php pdo where子句

Question

I have the following code for selecting from multiple tables where the order number matches.

$orderNumber = $_GET['orderNumber'];

$sql = $db->prepare("
                    SELECT
                        *
                    from `KC_Orders`
                        INNER JOIN
                            `KC_Payments`
                            on KC_Orders.orderNumber = KC_Payments.orderNumber
                        INNER JOIN
                            `KC_OrderStatus`
                            on KC_Orders.orderNumber = KC_OrderStatus.orderNumber
                        INNER JOIN
                            `KC_Statuses`
                            on KC_OrderStatus.statusID = KC_Statuses.statusID
                    WHERE
                        orderNumber= :orderNumber");

$sql->execute(array(':orderNumber' => $orderNumber));
$orderInfo = $sql->fetchAll();

Now when I var_dump($orderInfo); it returns: array(0) { } What is wrong? All the tables include the same $orderNumber field within it. If I take the WHERE part out it works just fine except it returns every row not just one. (obviosly).

Please help us!

Answer 1

You need to specify what the OrderNumber is from, and the * is from (what table). So try this new code:

$sql = $db->prepare("SELECT KC_Orders.* from `KC_Orders` INNER JOIN `KC_Payments` on KC_Payments.orderNumber = KC_Orders.orderNumber INNER JOIN `KC_OrderStatus` on KC_OrderStatus.orderNumber = KC_Order.orderNumber INNER JOIN `KC_Statuses` on KC_Statuses.statusID = KC_OrderStatus.statusID WHERE KC_Orders.orderNumber= :orderNumber");

Answer 2

如果在多个表中存在，那么where子句中的Ordernumber应该具有表前缀

Answer 3

Try this

$orderNumber = (int)$_GET['orderNumber'];

Then where :ordernumber is put $orderNumber

Then execute