Hi
as far as I know hash keys must be strings.
So there simply can't be a undef() as a hashkey.
to prove what I said:
% perl -MData::Dumper -le '$hash{undef()} = "foo"; $hash{""} = "bar"; print
Dumper \%hash'
$VAR1 = {
'' => 'bar'
};
HTH Martin
On Thu, 14 Jun 2007 14:03:10 +0200
"Jenda Krynicky" <[EMAIL PROTECTED]> wrote:
> Date sent: Thu, 14 Jun 2007 06:29:56 -0400
> From: Mathew Snyder <[EMAIL PROTECTED]>
> To: Perl Beginners <beginners@perl.org>
> Subject: Hash Key is a Null Value
>
> > I'm building a hash using values from a database backend to an application
> > we
> > use in house. The application has a field which contains a customer name.
> > This
> > values is supposed to be set by the person handling the work but sometimes
> > doesn't get done. This leaves a NULL value in the database which, in turn,
> > leaves me with a null key in my hash.
> >
> > I've tried resetting it by assigning the value to another key so I can
> > delete
> > the element but so far nothing has worked. I've tried to access it with
> > $hash{}, $hash{""}, and $hash{''}. None of these will allow me to access
> > the data.
>
> $hash{undef()}
>
> You need to use the () because otherwise Perl would automatically
> quote the undef. So $hash{undef} is equivalent to $hash{'undef'}.
>
> You might also do something like this:
>
> my $NULL;
> print $hash{$NULL};
>
> HTH, Jenda
> ===== [EMAIL PROTECTED] === http://Jenda.Krynicky.cz =====
> When it comes to wine, women and song, wizards are allowed
> to get drunk and croon as much as they like.
> -- Terry Pratchett in Sourcery
>
>
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