法一（本地sql查詢,注意表名啥的都用數據庫中的名稱，適用于特定數據庫的查詢）

public interface UserRepository extends JpaRepository<User, Long> {@Query(value = "SELECT * FROM USERS WHERE LASTNAME = ?1",countQuery = "SELECT count(*) FROM USERS WHERE LASTNAME = ?1",nativeQuery = true)Page<User> findByLastname(String lastname, Pageable pageable); }

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法二（jpa已經實現的分頁接口，適用于簡單的分頁查詢）

public interface PagingAndSortingRepository<T, ID extends Serializable>extends CrudRepository<T, ID> {Iterable<T> findAll(Sort sort);Page<T> findAll(Pageable pageable); }Accessing the second page of User by a page size of 20 you could simply do something like this:PagingAndSortingRepository<User, Long> repository = // … get access to a bean Page<User> users = repository.findAll(new PageRequest(1, 20)); User findFirstByOrderByLastnameAsc();User findTopByOrderByAgeDesc();Page<User> queryFirst10ByLastname(String lastname, Pageable pageable);Slice<User> findTop3ByLastname(String lastname, Pageable pageable);List<User> findFirst10ByLastname(String lastname, Sort sort);List<User> findTop10ByLastname(String lastname, Pageable pageable);

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//serviceSort sort = new Sort(Sort.Direction.DESC,"createTime"); //創建時間降序排序Pageable pageable = new PageRequest(pageNumber,pageSize,sort); this.depositRecordRepository.findAllByUserIdIn(userIds,pageable);//repository Page<DepositRecord> findAllByUserIdIn(List<Long> userIds,Pageable pageable);

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法三（Query注解,hql語局，適用于查詢指定條件的數據）

@Query(value = "select b.roomUid from RoomBoard b where b.userId=:userId and b.lastBoard=true order by b.createTime desc")Page<String> findRoomUidsByUserIdPageable(@Param("userId") long userId, Pageable pageable); Pageable pageable = new PageRequest(pageNumber,pageSize); Page<String> page = this.roomBoardRepository.findRoomUidsByUserIdPageable(userId,pageable); List<String> roomUids = page.getContent();

可以自定義整個實體(Page<User>)，也可以查詢某幾個字段（Page<Object[]>），和原生sql幾乎一樣靈活。

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法四（擴充findAll，適用于動態sql查詢）

public interface UserRepository extends JpaRepository<User, Long> {Page<User> findAll(Specification<User> spec, Pageable pageable); }? @Service public class UserService {@Autowiredprivate UserRepository userRepository;public Page<User> getUsersPage(PageParam pageParam, String nickName) {//規格定義Specification<User> specification = new Specification<User>() {/*** 構造斷言* @param root 實體對象引用* @param query 規則查詢對象* @param cb 規則構建對象* @return 斷言*/@Overridepublic Predicate toPredicate(Root<User> root, CriteriaQuery<?> query, CriteriaBuilder cb) {List<Predicate> predicates = new ArrayList<>(); //所有的斷言if(StringUtils.isNotBlank(nickName)){ //添加斷言Predicate likeNickName = cb.like(root.get("nickName").as(String.class),nickName "%");predicates.add(likeNickName);}return cb.and(predicates.toArray(new Predicate[0]));}};//分頁信息Pageable pageable = new PageRequest(pageParam.getPage()-1,pageParam.getLimit()); //頁碼：前端從1開始，jpa從0開始，做個轉換//查詢return this.userRepository.findAll(specification,pageable);}}

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法五（使用entityManager，適用于動態sql查詢）

@Service @Transactional
public class IncomeService{/*** 實體管理對象*/@PersistenceContextEntityManager entityManager;public Page<IncomeDaily> findIncomeDailysByPage(PageParam pageParam, String cpId, String appId, Date start, Date end, String sp) {StringBuilder countSelectSql = new StringBuilder();countSelectSql.append("select count(*) from IncomeDaily po where 1=1 ");StringBuilder selectSql = new StringBuilder();selectSql.append("from IncomeDaily po where 1=1 ");Map<String,Object> params = new HashMap<>();StringBuilder whereSql = new StringBuilder();if(StringUtils.isNotBlank(cpId)){whereSql.append(" and cpId=:cpId ");params.put("cpId",cpId);}if(StringUtils.isNotBlank(appId)){whereSql.append(" and appId=:appId ");params.put("appId",appId);}if(StringUtils.isNotBlank(sp)){whereSql.append(" and sp=:sp ");params.put("sp",sp);}if (start == null){start = DateUtil.getStartOfDate(new Date());}whereSql.append(" and po.bizDate >= :startTime");params.put("startTime", start);if (end != null){whereSql.append(" and po.bizDate <= :endTime");params.put("endTime", end);}String countSql = new StringBuilder().append(countSelectSql).append(whereSql).toString();Query countQuery = this.entityManager.createQuery(countSql,Long.class);this.setParameters(countQuery,params);Long count = (Long) countQuery.getSingleResult();String querySql = new StringBuilder().append(selectSql).append(whereSql).toString();Query query = this.entityManager.createQuery(querySql,IncomeDaily.class);this.setParameters(query,params);if(pageParam != null){ //分頁 query.setFirstResult(pageParam.getStart());query.setMaxResults(pageParam.getLength());}List<IncomeDaily> incomeDailyList = query.getResultList();if(pageParam != null) { //分頁Pageable pageable = new PageRequest(pageParam.getPage(), pageParam.getLength());Page<IncomeDaily> incomeDailyPage = new PageImpl<IncomeDaily>(incomeDailyList, pageable, count);return incomeDailyPage;}else{ //不分頁return new PageImpl<IncomeDaily>(incomeDailyList);}}/*** 給hql參數設置值* @param query 查詢* @param params 參數*/private void setParameters(Query query,Map<String,Object> params){for(Map.Entry<String,Object> entry:params.entrySet()){query.setParameter(entry.getKey(),entry.getValue());}}
}

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