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|
--
-- PREPARED TRANSACTIONS (two-phase commit)
--
-- We can't readily test persistence of prepared xacts within the
-- regression script framework, unfortunately. Note that a crash
-- isn't really needed ... stopping and starting the postmaster would
-- be enough, but we can't even do that here.
-- create a simple table that we'll use in the tests
CREATE TABLE pxtest1 (foobar VARCHAR(10));
INSERT INTO pxtest1 VALUES ('aaa');
-- Test PREPARE TRANSACTION
BEGIN;
UPDATE pxtest1 SET foobar = 'bbb' WHERE foobar = 'aaa';
SELECT * FROM pxtest1;
foobar
--------
bbb
(1 row)
PREPARE TRANSACTION 'foo1';
SELECT * FROM pxtest1;
foobar
--------
aaa
(1 row)
-- Test pg_prepared_xacts system view
SELECT gid FROM pg_prepared_xacts;
gid
------
foo1
(1 row)
-- Test ROLLBACK PREPARED
ROLLBACK PREPARED 'foo1';
SELECT * FROM pxtest1;
foobar
--------
aaa
(1 row)
SELECT gid FROM pg_prepared_xacts;
gid
-----
(0 rows)
-- Test COMMIT PREPARED
BEGIN;
INSERT INTO pxtest1 VALUES ('ddd');
SELECT * FROM pxtest1;
foobar
--------
aaa
ddd
(2 rows)
PREPARE TRANSACTION 'foo2';
SELECT * FROM pxtest1;
foobar
--------
aaa
(1 row)
COMMIT PREPARED 'foo2';
SELECT * FROM pxtest1;
foobar
--------
aaa
ddd
(2 rows)
-- Test duplicate gids
BEGIN;
UPDATE pxtest1 SET foobar = 'eee' WHERE foobar = 'ddd';
SELECT * FROM pxtest1;
foobar
--------
aaa
eee
(2 rows)
PREPARE TRANSACTION 'foo3';
SELECT gid FROM pg_prepared_xacts;
gid
------
foo3
(1 row)
BEGIN;
INSERT INTO pxtest1 VALUES ('fff');
SELECT * FROM pxtest1;
foobar
--------
aaa
ddd
fff
(3 rows)
-- This should fail, because the gid foo3 is already in use
PREPARE TRANSACTION 'foo3';
ERROR: global transaction identifier "foo3" is already in use
SELECT * FROM pxtest1;
foobar
--------
aaa
ddd
(2 rows)
ROLLBACK PREPARED 'foo3';
SELECT * FROM pxtest1;
foobar
--------
aaa
ddd
(2 rows)
-- Clean up
DROP TABLE pxtest1;
-- Test subtransactions
BEGIN;
CREATE TABLE pxtest2 (a int);
INSERT INTO pxtest2 VALUES (1);
SAVEPOINT a;
INSERT INTO pxtest2 VALUES (2);
ROLLBACK TO a;
SAVEPOINT b;
INSERT INTO pxtest2 VALUES (3);
PREPARE TRANSACTION 'regress-one';
CREATE TABLE pxtest3(fff int);
-- Test shared invalidation
BEGIN;
DROP TABLE pxtest3;
CREATE TABLE pxtest4 (a int);
INSERT INTO pxtest4 VALUES (1);
INSERT INTO pxtest4 VALUES (2);
DECLARE foo CURSOR FOR SELECT * FROM pxtest4;
-- Fetch 1 tuple, keeping the cursor open
FETCH 1 FROM foo;
a
---
1
(1 row)
PREPARE TRANSACTION 'regress-two';
-- No such cursor
FETCH 1 FROM foo;
ERROR: cursor "foo" does not exist
-- Table doesn't exist, the creation hasn't been committed yet
SELECT * FROM pxtest2;
ERROR: relation "pxtest2" does not exist
-- There should be two prepared transactions
SELECT gid FROM pg_prepared_xacts;
gid
-------------
regress-one
regress-two
(2 rows)
-- pxtest3 should be locked because of the pending DROP
set statement_timeout to 1000;
SELECT * FROM pxtest3;
ERROR: canceling query due to user request
reset statement_timeout;
-- Disconnect, we will continue testing in a different backend
\c -
-- There should still be two prepared transactions
SELECT gid FROM pg_prepared_xacts;
gid
-------------
regress-one
regress-two
(2 rows)
-- pxtest3 should still be locked because of the pending DROP
set statement_timeout to 1000;
SELECT * FROM pxtest3;
ERROR: canceling query due to user request
reset statement_timeout;
-- Commit table creation
COMMIT PREPARED 'regress-one';
\d pxtest2
Table "public.pxtest2"
Column | Type | Modifiers
--------+---------+-----------
a | integer |
SELECT * FROM pxtest2;
a
---
1
3
(2 rows)
-- There should be one prepared transaction
SELECT gid FROM pg_prepared_xacts;
gid
-------------
regress-two
(1 row)
-- Commit table drop
COMMIT PREPARED 'regress-two';
SELECT * FROM pxtest3;
ERROR: relation "pxtest3" does not exist
-- There should be no prepared transactions
SELECT gid FROM pg_prepared_xacts;
gid
-----
(0 rows)
-- Clean up
DROP TABLE pxtest2;
DROP TABLE pxtest4;
|
