mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-27 08:39:28 +08:00
5b0c9d3603
a physically separate type. Defining 'lo' as a domain over OID works just fine and is more efficient. Improve documentation and fix up the test script. (Would like to turn test script into a proper regression test, but right now its output is not constant because of numeric OIDs; plus it makes Unix-specific assumptions about files it can import.)
75 lines
1.7 KiB
SQL
75 lines
1.7 KiB
SQL
--
|
|
-- This runs some common tests against the type
|
|
--
|
|
-- It's used just for development
|
|
--
|
|
-- XXX would be nice to turn this into a proper regression test
|
|
--
|
|
|
|
-- Check what is in pg_largeobject
|
|
SELECT count(DISTINCT loid) FROM pg_largeobject;
|
|
|
|
-- ignore any errors here - simply drop the table if it already exists
|
|
DROP TABLE a;
|
|
|
|
-- create the test table
|
|
CREATE TABLE a (fname name,image lo);
|
|
|
|
-- insert a null object
|
|
INSERT INTO a VALUES ('empty');
|
|
|
|
-- insert a large object based on a file
|
|
INSERT INTO a VALUES ('/etc/group', lo_import('/etc/group')::lo);
|
|
|
|
-- now select the table
|
|
SELECT * FROM a;
|
|
|
|
-- check that coercion to plain oid works
|
|
SELECT *,image::oid from a;
|
|
|
|
-- now test the trigger
|
|
CREATE TRIGGER t_a
|
|
BEFORE UPDATE OR DELETE ON a
|
|
FOR EACH ROW
|
|
EXECUTE PROCEDURE lo_manage(image);
|
|
|
|
-- insert
|
|
INSERT INTO a VALUES ('aa', lo_import('/etc/hosts'));
|
|
SELECT * FROM a
|
|
WHERE fname LIKE 'aa%';
|
|
|
|
-- update
|
|
UPDATE a SET image=lo_import('/etc/group')::lo
|
|
WHERE fname='aa';
|
|
SELECT * FROM a
|
|
WHERE fname LIKE 'aa%';
|
|
|
|
-- update the 'empty' row which should be null
|
|
UPDATE a SET image=lo_import('/etc/hosts')
|
|
WHERE fname='empty';
|
|
SELECT * FROM a
|
|
WHERE fname LIKE 'empty%';
|
|
UPDATE a SET image=null
|
|
WHERE fname='empty';
|
|
SELECT * FROM a
|
|
WHERE fname LIKE 'empty%';
|
|
|
|
-- delete the entry
|
|
DELETE FROM a
|
|
WHERE fname='aa';
|
|
SELECT * FROM a
|
|
WHERE fname LIKE 'aa%';
|
|
|
|
-- This deletes the table contents. Note, if you comment this out, and
|
|
-- expect the drop table to remove the objects, think again. The trigger
|
|
-- doesn't get fired by drop table.
|
|
DELETE FROM a;
|
|
|
|
-- finally drop the table
|
|
DROP TABLE a;
|
|
|
|
-- Check what is in pg_largeobject ... if different from original, trouble
|
|
SELECT count(DISTINCT loid) FROM pg_largeobject;
|
|
|
|
-- end of tests
|