SpringDataJpa增删改查

资料来源网址：http://www.cnblogs.com/hawell/p/SpringDataJpa.html

Repository（几个常用的例子）

 @Repository
 public interface StormManageRepository extends JpaRepository<StormManage, Long> {

 //根据id删除StormManage
 @Query(value = "delete from bdsp_storm_manage where id=?1 ", nativeQuery = true)
 @Modifying
 public void deleteStormManageById(int id);

 //根据id获取数据源
 @Query(value = "select * from bdsp_storm_manage where id=?1 ", nativeQuery = true)
 public StormManage findStormManageById(int id);

 //修改Storm的state的状态
 @Query(value = "update bdsp_storm_manage sm set sm.state=?1 where sm.id=?2 ", nativeQuery = true)
 @Modifying
 public void updateStormManageState(int state,int id);

 //根据id获取数据源
 @Query(value = "select * from bdsp_storm_manage where enter_topic=?1 ", nativeQuery = true)
 public List<StormManage> findStormManageByEnterTopic(int enterTopic);

 }

service层几个例子

 @Service
 @Transactional
 public class StormManageService {
 @Resource
 private StormManageRepository stormManageRepository;

 /**
 * 存储StormManage管理(直接调用save方法,如果想修改的话,需要传一个id)
 * */
 public StormManage saveStormManage(StormManage stormManage){
 StormManage sm=stormManageRepository.save(stormManage);
 return sm;
 }

 /**
 * 分页查询
 * */
 public Page<StormManage> queryStormBy(Map<String, Object> searchParams, Pageable pageable) {
 Page<StormManage> queryStormBy = null;
 try {
 Map<String, SearchFilter> filters = SearchFilter.parse(searchParams);
 Specification<StormManage> spec = DynamicSpecifications.bySearchFilter(filters.values());
 queryStormBy = stormManageRepository.findAll(spec, pageable);
 } catch (Exception e) {
 e.printStackTrace();
 }
 return queryStormBy;
 }

 /**
 * 根据id删除StormManage
 * */
 public void deleteStormManageById(int id){
 stormManageRepository.deleteStormManageById(id);
 }　　

 }

Controller层（主要是分页查询）

 @RequestMapping("/toStormJsp")
 public String toStormJsp(HttpServletRequest request, Model model,@ModelAttribute("id") String id,HttpSession session) {
 try{

 Map<String, Object> searchParams = new HashMap<String, Object>();
 StreamUser user=(StreamUser)session.getAttribute("user");
 String superuser=user.getSuperuser();//superuser 0：normal 1：super
 if(superuser.equals("1")){
 searchParams.put("EQ_userName", "");
 }else{
 searchParams.put("EQ_userName",user.getUserName());
 }

 Page<StormManage> stormManages = stormManageService.queryStormBy(searchParams, null);
 List<StormManage> findStormManage = new ArrayList<StormManage>();
 for (StormManage dm : stormManages) {
 findStormManage.add(dm);
 }

 int page = 0;
 Sort sort = new Sort(Sort.Direction.DESC, "operateTime");//按时间排序
 Pageable pager =new PageRequest(page, pageSize,sort);
 Page<StormManage> page2 = stormManageService.queryStormBy(searchParams, pager);
 List<StormManageDto> pageList = new ArrayList<StormManageDto>();

 for (StormManage dm : page2 ) {
   pageList .add(dm);
 }
 int totalRecord=pageList.size();
 int maxResult=10;
 int totalPage = totalRecord % maxResult == 0 ? totalRecord / maxResult : totalRecord / maxResult + 1 ;
 model.addAttribute("totalPage", totalPage);
 model.addAttribute("totalList",totalRecord);
 model.addAttribute("ipage",page+1);

 }catch (Exception e){
 e.printStackTrace();
 logger.info(e.getMessage());
 }
 return "storm/storm";
 }