$sth->{hosts_by_name}->execute($hostname);
unless (($hostID) = $sth->{hosts_by_name}->fetchrow_array()) {
$sth->{insert_hosts}->execute(
$sth->{hosts_by_name}->execute($hostname);
unless (($hostID) = $sth->{hosts_by_name}->fetchrow_array()) {
$sth->{insert_hosts}->execute(