So far I have the code below and when the user clicks on add to cart the data is added into the database and every thing seems fine, However When I try to view the cart I get this error message: Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in c:\inetpub\wwwroot\benefits\catalogue\cart\cart.php on line 155 The link I use to send the product data to the cart table is as follows: cart.php?action=add_item&id=57&qty=1 As I say the details are added to the database but when viewing the cart page I get the above error message. Could some one please look at the code and see If im missing anything, Thanks,
Regards,
Bobby
Code: Select all
<?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($id, $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 id = $id");
$row = mysql_fetch_row($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, id, qty) values('" . GetCartId() . "', $id, $qty)");
}
else
{
// This item already exists in the users cart,
// we will update it instead
UpdateItem($id, $qty);
}
}
function UpdateItem($id, $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($id);
}
else
{
mysql_query("update cart set qty = $qty where cookieId = '" . GetCartId() . "' and id = $id");
}
}
function RemoveItem($id)
{
// 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 id = $id");
}
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;
$result = mysql_query("select * from cart inner join items on cart.id = products.id where cart.cookieId = '" . GetCartId() . "' order by products.name asc");
?>
<html>
<head>
<title> Your Shopping Cart </title>
<script language="JavaScript">
function UpdateQty(item)
{
id = item.name;
newQty = item.options[item.selectedIndex].text;
document.location.href = 'cart.php?action=update_item&id='+id+'&qty='+newQty;
}
</script>
</head>
<body bgcolor="#ffffff">
<h1>Your Shopping Cart</h1>
<form name="frmCart" method="get">
<table width="100%" cellspacing="0" cellpadding="0" border="0">
<tr>
<td width="15%" height="25" bgcolor="red">
<font face="verdana" size="1" color="white">
<b>Qty</b>
</font>
</td>
<td width="55%" height="25" bgcolor="red">
<font face="verdana" size="1" color="white">
<b>Product</b>
</font>
</td>
<td width="20%" height="25" bgcolor="red">
<font face="verdana" size="1" color="white">
<b>Price Each</b>
</font>
</td>
<td width="10%" height="25" bgcolor="red">
<font face="verdana" size="1" color="white">
<b>Remove?</b>
</font>
</td>
</tr>
<?php
while($row = mysql_fetch_array($result))
{
// Increment the total cost of all items
$totalCost += ($row["qty"] * $row["price"]);
?>
<?php do { ?>
<tr>
<td width="15%" height="25">
<font face="verdana" size="1" color="black">
<select name="<?php echo $row["id"]; ?>" onChange="UpdateQty(this)">
<?php
for($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_cart['name']; ?>
</font>
</td>
<td width="20%" height="25">
<font face="verdana" size="1" color="black">
</font>
</td>
<td width="10%" height="25">
<font face="verdana" size="1" color="black">
<a href="cart.php?action=remove_item&id=<?php echo $row["id"]; ?>">Remove</a>
</font>
</td>
</tr>
<?php } while ($row_cart = mysql_fetch_assoc($cart)); ?>
<?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="products.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
}
?>Code: Select all
<?php
// This page contains the connection routine for the
// database as well as getting the ID of the cart, etc
$dbServer = "localhost";
$dbUser = "root";
$dbPass = "*******";
$dbName = "benefits";
function ConnectToDb($server, $user, $pass, $database)
{
// Connect to the database and return
// true/false depending on whether or
// not a connection could be made.
$s = @mysql_connect($server, $user, $pass);
$d = @mysql_select_db($database, $s);
if(!$s || !$d)
return false;
else
return true;
}
function GetCartId()
{
// This function will generate an encrypted string and
// will set it as a cookie using set_cookie. This will
// also be used as the cookieId field in the cart table
if(isset($_COOKIE["cartId"]))
{
return $_COOKIE["cartId"];
}
else
{
// There is no cookie set. We will set the cookie
// and return the value of the users session ID
session_start();
setcookie("cartId", session_id(), time() + ((3600 * 24) * 30));
return session_id();
}
}
?>