my @results;
my $hr_addresses = $dbh->selectall_hashref("SELECT addr, id FROM u2addr", "addr");
if (!defined $hr_addresses) { die("Error executing query: " . $dbh->errstr); }
foreach my $addr (@addr) {
	if (defined $hr_addresses->{$addr}) {
		push(@results, $hr_addresses->{$addr})
	} else {
		print("Error, ID of address [$addr] not found\n");
	}
}