my $db = new MyDatabase();

$db->set_filename("test.db");
$db->set_schema("first name","last name","email");

$db->set_entry("testentry",(
    "first name" => "Phi",
    "last name" => "RatE", 
    "email" => 'this@is.a.test.com'));
 
my %entries = $db->list_entries();

for (keys %entries) {
    for my $field (keys %{$entries{$_}}) {
        print "$field -> ".$entries{$_}{$field}."\n";
    }
}