Обсуждение: Howto automatically define collumn names for a function result.
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.
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>
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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