Spring Data JPA实现查询结果返回map或自定义的实体类

 query.setHint(QueryHints.RESULT_TYPE, ResultType.Map);

 query.unwrap(SQLQuery.class).setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);

 QueryImpl impl = q.unwrap(QueryImpl.class); impl.setResultClass(Map.class);

@Component
public class EntityManagerUtil<T> {
   @PersistenceContext
   private EntityManager entityManager;
  
   //1.返回map
   public List<Map<String, Object>> getListMap(String sql){
      Query nativeQuery=entityManager.createNativeQuery(sql);
      nativeQuery.unwrap(SQLQuery.class).setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);
      List resultList=nativeQuery.getResultList();
      return resultList;
   }
  
   //2.返回自定义实体类
   public List<T> nativeQueryResult(String sql, Class clazz) {
     sql = Normalizer.normalize(sql, Normalizer.Form.NFKC);
     sql = sql.replaceAll(".*([';]+|(--)+).*", "");
     Query query = entityManager.createNativeQuery(sql);
     List<T> queryList = query.unwrap(SQLQuery.class).setResultTransformer(Transformers.aliasToBean(clazz)).list();
     return queryList;
   }
}

 //1.自动注入
 @Autowired
 private EntityManagerUtil entityManagerUtil;
     //1.返回map
     String sql="sql语句";
     List<Map> list=entityManagerUtil.getListMap(sql);
     //2.1 返回自定义实体类（方法一）
     List<实体类> list = entityManagerUtil.nativeQueryResult(sql, 实体类.class);
    //2.2  返回自定义实体类（方法二 hql）

   @PersistenceContext
    private EntityManager em;
    /**
     * 通过时间范围查询职位统计结果
     * @param startMonth
     * @param endMonth
     * @return
     */
    @Override
    public String queryPositionByMonthOfYear(String startMonth, String endMonth) {
 
        int sumNewPosn =0;
        int sumCurrPosn =0;
        int dailyAverage =0;
        Map<String, Object> resultMap=null;
        JSONObject jo =null;
        JSONObject jod =null;
        String endMonthTmp=null;
        List<Map<String,Object>> lis = null;
        try {
            int tmp = Integer.valueOf(endMonth.split("-")[1])+1;
            endMonthTmp=Integer.valueOf(endMonth.split("-")[0])+"-"+tmp;
            String sql = "select left(statistic_time,7) time ,sum(new_position) newPosition ,sum(curr_position) nowRecruitposition  from t_cal_positions " +
                            "where statistic_time > '"+startMonth+"' and statistic_time <'"+endMonthTmp+"' group by left(statistic_time,7)";
            Query query = em.createNativeQuery(sql);
            query.unwrap(org.hibernate.SQLQuery.class)
                    .setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);
                List<Map<String, Object>> rows  = query.getResultList();
                if(null!=rows &&  rows.size()>0){
                        resultMap  = new HashMap<String, Object>();
                        lis= new ArrayList<Map<String,Object>>();
                        for (Map<String, Object> map : rows) {
                            if(map.get("time").equals(endMonth)){
//                              int daynum = DateUtil.getDayOfMonth(Integer.valueOf(endMonth.split("-")[0]),Integer.valueOf(endMonth.split("-")[1]));
                                dailyAverage=Integer.valueOf(String.valueOf(map.get("nowRecruitposition")))/DateUtil.getDateOfMonth();
                            }
                              lis.add(map);
                        }
                        jo = new JSONObject();
                        jod = new JSONObject();
                        jod.put("dailyAverage",dailyAverage);
                        jod.put("list",lis);
                        jo.put("code", EnumHttpStatusType.success.getCode());
                        jo.put("msg",EnumHttpStatusType.success.getStatus());
                        jo.put("data",jod);
                        return jo.toString();
                    }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return jo.toString();
    }