List<HttpAvgDustNoiseAreaVo> list = em.createNativeQuery("native sql")
.unwrap(SQLQuery.class)
.setResultTransformer(Transformers.aliasToBean(HttpAvgDustNoiseAreaVo.class))
.list();
return list;
aliasToBean中加入类名class,这样可以映射自定义的泛型集合