Re: refursor from dynamic query

From: Toby Tremayne <lists(at)devfrag(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Re: refursor from dynamic query
Date: 2002-12-11 23:42:45
Message-ID: 101314662871.20021212104245@devfrag.com
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hmm ok I've played a little more with this and I've discovered if I
run the following in psql:

begin;
select poptions(1);

-- output -- <unnamed cursor 18>
-- output -- 1 row(s)

fetch all in "<unnamed cursor 18>";
commit;

it spits out the rows I was expecting it to have. So obviously the
function is returning a refcursor that contains the data I'd
expected. My problem is I'm calling this function from a cold fusion
template and I'm receiving an empty query object (which I'm assuming
is the refcursor). How can I easily get at the records within the
cursor? Is there something I'm missing?

cheers,
Toby

> Hi all,

> just subscribed to the list - I've been writing my first
> function/stored procedure and I've hit a bit of a problem. I'm
> trying to build a dynamic query, then execute it but I need to
> return a refcursor containing the records the dynamic query finds.
> My code is below - I'd appreciate it if anyone could point me in
> the right direction....

> CREATE FUNCTION poptions (INTEGER)
> RETURNS REFCURSOR AS '
> DECLARE
> -- parameters
> p_author_id ALIAS FOR $1;

> -- local variables
> rc REFCURSOR;
> row_data poem_option_def%ROWTYPE;
> qString varchar(4000);

> BEGIN
> qString := ''SELECT p.poem_id,p.poem_title'';

> FOR row_data IN SELECT option_id,option_name FROM poem_option_def LOOP
> qString := qString || '', (SELECT po.setting FROM poem_option po WHERE po.poem_id = p.poem_id and po.option_id = '' || row_data.option_id || '') AS '' || row_data.option_name;
> END LOOP;

> qString := qString || '' FROM poem p WHERE p.author_id = '' || p_author_id;

> OPEN rc FOR EXECUTE qString;

> RETURN rc;
> end;
> ' LANGUAGE 'plpgsql';

> cheers,
> Toby

> ---------------------------------------

> Life is poetry - write it in your own words.

> ---------------------------------------

> Toby Tremayne
> Senior Technical Consultant
> Code Poet and Zen Master of the Heavy Sleep
> Lyricist Software
> www.lyricist.com.au
> 0416 048 090
> ICQ: 13107913

> ---------------------------(end of broadcast)---------------------------
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---------------------------------------

Life is poetry - write it in your own words.

---------------------------------------

Toby Tremayne
Senior Technical Consultant
Code Poet and Zen Master of the Heavy Sleep
Lyricist Software
www.lyricist.com.au
0416 048 090
ICQ: 13107913

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