Hibernate 三态

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整理自网络

//事务中,持久态的对象,在内存中修改之后,会悄木声声的修改DBSession session = HibernateSessionFactory.getSession();TAircorp a =(TAircorp)session.get("test.hibernate.persistent.TAircorp", 28L);session.beginTransaction();a.setCAircorpeng(a.getCAircorpeng()+"3");//此处内存中修改,并没有显示的更新DBsession.getTransaction().commit();//事务提交之后,会修改DBHibernateSessionFactory.closeSession();Hibernate: select …Hibernate: update …

缓存机制
1 save update saveOrUpdate marge 在flush之后才会更新DB
2 查询缓存

查询

Public List<ApOperInfo> findByExample(AoOperInfo ap){Criterion customized = Restrictions.sqlRestriction(" valid=1 and service_category_id = 77 and to_char(expire_date,'yyyyMMdd')>to_char(sysdate,'yyyyMMdd') ");//扩展规则可以直接写sql.单表的话,不用写别名,直接写字段就可以.Criteria criteria = getSession().createCriteria(ap.getClass());Example example = Example.create(ap);example.enableLike();criteria.add(example);criteria.add(customized);criteria.setFirstResult(firstResult);criteria.setMaxResults(p.getCountEachPage());criteria.addOrder(Order.asc(p.getOrderBy()));criteria.list();return list;}Public List<ApOperInfo> findByExample(ApOperInfo ap){Criteria criteria = dao.getSession().createCriteria(ApOperInfo.class);if(ap != null){Example example = Example.create(ap);example.enableLike();criteria.add(example);}// 过滤所有和当前业务互斥的业务StringBuffer whereHql = new StringBuffer();whereHql.append("({alias}.entity_id not in  (select se.entity_id from ap_oper_info_exclusion se where se.ex_entity_Id=? )" +" and   {alias}.entity_id not in  (select se.ex_entity_Id from ap_oper_info_exclusion se where se.entity_id=?))");whereHql.append(" and {alias}.entity_id != ? ");criteria.add(Restrictions.sqlRestriction(whereHql.toString(), new Object[]{id, id, id}, new Type[]{Hibernate.LONG,Hibernate.LONG,Hibernate.LONG}));return criteria.list();}//扩展规则甚至可以写SQL子查询.{alias}.就是别名.

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