Re: Syntax on BEFORE Trigger - Cascade?

On Thursday, June 13, 2024, David Barbour <dbarbour(at)istation(dot)com> wrote:

>
> When a record in *import_job* is deleted, the child records (file
> records) in *import_file* need to be deleted first.
>
> The constraint in both Oracle and Postgres is similar (Postgres version):
> *ALTER TABLE IF EXISTS idev.import_file*
>
>
>
> * ADD CONSTRAINT fk1_import_file FOREIGN KEY (import_job_oid)
> REFERENCES idev.import_job (oid) MATCH SIMPLE ON UPDATE NO ACTION ON
> DELETE CASCADE;*
>

This, by itself, should work. If it isn’t, please provide a self-contained
test case demonstrating that fact so it can be investigated/explained.

What version are you running?

> There aren't any delete triggers for either table. Any idea why this isn't
> working? Does cascade function differently in Postgres?
>
>
Nope (to both)

>
> I've also tried creating a before trigger on import_job,
>

Why?

>
> but can't seem to get the right syntax for taking the oid from the psql
> delete picked up by the trigger.
>

Your broken attempt to do this is likely what is causing the error.

>
> Here is one of my (many) attempts (have tried describing, setting, using
> new.oid, old.oid, a bunch of stuff) and can't get this right either:
>

Delete only populates OLD.

David J.