JpaSpecificationExecutor

条件分页查询

@Transactional(readOnly = true)
    @SuppressWarnings("unchecked")
    public Page<GroupDetails> findAllByPage(String uid, String title, LocalDateTime startTime, LocalDateTime endTime, Pageable pageable) {
        return repository.findAll((root, query, criteriaBuilder) -> {
            List<Predicate> predicateList = new ArrayList<>();
            predicateList.add(criteriaBuilder.equal(root.get("userPid"), uid));
            if (startTime != null || endTime != null) {
                predicateList.add(criteriaBuilder.between(root.get("createTime"), startTime, endTime));
            }
            if (title != null && !title.isEmpty()) {
                predicateList.add(criteriaBuilder.like(root.get("groupName"), "%" + title + "%"));
            }
            if (predicateList.size() > 0) {
                Predicate[] predicates = new Predicate[predicateList.size()];
                for (int i = 0; i < predicates.length; i++) {
                    predicates[i] = predicateList.get(i);
                }
                query.where(predicates);
            }
            query.orderBy(criteriaBuilder.desc(root.get("createTime")));
            return query.getRestriction();
        }, pageable);
    }