Question

我已按照如何创建购物车的说明，我想进行修改，以便购物车系统可以作为餐厅系统供员工记录客户订单，因此系统无需记录顾客信息。当我尝试将所有选择的数据插入表中并且回显成功时，我有错误，但没有数据插入数据库。错误发生在cart.php。

这是错误：

注意：未定义的索引：C：\ xampp \ htdocs \ emakengku \ cart.phpon第7行中的名称

注意：未定义的索引：第8行的数量inC：\ xampp \ htdocs \ emakengku \ cart.php

注意：未定义的索引：C：\ xampp \ htdocs \ emakengku \ cart.phpon第9行中的价格

以下是代码：

index2.php

<?
session_start();
error_reporting(E_ALL);
require("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 HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>


<body>
</body>
</html>

<link rel="stylesheet" href="style2.css" />

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js"></script>

<script type="text/javascript">
$(function() {

});
</script> 
</head>

<body>
<div id="container">

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

</div>

<div id="sidebar">
<h1>Cart</h1>

<?php 
if(isset($_SESSION['cart'])){

$sql="SELECT * FROM products WHERE id_product IN (";

foreach($_SESSION['cart'] as $id => $value) {
$sql.=$id.",";
}
$sql=substr($sql, 0, -1).") ORDER BY name ASC";
$query=mysql_query($sql);
while($row=mysql_fetch_array($query)){

?>
<p><?php echo $row['name'] ?> x <?php echo $_SESSION['cart'][$row['id_product']]['quantity'] ?></p>
<?php }

?>

<hr />
<a href="index2.php?page=cart">Go to Cart</a>


<?php





}else{

echo "<p>Your Cart is empty</p>";

}
?>
</div>

</div>
</body>

Products.php

<?php

    if(isset($_GET['action']) && $_GET['action']=="add"){

        $id=intval($_GET['id']);

        if(isset($_SESSION['cart'][$id])){

            $_SESSION['cart'][$id]['quantity']++;

        }else{

            $sql_s="SELECT * FROM products
                WHERE id_product={$id}";
            $query_s=mysql_query($sql_s);
            if(mysql_num_rows($query_s)!=0){
                $row_s=mysql_fetch_array($query_s);



                    $_SESSION['cart'][$row_s['id_product']]=array(
                            "quantity" => 1,
                            "price" => $row_s['price']

                            );


                }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 name ASC";

$query=mysql_query($sql);

while ($row=mysql_fetch_array($query)) {

?>
<tr>
    <td><?php echo $row['name'] ?></td>
    <td><?php echo $row['description'] ?></td>
    <td>RM <?php echo $row['price'] ?></td>
    <td><a href="index2.php?page=products&action=add&id=<?php echo $row['id_product'] ?>">Add To Cart</a></td>
</tr>
<?php
}
?>

</table>

cart.php

<?php
error_reporting(E_ALL);

require("connection.php");
if(isset($_POST['submit2'])) {

    $name=$_POST["name"];
    $quantity=$_POST["quantity"];
    $price=$_POST["price"];
$sql_insert = "INSERT INTO order (name, quantity, price)  
values('$name', '$quantity', '$price')"; 
mysql_query($sql_insert);  

echo "sucess!";

}

 if(isset($_POST['submit'])){

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



    }
    }


 }

?>



<a href="index2.php?page=products">Go back to product page</a>
<h1>View Cart</h1>

<form method="post" action"index2.php?page=cart">

<table>
<tr>
    <th>Name</th>
    <th>Quantity</th>
    <th>Price</th>
    <th>Item Price</th>



</tr>
<?php

    $sql="SELECT * FROM products WHERE id_product IN (";

foreach($_SESSION['cart'] as $id => $value) {
$sql.=$id.",";
}
$sql=substr($sql, 0, -1).") ORDER BY name ASC";
$query=mysql_query($sql);
$totalprice=0;
while($row=mysql_fetch_array($query)){
    $subtotal=$_SESSION['cart'][$row['id_product']]['quantity']*$row['price'];
    $totalprice+=$subtotal;

?>
<tr>
<td><?php echo $row['name'] ?></td>
<td><input type="text" name="quantity[<?php echo $row['id_product'] ?>]" size="5" value="<?php echo $_SESSION['cart'][$row['id_product']]['quantity'] ?>"</td>
<td>RM <?php echo $row['price'] ?></td>
<td>RM <?php echo $_SESSION['cart'][$row['id_product']]['quantity']*$row['price'] ?></td>



</tr>



<?php 
}

?>
<tr>
<td>Total Price: <?php echo $totalprice  ?></td>


</tr>

</table>
<button type="submit" name="submit"> Update Cart</button>
<button type="submit" name="submit2"> Update Cart</button>


</form>
<br />
<p> To remove an item,set the quantity to 0</p>

Answer 1

您的表单已损坏，您错过了以后尝试在脚本中使用的名称，数量等输入（$_POST['name']等） - 在文件cart.php中。

很难找到它，因为代码很乱，但我没有找到任何带有这些名字的输入。

此外，除了使用已弃用的mysql_*函数等明显的缺陷之外，你真的不应该混合逻辑并以这种方式查看。在渲染表单的过程中进行数据库查询是不对的。

如果您使用了一些MVC框架，它会更清晰。

将数据插入表中时出错

1 个答案: