Re: PostgreSQL equivalent to Oracles ANYDATASET
Hi,
many thanks for this suggestion. But the problem with this is that you have to know which columns are returned when you call the function.
Regards
Dirk
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Dirk Mika
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Von: Christoph Moench-Tegeder <cmt@burggraben.net>
Datum: Freitag, 13. November 2020 um 18:23
An: Dirk Mika <Dirk.Mika@mikatiming.de>
Cc: "pgsql-general@lists.postgresql.org" <pgsql-general@lists.postgresql.org>
Betreff: Re: PostgreSQL equivalent to Oracles ANYDATASET
## Dirk Mika (Dirk.Mika@mikatiming.de):
SELECT * FROM TABLE(series_pkg.get_results(1));
The purpose of this function is to provide a DATASET, which has
different columns in the result depending on the passed parameter.
Is there any way to achieve something similar in PostreSQL?
testing=# CREATE OR REPLACE FUNCTION public.rr(p INTEGER)
RETURNS SETOF RECORD
LANGUAGE plpgsql
AS $function$
BEGIN
IF p = 1 THEN
RETURN NEXT ('k1'::TEXT, 'v1'::TEXT);
RETURN NEXT ('k2'::TEXT, 'v2'::TEXT);
ELSE
RETURN NEXT (23::INTEGER, 42::INTEGER, 'abc'::TEXT);
RETURN NEXT (42::INTEGER, 23::INTEGER, 'xyz'::TEXT);
END IF;
RETURN;
END;
$function$;
CREATE FUNCTION
testing=# SELECT * FROM rr(2) f(a INTEGER, b INTEGER, c TEXT);
a | b | c
----+----+-----
23 | 42 | abc
42 | 23 | xyz
(2 rows)
testing=# SELECT * FROM rr(1) f(x TEXT, y TEXT);
x | y
----+----
k1 | v1
k2 | v2
(2 rows)
Regards,
Christoph
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