/**
Datensatz.php
class Datensatz{
private $id ;
private$vorname ;
private $nachname ;
private $email  ;
private $telefon   ;
private $datum;
public function getVorname(){
return $this->vorname;
}
}
**/
$sth->setFetchMode(PDO::FETCH_CLASS, 'Datensatz');
$class = $stmt->fetch();

$class->getVorname();