3.19练习苍穹外卖

今天没有学习什么新知识 依旧是练习业务需求分析和处理
主要完成的是订单添加功能 就是业务比较复杂一些
但其实也不复杂多少 这是相对而言最复杂的业务逻辑代码了.
package com.sky.service.impl;

import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.OrdersSubmitDTO;
import com.sky.entity.AddressBook;
import com.sky.entity.OrderDetail;
import com.sky.entity.Orders;
import com.sky.entity.ShoppingCart;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.AddressBookMapper;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.OrderService;
import com.sky.vo.OrderSubmitVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

@Service
public class OrderServiceImpl implements OrderService {

@Autowired
private OrderMapper orderMapper;

@Autowired
private OrderDetailMapper orderDetailMapper;

@Autowired
private AddressBookMapper addressBookMapper;

@Autowired
private ShoppingCartMapper shoppingCartMapper;

/**
 * 用户下单
 * @param ordersSubmitDTO
 * @return
 */
@Transactional
@Override
public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {

    //1.处理各种业务异常 地址簿为空 购物车数据为空
    AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
    if (addressBook == null){
        //抛出业务异常
        throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
    }

    //查询用户购物车数据
    ShoppingCart shoppingCart = new ShoppingCart();
    Long currentId = BaseContext.getCurrentId();
    shoppingCart.setUserId(currentId);
    List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
    if (shoppingCartList == null || shoppingCartList.size() == 0){
        //抛出业务异常
        throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
    }

    //2.向订单表插入一条数据
    Orders orders = new Orders();
    BeanUtils.copyProperties(ordersSubmitDTO,orders);
    orders.setOrderTime(LocalDateTime.now());
    orders.setPayStatus(Orders.UN_PAID);
    orders.setStatus(Orders.PENDING_PAYMENT);
    orders.setNumber(String.valueOf(System.currentTimeMillis()));
    orders.setPhone(addressBook.getPhone());
    orders.setAddress(addressBook.getDetail());
    orders.setConsignee(addressBook.getConsignee());
    orders.setUserId(currentId);

    orderMapper.insert(orders);
    List<OrderDetail> orderDetailList = new ArrayList<>();
    //3.向订单明细表插入N条数据
    for(ShoppingCart cart : shoppingCartList){
        OrderDetail orderDetail = new OrderDetail();
        BeanUtils.copyProperties(cart,orderDetail);
        orderDetail.setOrderId(orders.getId());//设置当前订单明细关联的订单id
        orderDetailList.add(orderDetail);
    }
    orderDetailMapper.insertBatch(orderDetailList);

    //4.清空当前购物车信息
    shoppingCartMapper.deleteByUserId(currentId);

    //5.封装VO返回结果
    OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
            .id(orders.getId())
            .orderTime(orders.getOrderTime())
            .orderNumber(orders.getNumber())
            .orderAmount(orders.getAmount())
            .build();
    return orderSubmitVO;
}

}