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<p align="center"><script src="../../1.js"></script></a>
<p align="center"><big><strong>用JSP和数据库做的购物车的源程序</strong></big></p>
<div align="right">摘自《ChinaAsp》（文/asp2001）</div>
<p><span class=smallFont>
下面是我用JSP和数据库做的购物车的源程序：<br>
<br>
注意：<br>
1、重新计费部分还没有做好，大家自己动手吧！<br>
2、下一版本将用session做。<br>
<br>
//shop_cart.jsp<br>
<br>
<%@ page contentType="text/html;charset=gb2312"%><br>
<%@ page session="true" %><br>
<%@ page language="java" import="java.sql.*" %><br>
<jsp:useBean id="bka" scope="page" class="shop.bka" /><br>
<%<br>
<br>
String product_type;<br>
String action;<br>
int product_id;<br>
int curpage;<br>
<br>
//商品类型<br>
if (request.getParameter("product_type")==null){<br>
product_type="all";<br>
}else{<br>
product_type=request.getParameter("product_type");<br>
}<br>
<br>
//页数和商品类型参数，可以在“继续购物”时返回到上次购物的页面<br>
if (request.getParameter("curpage")==null){<br>
curpage=1;<br>
}else{<br>
curpage=java.lang.Integer.parseInt(request.getParameter("curpage"));<br>
}<br>
<br>
//动作<br>
if (request.getParameter("action")==null){<br>
action="view";<br>
}else{<br>
action=request.getParameter("action");<br>
}<br>
<br>
//商品编号<br>
if (request.getParameter("product_id")==null){<br>
product_id=0;<br>
}else{<br>
product_id=java.lang.Integer.parseInt(request.getParameter("product_id"));<br>
}<br>
<br>
int bbb;<br>
bbb=1;<br>
<br>
Integer num = new Integer(bbb);<br>
<br>
//商店编号<br>
session.putValue("shop_id",num);<br>
//顾客username<br>
session.putValue("guest_name","asp2001");<br>
<br>
String guest_name=(String)session.getValue("guest_name");<br>
Integer shop_id=(Integer)session.getValue("shop_id");<br>
<br>
<br>
<br>
java.lang.String sql; <br>
java.sql.ResultSet rs;<br>
<br>
<br>
<br>
if (action.compareTo("add")==0) {<br>
<br>
sql="select cart_quantity from shop_cart where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "' and cart_product_id=" + product_id ;<br>
rs = bka.executeQuery(sql);<br>
if (rs.next()){<br>
int cart_quantity;<br>
cart_quantity=java.lang.Integer.parseInt(rs.getString("cart_quantity"))+1;<br>
sql="update shop_cart set cart_quantity=" + cart_quantity + " where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "' and cart_product_id=" + product_id ;<br>
rs = bka.executeQuery(sql);}<br>
else<br>
{<br>
sql="insert into shop_cart (cart_shop_id,cart_guest_id,cart_product_id,cart_quantity) values ('" + shop_id + "','" + guest_name + "','" + product_id + "',1)";<br>
rs = bka.executeQuery(sql);<br>
}<br>
}<br>
<br>
if (action.compareTo("clear")==0) {<br>
sql="delete from shop_cart where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "'";<br>
rs = bka.executeQuery(sql);<br>
}<br>
<br>
if (action.compareTo("delete")==0) { <br>
sql="delete from shop_cart where cart_shop_id=" + shop_id + " and cart_guest_id='" + guest_name + "' and cart_product_id=" + product_id ;<br>
rs = bka.executeQuery(sql);<br>
}<br>
%><br>
<div align="center"><center><br>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="610" <br>
<br>
height="2"><br>
<tr><br>
<td><form method="POST" <br>
<br>
action="shop_cart.jsp?action=update&product_type=<%=product_type%>&curp<br>
<br>
age=<%=curpage%>"><br>
<table border="0" cellpadding="0" cellspacing="0" width="610" <br>
<br>
height="2"><br>
<tr><br>
<td width="122" height="7"><div align="center"><center><table <br>
<br>
border="1" cellpadding="2" cellspacing="0" width="100%" bordercolorlight="#FFB468" <br>
<br>
bordercolordark="#FFFFFF" bgcolor="#FFB468"><br>
<tr><br>
<td width="100%"><div <br>
<br>
align="center"><center><p>购物车</td><br>
</tr><br>
</table><br>
</center></div></td><br>
<td width="122" height="7" style="border: medium" <br>
<br>
align="center"><div align="center"><center><table<br>
border="1" cellpadding="2" cellspacing="0" width="100%" <br>
<br>
bordercolorlight="#FFB468"<br>
bordercolordark="#FFFFFF" bgcolor="#FFB468"><br>
<tr><br>
<td width="100%"><div align="center"><center><p><a <br>
<br>
href="shop_list.jsp?shop_id=<%=shop_id%>&product_type=<%=product_type%><br>
<br>
&curpage=<%=curpage%>">继续购物</a></td><br>
</tr><br>
</table><br>
</center></div></td><br>
<td width="122" height="7" style="border: medium" <br>
<br>
align="center"><div align="center"><center><table<br>
border="1" cellpadding="2" cellspacing="0" width="100%" <br>
<br>
bordercolorlight="#FFB468"<br>
bordercolordark="#FFFFFF" bgcolor="#FFB468"><br>
<tr><br>
<td width="100%"><div align="center"><center><p><a <br>
<br>
href="javascript: document.forms[0].submit()">重新计费</a></td><br>
</tr><br>
</table><br>
</center></div></td><br>
<td width="122" height="7" style="border: medium" <br>
<br>
align="center"><div align="center"><center><table<br>
border="1" cellpadding="2" cellspacing="0" width="100%" <br>
<br>
bordercolorlight="#FFB468"<br>
bordercolordark="#FFFFFF" bgcolor="#FFB468"><br>
<tr><br>
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