Re: plpgsql question

On Tue, Aug 30, 2005 at 12:15:54PM -0400, Postgres Admin wrote:
>
> Can I do something like this:

It's good that you gave an example, but it would also be good to
give a summary of what you're trying to do and what trouble you're
having so people don't have to guess.

> CREATE TABLE sample (id SERIAL, node INTEGER, parent INTEGER);
> INSERT INTO sample(node,parent) VALUES(1,0);
> INSERT INTO sample(node,parent) VALUES(2,0);
> INSERT INTO sample(node,parent) VALUES(3,1);
> INSERT INTO sample(node,parent) VALUES(4,3)
>
> CREATE OR REPLACE FUNCTION article_display(anyelement, anyelement)
> RETURNS SETOF samle AS $$

I assume you want to return "SETOF sample", not "samle". When
posting code please post the actual code you're running so typos
don't distract from the real problem (unless a typo *is* part of
the problem).

> DECLARE
> articleRow sample%ROWTYPE;
> BEGIN
> FOR articleRow IN SELECT comments
> FROM theirry.articles

You're selecting a column of one table (theirry.articles) into a
row type variable of another table (sample). If the value of
comments can't be converted to an integer (the type of sample's
first column) then you'll get a syntax error. And what about the
other columns of sample? What are you really trying to do here?

> ORDER BY article_id
> DESC LIMIT $1
> OFFSET $2 LOOP

If you're using the function's arguments like this, why did you
declare them as anyelement instead of integer?

> RETURN NEXT articleRow;
> END LOOP;
> RETURN;
> END;
> $$ LANGUAGE plpgsql;

It's not clear what you're trying to do nor what problems you're
having. Is this example real or a contrived facsimile of what
you're really trying to do? Could you provide some more information?

--
Michael Fuhr