Re: Complexity of contrib types

From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
To: hannu(at)trust(dot)ee (Hannu Krosing)
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Complexity of contrib types
Date: 1998-07-21 15:47:40
Message-ID: 199807211547.LAA29661@candle.pha.pa.us
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> > Can't they SELECT from pg_proc?
>
> Making it a function would probably make the type-addition script
> easier.

I guess, but much less flexible.

>
> > >
> > > The real solution would of course be extending the (Postgre)SQL language
> > > to find the OIDs automatically, like Oracle currently does for its
> > > COMMENT
> > > statement, an equivalent of which could be used in PostgreSQL to insert
> > > values in pg_description on the fly.
> >
> > We return oid's as part of an INSERT. Is that what you meant?
>
> It is very hard (probably impossible) to use them from a psql script.
>
> If I remember the syntax right (have'nt used Oracle for >=2 years),
> I could do:
>
> COMMENT "this is a nice table" ON TABLE nice_table;
> COMMENT "this is an unnecessary field from a nice table"
> ON FIELD nice_table.unnecessary_field;
>
> Of course, to fully support it we would need a much improved foreign
> key support, so that we could set the ON DELETE CASCADE for the
> commented on tables, and do it so that the foreign key can references
> _any_ table ;).
>
> If we could manage that, we could really call PostgreSQL an OO database.

We could create a function that returned the previously inserted oid,
and use that in the next query.

insert into test values (4);
update test3 set val = lastoid();

Just remember the lastoid inserted in the backend code. Seems easy. Do
you want it added to the TODO list.

--
Bruce Momjian | 830 Blythe Avenue
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+ If your life is a hard drive, | (610) 353-9879(w)
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