Hi Eric:
On Mon, Nov 01, 2004 at 10:40:36PM -0500, Eric Lease Morgan wrote:
> In a package I'm writing I initialize an array reference (I think)
> through DBI like this:
>
> $self->{author_ids} = $dbh->selectall_arrayref($query);
>
> First of all, what sort of foreach loop can I write to iterate through
> the contents of $self->{author_ids}?
De-reference the array reference, here's one example:
foreach my $id ( @{ $self->{author_ids} } ) {
...
}
> Second, how do I undefine the value of $self->{author_ids}?
$self->{author_ids} = undef;
But if I were you I'd have your constructor initialize the slots that can
contain array references to an empty array reference:
sub new {
my $class = shift;
my $self = bless {}, $class;
$self->{author_ids} = [];
}
The advantage here is that you won't attempt to use undef as an array
reference somewhere in your code. This is a runtime error in Perl, so
it can result in an unpredictable program if the code isn't exercised
all the time.
> Third, if I have a list of integers, how to I assign the items in this
> list to $self->{author_ids}?
$self->{author_ids} = [ @list_of_integers ];
or if you don't mind the list being referenced from two locations:
$self->{author_ids} = [EMAIL PROTECTED];
Hope this helps!
//Ed
--
Ed Summers
aim: inkdroid
web: http://www.inkdroid.org
The deeper I go the darker it gets. [Peter Gabriel]
