Hibernate的二级缓存的用法

阳光穿透心脏的1/2处 2022-09-24 03:29 97阅读 0赞

1、Hibernate的二级缓存的用法

导入ehcache-core-2.4.3.jar的文件

2、在Hibernate的hibernate.cfg.xml中的配置文件

2.1 开启Hibernate二级缓存的配置

<property name="hibernate.cache.use_second_level_cache">true</property>
    		
    		
    		<property name="hibernate.cache.provider_class">net.sf.ehcache.hibernate.EhCacheProvider</property>
    		
    		
    		
    		
    		
    		<property name="hibernate.cache.use_query_cache">true</property>
    		
    		
    		
    		<property name="hibernate.cache.provider_configuration_file_resource_path">ehcache.xml</property>

2.2  指定具体的缓存类

<class-cache usage="read-write" class="com.hibernate.entity.Student" />
    		<class-cache usage="read-write" class="com.hibernate.entity.ClassRoom" />
    		
    		<collection-cache usage="read-write"
    			collection="com.hibernate.entity.ClassRoom.stus" />

3、ehcache.xml文件

4、测试代码

4.1 测试缓存一个类

@Test
    	public void test02() {
    		SessionFactory sessionFactory = HibernateUtils.FACTORY;
    		Session session1 = sessionFactory.openSession();
    		Student stu1 = (Student) session1.load(Student.class, 1);
    		System.out.println(stu1);
    		session1.close();
    		Session session2 = sessionFactory.openSession();
    		Student stu2 = (Student) session2.load(Student.class, 1);
    		System.out.println(stu2);
    		session2.close();
    	}

4.2  测试缓存,list()

@Test
    	public void test03() {
    		SessionFactory sessionFactory = HibernateUtils.FACTORY;
    		// session1
    		Session session1 = sessionFactory.openSession();
    		List<Student> lists1 = session1.createQuery("from Student ")
    				.setCacheable(true).list();
    		for (Student stu : lists1) {
    			System.out.println(stu);
    		}
    		// session2
    		Session session2 = sessionFactory.openSession();
    		List<Student> lists2 = session2.createQuery("from Student ")
    				.setCacheable(true).list();
    		for (Student stu : lists2) {
    			System.out.println(stu);
    		}
    		session1.close();
    
    	}

4.3 测试缓存集合（主要用于一的一方去查询Set的时候）

@Test
    	public void test04() {
    		SessionFactory sessionFactory = HibernateUtils.FACTORY;
    		// session1
    		Session session1 = sessionFactory.openSession();
    		List<ClassRoom> lists1 = session1.createQuery("from ClassRoom ")
    				.setCacheable(true).list();
    		for (ClassRoom cla : lists1) {
    			System.out.println(cla.getStus());
    		}
    		// session2
    		Session session2 = sessionFactory.openSession();
    		List<ClassRoom> lists2 = session2.createQuery("from ClassRoom ")
    				.setCacheable(true).list();
    		for (ClassRoom cla : lists2) {
    			System.out.println(cla.getStus());
    		}
    		session1.close();
    
    	}

5、测试代码

[Hibernate集合ehcache实现二级缓存的测试代码][Hibernate_ehcache]

[Hibernate_ehcache]: http://pan.baidu.com/s/1mhKeiGK