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package com.example.service;
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import cn.hutool.core.util.ObjectUtil;
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import com.example.common.enums.ResultCodeEnum;
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import com.example.common.enums.RoleEnum;
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import com.example.entity.Account;
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import com.example.entity.Cart;
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import com.example.exception.CustomException;
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import com.example.mapper.CartMapper;
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import com.example.utils.TokenUtils;
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import com.github.pagehelper.PageHelper;
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import com.github.pagehelper.PageInfo;
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import org.springframework.stereotype.Service;
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import javax.annotation.Resource;
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import java.util.List;
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/**
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* 购物车业务处理
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**/
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@Service
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public class CartService {
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@Resource
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private CartMapper cartMapper;
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/**
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* 新增
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*/
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public void add(Cart cart) {
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// 判断该用户对该商品有没有加入过购物车，如果加入过，那么只要更新一下该条记录的num（+1）
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Cart dbCart = cartMapper.selectByUserIdAndGoodsId(cart.getUserId(), cart.getGoodsId());
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if (ObjectUtil.isNotEmpty(dbCart)) {
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dbCart.setNum(dbCart.getNum() + 1);
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cartMapper.updateById(dbCart);
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} else {
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cartMapper.insert(cart);
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}
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}
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/**
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* 删除
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*/
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public void deleteById(Integer id) {
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cartMapper.deleteById(id);
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}
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/**
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* 批量删除
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*/
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public void deleteBatch(List<Integer> ids) {
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for (Integer id : ids) {
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cartMapper.deleteById(id);
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}
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}
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/**
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* 修改
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*/
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public void updateById(Cart cart) {
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cartMapper.updateById(cart);
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}
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/**
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* 根据ID查询
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*/
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public Cart selectById(Integer id) {
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return cartMapper.selectById(id);
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}
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/**
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* 查询所有
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*/
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public List<Cart> selectAll(Cart cart) {
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return cartMapper.selectAll(cart);
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}
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/**
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* 分页查询
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*/
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public PageInfo<Cart> selectPage(Cart cart, Integer pageNum, Integer pageSize) {
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Account currentUser = TokenUtils.getCurrentUser();
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if (RoleEnum.USER.name().equals(currentUser.getRole())) {
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cart.setUserId(currentUser.getId());
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}
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PageHelper.startPage(pageNum, pageSize);
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List<Cart> list = cartMapper.selectAll(cart);
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return PageInfo.of(list);
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}
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} |
