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Building A Persistent Shopping Cart With PHP and MySQL
i used this tutorial to build a shopping cart. however when i click on the add item button i get to the shopping cart page but the item does not get added. i have my items table is called Products and its attributes are ProdID (primary key), Product, Prodname, Prodtype, Supplier, Price.
here is my cart.php code
PHP Code:
<?php
include("db.php");
switch($_GET["action"])
{
case "add_item":
{
AddItem($_GET["id"], $_GET["qty"]);
ShowCart();
break;
}
case "update_item":
{
UpdateItem($_GET["id"], $_GET["qty"]);
ShowCart();
break;
}
case "remove_item":
{
RemoveItem($_GET["id"]);
ShowCart();
break;
}
default:
{
ShowCart();
}
}
function AddItem($ProdID, $qty)
{
// Will check whether or not this item
// already exists in the cart table.
// If it does, the UpdateItem function
// will be called instead
//global $dbServer, $dbUser, $dbPass, $dbName;
// Get a connection to the database
//$cxn = @ConnectToDb($dbServer, $dbUser, $dbPass, $dbName);
// Check if this item already exists in the users cart table
$result = mysql_query("select count(*) from cart where cookieID = '" . GetCartID() . "' and ProdID = $ProdID");
$row = mysql_fetch_row($result);
$numRows = $row[0];
if($numRows == 0)
{
// This item doesn't exist in the users cart,
// we will add it with an insert query
@mysql_query("insert into cart(cookieID, ProdID, qty) values('" . GetCartID() . "', $ProdID, $qty)");
}
else
{
// This item already exists in the users cart,
// we will update it instead
UpdateItem($ProdID, $qty);
}
}
function UpdateItem($ProdID, $qty)
{
// Updates the quantity of an item in the users cart.
// If the qutnaity is zero, then RemoveItem will be
// called instead
//global $dbServer, $dbUser, $dbPass, $dbName;
// Get a connection to the database
//$cxn = @ConnectToDb($dbServer, $dbUser, $dbPass, $dbName);
if($qty == 0)
{
// Remove the item from the users cart
RemoveItem($ProdID);
}
else
{
mysql_query("update cart set qty = $qty where cookieID = '" . GetCartID() . "' and ProdID = $ProdID");
}
}
function RemoveItem($ProdID)
{
// Uses an SQL delete statement to remove an item from
// the users cart
//global $dbServer, $dbUser, $dbPass, $dbName;
// Get a connection to the database
//$cxn = @ConnectToDb($dbServer, $dbUser, $dbPass, $dbName);
mysql_query("delete from cart where cookieID = '" . GetCartID() . "' and ProdID = $ProdID");
}
function ShowCart()
{
// Gets each item from the cart table and display them in
// a tabulated format, as well as a final total for the cart
//global $dbServer, $dbUser, $dbPass, $dbName;
// Get a connection to the database
//$cxn = @ConnectToDb($dbServer, $dbUser, $dbPass, $dbName);
$totalCost = 0;
$result = mysql_query("select * from cart inner join Products on cart.ProdID = Products.ProdID where cart.cookieID = '" . GetCartID() . "' order by Products.Prodname asc");
?>
<html>
<head>
<title> Your Shopping Cart </title>
<script language="JavaScript">
function UpdateQty(item)
{
ProdID = item.name;
newQty = item.options[item.selectedIndex].text;
document.location.href = 'cart.php?action=update_item&id='+ProdID+'&qty='+newQty;
}
</script>
</head>
<body bgcolor="#ffffff">
<h1>Your Shopping Cart</h1>
<form name="frmCart" method="get">
<table width="100%" cellspacing="0" cellpadding="0" border="0">
<tr>
<td width="15%" height="25" bgcolor="red">
<font face="verdana" size="1" color="white">
<b>Qty</b>
</font>
</td>
<td width="55%" height="25" bgcolor="red">
<font face="verdana" size="1" color="white">
<b>Product</b>
</font>
</td>
<td width="20%" height="25" bgcolor="red">
<font face="verdana" size="1" color="white">
<b>Price Each</b>
</font>
</td>
<td width="10%" height="25" bgcolor="red">
<font face="verdana" size="1" color="white">
<b>Remove?</b>
</font>
</td>
</tr>
<?php
while($row = mysql_fetch_array($result))
{
// Increment the total cost of all items
$totalCost += ($row["qty"] * $row["Price"]);
?>
<tr>
<td width="15%" height="25">
<font face="verdana" size="1" color="black">
<select name="<?php echo $row["ProdID"]; ?>" onChange="UpdateQty(this)">
<?php
for($i = 1; $i <= 20; $i++)
{
echo "<option ";
if($row["qty"] == $i)
{
echo " SELECTED ";
}
echo ">" . $i . "</option>";
}
?>
</select>
</font>
</td>
<td width="55%" height="25">
<font face="verdana" size="1" color="black">
<?php echo $row["Prodname"]; ?>
</font>
</td>
<td width="20%" height="25">
<font face="verdana" size="1" color="black">
$<?php echo number_format($row["Price"], 2, ".", ","); ?>
</font>
</td>
<td width="10%" height="25">
<font face="verdana" size="1" color="black">
<a href="cart.php?action=remove_item&id=<?php echo $row["ProdID"]; ?>">Remove</a>
</font>
</td>
</tr>
<?php
}
// Display the total
?>
<tr>
<td width="100%" colspan="4">
<hr size="1" color="red" NOSHADE>
</td>
</tr>
<tr>
<td width="70%" colspan="2">
<font face="verdana" size="1" color="black">
<a href="order2.php"><< Keep Shopping</a>
</font>
</td>
<td width="30%" colspan="2">
<font face="verdana" size="2" color="black">
<b>Total: $<?php echo number_format($totalCost, 2, ".", ","); ?></b>
</font>
</td>
</tr>
</table>
</form>
</body>
</html>
<?php
}
?>
can anyone help?
Thanx
Last edited by stumpy : March 20th, 2004 at 04:19 AM.
Reason: Place your code in code tags or your post may be removed.
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March 19th, 2004, 10:28 AM
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