use strict;
use warnings;

my ($book_id , %booklist_1);

Init_1();
populate_and_print();

Init_2();
populate_and_print();
#--------------------

sub populate_and_print{
	foreach $book_id (keys %booklist_1) {
	
	    my ($update_id, $title) = ( int (100 *rand()), "title" . int (1000 *rand()));
	    $booklist_1{$book_id}{'update_id'} = $update_id;
	    $booklist_1{$book_id}{'title'} = $title;
	
	    print "$book_id > $booklist_1{$book_id}{'update_id'}\n";
	}
	#$sth->finish;
	
	foreach $book_id (keys %booklist_1) {
	    print "XXX $book_id > $booklist_1{$book_id}{'update_id'}\n";
	}
}

sub Init_1{
  %booklist_1=();
  @booklist_1{ 100..104 }
    = ( { title => 'empty', update_id => 'missing' } )
      x 5;
}

sub Init_2{
  %booklist_1=();
  $booklist_1{$_ }
    =  { title => 'empty', update_id => 'missing' } 
      for 100..104;
}