Re: [SQL] SQL stored function inserting and returning data in a row.

Selon Daniel Caune <daniel(dot)caune(at)ubisoft(dot)com>:

> Hi,
>
> Is there any way to define a SQL stored function that inserts a row in a
> table and returns the serial generated?
>
> CREATE TABLE matchmaking_session
> (
> session_id bigint NOT NULL DEFAULT
> nextval('seq_matchmaking_session_id'),
> ...
> );
>
> CREATE FUNCTION create_matchmaking_sesssion(...)
> RETURNS bigint
> AS $$
> INSERT INTO matchmaking_session(...)
> VALUES (...)
> RETURNING session_id;
> $$ LANGUAGE SQL;
>
> 2008-01-10 22:08:48 EST ERROR: return type mismatch in function
> declared to return bigint
> 2008-01-10 22:08:48 EST DETAIL: Function's final statement must be a
> SELECT.
> 2008-01-10 22:08:48 EST CONTEXT: SQL function
> "create_matchmaking_sesssion"
>
> I can easily convert this code into a PL/pgSQL function, but I'm
> thinking that pure SQL is more natural (and faster?) for such a stored
> function.
>
> Regards,
>
> --
> Daniel
>
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>

Just add a SELECT query like this :

CREATE FUNCTION create_matchmaking_session()
RETURNS bigint
AS $$
INSERT INTO matchmaking_session
VALUES (nextval('seq_matchmaking_session_id'));

SELECT currval('seq_matchmaking_session_id') as session_id;

$$ LANGUAGE SQL;

--
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IUT de Villetaneuse