Problem with shopcart code

Posted on 16th Feb 2014 by admin

Hello, I am having a bit of trouble being able to add a product to my shopcart. My mysql database is setup correctly with the tables (User, ShopCart, ShopCartLine, Product, Order, OrderLine, etc.).

Right now I am using mode to pass the item number (productID) to the shopcart. In my switch statement i am essentially getting that item number through the variable $action. The problem is my query doesn't work. Another problem is, I am not really sure of the correct way to setup session variables to be equal to the shopcartID in the shopcart table. More specifically, I'm not exactly sure how I can use the session_id() function to implement this. I currently hard coded a userid (from the user table) instead of passing the value through session. That is another issue which I am not concerned with at the moment. I just want to get this shopcart working in a reasonable fashion.

Can somebody give me an idea of what I am doing wrong and or what I need to do to make this work properly? I am really starting to get lost. By the way, I do plan on adding cases to the switch statement for update and delete. Thanks in advance everyone! Here is the code:

Code: <?php include 'db-inc.php'; ?>
<?php include 'header.php'; ?>

<!-- <html>
<head>
<title>Shopping Cart Contents:</title>
<style type="text/css">
th { background-color: #999;}
.odd_row { background-color: #EEE; }
.even_row { background-color: #FFF; }
</style>
<head>
<body>
<h1> Ecommerce Multimedia Store </h1>
-->
<?php
$action = $_GET['mode'];
$ProductID = $_GET['itemno'];
$session = session_id();
$UserID = 1;

//connect to mysql
$db = mysql_connect(MYSQL_HOST, MYSQL_USER, MYSQL_PASSWORD) or
die ('Unable to connect. Check your connection parameters.');

//select database
mysql_select_db(MYSQL_DB) or die(mysql_error($db));

switch ($action) {
case 'add' :
if (!empty($ProductID)) {
$query = 'INSERT INTO ShopCart( UserID )VALUES( $UserID )';
mysql_query($query, $db) or die(mysql_error($db));

$query = ' SELECT ShopCartID FROM ShopCart WHERE UserID = $UserID ORDER BY ShopCartID DESC LIMIT 1'

$query = 'INSERT INTO ShopCartLine(ShopCartID, ProductID, Quantity)VALUES(" . $ShopcartID . '", "' . $ProductID. '", "', "' . $Quantity . '")';
mysql_query($query, $db) or die(mysql_error($db));

}
break;
}


$query = 'SELECT Product.ProductID, Quantity, Title, ListPrice
FROM ShopCartLine JOIN Product ON ShopCartLine.ProductID = Product.ProductID
JOIN ShopCart ON ShopCartLine.ShopCartID=ShopCart.ShopCartID
WHERE ShopCart.ShopCartID = "' . $session . '"
ORDER BY Product.ProductID ASC';
$result = mysql_query($query, $db) or die (mysql_error($db));

$rows = mysql_num_rows($result);
if ($rows == 1) {
echo '<p>You currently have 1 product in your cart.</p>';
} else {
echo '<p>You currently have ' . $rows . ' products in your cart.</p>';
}

if ($rows > 0) {
?>

<table style="width: 75%;">
<tr>
<th style="width: 100px;"> </th><th>Item Name</th><th><Quantity</th>
<th>Price Each</th><th>Extended Price</th>
</tr>
<?php
$total = 0;
$odd = true;
while ($row = mysql_fetch_array($result)) {
echo ($odd == true) ? '<tr class="odd_row">' : '<tr class="even_row">';
$odd = !$odd;
extract($row);
?>
<td><a href="shopcart.php?ProductID=<?php echo $ProductID;?>"><?php
echo $Title; ?></a></td>
<td>
<form method="post" action="shopcartupdate.php">
<div>
<input type="text" name="Quantity" maxlength="2" size="2"
value="<?php echo $Quantity; ?>"/>
<input type="hidden" name="ProductID"
value="<?php echo $ProductID; ?>"/>
<input type="hidden" name="redirect" value="shopcart.php"/>
<input type="submit" name=submit" value="Change Qty"/>
</div>
</form>
</td>
<td style="text-align: right;"> $<?php echo $ListPrice; ?></td>
<td style="text-align: right;"> $<?php echo number_format
($ListPrice * $Quantity, 2); ?>
</td>
</tr>
<?php
$total = $total + $ListPrice * $Quantity;
}
?>
</table>
<p> Your total before shipping is:
<strong>$<?php echo number_format($total, 2); ?></strong></p>
<form method="post" action="checkout.php">
<div>
<input type="submit" name="submit" value="Proceed to Checkout"
style="font-weight: bold;"/>
</div>
</form>
<form method="post" action="shopcartupdate.php">
<div>
<input type="hidden" name="redirect" value="index.php"/>
<input type="submit" name="submit" value="Empty Cart" />
</div>
</form>
<?php
}
?>

<hr/>
<p><a href="index.php">< Back to main page</a></p>
</body>
</html>


<?php include 'footer.php'; ?>

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