Обсуждение: passing null parameter to plpgsq functions

Hello 
I wrote a plpgsql function with few parameters ; when I call the function,
some of the parameters can be null.
In this case, all the parameters are considered as null in the function's
body ! is it a feature ? how can I work around this ?

Example :
CREATE FUNCTION foo(text, text) RETURNS bool  AS '
beginIF ($1 IS NULL) AND ($2 IS NULL) THEN     RETURN FALSE;ELSE     RETURN TRUE;END IF;
end;
' LANGUAGE 'plpgsql';


SELECT foo(null,'bouh') => false (I expected true)
SELECT foo('schfk',null) => false (I expected true)
SELECT foo(null,null) => false (OK)
SELECT foo('schfk','bouh') => true (OK)

From: "Picard, Cyril" <cyril.picard@eads-dsn.com>

> Hello
> I wrote a plpgsql function with few parameters ; when I call the function,
> some of the parameters can be null.
> In this case, all the parameters are considered as null in the function's
> body ! is it a feature ? how can I work around this ?

It's a feature in versions before 7.1 (or possibly 7.0.x) you can still get
that behaviour in 7.1 by asking for strict null handling on a specific
function.

The only remedy AFAIK is to upgrade.

- Richard Huxton

Thank you ! I planned to use the 7.1 to get the outer join capability.

Is the 7.1 stable ?


> -----Message d'origine-----
> De:    Richard Huxton [SMTP:dev@archonet.com]
> Date:    mardi 3 avril 2001 10:06
> À:    Picard, Cyril; pgsql-sql@postgresql.org
> Objet:    Re: [SQL] passing null parameter to plpgsq functions
> 
> From: "Picard, Cyril" <cyril.picard@eads-dsn.com>
> 
> > Hello
> > I wrote a plpgsql function with few parameters ; when I call the
> function,
> > some of the parameters can be null.
> > In this case, all the parameters are considered as null in the
> function's
> > body ! is it a feature ? how can I work around this ?
> 
> It's a feature in versions before 7.1 (or possibly 7.0.x) you can still
> get
> that behaviour in 7.1 by asking for strict null handling on a specific
> function.
> 
> The only remedy AFAIK is to upgrade.
> 
> - Richard Huxton
> 
> 
> ---------------------------(end of broadcast)---------------------------
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> 
> http://www.postgresql.org/users-lounge/docs/faq.html

From: "Picard, Cyril" <cyril.picard@eads-dsn.com>

> Thank you ! I planned to use the 7.1 to get the outer join capability.
>
> Is the 7.1 stable ?

Pretty much - it's reached release candidate stage and I've been using it
for development for a while now.

- Richard Huxton