Re: URGENT: How to change ON CASCADE RESTRICT to DELETE?

On Wed, 2 Jul 2003, Robert wrote:

> Stephan Szabo wrote:
>
> >>  how can I change ON CASCADE RESTRICT to ON CASCADE DELETE? I need to
> >>do it on my production database now (client is really complaining...)
> >>and I dont see any DROP CONSTRAINT in the docs - whats the right and/or
> >>simplest way? Thanks a lot
> >>
> >>
> >
> >If you're using 7.3, you should IIRC be able to use alter table to drop
> >the constraint and then re-add it.
> >
> >If you're using an older version, I think you may need to find the
> >triggers involved and drop those and then re-add the constraint.  I think
> >techdocs has some info on finding the triggers.
> >
> >
> Tried ALTER TABLE (yes, this is 7.3) but \d says
>
> nbcz=# \d seasons
>                             Table "public.seasons"
>   Column  |  Type   |
> Modifiers
> ----------+---------+---------------------------------------------------------
>  id       | integer | not null default
> nextval('public.seasons_id_seq'::text)
>  hotel_id | integer |
>  name     | text    |
> Indexes: seasons_pkey primary key btree (id)
> Foreign Key constraints: $1 FOREIGN KEY (hotel_id) REFERENCES hotels(id)
> ON UPDATE NO ACTION ON DELETE NO ACTION
>
> and
>
> ALTER TABLE seasons DROP CONSTRAINT $1;
>
> didn't work. Apparently I'm more then a bit confused, but what's the
> name of the constraint here? I finally took a deep breath, dropped the
> database and edited dump directly. Now it seems to work, but I'd still
> like to now the correct way (ALTER TABLE but how?) Thanks for your help
>

I don't know about it being the correct way but isn't there entries in
pg_constraint that you can twiddle directly to change the cascade action?


--
Nigel J. Andrews