use strict;

use Tie::IxHash;

tie( my %csv, 'Tie::IxHash',

  'one'   => undef,
  'two'   => undef,
  'three' => undef,
  'four' => undef,
  'five' => undef,
  );

my %login;

{
  my %dummy = %csv;
  $dummy{one} = "11";
  $dummy{two} = "12";
  $dummy{three} = "13";
  $dummy{four} = "14";
  $dummy{five} = "15";

  $login{1} = \%dummy;
}

{
  my %dummy = %csv;
  $dummy{one} = "11";
  $dummy{two} = "12";
  $dummy{three} = "23";
  $dummy{four} = "14";
  $dummy{five} = "25";

  $login{2} = \%dummy;
}

{

  my %dummy = %csv;
  $dummy{one} = "31";
  $dummy{two} = "12";
  $dummy{three} = "23";
  $dummy{four} = "34";
  $dummy{five} = "25";
 
  $login{2} = \%dummy;
  
  while (my ($k,$v) = each %login) {
      print "NEW\n";
      while ( my ($k, $v) = each %{dummy} ) { print $k." =". $v ."\n"; }
  }
}

##</code><code>##

NEW
one =11
five =12
three =13
two =13
four =14
five =15
NEW
one =31
five =25
three =23
two =12
four =34
five =25