if ( $cookie{host}->value ) {
    $db->do( "UPDATE logs SET visits = visits + 1 WHERE host = ?", $cookie{host}->value ) 
        or die $db->errstr;
}
else {
   $db->do( "INSERT INTO logs VALUES (?, ?, 'index', 1)", $host, $xronos ) 
       or die $db->errstr;
}