Hi all,
In the past, when writing trigger functions, I’ve always used pl/pgsql without
giving it a second thought. Today I was modifying a database creation script
that was originally intended for Firebird to work with Postgres and the example
trigger procedures in there were very close to pure SQL.
Hence, I started rewriting them as SQL functions, but is that really possible?
The return-type for trigger functions is usually ‘returns trigger’, which I
don’t know how to translate to SQL. Next to that, what should the SQL statement
inside the function be returning?
This got a bit puzzling and now I wonder whether this is possible at all? And
if so, what’s the correct syntax?
Say I have the below, how to actually return a value of type trigger?:
create or replace function pUpdateFoo()
returns trigger
as $$
update Bar
set baz = baz + NEW.feep - OLD.feep
where foo = NEW.foo;
$$;
create trigger tUpdateFoo
after update on Foo
for each row
execute procedure pUpdateFoo();
Glad to finally have a proper opportunity to apply PG again - it’s been too
long!
Alban Hertroys
--
If you can't see the forest for the trees,
cut the trees and you'll find there is no forest.
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