法一(本地sql查询,注意表名啥的都用数据库中的名称,适用于特定数据库的查询)
public interface UserRepository extends JpaRepository {
@Query(value = "SELECT * FROM USERS WHERE LASTNAME = ?1",
countQuery = "SELECT count(*) FROM USERS WHERE LASTNAME = ?1",
nativeQuery = true)
Page findByLastname(String lastname, Pageable pageable);
}法二(jpa已经实现的分页接口,适用于简单的分页查询)
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 beanPage<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);
//service
Sort sort = new Sort(Sort.Direction.DESC,"createTime"); //创建时间降序排序
Pageable pageable = new PageRequest(pageNumber,pageSize,sort); this.depositRecordRepository.findAllByUserIdIn(userIds,pageable);//repositoryPage<DepositRecord> findAllByUserIdIn(List<Long> userIds,Pageable pageable);法三(Query注解,hql语局,适用于查询指定条件的数据)
@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();
可以自定义整个实体(Page<User>),也可以查询某几个字段(Page<Object[]>),和原生sql几乎一样灵活。法四(扩充findAll,适用于动态sql查询)
public interface UserRepository extends JpaRepository<User, Long> {
Page<User> findAll(Specification<User> spec, Pageable pageable);
}
@Servicepublic class UserService {
@Autowired private UserRepository userRepository; public Page<User> getUsersPage(PageParam pageParam, String nickName) { //规格定义
Specification<User> specification = new Specification<User>() { /**
* 构造断言
* @param root 实体对象引用
* @param query 规则查询对象
* @param cb 规则构建对象
* @return 断言 */
@Override public Predicate toPredicate(Root<User> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
List<Predicate> predicates = new ArrayList<>(); //所有的断言
if(StringUtils.isNotBlank(nickName)){ //添加断言
Predicate likeNickName = cb.like(root.get("nickName").as(String.class),nickName+"%");
predicates.add(likeNickName);
} return cb.and(predicates.toArray(new Predicate[0]));
}
}; //分页信息
Pageable pageable = new PageRequest(pageParam.getPage()-1,pageParam.getLimit()); //页码:前端从1开始,jpa从0开始,做个转换 //查询
return this.userRepository.findAll(specification,pageable);
}
}
法五(使用entityManager,适用于动态sql查询)
IncomeService Page<IncomeDaily>= "select count(*) from IncomeDaily po where 1=1 "= "from IncomeDaily po where 1=1 "<String,Object> params = HashMap<>= " and cpId=:cpId ""cpId"" and appId=:appId ""appId"" and sp=:sp ""sp" (start == = DateUtil.getStartOfDate(" and po.bizDate >= :startTime""startTime" (end != " and po.bizDate <= :endTime""endTime"= = .entityManager.createQuery(countSql,Long.== = .entityManager.createQuery(querySql,IncomeDaily.(pageParam != ){ <IncomeDaily> incomeDailyList =(pageParam != ) {
Pageable pageable = <IncomeDaily> incomeDailyPage = PageImpl<IncomeDaily>{
PageImpl<IncomeDaily>
setParameters(Query query,Map<String,Object>(Map.Entry<String,Object>springboot 2.x 分页
单字段排序
modelAttrDao.findAll(Sort.by(Sort.Direction.DESC,"isWrite"));
多字段排序
Sort.Order order1 = new Sort.Order(Sort.Direction.ASC, "isWrite");
Sort.Order order2 = new Sort.Order(Sort.Direction.DESC, "id");
List<Sort.Order> list = new ArrayList<>();
list.add(order1);
list.add(order2);
modelAttrDao.findAll(Sort.by(list));
扩展分页加排序
Sort.Order order= new Sort.Order(Sort.Direction.DESC,"id");
Sort sort =Sort.by(order);
PageRequest request = PageRequest.of(page,limit,sort);
Sort.Order order1 = new Sort.Order(Sort.Direction.ASC, "isWrite");
Sort.Order order2 = new Sort.Order(Sort.Direction.DESC, "id");
List<Sort.Order> list = new ArrayList<>();
list.add(order1);
list.add(order2);
Sort sort =Sort.by(list);
PageRequest request = PageRequest.of(page,limit,sort);
//分页加排序实例
public Page<UserInfo> getUserPage(UserInfo userInfo, CmsPage cmsPage){
//getBean 为非spring管理环境中获取bean
UserDao userDao =SpringUtils.getBean(UserDao.class);
try{
Specification query=new Specification<UserInfo>(){
@Override
public Predicate toPredicate(Root<UserInfo> root, CriteriaQuery<?> criteriaQuery, CriteriaBuilder criteriaBuilder) {
Predicate predicate = criteriaBuilder.conjunction();
//id
if(userInfo.getId() != null){
predicate=criteriaBuilder.and(predicate,criteriaBuilder.equal(root.get("id"),userInfo.getId()));
}
//用户名 多条件
if(StringUtils.isNotEmpty(userInfo.getUserName())){
predicate=criteriaBuilder.and(predicate,criteriaBuilder.like(root.get("userName"),"%"+userInfo.getUserName()+"%"));
predicate=criteriaBuilder.or(predicate,criteriaBuilder.equal(root.get("phone"),"%"+userInfo.getUserName()+"%"));
predicate=criteriaBuilder.or(predicate,criteriaBuilder.equal(root.get("email"),"%"+userInfo.getUserName()+"%"));
}
if(userInfo.getGroupId() !=null){
predicate=criteriaBuilder.and(predicate,criteriaBuilder.equal(root.get("groupId"),userInfo.getGroupId()));
}
return predicate;
}
};
Sort.Order order1 = new Sort.Order(Sort.Direction.ASC, "isWrite");
Sort.Order order2 = new Sort.Order(Sort.Direction.DESC, "id");
List<Sort.Order> list = new ArrayList<>();
list.add(order1);
list.add(order2);
Sort sort =Sort.by(list);
//0起始页 100 每页显示多少 第三参数排序
PageRequest request = PageRequest.of(0,100,sort);
Page<UserInfo> user =userDao.findAll(query,request);
return user;
}catch (Exception e){
e.printStackTrace();
}
return null;
}
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