On Sat, 11 Apr 2015 21:20:22 -0700
SSC_perl wrote:
> Could someone please explain the difference between:
>
> %{$self->{'DATA'}} = () }
>
> and
>
> $self->{'DATA'} = {}
The first line works on the physical reference $self->{'DATA'} and empties it.
The second one assigns a new empty refe
Hi Frank
I found the first one rather obscure, but they are equivalent. To prove
this, Data::Dumper is my friend:
#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
{
my $self;
print "selfish self \n";
%{$self->{'DATA'}} = ( foo => 'bar' );
print Dumper $self;
}
{
my $self;
On Apr 12, 2015 12:23 AM, "SSC_perl" wrote:
>
> Could someone please explain the difference between:
>
> %{$self->{'DATA'}} = () }
>
The hashref of key "DATA" equals an empty list. The trailing bracket is the
end of the else block. $self is also probably blessed (an object).
ref($self->{
Could someone please explain the difference between:
%{$self->{'DATA'}} = () }
and
$self->{'DATA'} = {}
I was told that they are equivalent, but they're not. One works and
the other doesn't, so they must be different. Here's the context:
sub empty_db {
Hi Alex
Another option: replace `(navigation.target_type, navigation.target_id)`
with `(navigation.html_target_id, navigation.fancyscript_target_id)` only
one of which is defined for any given row, but both of which have foreign
key constraints when they are defined.
In answer to a subset of your
Hi Alex,
Without going into details about your data model in general, then in your case
I would probably create two different navigation tables: one for html and one
for scripts. Then I would be able to create reliable foreign key constraints.
Then, if I wanted a convenient way of selecting all
