1.
Plpgsql-function can return record (or set of records).
Sql-function returns result of the last query in it's body.
2.
I prefer simple solutions, though I write sql-functions whenever
requirement likes as "parametrized view". But I know that in some
special situations plpgsql-function with clever loops may have better
performance than simple sql-function with very complicated joins.
3.
Could you explain your question it in some example?
Cristian Prieto wrote:
> Well, I will ask a little more clear:
> 1. A function could be declare to return a RECORD value? (the manual
> doesn't put it so clear, mention only simple return values and
> declaration values, not return values).
> 2. It will be better declare that function as a parametrized view or
> as a pgsql function?
> 3. If the record value is not a right return value, what kind of
> return value could I use for it?
>
> Thanks a lot for your help...
>
> ----- Original Message ----- From: "Jan Poslusny" <pajout@gingerall.cz>
> To: "Cristian Prieto" <cristian@clickdiario.com>
> Cc: <pgsql-general@postgresql.org>
> Sent: Wednesday, February 23, 2005 6:44 AM
> Subject: Re: [GENERAL] Help with a very newbie question...
>
>
>> I think that sql-functions may serve as parametrized views for you...
>>
>> http://www.postgresql.org/docs/8.0/static/xfunc-sql.html
>>
>> Cristian Prieto wrote:
>>
>>> I want to create a view or a sp which returns NULL if nothing is
>>> found and a recordset if the user is found
>>> I wrote something like:
>>> CREATE sp_getuser(name, pass) RETURNS record AS
>>> $body$
>>> DECLARE
>>> retval RECORD;
>>> BEGIN
>>> SELECT INTO retval * FROM Users WHERE userid=name AND passwd=pass;
>>> IF NOT FOUND THEN
>>> RETURN NULL;
>>> ELSE
>>> RETURN retval;
>>> END;
>>> $body$
>>> LANGUAGE plpgsql;
>>> What is wrong with that function? I guess I could create it as a
>>> View but I don't know how to pass parameters in a view, somebody
>>> could help me with this?
>>> Thanks a lot!
>>
>>
>>
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