function __construct($orderID = -1, $proID = -1)
{
if (self::$conn == Null) {
self::$conn = mysqli_connect('localhost', 'root', 'iti', 'eShop');
}
if ($orderID != -1 && $proID != -1) {
$query = "select * from orderItems where oID={$orderID} and pID={$proID} limit 1";
$result = mysqli_query(self::$conn, $query);
$orderItem = mysqli_fetch_assoc($result);
$this->oID = $orderItem['oID'];
$this->pID = $orderItem['pID'];
}
}