my $sql = "SELECT id FROM names WHERE first = ?";
  my $sth = $dbh->prepare( $sql );
  if ( $sth && $sth->execute( $c_first ) ) {
    while ( my $row = $sth->fetchrow_arrayref() ) {
      print( "$c_first => " . $row->[0] . "\n" );
    }
    $sth->finish();
  }