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Re: temporary table / recursion

From: imad <immaad(at)gmail(dot)com>
To: "Robert Wimmer" <seppwimmer(at)hotmail(dot)com>
Cc: pgsql-interfaces(at)postgresql(dot)org
Subject: Re: temporary table / recursion
Date: 2007-02-11 21:05:57
Message-ID: 1f30b80c0702111305m7c04ffe4hbb58d780561eb606@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-interfaces
Your INSERT statement is still missing EXECUTE command :-)

--Imad
www.EnterpriseDB.com

On 2/12/07, Robert Wimmer <seppwimmer(at)hotmail(dot)com> wrote:
>
> >Not like that, use the execute command inside your function.
> >Here is the description and example.
> >http://www.postgresql.org/docs/8.0/static/plpgsql-statements.html
> >
>
> that was what I tried before the PREPARE EXECUTE example and it did not
> work.
> so i will try it again
>
> *** snippet ***
>
> CREATE FUNCTION recurs.scan(p_start INTEGER) RETURNS SETOF recurs.tree AS $$
> DECLARE tmp RECORD;
> BEGIN
>
>   EXECUTE 'CREATE TEMP TABLE recurs_temp (id INT, parent_id INT, label
> TEXT)';
>
>   INSERT INTO recurs_temp SELECT * FROM recurs.tree WHERE id = p_start;  --
> first node
>   EXECUTE recurs.walk(p_start); -- create tree
>   FOR tmp IN SELECT * FROM recurs_temp LOOP RETURN NEXT tmp; END LOOP;
>
>   EXECUTE 'DROP TABLE recurs_temp';
>
>   RETURN;
>
> END; $$
> LANGUAGE plpgsql;
>
> ****
>
> and the output ...
>
> ****
>
> recurs=# SELECT * FROM recurs.scan(1);
> id | parent_id |   label
> ----+-----------+-----------
>   1 |           | 1
>   4 |         2 | 1.1.1
>   5 |         2 | 1.1.2
>   6 |         2 | 1.1.3
>   7 |         2 | 1.1.4
>   8 |         2 | 1.1.5
> 11 |        10 | 1.1.6.2
> 13 |        12 | 1.1.6.3.1
> 12 |        10 | 1.1.6.3
> 10 |         9 | 1.1.6.1
>   9 |         2 | 1.1.6
>   2 |         1 | 1.1
> 14 |         3 | 1.2.1
> 15 |         3 | 1.2.2
> 16 |         3 | 1.2.3
>   3 |         1 | 1.2
> (16 rows)
>
> recurs=# \dt
> No relations found.
> recurs=# SELECT * FROM recurs.scan(1);
> ERROR:  relation with OID 2084590 does not exist
> KONTEXT:  SQL statement "INSERT INTO recurs_temp SELECT * FROM recurs.tree
> WHERE id =  $1 "
> PL/pgSQL function "scan" line 6 at SQL statement
> recurs=# \dt
> No relations found.
>
> ****
>
>
> so i dont know what went wrong now ...
>
> i am using Postgres 8.0.3 on Windows XP
>
> nevertheless thanx for your help
>
> >
> >--Imad
> >www.EnterpriseDB.com
> >
> >---------------------------(end of broadcast)---------------------------
> >TIP 6: explain analyze is your friend
>
> _________________________________________________________________
> Die MSN Homepage liefert Ihnen alle Infos zu Ihren Lieblingsthemen.
> http://at.msn.com/
>
>

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