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CREATE EXTENSION lo;
CREATE TABLE image (title text, raster lo);
CREATE TRIGGER t_raster BEFORE UPDATE OR DELETE ON image
FOR EACH ROW EXECUTE PROCEDURE lo_manage(raster);
SELECT lo_create(43213);
lo_create
-----------
43213
(1 row)
SELECT lo_create(43214);
lo_create
-----------
43214
(1 row)
INSERT INTO image (title, raster) VALUES ('beautiful image', 43213);
SELECT lo_get(43213);
lo_get
--------
\x
(1 row)
SELECT lo_get(43214);
lo_get
--------
\x
(1 row)
UPDATE image SET raster = 43214 WHERE title = 'beautiful image';
SELECT lo_get(43213);
ERROR: large object 43213 does not exist
SELECT lo_get(43214);
lo_get
--------
\x
(1 row)
-- test updating of unrelated column
UPDATE image SET title = 'beautiful picture' WHERE title = 'beautiful image';
SELECT lo_get(43214);
lo_get
--------
\x
(1 row)
DELETE FROM image;
SELECT lo_get(43214);
ERROR: large object 43214 does not exist
DROP TABLE image;
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