1.页面效果展示

实现效果如下

• 订单管理页面
  
• 产品管理页面
  

2.具体实现

2.1 订单管理模块

2.1.1 订单展示页面

点击订单管理，url跳转地址如下所示：

• web层代码

 //分页的写法
    @RequestMapping("/findAll.do")
    @Secured("ROLE_ADMIN")
    public ModelAndView findAll(@RequestParam(name = "page", required = true, defaultValue = "1") Integer page, @RequestParam(name = "size", required = true, defaultValue = "4") Integer size) throws Exception {
        ModelAndView mv = new ModelAndView();
        List<Orders> ordersList = ordersService.findAll(page, size);
        //PageInfo就是一个分页Bean
        PageInfo pageInfo = new PageInfo(ordersList);
        mv.addObject("pageInfo", pageInfo);
        mv.setViewName("orders-page-list");
        return mv;
    }

• service层

    @Override
    public List<Orders> findAll(int page,int size) throws Exception {
        //参数PageNum是页码值 参数pageSize代表是每页显示条数
        PageHelper.startPage(page,size);//这行代码必须写在真正调用分页的代码之前
        return ordersDao.findAll();
    }

• dao层
  
  由于页面的数据展示涉及到两张表的内容，分别是orders表和product表，这两张表的关系如下图所示：
  
  因此在查询时需要两张表联合查询：

 @Select("select * from orders")
    @Results({
            @Result(id = true, property = "id", column = "id"),
            @Result(property = "orderNum", column = "orderNum"),
            @Result(property = "orderTime", column = "orderTime"),
            @Result(property = "orderStatus", column = "orderStatus"),
            @Result(property = "peopleCount", column = "peopleCount"),
            @Result(property = "payType", column = "payType"),
            @Result(property = "orderDesc", column = "orderDesc"),
            @Result(property = "product", column = "productId", javaType = Product1.class, one = @One(select = "com.GTMStudio.admintelssm.dao.IProductDao.findById"))
    })
    List<Orders> findAll() throws Exception;

    //根据id查询产品
    @Select("select * from product where id=#{id}")
    public Product1 findById(String id) throws Exception;

2.1.2 订单详情页面

实现效果

在页面上点击详情后的跳转路径如下图所示：

• web层

  @RequestMapping("/findById.do")
    public ModelAndView findById(@RequestParam(name = "id", required = true) String id) throws Exception {
        ModelAndView mv = new ModelAndView();
        Orders orders = ordersService.findById(id);
        mv.addObject("orders", orders);
        mv.setViewName("orders-show");
        return mv;

    }

• service层

   @Override
    public Orders findById(String id) throws Exception {
        return ordersDao.findById(id);
    }

• dao层
  如下图所示，详情页面涉及到了三张表：product表、orders表、travellers表和members表，dao层三表联合查询
  
  上述三张表的关系如下图所示：
  

dao层代码

    @Select("select * from orders where id=#{id}")
    @Results({
            @Result(id = true, column = "id", property = "id"),
            @Result(column = "orderNum", property = "orderNum"),
            @Result(column = "orderTime", property = "orderTime"),
            @Result(column = "orderStatus", property = "orderStatus"),
            @Result(column = "peopleCount", property = "peopleCount"),
            @Result(column = "payType", property = "payType"),
            @Result(column = "orderDesc", property = "orderDesc"),
            @Result(column = "productId", property = "product", one = @One(select = "com.GTMStudio.admintelssm.dao.IProductDao.findById")),
            @Result(column = "id", property = "travellers", many = @Many(select = "com.GTMStudio.admintelssm.dao.ITravellerDao.findByOrdersId")),
            @Result(column = "memberId", property = "members",    one = @One(select = "com.GTMStudio.admintelssm.dao.IMemberDao.findById"))
    })
    Orders findById(String id);

    //根据id查询产品
    @Select("select * from product where id=#{id}")
    public Product1 findById(String id) throws Exception;

    @Select("select * from traveller where id in(select travellerId from order_traveller where orderId=#{ordersId})")
    List<Traveller> findByOrdersId(String ordersId) throws Exception;

    @Select("select * from members where id=#{id}")
    Members findById(String id) throws Exception;