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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;
a
-----
777
(1 row)
BEGIN;
CREATE TABLE disappear (a int4);
DELETE FROM aggtest;
-- should be empty
SELECT * FROM aggtest;
a | b
---+---
(0 rows)
ABORT;
-- should not exist
SELECT oid FROM pg_class WHERE relname = 'disappear';
oid
-----
(0 rows)
-- should have members again
SELECT * FROM aggtest;
a | b
-----+---------
56 | 7.8
100 | 99.097
0 | 0.09561
42 | 324.78
(4 rows)
-- 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
ERROR: transaction is read-only
INSERT INTO writetest VALUES (1); -- fail
ERROR: transaction is read-only
SELECT * FROM writetest; -- ok
a
---
(0 rows)
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
ERROR: transaction is read-only
SELECT * FROM writetest, temptest; -- ok
a | a
---+---
(0 rows)
CREATE TABLE test AS SELECT * FROM writetest; -- fail
ERROR: transaction is read-only
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);
BEGIN;
DROP TABLE foo;
CREATE TABLE bar (a int);
ROLLBACK;
BEGIN;
CREATE TABLE baz (a int);
COMMIT;
drop TABLE foobar;
CREATE TABLE barbaz (a int);
COMMIT;
-- should exist: barbaz, baz, foo
SELECT * FROM foo; -- should be empty
a
---
(0 rows)
SELECT * FROM bar; -- shouldn't exist
ERROR: relation "bar" does not exist
SELECT * FROM barbaz; -- should be empty
a
---
(0 rows)
SELECT * FROM baz; -- should be empty
a
---
(0 rows)
-- inserts
BEGIN;
INSERT INTO foo VALUES (1);
BEGIN;
INSERT into bar VALUES (1);
ERROR: relation "bar" does not exist
ROLLBACK;
BEGIN;
INSERT into barbaz VALUES (1);
COMMIT;
BEGIN;
BEGIN;
INSERT INTO foo VALUES (2);
COMMIT;
ROLLBACK;
INSERT INTO foo VALUES (3);
COMMIT;
SELECT * FROM foo; -- should have 1 and 3
a
---
1
3
(2 rows)
SELECT * FROM barbaz; -- should have 1
a
---
1
(1 row)
-- check that starting a subxact in a failed xact or subxact works
BEGIN;
SELECT 0/0; -- fail the outer xact
ERROR: division by zero
BEGIN;
SELECT 1; -- this should NOT work
ERROR: current transaction is aborted, commands ignored until end of transaction block
COMMIT;
SELECT 1; -- this should NOT work
ERROR: current transaction is aborted, commands ignored until end of transaction block
BEGIN;
SELECT 1; -- this should NOT work
ERROR: current transaction is aborted, commands ignored until end of transaction block
ROLLBACK;
SELECT 1; -- this should NOT work
ERROR: current transaction is aborted, commands ignored until end of transaction block
COMMIT;
SELECT 1; -- this should work
?column?
----------
1
(1 row)
BEGIN;
BEGIN;
SELECT 1; -- this should work
?column?
----------
1
(1 row)
SELECT 0/0; -- fail the subxact
ERROR: division by zero
SELECT 1; -- this should NOT work
ERROR: current transaction is aborted, commands ignored until end of transaction block
BEGIN;
SELECT 1; -- this should NOT work
ERROR: current transaction is aborted, commands ignored until end of transaction block
ROLLBACK;
BEGIN;
SELECT 1; -- this should NOT work
ERROR: current transaction is aborted, commands ignored until end of transaction block
COMMIT;
SELECT 1; -- this should NOT work
ERROR: current transaction is aborted, commands ignored until end of transaction block
ROLLBACK;
SELECT 1; -- this should work
?column?
----------
1
(1 row)
COMMIT;
SELECT 1; -- this should work
?column?
----------
1
(1 row)
-- check non-transactional behavior of cursors
BEGIN;
DECLARE c CURSOR FOR SELECT unique2 FROM tenk1;
BEGIN;
FETCH 10 FROM c;
unique2
---------
0
1
2
3
4
5
6
7
8
9
(10 rows)
ROLLBACK;
BEGIN;
FETCH 10 FROM c;
unique2
---------
10
11
12
13
14
15
16
17
18
19
(10 rows)
COMMIT;
FETCH 10 FROM c;
unique2
---------
20
21
22
23
24
25
26
27
28
29
(10 rows)
CLOSE c;
DECLARE c CURSOR FOR SELECT unique2/0 FROM tenk1;
BEGIN;
FETCH 10 FROM c;
ERROR: division by zero
ROLLBACK;
-- c is now dead to the world ...
BEGIN;
FETCH 10 FROM c;
ERROR: portal "c" cannot be run
ROLLBACK;
FETCH 10 FROM c;
ERROR: portal "c" cannot be run
COMMIT;
DROP TABLE foo;
DROP TABLE baz;
DROP TABLE barbaz;
|
