hibernate4 二级缓存demo实例

转载：http://blog.csdn.net/chaoowang/article/details/21236501

hibernate使用版本是：hibernate-release-4.3.4.Final

需要的jar包：hibernate-release-4.3.4Final\lib\required下所有jar包

ehcache  jar包：hibernate-release-4.3.4.Final\lib\optional\ehcache下所有包

junit：junit-4.10.jar和mysql-connector-java-5.1.15-bin.jar

注：hibernate 4.2.5版本ehcache缓存不依赖commons-logging-1.1.1.jar,需要的是slf4j-api-1.6.1.jar

项目结构如下
 

 

hibernate.cfg.xml

 <?xml version='1.0' encoding='utf-8'?>
 <!DOCTYPE hibernate-configuration PUBLIC
         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 <hibernate-configuration>
     <session-factory>
         <!-- Database connection settings -->
         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
         <property name="connection.url">jdbc:mysql://127.0.0.1:3306/hibernate4</property>
         <property name="connection.username">root</property>
         <property name="connection.password">root</property>
         <!-- JDBC connection pool (use the built-in) -->
         <property name="connection.pool_size">1</property>
         <!-- SQL dialect -->
         <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
         <!-- Enable Hibernate's automatic session context management -->
         <property name="current_session_context_class">thread</property>
         <!-- Disable the second-level cache -->
         <!--<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
         -->
         <!-- 配置二级缓存 -->
         <property name="hibernate.cache.use_second_level_cache">true</property>
         <property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
         <!-- hibernate3的二级缓存配置 -->
         <!-- <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property> -->
         <!-- 开启查询缓存 -->
         <property name="hibernate.cache.use_query_cache">true</property>

         <!-- Echo all executed SQL to stdout -->
         <property name="show_sql">true</property>
         <!-- Drop and re-create the database schema on startup -->
         <property name="hbm2ddl.auto">update</property>
         <mapping class="com.test.pojo.User" />
     </session-factory>
 </hibernate-configuration>

 

注意：hibernate4和hibernate3配置不一样，hibernate4是

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

 

而hibernate3的配置是

 <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property>

 此处有一个疑问是：hibernate4的官方文档中，已经把class改了，但是属性名称没有改，还是 hibernate.cache.provider_class，不是上面的 hibernate.cache.region.factory_class，但是写成hibernate.cache.provider_class会 报下面错误

 

 org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.spi.CacheImplementor]
     at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:186)
     at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:150)
     at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
     at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:264)
     at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1790)
     at com.test.pojo.UserTest.beforeClass(UserTest.java:28)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
     at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
     at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
     at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
     at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
     at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
 Caused by: org.hibernate.cache.NoCacheRegionFactoryAvailableException: Second-level cache is used in the application, but property hibernate.cache.region.factory_class is not given, please either disable second level cache or set correct region factory class name to property hibernate.cache.region.factory_class (and make sure the second level cache provider, hibernate-infinispan, for example, is available in the classpath).
     at org.hibernate.cache.internal.NoCachingRegionFactory.buildTimestampsRegion(NoCachingRegionFactory.java:87)
     at org.hibernate.cache.spi.UpdateTimestampsCache.<init>(UpdateTimestampsCache.java:62)
     at org.hibernate.internal.CacheImpl.<init>(CacheImpl.java:72)
     at org.hibernate.engine.spi.CacheInitiator.initiateService(CacheInitiator.java:40)
     at org.hibernate.engine.spi.CacheInitiator.initiateService(CacheInitiator.java:35)
     at org.hibernate.service.internal.SessionFactoryServiceRegistryImpl.initiateService(SessionFactoryServiceRegistryImpl.java:91)
     at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:176)
     ... 20 more

 说是hibernate.cache.region.factory_class属性没有配置，估计官方文档里没有把属性改过来。。。

 

ehcache.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
     updateCheck="false">
     <!--
         name:cache唯一标识
         eternal：缓存是否永久有效
         maxElementsInMemory：内存中最大缓存对象数
         overflowToDisk(true,false)：缓存对象达到最大数后，将缓存写到硬盘中
         diskPersistent：硬盘持久化
         timeToIdleSeconds：缓存清除时间
         timeToLiveSeconds：缓存存活时间
         memoryStoreEvictionPolicy：缓存清空策略
         1.FIFO：first in first out 先讲先出
         2.LFU： Less Frequently Used 一直以来最少被使用的
         3.LRU：Least Recently Used  最近最少使用的
     -->
     <defaultCache maxElementsInMemory="1000" eternal="false"
         timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" />
     <cache name="userCache" eternal="false" maxElementsInMemory="1000"
         overflowToDisk="false" diskPersistent="false" timeToIdleSeconds="3600"
         timeToLiveSeconds="3600" memoryStoreEvictionPolicy="LFU" />
 </ehcache>

 

User实体类

 package com.test.pojo;

 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
 import javax.persistence.GenerationType;
 import javax.persistence.Id;

 import org.hibernate.annotations.Cache;
 import org.hibernate.annotations.CacheConcurrencyStrategy;

 @Entity
 @Cache(usage=CacheConcurrencyStrategy.READ_WRITE)
 public class User {
     @Id
     @GeneratedValue(strategy=GenerationType.IDENTITY)
     private int id;
     private String name;
     private int age;
     public int getId() {
         return id;
     }
     public void setId(int id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public int getAge() {
         return age;
     }
     public void setAge(int age) {
         this.age = age;
     }

 }

 

UserTest测试类：

 package com.test.pojo;
 import org.hibernate.HibernateException;
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.cfg.Configuration;
 import org.hibernate.service.ServiceRegistry;
 import org.hibernate.service.ServiceRegistryBuilder;
 import org.junit.BeforeClass;
 import org.junit.Test;

 public class UserTest {

     private static SessionFactory sessionFactory = null;
     @BeforeClass
     public static void beforeClass() {
         Configuration configuration = new Configuration();


         try {
             configuration.configure();
         } catch (HibernateException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }


         ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
         sessionFactory = configuration.buildSessionFactory(serviceRegistry);
     }
     @Test
     public void testEhcache() {
         Session session = sessionFactory.openSession();
         session.beginTransaction();
         User u1 = (User) session.load(User.class, 3);
         System.out.println(u1.getName());
         session.getTransaction().commit();
         session.close();
         Session session2 = sessionFactory.openSession();

         session2.beginTransaction();
         User u2 = (User) session2.load(User.class, 3);
         System.out.println(u2.getName());
         session2.getTransaction().commit();
         session2.close();
     }
 }

 结果：

 Hibernate: select user0_.id as id1_0_0_, user0_.age as age2_0_0_, user0_.name as name3_0_0_ from User user0_ where user0_.id=?
 zhangsan
 zhangsan

 

list二级缓存测试

 package com.test.pojo;
 import java.util.List;

 import org.hibernate.HibernateException;
 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.cfg.Configuration;
 import org.hibernate.service.ServiceRegistry;
 import org.hibernate.service.ServiceRegistryBuilder;
 import org.junit.BeforeClass;
 import org.junit.Test;

 public class UserTest {

     private static SessionFactory sessionFactory = null;
     @BeforeClass
     public static void beforeClass() {
         Configuration configuration = new Configuration();


         try {
             configuration.configure();
         } catch (HibernateException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }


         ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
         sessionFactory = configuration.buildSessionFactory(serviceRegistry);
     }
     @SuppressWarnings("unchecked")
     @Test
     public void testListEhcache() {
         Session session = sessionFactory.openSession();
         session.beginTransaction();
         List<User> users1 = (List<User>)session.createQuery("from User").setCacheable(true).list();
         for(User user : users1) {
             System.out.println(user.getName());
         }
         session.getTransaction().commit();
         session.close();

         Session session2 = sessionFactory.openSession();
         session2.beginTransaction();
         List<User> users2 = (List<User>)session2.createQuery("from User").setCacheable(true).list();
         for(User user : users2) {
             System.out.println(user.getName());
         }
         session2.getTransaction().commit();
         session2.close();
     }
 }

 输出结果：

 Hibernate: select user0_.id as id1_0_, user0_.age as age2_0_, user0_.name as name3_0_ from User user0_
 zhangsan
 zhangsan
 lisi
 wangwu
 zhangsan
 zhangsan
 lisi
 wangwu