编写PDO更新语句的正确方法

Question

Is this the correct way to write a PDO update statement? I based it off a tutorial I saw online but it doesn't seem to be doing anything at all when fired by AJAX (even though the AJAX request is being logged as successful in the console, no update is made to the database):

$duedate = $_POST["duedate"];
$status = $_POST["status"];
$id = $_POST["id"];

$sql = "UPDATE pm_schedule SET duedate=?, status=? WHERE id=?";
$q = $pdo->prepare($sql);
$q->execute(array($duedate,$status,$id));

Answer 1

Yes, it's correct, but you need to tell PDO to raise an error on error.
So, make your connection code like this:

$dsn = "mysql:host=$host;dbname=$db;charset=utf8";
$opt = array(
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
);
$pdo = new PDO($dsn, $user, $pass, $opt);

And make sure you can see PHP errors. So, you'll kn ow what's going wrong.