[Mysql] Pdo e try-catch

[whisher]

try{
//preparo la query
$res = $DB->prepare('SELECT id FROM user;');
//la eseguo
$res->execute();
  while($row = $res->fetch(PDO::FETCH_OBJ)){
    echo $row->id;
  }
  $res = null;
//col catch verifico eventuali errori
}catch(PDOException $e){
  echo $e->getMessage();
}