注意:实体内需注明表关系@OneToMany,@ManyToOne,@ManyToMany,@OneToOne
public Page<DeviceEntity> findPage(LocalDateTime begin, LocalDateTime end, int page, int pageSize) {
Page<DeviceEntity> deviceEntityPage = deviceRepository.findAll(new Specification<DeviceEntity>() {
@Override
public Predicate toPredicate(Root<DeviceEntity> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
List<Predicate> predicateList = Lists.newArrayList();
Join<DeviceEntity,RegionDeviceEntity> drJoin = root.join("regions",JoinType.LEFT);
Join<RegionDeviceEntity,RegionEntity> rrJoin = drJoin.join("region",JoinType.LEFT);
Join<RegionEntity,ParkEntity> rpJoin = rrJoin.join("park",JoinType.LEFT);
if (begin != null) {
predicateList.add(criteriaBuilder.greaterThanOrEqualTo(root.get("operatedAt"),begin));
}
if (end != null) {
predicateList.add(criteriaBuilder.lessThanOrEqualTo(root.get("operatedAt"),end));
}
return criteriaBuilder.and(predicateList.toArray(new Predicate[predicateList.size()]));
}
},PageRequest.of(page,pageSize, new Sort(Sort.Direction.DESC, "id")));
return deviceEntityPage;
}
看的时候需要对jpa分页有一定了解的,如有需要可直接留言。