-- Adjust this setting to control where the objects get created. SET search_path = public;
-- -- 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(oid) FROM pg_largeobject_metadata;
-- ignore any errors here - simply drop the table if it already exists DROPTABLE a;
-- create the test table CREATETABLE a (fname name,image lo);
-- insert a null object INSERTINTO a VALUES ('empty');
-- insert a large object based on a file INSERTINTO 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 CREATETRIGGER t_a BEFOREUPDATEORDELETEON a FOREACH ROW
EXECUTE PROCEDURE lo_manage(image);
-- insert INSERTINTO 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 DELETEFROM 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. DELETEFROM a;
-- finally drop the table DROPTABLE a;
-- Check what is in pg_largeobject ... if different from original, trouble SELECT count(oid) FROM pg_largeobject_metadata;
-- end of tests
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(vorverarbeitet am 2026-08-08)
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