select 2;
select * from i_table;
rollback; -- we are not in a transaction at this point
-- implicit transaction block is still a transaction block, for e.g. VACUUM
SELECT 1\; VACUUM;
SELECT 1\; COMMIT\; VACUUM;
-- we disallow savepoint-related commands in implicit-transaction state
SELECT 1\; SAVEPOINT sp;
SELECT 1\; COMMIT\; SAVEPOINT sp;
ROLLBACK TO SAVEPOINT sp\; SELECT 2;
SELECT 2\; RELEASE SAVEPOINT sp\; SELECT 3;
-- but this is OK, because the BEGIN converts it to a regular xact
SELECT 1\; BEGIN\; SAVEPOINT sp\; ROLLBACK TO SAVEPOINT sp\; COMMIT;
-- Test for successful cleanup of an aborted transaction at session exit.
-- THIS MUST BE THE LAST TEST IN THIS FILE.
begin;
select 1/0;
rollback to X;
-- DO NOT ADD ANYTHING HERE.
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