购物车其他功能代码
1. 删除购物车中一个商品
1.1 产品原型
1.2 接口设计
1.3 数据模型
shopping_cart表：
1.4 代码开发
1.4.1 ShoppingCartController
/**
* 删除购物车中一个商品
* @param shoppingCartDTO
* @return
*/
@PostMapping("/sub")
@ApiOperation("删除购物车中一个商品")
public Result sub(@RequestBody ShoppingCartDTO shoppingCartDTO){
log.info("删除购物车中一个商品，商品：{}", shoppingCartDTO);
shoppingCartService.subShoppingCart(shoppingCartDTO);
return Result.success();
}
1.4.2 ShoppingCartService
/**
* 删除购物车中一个商品
* @param shoppingCartDTO
*/
void subShoppingCart(ShoppingCartDTO shoppingCartDTO);
1.4.3 ShoppingCartServiceImpl
/**
* 删除购物车中一个商品
* @param shoppingCartDTO
*/
public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
ShoppingCart shoppingCart = new ShoppingCart();
BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
//设置查询条件，查询当前登录用户的购物车数据
shoppingCart.setUserId(BaseContext.getCurrentId());
List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
if(list != null && list.size() > 0){
shoppingCart = list.get(0);
Integer number = shoppingCart.getNumber();
if(number == 1){
//当前商品在购物车中的份数为1，直接删除当前记录
shoppingCartMapper.deleteById(shoppingCart.getId());
}else {
//当前商品在购物车中的份数不为1，修改份数即可
shoppingCart.setNumber(shoppingCart.getNumber() - 1);
shoppingCartMapper.updateNumberById(shoppingCart);
}
}
}
1.4.4 ShoppingCartMapper
/**
* 根据id删除购物车数据
* @param id
*/
@Delete("delete from shopping_cart where id = #{id}")
void deleteById(Long id);