(2) 增加、删除、修改

核心代码：
insert.jsp

  <body>
    <form action="pre_insert.jsp" method="post">
        商品编号:<input type="text" name="p_id"/><br>
        商品类别:<input type="text" name="p_type"/><br>
        商品名称:<input type="text" name="p_name"/><br>
        商品价格:<input type="text" name="p_price"/><br>
        商品数量:<input type="text" name="p_quantity"/><br>
        图片路径:<input type="text" name="p_image"/><br>
        商品描述:<input type="text" name="p_description"/><br>
        <input type="submit" value="添加"/>
    </form>
  </body>

do_inset.jsp

  <body>
    <% 
        String JDriver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
        String connectDB = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=ShopSystem";
        try{
            Class.forName(JDriver);
        }catch(ClassNotFoundException e){
            System.out.println("加载数据库引擎失败");
            System.exit(0);
        }

        try{
            String user = "sa";
            String password = "xuelong";
            Connection con = DriverManager.getConnection(connectDB, user, password);
            System.out.println("数据库连接成功");
            
            Statement stmt = con.createStatement();
            
            //设置编码格式，处理中文乱码
            request.setCharacterEncoding("UTF-8");
            response.setContentType("text/html;charset=UTF-8");
  
            String p_id=request.getParameter("p_id");
            String p_type=request.getParameter("p_type");
            String p_name=request.getParameter("p_name");
            float p_price=Float.parseFloat(request.getParameter("p_price"));
            int p_quantity=Integer.parseInt(request.getParameter("p_quantity"));
            String p_image=request.getParameter("p_image");
            String p_description=request.getParameter("p_description");
            //获取时间
            Date date = new Date();
            SimpleDateFormat time = new SimpleDateFormat("yyyy-MM-dd");
            String p_time=time.format(date);
            
/*          插入数据
            String strSql="insert into product values('"+p_id+"','"+p_type+"','"+p_name+"','"+p_price+"','"+p_quantity+"','"+
                p_image+"','"+p_description+"','"+p_time+"')";*/
                
/*          根据编号删除数据        
            String strSql="delete product where p_id='"+p_id+"'"; */
            
            //修改数据
            String strSql="update product set p_type='"+p_type+"',p_name='"+p_name+"',p_price='"+p_price+"',p_quantity='"+
                p_quantity+"',p_image='"+p_image+"',p_description='"+p_description+"',p_time='"+p_time+"' where p_id='"+p_id+"'";
            
            int intTemp=stmt.executeUpdate(strSql);
            if(intTemp!=0){
                out.println("商品添加成功！");
            }else{
                out.println("商品添加失败！");
            }                   
            stmt.close();
            con.close();
        }catch(Exception e){
            out.println(e.toString());
        }
  %>    
  </body>

(2) 增加、删除、修改

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