I'm feeling sausey today, so here is my (untested) attempt to
translate your function. It's inline below, and you'll want to look
here http://www.postgresql.org/docs/7.4/interactive/plpgsql.html for
more information.
On Mon, 22 Nov 2004 09:18:13 -0600, Richard Rowell
<richard@bowmansystems.com> wrote:
> I'm trying to port some TSQL to PLPGSQL. The DB has a table with a
> recursive foreign key that represents a tree hierarchy. I'm trying to
> re-create a TSQL function that pulls out all the ancestors of a given
> node in the hierarchy.
>
> I'm rather new to PLSQL and I have several questions.
>
> 1. In TSQL, I can assign a scalar to the result of query like so:
> SET @var1 = (SELECT foo FROM bar WHERE bar.uid=@var2)
>
> How would I do this in PLSQL?
>
> 2. In TSQL the "result table" can be inserted into manually. IE:
>
> CREATE FUNCTION foo () RETURNS @ttable TABLE( uid INTEGER) AS BEGIN
> INSERT @ttable VALUES (1)
> RETURN
> END
>
> Is there a way to manually insert rows into the result table in PLSQL?
>
> What follows is my TSQL function if that helps give context.
>
> 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 =@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=@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 count(*) FROM providers WHERE uid =@child_provider) > 0 LOOP cid := child_provider IF cid
ISNULL THEN EXIT; END IF; RETURN NEXT cid; SELECT INTO cid parent_id FROM providers WHERE
uid=@cid; END LOOP; RETURN
END;' LANGUAGE 'plpgsql';
Hope that helps!
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--
Mike Rylander
mrylander@gmail.com
GPLS -- PINES Development
Database Developer