（二十一）查询我的订单

案例1-查询我的订单(将所属的订单项也要查询出来)
需求:
    点击 页面上的 "我的订单",分页展示我所有的订单(将所属的订单项也要查询出来)
技术分析:
    多表的查询:
        内连接
            格式1:
                select * from a <inner> join b on 连接条件;
            格式2:
                select * from a,b where 连接条件;
        外连接(全部显示一张表的数据，另一张表的数据没有的为null)
            左外连接
                select * from a left <outer> join b on 连接条件;   
        子查询
步骤分析:
    1.修改head.jsp的连接 我的订单，通过分页展示
        /store/order?method=findAllByPage&currPage=?
    2.在orderservlet中编写findAllByPage方法
        获取用户(session)，要判断有没有用户
        获取当前页
        固定pagesize
        调用orderservice根据用户查询所有订单 返回值:Pagebean
        将pagebean放入request域中,请求转发到/jsp/order_list.jsp
    3.在orderService中findAllByPage方法的操作:返回一个pagebean
        封装一个pagebean
            new pagebean(currPage,pageSize,list,totalCount) //前台传来，固定，查询，查询
        调用dao查询list和totalcount    将user.uid传递过去
    4.在orderDao中查询所有的订单
        select * from orders where uid=? limit m,n 可以查询出所有的订单
            结果可以List<Order> list 使用beanListHandler
        遍历所有的订单,根据订单id
            查询订单项表和商品表
                select * from orderitem oi,product p where oi.pid = p.pid and oi.oid = ?
            用mapListhandler封装结果集,然后使用BeanUtils封装成指定的bean对象 ,添加到order的items中即可

 /store/WebContent/jsp/head.jsp

<a href="${pageContext.request.contextPath }/order?method=findAllByPage&currPage=1">我的订单</a></li>

com.louis.web.servlet.OrderServlet

public String findAllByPage(HttpServletRequest request, HttpServletResponse response) throws Exception {
        //1、获取当前页
        int currPage = Integer.parseInt(request.getParameter("currPage"));
        int pageSize = 3;
        
        //2、获取用户
        User user = (User) request.getSession().getAttribute("user");
        if (user == null) {
            request.setAttribute("msg", "您还没有登陆，请登录");
            return "/jsp/msg.jsp";
        }
        
        //3、调用service分页查询 参数：currpage pageSize user 返回值：PageBean
        OrderService orderService = (OrderService) BeanFactory.getBean("OrderService");
        PageBean<Order> bean = orderService.findAllByPage(currPage,pageSize,user);
        
        //4、将pageBean放入到request域中
        request.setAttribute("pb", bean);
       　return "/jsp/order_list.jsp";
    }

com.louis.service.impl.OrderServiceImpl

/**
     * 分页查询订单
     */
    @Override
    public PageBean<Order> findAllByPage(int currPage, int pageSize, User user) throws Exception {
        OrderDao od=(OrderDao) BeanFactory.getBean("OrderDao");
        
        // 查询当前页数据
        List<Order> list=od.findAllByPage(currPage,pageSize,user.getUid());
        
        // 查询总条数
        int totalCount=od.getTotalCount(user.getUid());
        return new PageBean<>(list, currPage, pageSize, totalCount);
    }

 com.louis.dao.impl.OrderDaoImpl

    /**
     * 查询我的订单 分页
     */
    @Override
    public List<Order> findAllByPage(int currPage, int pageSize, String uid) throws Exception {
        QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
        String sql="select * from orders where uid = ? order by ordertime desc limit ? , ?";
        List<Order> list = qr.query(sql, new BeanListHandler<>(Order.class), uid,(currPage-1)*pageSize,pageSize);
        
        //遍历订单集合 封装每个订单的订单项列表
        sql="select * from orderitem oi,product p where oi.pid=p.pid and oi.oid = ?";
        for (Order order : list) {
            //当前订单包含的所有内容
            List<Map<String, Object>> mList = qr.query(sql, new MapListHandler(), order.getOid());
            //map的key:字段名  value:字段值
            for (Map<String, Object> map : mList) {
                //封装product
                Product p=new Product();
                BeanUtils.populate(p, map);
                
                //封装orderItem
                OrderItem oi = new OrderItem();
                BeanUtils.populate(oi, map);
                
                oi.setProduct(p);
                
                //将orderItem对象添加到对应的order对象的list集合中
                order.getItems().add(oi);
            }
        }
        return list;
    }

    /**
     * 获取我的订单的总条数
     */
    @Override
    public int getTotalCount(String uid) throws Exception {
        QueryRunner qr = new QueryRunner(DataSourceUtils.getDataSource());
        String sql="select count(*) from orders where uid = ?";
        return ((Long)qr.query(sql, new ScalarHandler(), uid)).intValue();
    }

/store/WebContent/jsp/order_list.jsp

问

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
    <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!doctype html>
<html>

    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>会员登录</title>
        <link rel="stylesheet" href="${pageContext.request.contextPath}/css/bootstrap.min.css" type="text/css" />
        <script src="${pageContext.request.contextPath}/js/jquery-1.11.3.min.js" type="text/javascript"></script>
        <script src="${pageContext.request.contextPath}/js/bootstrap.min.js" type="text/javascript"></script>
        <!-- 引入自定义css文件 style.css -->
        <link rel="stylesheet" href="${pageContext.request.contextPath}/css/style.css" type="text/css" />

        <style>
            body {
                margin-top: 20px;
                margin: 0 auto;
            }
            
            .carousel-inner .item img {
                 100%;
                height: 300px;
            }
        </style>
    </head>

    <body>

        <!-- 动态包含 -->
    <jsp:include page="/jsp/head.jsp"></jsp:include>

        <div class="container">
            <div class="row">

                <div style="margin:0 auto; margin-top:10px;950px;">
                    <strong>我的订单</strong>
                    <table class="table table-bordered">
                        
                        <c:forEach items="${pb.list }" var="o">
                            <tbody>
                                <tr class="success">
                                    <th colspan="5">订单编号:${o.oid } 订单金额:${o.total }
                                        <c:if test="${o.state==0 }">
                                            <a href="${pageContext.request.contextPath }/order?method=getById&oid=${o.oid}">付款</a>
                                        </c:if>
                                        <c:if test="${o.state==1 }">
                                            已付款
                                        </c:if>
                                        <c:if test="${o.state==2 }">
                                            <a href="#">确认收货</a>
                                        </c:if>
                                        <c:if test="${o.state==3 }">
                                            已完成
                                        </c:if>
                                    </th>
                                </tr>
                                <tr class="warning">
                                    <th>图片</th>
                                    <th>商品</th>
                                    <th>价格</th>
                                    <th>数量</th>
                                    <th>小计</th>
                                </tr>
                                <c:forEach items="${o.items }" var="oi">
                                    <tr class="active">
                                        <td width="60" width="40%">
                                            <input type="hidden" name="id" value="22">
                                            <img src="${pageContext.request.contextPath}/${oi.product.pimage}" width="70" height="60">
                                        </td>
                                        <td width="30%">
                                            <a target="_blank">${oi.product.pname }</a>
                                        </td>
                                        <td width="20%">
                                            ￥${oi.product.shop_price }
                                        </td>
                                        <td width="10%">
                                            ${oi.count }
                                        </td>
                                        <td width="15%">
                                            <span class="subtotal">￥${oi.subtotal }</span>
                                        </td>
                                    </tr>
                                </c:forEach>
                            </tbody>
                        </c:forEach>    
                    </table>
                </div>
            </div>
            <div style="text-align: center;">
                <ul class="pagination">
                    <c:if test="${1==pb.currPage }">
                        <li class="disabled"><a href="javascript:void(0)" aria-label="Previous"><span aria-hidden="true">&laquo;</span></a></li>
                    </c:if>
                    <c:if test="${1!=pb.currPage }">
                        <li><a href="${pageContext.request.contextPath }/order?method=findAllByPage&currPage=${pb.currPage-1}" aria-label="Previous"><span aria-hidden="true">&laquo;</span></a></li>
                    </c:if>
                    
                    <c:forEach begin="1" end="${pb.totalPage }" var="n">
                        <c:if test="${n==pb.currPage }">
                            <li class="active"><a href="javascript:void(0)">${n }</a></li>
                        </c:if>
                        <c:if test="${n!=pb.currPage }">
                            <li><a href="${pageContext.request.contextPath }/order?method=findAllByPage&currPage=${n}">${n }</a></li>
                        </c:if>
                    </c:forEach>
                    <c:if test="${pb.currPage== pb.totalPage }">
                        <li class="disabled">
                            <a href="javascript:void(0)" aria-label="Next">
                                <span aria-hidden="true">&raquo;</span>
                            </a>
                        </li>
                    </c:if>
                    <c:if test="${pb.currPage!= pb.totalPage }">
                        <li>
                            <a href="${pageContext.request.contextPath }/order?method=findAllByPage&currPage=${pb.currPage+1}" aria-label="Next">
                                <span aria-hidden="true">&raquo;</span>
                            </a>
                        </li>
                    </c:if>
                    
                </ul>
            </div>
        </div>

        <div style="margin-top:50px;">
            <img src="${pageContext.request.contextPath}/image/footer.jpg" width="100%" height="78" alt="我们的优势" title="我们的优势" />
        </div>

        <div style="text-align: center;margin-top: 5px;">
            <ul class="list-inline">
                <li><a>关于我们</a></li>
                <li><a>联系我们</a></li>
                <li><a>招贤纳士</a></li>
                <li><a>法律声明</a></li>
                <li><a>友情链接</a></li>
                <li><a target="_blank">支付方式</a></li>
                <li><a target="_blank">配送方式</a></li>
                <li><a>服务声明</a></li>
                <li><a>广告声明</a></li>
            </ul>
        </div>
        <div style="text-align: center;margin-top: 5px;margin-bottom:20px;">
            Copyright &copy; 2005-2016 传智商城 版权所有
        </div>
    </body>

</html>

问题

1、内连接、外连接

2、beanHandler

BeanListHandler

MapListHandler

scalarHandler

3、BeanUtils.populate