购物车无法正常运作

时间:2015-05-12 21:16:18

标签: php html mysql sql database

我的购物车没有完全正常工作。数据库连接正在运行,产品及其数据显示在表格中。但是,我无法在购物车中添加任何内容。购物车由index.php,cart.php,products.php。

组成

Index.php看起来像这样:

<?php

	error_reporting(E_ALL); ini_set('display_errors', 1);
	
	session_start();
	require("includes/connection.php");
	if(isset($_GET['page'])){
		
		$pages=array("products", "cart");
		
		if(in_array($_GET['page'], $pages)) {
			
			$_page=$_GET['page'];
			
		}else{
			
			$_page="products";
			
		}
		
	}else{
		
		$_page="products";
		
	}

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<link rel="stylesheet" href="css/reset.css" />
	<link rel="stylesheet" href="css/style.css" />
	
	<title>Shopping Cart</title>
	

</head>

<body>
	
	<div id="container">

		<div id="main">
			
			<?php require($_page.".php"); ?>

		</div><!--end of main-->
		
		<div id="sidebar">
			<h1>Cart</h1>
			<?php
			
				if(isset($_SESSION['cart'])){
					
					$sql="SELECT * FROM products WHERE productCode IN (";
					
					foreach($_SESSION['cart'] as $id => $value) {
						$sql.=$id.",";
					}
					
					$sql=substr($sql, 0, -1).") ORDER BY productName ASC";
					$query=mysql_query($sql) or die(mysql_error());
					while($row=mysql_fetch_array($query)){
						
					?>
						<p><?php echo $row['productName'] ?> x <?php echo $_SESSION['cart'][$row['productCode']]['quantity'] ?></p>
					<?php
						
					}
				?>
					<hr />
					<a href="index.php?page=cart">Go to cart</a>
				<?php
					
				}else{
					
					echo "<p>Your Cart is empty. Please add some products.</p>";
					
				}
			
			?>
			
		</div><!--end of sidebar-->

	</div><!--end container-->

</body>
</html>

Cart.php看起来像这样:

<?php

	error_reporting(E_ALL); ini_set('display_errors', 1);

	if(isset($_POST['submit'])){
		
		foreach($_POST['quantity'] as $key => $val) {
			if($val==0) {
				unset($_SESSION['cart'][$key]);
			}else{
				$_SESSION['cart'][$key]['quantity']=$val;
			}
		}
		
	}

?>

<h1>View cart</h1>
<a href="index.php?page=products">Go back to products page</a>
<form method="post" action="index.php?page=cart">
    
	<table>
	    
		<tr>
		    <th>Name</th>
		    <th>Quantity</th>
		    <th>Price</th>
		    <th>Items Price</th>
		</tr>
		
		<?php
		
			$sql="SELECT * FROM products WHERE productCode IN (";
					
					foreach($_SESSION['cart'] as $id => $value) {
						$sql.=$id.",";
					}
					
					$sql=substr($sql, 0, -1).") ORDER BY productName ASC";
					$query=mysql_query($sql) or die(mysql_error());
					$totalprice=0;
					while($row=mysql_fetch_array($query)){
						$subtotal=$_SESSION['cart'][$row['productCode']]['quantity']*$row['buyPrice'];
						$totalprice+=$subtotal;
					?>
						<tr>
						    <td><?php echo $row['productName'] ?></td>
						    <td><input type="text" name="quantity[<?php echo $row['productCode'] ?>]" size="5" value="<?php echo $_SESSION['cart'][$row['productCode']]['quantity'] ?>" /></td>
						    <td><?php echo $row['buyPrice'] ?>$</td>
						    <td><?php echo $_SESSION['cart'][$row['productCode']]['quantity']*$row['buyPrice'] ?>$</td>
						</tr>
					<?php
						
					}
		?>
					<tr>
					    <td>Total Price: <?php echo $totalprice ?></td>
					</tr>
		
	</table>
	<br />
	<button type="submit" name="submit">Update Cart</button>
</form>
<br />
<p>To remove an item set it's quantity to 0. </p>

而products.php看起来像这样:

<?php

	error_reporting(E_ALL); ini_set('display_errors', 1);

	if(isset($_GET['action']) && $_GET['action']=="add"){
		
		$id=intval($_GET['id']);
		
		if(isset($_SESSION['cart'][$id])){
			
			$_SESSION['cart'][$id]['quantity']++;
			
		}else{
			
			$sql_s="SELECT * FROM products
				WHERE productCode={$id}";
			$query_s=mysql_query($sql_s) or die(mysql_error());
			if(mysql_num_rows($query_s)!=0){
				$row_s=mysql_fetch_array($query_s);
				
				$_SESSION['cart'][$row_s['productCode']]=array(
						"quantity" => 1,
						"price" => $row_s['buyPrice']
					);
				
				
			}else{
				
				$message="This product id it's invalid!";
				
			}
			
		}
		
	}

?>
	<h1>Product List</h1>
	<?php
		if(isset($message)){
			echo "<h2>$message</h2>";
		}
	?>
			<table>
			    <tr>
			        <th>Name</th>
			        <th>Description</th>
			        <th>Price</th>
			        <th>Action</th>
			    </tr>
			    
				<?php
				
					$sql="SELECT * FROM products ORDER BY productName ASC";
					$query=mysql_query($sql) or die(mysql_error());
					
					while ($row=mysql_fetch_array($query)) {
						
				?>
						<tr>
						    <td><?php echo $row['productName'] ?></td>
						    <td><?php echo $row['productDescription'] ?></td>
						    <td><?php echo $row['buyPrice'] ?>$</td>
						    <td><a href="index.php?page=products&action=add&id=<?php echo $row['productCode'] ?>">Add to cart</a></td>
						</tr>
				<?php
						
					}
				
				?>
			    
			</table>

我启用了错误报告,我收到以下错误:

Unknown column 'S10_1678' in 'where clause'

我的数据库中的表'products'如下所示: http://i.stack.imgur.com/KrB8a.png

在我看来,代码中的所有内容都是正确的,但这里出了什么问题?

1 个答案:

答案 0 :(得分:0)

请尝试在$ id周围的sql语句中添加引号 - 我知道在你的情况下它是一个字符串(productCode),如下所示:

foreach($_SESSION['cart'] as $id => $value) {
                        $sql.="'".$id."',";
                    }