Re: [SQL] Looking for information on PostgreSQL Stored Procedures - Mailing list pgsql-general

From Foster, Stephen
Subject Re: [SQL] Looking for information on PostgreSQL Stored Procedures
Date
Msg-id 000001c5fe7d$be7f5470$2101a8c0@cfgod
Whole thread Raw
In response to Re: [SQL] Looking for information on PostgreSQL Stored Procedures  (Michael Fuhr <mike@fuhr.org>)
List pgsql-general
Thanks Michael!  Guess I should have drunk more coffee before replying.
I must have miss that.

-----Original Message-----
From: Michael Fuhr [mailto:mike@fuhr.org]
Sent: Sunday, December 11, 2005 11:22 AM
To: Douglas McNaught
Cc: Foster, Stephen; pgsql-general@postgresql.org;
pgsql-sql@postgresql.org
Subject: Re: [SQL] [GENERAL] Looking for information on PostgreSQL
Stored Procedures

On Sun, Dec 11, 2005 at 11:38:47AM -0500, Douglas McNaught wrote:
> "Foster, Stephen" <stephenlfoster@comcast.net> writes:
>
> > WHILE (--Lost on variable name for end of query; EmptyQueryResponse
<>
> > 0? --)
> >     BEGIN
> >         IF LastName = fname THEN
> >             DELETE FROM MailingList WHERE id = id;
> >         END IF;
> >         LastName := fname;
> >         FETCH NEXT FROM NewListCursor INTO fname, id;
> >     END;
> > CLOSE NewListCursor;
> > $BODY$
> > LANGUAGE 'sql' VOLATILE;
>
> You can't do any looping or other control structures in an SQL
> function.  Use PL/pgSQL instead.

And as I mentioned in my previous post, you can loop through query
results without messing around with an explicit cursor.

CREATE FUNCTION testfunc() RETURNS void AS $$
DECLARE
    row  record;
BEGIN
    FOR row IN SELECT * FROM tablename ORDER BY whatever LOOP
    -- do stuff that refers to row.column_name
    END LOOP;

    RETURN;
END;
$$ LANGUAGE plpgsql;

--
Michael Fuhr

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