Specification排序orderby

廢話很少說直接貼代碼

Specification<Course> sf = new Specification<Course>() {
            @Override
            public Predicate toPredicate(Root<Course> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
                List<Predicate> predicateList = Lists.newArrayList();

                //isDelete
                Predicate isDeletePredicate = criteriaBuilder.equal(root.get("isDelete"), Constant.NOT_DELETE);
                predicateList.add(isDeletePredicate);

                //isShelves
                Predicate isShelvesPredicate = criteriaBuilder.equal(root.get("isShelves"),Constant.COURSE_SHELVES_YES);
                predicateList.add(isShelvesPredicate);

                //categoryId
                if(categoryId!=null){
                    Predicate predicate = criteriaBuilder.equal(root.get("category").get("id"), categoryId);
                    predicateList.add(predicate);
                }

                //isRecommend
                if(isRecommend!=null){
                    Predicate predicate = criteriaBuilder.equal(root.get("isRecommend"), isRecommend);
                    predicateList.add(predicate);
                }

                /** * order By */
                Order weightOrder = criteriaBuilder.desc(root.get("weight"));
                Order createDateOrder = criteriaBuilder.desc(root.get("createDate"));

                return  criteriaQuery.orderBy(weightOrder, createDateOrder).where(predicateList.toArray(new Predicate[predicateList.size()])).getRestriction();

            }
        };

我的微信公衆，常常更新一些實用的乾貨: