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Re: Recursive SETOF function

From: Mike Rylander <mrylander(at)gmail(dot)com>
To: Richard Rowell <richard(at)bowmansystems(dot)com>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: Recursive SETOF function
Date: 2004-11-22 16:56:31
Message-ID: b918cf3d04112208564c5fb783@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-sql
Forgot one line.  See below

On Mon, 22 Nov 2004 11:54:30 -0500, Mike Rylander <mrylander(at)gmail(dot)com> wrote:
> I'm feeling sausey today, so here is my (untested) attempt to
[snip]
> > CREATE FUNCTION svp_getparentproviderids (@child_provider INTEGER)
> > RETURNS @provider_ids TABLE ( uid INTEGER )
> > AS
> > BEGIN
> >     DECLARE @cid AS INTEGER
> >     IF (SELECT count(*) FROM providers WHERE uid =(at)child_provider) > 0
> >     BEGIN
> >         SET @cid = @child_provider
> >         WHILE @cid IS NOT NULL
> >         BEGIN
> >             INSERT @provider_ids VALUES (@cid)
> >             SET @cid = (SELECT parent_id FROM providers WHERE uid=(at)cid)
> >         END
> >     END
> >     RETURN
> > END
> >
> 
> -- This TYPE will get you a named column... easier to use SRFs with a
> preexisting type.
> CREATE TYPE svp_getparentproviderids_uid_type AS ( uid INTEGER );
> 
> CREATE FUNCTION svp_getparentproviderids (INTEGER)
>    RETURNS SETOF svp_getparentproviderids_uid_type
>    AS '
> DECLARE
>   child_provider ALIAS FOR $1;
>   cid INTEGER;
> BEGIN

    SELECT * FROM providers WHERE uid =(at)child_provider) > 0
    IF NOT FOUND
        RETURN;
    END IF;

>     LOOP
>         cid := child_provider
>         IF cid IS NULL THEN
>           EXIT;
>         END IF;
>         RETURN NEXT cid;
>         SELECT INTO cid parent_id FROM providers WHERE uid=(at)cid;
>     END LOOP;
>     RETURN
> END;' LANGUAGE 'plpgsql';
> 
> Hope that helps!
> 
> > --
> 
> 
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 3: if posting/reading through Usenet, please send an appropriate
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> >       message can get through to the mailing list cleanly
> >
> 
> 
> --
> Mike Rylander
> mrylander(at)gmail(dot)com
> GPLS -- PINES Development
> Database Developer
> 


-- 
Mike Rylander
mrylander(at)gmail(dot)com
GPLS -- PINES Development
Database Developer

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