在MySQL购物车中减少产品数量

我正在忙于创建购物车php项目，并且我已成功完成向购物车中添加，删除和更新项目，但我坚持的部分是如果用户单击“继续结账“按钮，我希望购物车中的任何东西在数据库中相应减少。例如，如果一个人在他的购物车中： 2 x产品一 3 x产品二在MySQL购物车中减少产品数量

我希望如果销售完成，减少手头的金额。可能有人请帮助这是我下面的购物车代码：

<?php 
session_start(); 
@mysql_connect("localhost","root","") or die("Could not connect to database"); 
@mysql_select_db("bookstore") or die("Could not select database"); 
include("admin/php/myFunctions.php"); 

if(!empty($_GET['prodid'])){ 
    $pid = $_GET['prodid']; 
    $wasFound = false; 
    $i = 0; 
    if(!isset($_SESSION["cart_array"]) || count($_SESSION["cart_array"]) < 1){ 
     $_SESSION["cart_array"]=array(0=>array("productID"=>$pid,"quantity"=>1)); 
    }else{ 
     foreach($_SESSION["cart_array"] as $each_product){ 
      $i++; 
      while(list($key,$value)=each($each_product)){ 
       if($key=="productID" && $value==$pid){ 
        array_splice($_SESSION["cart_array"],$i-1,1,array(array("productID"=>$pid,"quantity"=>$each_product ['quantity']+1))); 
        $wasFound=true; 
       } 
      }  
     } 
     if($wasFound==false){ 
      array_push($_SESSION["cart_array"],array("productID"=>$pid,"quantity"=>1)); 
     } 
    } 
    header("location:shoppingcart.php"); 
    exit(); 
} 
//------------------------------------------------------------------------------------------------- 
$submit = $_POST['btnUpdate']; 
if($submit == "Update"){ 
    $x = 0; 

    foreach($_SESSION["cart_array"] as $each_product){ 
     @$i++; 
     $quantity = $_POST['txtQuan'.$x]; 
     $prodStock = $_POST['txtHoldQuan'.$x]; 
     $prodAdjustId = $_POST['txtHoldProdId'.$x++]; 
     if($quantity<1){ $quantity = 1; } 
     if($quantity>$prodStock){ $quantity = $prodStock; } 
     while(list($key,$value)=each($each_product)){ 
      array_splice($_SESSION["cart_array"],$i-1,1,array(array("productID"=>$prodAdjustId,"quantity"=>$quantity))); 
     }  
    } 


} 
//------------------------------------------------------------------------------------------------- 
if(!empty($_GET['cid']) || isset($_GET['cid'])){ 
    $removeKey = $_GET['cid']; 
    if(count($_SESSION["cart_array"])<=1){ 
     unset($_SESSION["cart_array"]); 
    }else{ 
     unset($_SESSION["cart_array"]["$removeKey"]); 
     sort($_SESSION["cart_array"]); 
    } 
} 
//------------------------------------------------------------------------------------------------- 
$cartTitle = ""; 
$cartOutput = ""; 
$cartTotal = ""; 
if(!isset($_SESSION["cart_array"]) || count($_SESSION["cart_array"]) < 1){ 
    $cartOutput="<h2 align='center'> Your shopping cart is empty </h2>"; 
}else{ 
    $x = 0; 
    $cartTitle .= '<form name="shoppingcart_form" action="shoppingcart.php" method="post" /><table width="700px" cellspacing="0" cellpadding="5"> 
      <tr bgcolor="#CCCCCC"> 
         <th width="220" align="left">Image </th> 
         <th width="140" align="left">Name </th> 
         <th width="100" align="center">Quantity </th> 
         <th width="60" align="center">Stock </th> 
         <th width="60" align="right">Price </th> 
         <th width="60" align="right">Total </th> 
         <th width="90"> </th></tr>'; 
    $i = 0; 
    foreach($_SESSION["cart_array"] as $each_product){ 
     $product_id = $each_product['productID']; 
     $sql=mysql_query("select * from tblproduct where prod_id='$product_id' limit 1"); 
     while($row=mysql_fetch_array($sql)){ 
      $prodNo = $row["prod_no"]; 
      $prodID = $row["prod_id"]; 
      $prodName = $row["prod_name"]; 
      $prodPrice = $row["prod_price"]; 
      $prodQuan = $row["prod_quan"]; 
     } 
     $pricetotal=$prodPrice*$each_product['quantity']; 
     $cartTotal= number_format($pricetotal+$cartTotal,2); 
     $cartOutput .= '<tr><td><img style="border: 2px solid;" src="images/product/'.$prodNo.'.jpg" width="150" height="120" /></td> 
      <td>'.$prodName.'</td> 
      <td align="center"><input type="hidden" name="txtHoldProdId'.$i.'" value="'.$prodID.'" /><input name="txtQuan'.$i.'" type="text" value="'.$each_product['quantity'].'" style="width: 40px; text-align: center" /> </td> 
      <td align="center"><input type="hidden" name="txtHoldQuan'.$i.'" value="'.$prodQuan.'" /> '.$prodQuan .' pcs</td> 
      <td align="right">R '.$prodPrice.'</td> 
      <td align="right">R '.$pricetotal.'</td> 
      <td align="center"> <a href="shoppingcart.php?cid='.$i++.'"><img src="images/remove_x.gif" alt="remove" /><br />Remove</a> </td></tr>'; 
    } 
    $_SESSION['checkoutCartTotal'] = $cartTotal; 
    $cartOutput .= '<tr> 
         <td colspan="3" align="right" height="40px">Have you modified your basket? Please click here to <input class="btn_upd" type="submit" name="btnUpdate" value="Update" />&nbsp;&nbsp;</td> 
         <td align="right" style="background:#ccc; font-weight:bold"> Total: </td> 
         <td colspan="2" align="left" style="background:#ccc; font-weight:bold;">R '.$cartTotal.' </td> 
         <td style="background:#ccc; font-weight:bold"> </td> 
        </tr> 
       </table> 
       <div style="float:right; width: 215px; margin-top: 20px;"> 

        <div class="checkout"><a href="checkout.php" class="more">Proceed to Checkout</a></div> 

       </div></form>'; 
} 
?> 

<!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"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title>Great Selling Book Store</title> 
<link href="css/slider.css" rel="stylesheet" type="text/css" /> 

<link rel="stylesheet" type="text/css" href="css/ddsmoothmenu.css" /> 

<link rel="stylesheet" type="text/css" href="css/styles.css" /> 

<script language="javascript" type="text/javascript"> 

    function clearText(field) 
    { 
     if (field.defaultValue == field.value) field.value = ''; 
     else if (field.value == '') field.value = field.defaultValue; 
    } 
</script> 

</head> 

<body id="subpage"> 

<div id="main_wrapper"> 
    <div id="main_header"> 
     <div id="site_title"><h1><a href="#" rel="nofollow">Great Selling book Store</a></h1></div> 

     <div id="header_right"> 
      <div id="main_search"> 
       <form action="products.php" method="get" name="search_form"> 
        <input type="text" value="Search" name="keyword" onfocus="clearText(this)" onblur="clearText(this)" class="txt_field" /> 
        <input type="submit" name="Search" value="" alt="Search" id="searchbutton" title="Search" class="sub_btn" /> 
       </form> 
      </div> 
     </div> <!-- END --> 
    </div> <!-- END of header --> 

    <div id="main_menu" class="ddsmoothmenu"> 
     <ul> 
      <li><a href="index.php">Home</a></li> 
      <li><a href="products.php">Books</a></li> 
      <li><a class="selected" href="shoppingcart.php">Cart</a></li> 
      <li><a href="checkout.php">Checkout</a></li> 
      <li><a href="about.php">About</a></li> 
     </ul> 
     <br style="clear: left" /> 
    </div> <!-- end of menu --> 

    <div class="cleaner h20"></div> 
    <div id="main_top"></div> 
    <div id="main"> 

     <div id="sidebar"> 
      <h3>Categories</h3> 
      <ul class="sidebar_menu"> 
       <li><a href="index.php?cat=children">Children</a></li>    
       <li><a href="index.php?cat=Horror">Horror</a></li> 
       <li><a href="index.php?cat=Thriller">Thriller</a></li> 
     </ul> 
     </div> <!-- END of sidebar --> 

     <div id="content"> 
     <?php echo $cartTitle; ?> 
     <?php echo $cartOutput; ?> 

     </div> <!-- end of content --> 
     <div class="cleaner"></div> 
    </div> <!-- END of main --> 

    <div id="main_footer"> 
     <div class="cleaner h40"></div> 
     <center> 
      Copyright © 2048 DigitalNinja 
     </center> 
    </div> <!-- END of footer --> 

</div> 


<script type='text/javascript' src='js/logging.js'></script> 
</body> 
</html>

这里是我的表，我用我的数据库：

CREATE TABLE IF NOT EXISTS `tblproduct` (
    `prod_no` int(10) NOT NULL AUTO_INCREMENT, 
    `prod_id` int(15) NOT NULL, 
    `prod_name` varchar(100) NOT NULL, 
    `prod_descr` text NOT NULL, 
    `prod_cat` varchar(100) NOT NULL, 
    `prod_price` float NOT NULL, 
    `prod_quan` int(10) NOT NULL, 
    `date_added` datetime NOT NULL, 
    `ISBN` varchar(100) NOT NULL, 
    PRIMARY KEY (`prod_no`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ; 



INSERT INTO `tblproduct` (`prod_no`, `prod_id`, `prod_name`, `prod_descr`, `prod_cat`, `prod_price`, `prod_quan`, `date_added`, `ISBN`) VALUES 
(1, 1, 'Charlie and the chocolate factory', 'prod description', 'Children', 80, 100, '2016-11-01 08:25:36', '9785811243570'), 
(2, 2, 'Frankenstein', 'Prod description', 'Horror', 120, 80, '2017-05-01 05:27:11', '9781608438037'), 
(3, 3, 'The Girl on the Train', 'Prod Description', 'Thriller', 200, 90, '2017-01-18 04:22:22', '9784062932530');

来源

2017-05-08 MOHAMMED ISMAIL

假设的顺序存储在另一个表，并保持该产品的参考，你应该能够做这样的事情：

UPDATE tblproduct AS p 
INNER JOIN tblorderproducts AS op ON p.product_no = op.product_no 
SET p.prod_quan = p.prod_quan - op.prod_quan 
WHERE op.order_id = [the order id] 
;

注：这可能有一些问题，如果产品能不止一次以相同的顺序出现。

来源

2017-05-08 20:05:09 Uueerdo

好的我在这里遇到问题，我会在哪里放置此代码以使其适用于购物车中的所有商品？ –

我可以告诉你整个网站也 –

@MOHAMMEDISMAIL你会执行此查询后/当销售完成。 – Uueerdo

由你所需要的买家下订单后在您的数据库中输入：

UPDATE `tblproduct` SET prod_quan=prod_quan-$order_count WHERE prod_id=$product_id;

其中$ order_count是订购的数量，$ product_id是订购的产品。为订购的每个产品执行此更新。

来源

2017-05-08 18:25:23

有没有办法添加一个计数器，以便它一次完成所有操作？ –

您需要使用PHP代码编写此代码。下订单后。 –

在MySQL购物车中减少产品数量

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