千峰商城-springboot项目搭建-76-修改购物车接口实现

 1.接口：

ShoppingCartMapper ：

@Repository
public interface ShoppingCartMapper extends GeneralDAO<ShoppingCart> {

    public List<ShoppingCartVO> selectShopcartByUserId(int userId);
    
    public int updateCartnumByCartId(@Param("cartId") int cartId,
                                     @Param("cartNum") int cartNum);//数据库要进行两个及以上的操作，需要通过@Param指定
    
}

 

 

2.映射配置

    <update id="updateCartnumByCartId">
        update shopping_cart set cart_num=#{cartNum} where cart_id=#{cartId}
    </update>

 

 

3.业务层

ShoppingCartService：

    public ResultVO updateCartNum(int cartId,int cartNum);

 

 ShoppingCartServiceImpl：

    @Override
    public ResultVO updateCartNum(int cartId, int cartNum) {
        int i = shoppingCartMapper.updateCartnumByCartId(cartId, cartNum);
        if (i>0){
            return new ResultVO(ResStatus.OK,"update success",null);
        }else {
            return new ResultVO(ResStatus.NO,"update fail",null);
        }
        
    }

 

 

 4.控制层实现

@PutMapping("/update/{cid}/{cnum}")
public ResultVO updateNum(@PathVariable("cid") Integer cartId,
                          @PathVariable("cnum") Integer cartNum,
                          @RequestHeader("token") String token){
    ResultVO resultVO = shoppingCartService.updateCartNum(cartId, cartNum);
    return resultVO;

}