Java JPA通过hql语句查询数据

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import javax.persistence.PersistenceContext; import javax.persistence.Query;   public class StudentServiceImpl {           @PersistenceContext     private EntityManager entityManager;       public void getByHql() {         String hql = "select * from Student";         Query query = entityManager.createQuery(hql);         List<Student> list = query.getResultList();     }       /**       *查Map结果集     */     public void getMapByHql() {         String hql = "select new Map(s.name as name, s.age as age) from Student s";         Query query = entityManager.createQuery(hql);         List<Map<String, Object>> list = query.getResultList();     }    }