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Cleanup the contrib/lo module: there is no need anymore to implement

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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.)
This commit is contained in:
Tom Lane
2005-06-23 00:06:37 +00:00
parent d20763dbee
commit 5b0c9d3603
6 changed files with 90 additions and 202 deletions
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23
contrib/lo/lo_test.sql
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@ -3,6 +3,11 @@
--
-- 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;
@ -11,18 +16,15 @@ DROP TABLE a;
CREATE TABLE a (fname name,image lo);
-- insert a null object
INSERT INTO a VALUES ('null');
-- insert an empty large object
INSERT INTO a VALUES ('empty','');
INSERT INTO a VALUES ('empty');
-- insert a large object based on a file
INSERT INTO a VALUES ('/etc/group',lo_import('/etc/group')::lo);
INSERT INTO a VALUES ('/etc/group', lo_import('/etc/group')::lo);
-- now select the table
SELECT * FROM a;
-- this select also returns an oid based on the lo column
-- check that coercion to plain oid works
SELECT *,image::oid from a;
-- now test the trigger
@ -32,7 +34,7 @@ FOR EACH ROW
EXECUTE PROCEDURE lo_manage(image);
-- insert
INSERT INTO a VALUES ('aa','');
INSERT INTO a VALUES ('aa', lo_import('/etc/hosts'));
SELECT * FROM a
WHERE fname LIKE 'aa%';
@ -43,7 +45,7 @@ SELECT * FROM a
WHERE fname LIKE 'aa%';
-- update the 'empty' row which should be null
UPDATE a SET image=lo_import('/etc/hosts')::lo
UPDATE a SET image=lo_import('/etc/hosts')
WHERE fname='empty';
SELECT * FROM a
WHERE fname LIKE 'empty%';
@ -60,10 +62,13 @@ 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 thrown by drop table.
-- 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