Question

我正在尝试设置订单，客户输入任何数量，因此我的库存会更新，从而保留下一位客户的当前金额，我一直在努力想出正确的代码，但到目前为止还没有运气。任何建议将不胜感激，这是我的代码：

<?php
session_start(); //Lets start a session! This is the index page
$_SESSION["access"] = "My_session";
//We need a header right, well here it is?
define ("TITLE", "Products page");
include('templates/header.html');
?>
<h2 class="intro">
    Looking for the perfect widget for the perfect person? Browse through our small but original
    list of products to purchase. Alternatively you can contact us through our contact page and one of our team will get
    back to you as soon as possible.
    WIDGET ORDER FORM Widget Quantity Cost Dehydrated water " /> $ 18.50 Glass Stems " /> $ 28.50

    <?php
    // Get the values from the $_POST array:
    $quantityarray = ((isset($_POST['f_wa']) ? $_POST['f_wa'] : '') || (isset($_POST['f_gl']) ? $_POST['f_gl'] : ''));

    include 'connection.php';

    # Define the SQL statement
    $query = 'Select ProductID, InStock from Inventory ORDER BY ProductID';
    if ($result = mysql_query($query)) {
        while ($row = mysql_fetch_array($result)) {
            $currentnum = $row['InStock'] - $quantityarray[$row['ProductID']];
            $prodid = $row['ProductID'];
            // execute a SQL statement to update the InStock number
            $query = "UPDATE Inventory SET InStock = $currentnum WHERE ProductID=$prodid";
            sendquery($query);
        }
    }

    function sendquery($query)
    {
        if (@mysql_query($query)) {
            print '<p>Table populated.</p>';
        } else {
            print '<p style="color:red;">Error executing SQL statement: <br/>' . mysql_error() . '.</p>

    <p>The statement being run was: ' . $query . '</p>';
        }
    }

    ?>
    <?php
    //To conclude we also need the footer, don't we?.
    include('templates/footer.html');
    ?>

Answer 1

你永远不会得到$productquantity数组。您的陈述将评估为真或假：

$quantityarray = ((isset($_POST['f_wa']) ? $_POST['f_wa'] : '') || (isset($_POST['f_gl']) ? $_POST['f_gl'] : ''));

此语句中的||表示如果第一个语句或第二个语句为true，则将$quantityarray设置为true，否则将$quantityarray设置为false

您应该var_dump($quantityarray)看到这一点。

更新数据表中的数量

1 个答案: