foreach $addr (@addr){
    $addr_lookup = "SELECT u2addr.id FROM u2addr WHERE u2addr.addr = \"$addr\";";
    $stm = $dbh->prepare($addr_lookup);
    $stm->execute;
    @results=();
    @row=();
    while (my @row = $stm->fetchrow_array){
      push (@results, @row);
    }#end of while
    $stm->finish;
    print $results[-1];
    }