From: Jorge Godoy <jgodoy@gmail.com>
To: Andreas <maps.on@gmx.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: Howto automatically define collumn names for a function result.
Date: Thu, 27 Aug 2009 08:25:49 -0300
Message-ID: <175c742d0908270425t748fe0f7v8cf9d15c3727031a@mail.gmail.com> (raw)
In-Reply-To: <4A966932.6050602@gmx.net>
References: <4A966932.6050602@gmx.net>
Have you tried returning SETOF RECORD[] and using the OUT specification?
CREATE OR REPLACE FUNCTION bla(integer, date, OUT date, OUT integer)
RETURNS SETOF RECORD[] AS
$_$
SELECT date AS output_date, $1+2 AS next_record FROM table WHERE id = $1
AND start_date >= $2;
$_$ LANGUAGE SQL;
(Just an example code, I haven't tried it myself. I know it works for
plpgsql functions, not sure for sql functions).
Regards,
--
Jorge Godoy <jgodoy@gmail.com>
On Thu, Aug 27, 2009 at 08:08, Andreas <maps.on@gmx.net> wrote:
> Hi,
> wouldn't it be great to have functions return "setof something" as result
> where "something" was determined out of the result of a SELECT within the
> function?
> like
>
> CREATE OR REPLACE FUNCTION coffee(integer, timestamp, timestamp)
> RETURNS SETOF
> AS
> $BODY$
> SELECT staff_id, name, room, COUNT(coffee_id) AS cupcount
> FROM staff JOIN coffee_log ON staff_fk = staff_id
> WHERE (staff_id = $1) AND (coffee_time BETWEEN $2 AND $3)
> GROUP BY staff_id, name, room
> ORDER BY name;
> $BODY$
> LANGUAGE 'sql' STABLE
>
> There the SELECT dumps a constant set of collumns where as far as I know
> have to be defined as a type to make SETOF happy or define the names
> whenever I call the function which would be tedious.
>
> Actually this is a pretty simple example of some reports I need to produce.
> They have around 60 collumns and there is also an aggregate and filtering
> on an id as well as 2 timestamps.
> Since the aggregate depends on id and timestamps too, it is no solution to
> build a view and select from that within the function.
>
> --
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To: pgsql-sql@postgresql.org
Cc: jgodoy@gmail.com, maps.on@gmx.net
Subject: Re: Howto automatically define collumn names for a function result.
In-Reply-To: <175c742d0908270425t748fe0f7v8cf9d15c3727031a@mail.gmail.com>
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