PDO错误处理没有被触发

Question

I have been using the standard PHP error reporting, but decided to attempt a try catch with PDO. I'm going to turn off error reporting with error_reporting(0)and use custom error handling.

My try-catch or !isnull(error) doesn't fire. Can some suggest how to achieve the error handling without the default reporting?

What am i doing wrong?

PHP

    $db = connect();
    try
    {
        foreach ($data['ids'] as $item_id)
        {
            $sql = 
            "UPDATE item 
             SET verified = !verified 
             WHERE item_id = :room_id";  //this line is incorrect and should cause error

            $update = $db -> prepare($sql);
            $update -> bindParam(":item_id", $item_id);
            $update -> execute();
            $error = $db -> errorInfo();
            $update -> closeCursor();
        }
    }
    catch(PDOException $e)
    {
        echo "ERROR : Server Error -". $e -> getMessage();

    }

    if (!is_null($error[2])) 
    {
        echo "Query failed! ". $error[2];
    }