springboot项目之查询商品某规格的最小值

由于项目的需要，查询某产品下某规格的最小价格，本次做了优化

旧版本的实现

MPJLambdaWrapper<GoodWeighDto> wrappers=new MPJLambdaWrapper<GoodWeighDto>()
                        .selectAll(GoodWeighDto.class)
                        .eq(GoodWeighDto::getGoodId,e.getGoodId());
                List<GoodWeighDto> list2 = goodWeighDtoMapper.selectJoinList(GoodWeighDto.class, wrappers);
                //最小值对应的获取
                if(CollUtil.isNotEmpty(list2)){
                    GoodWeighDto minUinPriceObject = list2.stream()
                            .min(Comparator.comparing(GoodWeighDto::getUniPrice))
                            .orElse(null); // 如果没有找到最小值，返回null
                    goodVo.setGoodPrice(minUinPriceObject.getUniPrice());
                }

优化后的版本

MPJLambdaWrapper<GoodWeighDto> wrappers = new MPJLambdaWrapper<GoodWeighDto>()
                        .selectAll(GoodWeighDto.class)
                        .orderByAsc(GoodWeighDto::getUniPrice)
                        .eq(GoodWeighDto::getGoodId,e.getGoodId())// 按照UniPrice升序排序
                        .last("LIMIT 1"); // 只取一条记录

                GoodWeighDto cheapestGoodWeighDto = goodWeighDtoMapper.selectOne(wrappers);