JPA EntityManager 获取session

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@Servicepublic class TestDaoImpl implements TestDao {    private static final Logger logger = LoggerFactory.getLogger(TestDaoImpl.class);    protected EntityManager entityManager = null;    @PersistenceContext    public void setEntityManager(EntityManager entityManager) {        this.entityManager = entityManager;    }    @Override    public void save(TestEntity entity) {        entityManager.persist(entity);    }    public void clear(){        try {            HibernateEntityManager hEntityManager = (HibernateEntityManager)entityManager;            Session session = hEntityManager.getSession();            Query query = session.createSQLQuery("delete from test");            query.executeUpdate();        }catch (Exception e){            logger.error(e.getMessage(),e);        }    }}

当然，别忘了，在service层，得加上@Transactional注解（因为hibernate默认，autocommit=false）

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