Usa il catalogo pg_trigger.
Una semplice ricerca per una tabella books :
select tgname
from pg_trigger
where not tgisinternal
and tgrelid = 'books'::regclass;
tgname
---------------
books_trigger
(1 row)
Usando pg_proc per ottenere l'origine della funzione trigger:
select tgname, proname, prosrc
from pg_trigger
join pg_proc p on p.oid = tgfoid
where not tgisinternal
and tgrelid = 'books'::regclass;
tgname | proname | prosrc
---------------+---------------+------------------------------------------------
books_trigger | books_trigger | +
| | begin +
| | if tg_op = 'UPDATE' then +
| | if new.listorder > old.listorder then +
| | update books +
| | set listorder = listorder- 1 +
| | where listorder <= new.listorder +
| | and listorder > old.listorder +
| | and id <> new.id; +
| | else +
| | update books +
| | set listorder = listorder+ 1 +
| | where listorder >= new.listorder +
| | and listorder < old.listorder +
| | and id <> new.id; +
| | end if; +
| | else +
| | update books +
| | set listorder = listorder+ 1 +
| | where listorder >= new.listorder +
| | and id <> new.id; +
| | end if; +
| | return new; +
| | end
(1 row)
Esempio di pg_get_triggerdef() utilizzo delle funzioni:
select pg_get_triggerdef(t.oid) as "trigger declaration"
from pg_trigger t
where not tgisinternal
and tgrelid = 'books'::regclass;
trigger declaration
--------------------------------------------------------------------------------------------------------------
CREATE TRIGGER books_trigger BEFORE INSERT OR UPDATE ON books FOR EACH ROW EXECUTE PROCEDURE books_trigger()
(1 row)
In uno Sqitch verify script puoi utilizzare un blocco di codice anonimo, ad es.:
do $$
begin
perform tgname
from pg_trigger
where not tgisinternal
and tgrelid = 'books'::regclass;
if not found then
raise exception 'trigger not found';
end if;
end $$;
