hibernate——缓存

红太狼 2022-04-15 03:08 211阅读 0赞

>     /**
>      * Created by Administrator on 2018/11/16 0016.
>      * 一级缓存 Session
>      * 二级缓存 SessionFactory
>      * 查询缓存 createQuery
>      */

## 一级缓存  ##

>     get，load方法自动从一级缓存中查找，如果存在缓存对象，直接使用

@Test
        public void firstLevel(){
            Session session = HibernateUtil.getCurrentSession();
    
            Province p = session.get(Province.class,1);
    
            Province p1 = session.get(Province.class,1);
    
            HibernateUtil.close(session);
        }

## 二级缓存 ##

hibernate.cfg.xml配置

<property name="hibernate.cache.use_second_level_cache">true</property>
            
            <property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>

@Test
        public void sencondLevel(){
            Session session = HibernateUtil.getCurrentSession();
    
            Province p = session.get(Province.class,1);
    
            HibernateUtil.close(session);
    
            Session session1 = HibernateUtil.getCurrentSession();
    
            Province p1 = session1.get(Province.class,1);
    
            session1.beginTransaction();
            p1.setName("aaaaa");
            session1.saveOrUpdate(p1);
            session1.getTransaction().commit();
    
            HibernateUtil.close(session1);
    
        }

## 查询缓存 ##

hibernate.cfg.xml配置

<property name="cache.use_query_cache">true</property>

@Test
        public void queryCache(){
            Session session = HibernateUtil.getCurrentSession();
    
            List<Province> provinceList = session.createQuery("from Province ").setCacheable(true).list();
    
            HibernateUtil.close(session);
    
            Session session1 = HibernateUtil.getCurrentSession();
    
            List<Province> provinceList1 = session1.createQuery("from Province ").setCacheable(true).list();
    
            HibernateUtil.close(session1);
    
        }