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

1. <?xml version='1.0' encoding='utf-8'?>
2. <!DOCTYPE hibernate-configuration PUBLIC
3. "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
4. "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
5. <hibernate-configuration>
6. <session-factory>
7. <!-- Database connection settings -->
8. <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
9. <property name="connection.url">jdbc:mysql://127.0.0.1:3306/hibernate4</property>
10. <property name="connection.username">root</property>
11. <property name="connection.password">root</property>
12. <!-- JDBC connection pool (use the built-in) -->
13. <property name="connection.pool_size">1</property>
14. <!-- SQL dialect -->
15. <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
16. <!-- Enable Hibernate's automatic session context management -->
17. <property name="current_session_context_class">thread</property>
18. <!-- Disable the second-level cache -->
19. <!--<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
20. -->
21. <!-- 配置二级缓存 -->
22. <property name="hibernate.cache.use_second_level_cache">true</property>
23. <property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
24. <!-- hibernate3的二级缓存配置 -->
25. <!-- <property name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property> -->
26. <!-- 开启查询缓存 -->
27. <property name="hibernate.cache.use_query_cache">true</property>
28. <!-- Echo all executed SQL to stdout -->
29. <property name="show_sql">true</property>
30. <!-- Drop and re-create the database schema on startup -->
31. <property name="hbm2ddl.auto">update</property>
32. <mapping class="com.test.pojo.User" />
33. </session-factory>
34. </hibernate-configuration>

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

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

而hibernate3的配置是

1. <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

1. org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.spi.CacheImplementor]
2. at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:186)
3. at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:150)
4. at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
5. at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:264)
6. at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1790)
7. at com.test.pojo.UserTest.beforeClass(UserTest.java:28)
8. at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
9. at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
10. at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
11. at java.lang.reflect.Method.invoke(Method.java:597)
12. at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
13. at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
14. at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
15. at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
16. at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
17. at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
18. at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
19. at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
20. at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
21. at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
22. at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
23. 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).
24. at org.hibernate.cache.internal.NoCachingRegionFactory.buildTimestampsRegion(NoCachingRegionFactory.java:87)
25. at org.hibernate.cache.spi.UpdateTimestampsCache.<init>(UpdateTimestampsCache.java:62)
26. at org.hibernate.internal.CacheImpl.<init>(CacheImpl.java:72)
27. at org.hibernate.engine.spi.CacheInitiator.initiateService(CacheInitiator.java:40)
28. at org.hibernate.engine.spi.CacheInitiator.initiateService(CacheInitiator.java:35)
29. at org.hibernate.service.internal.SessionFactoryServiceRegistryImpl.initiateService(SessionFactoryServiceRegistryImpl.java:91)
30. at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:176)
31. ... 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

1. <?xml version="1.0" encoding="UTF-8"?>
2. <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3. xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
4. updateCheck="false">
5. <!--
6. name:cache唯一标识
7. eternal：缓存是否永久有效
8. maxElementsInMemory：内存中最大缓存对象数
9. overflowToDisk(true,false)：缓存对象达到最大数后，将缓存写到硬盘中
10. diskPersistent：硬盘持久化
11. timeToIdleSeconds：缓存清除时间
12. timeToLiveSeconds：缓存存活时间
13. memoryStoreEvictionPolicy：缓存清空策略
14. 1.FIFO：first in first out 先讲先出
15. 2.LFU： Less Frequently Used 一直以来最少被使用的
16. 3.LRU：Least Recently Used  最近最少使用的
17. -->
18. <defaultCache maxElementsInMemory="1000" eternal="false"
19. timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" />
20. <cache name="userCache" eternal="false" maxElementsInMemory="1000"
21. overflowToDisk="false" diskPersistent="false" timeToIdleSeconds="3600"
22. timeToLiveSeconds="3600" memoryStoreEvictionPolicy="LFU" />
23. </ehcache>

User实体类

1. package com.test.pojo;
2. import javax.persistence.Entity;
3. import javax.persistence.GeneratedValue;
4. import javax.persistence.GenerationType;
5. import javax.persistence.Id;
6. import org.hibernate.annotations.Cache;
7. import org.hibernate.annotations.CacheConcurrencyStrategy;
8. @Entity
9. @Cache(usage=CacheConcurrencyStrategy.READ_WRITE)
10. public class User {
11. @Id
12. @GeneratedValue(strategy=GenerationType.IDENTITY)
13. private int id;
14. private String name;
15. private int age;
16. public int getId() {
17. return id;
18. }
19. public void setId(int id) {
20. this.id = id;
21. }
22. public String getName() {
23. return name;
24. }
25. public void setName(String name) {
26. this.name = name;
27. }
28. public int getAge() {
29. return age;
30. }
31. public void setAge(int age) {
32. this.age = age;
33. }
34. }

UserTest测试类：

1. package com.test.pojo;
2. import org.hibernate.HibernateException;
3. import org.hibernate.Session;
4. import org.hibernate.SessionFactory;
5. import org.hibernate.cfg.Configuration;
6. import org.hibernate.service.ServiceRegistry;
7. import org.hibernate.service.ServiceRegistryBuilder;
8. import org.junit.BeforeClass;
9. import org.junit.Test;
10. public class UserTest {
11. private static SessionFactory sessionFactory = null;
12. @BeforeClass
13. public static void beforeClass() {
14. Configuration configuration = new Configuration();
15. try {
16. configuration.configure();
17. } catch (HibernateException e) {
18. // TODO Auto-generated catch block
19. e.printStackTrace();
20. }
21. ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
22. sessionFactory = configuration.buildSessionFactory(serviceRegistry);
23. }
24. @Test
25. public void testEhcache() {
26. Session session = sessionFactory.openSession();
27. session.beginTransaction();
28. User u1 = (User) session.load(User.class, 3);
29. System.out.println(u1.getName());
30. session.getTransaction().commit();
31. session.close();
32. Session session2 = sessionFactory.openSession();
33. session2.beginTransaction();
34. User u2 = (User) session2.load(User.class, 3);
35. System.out.println(u2.getName());
36. session2.getTransaction().commit();
37. session2.close();
38. }
39. }

结果：

1. 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=?
2. zhangsan
3. zhangsan

list二级缓存测试

1. package com.test.pojo;
2. import java.util.List;
3. import org.hibernate.HibernateException;
4. import org.hibernate.Session;
5. import org.hibernate.SessionFactory;
6. import org.hibernate.cfg.Configuration;
7. import org.hibernate.service.ServiceRegistry;
8. import org.hibernate.service.ServiceRegistryBuilder;
9. import org.junit.BeforeClass;
10. import org.junit.Test;
11. public class UserTest {
12. private static SessionFactory sessionFactory = null;
13. @BeforeClass
14. public static void beforeClass() {
15. Configuration configuration = new Configuration();
16. try {
17. configuration.configure();
18. } catch (HibernateException e) {
19. // TODO Auto-generated catch block
20. e.printStackTrace();
21. }
22. ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
23. sessionFactory = configuration.buildSessionFactory(serviceRegistry);
24. }
25. @SuppressWarnings("unchecked")
26. @Test
27. public void testListEhcache() {
28. Session session = sessionFactory.openSession();
29. session.beginTransaction();
30. List<User> users1 = (List<User>)session.createQuery("from User").setCacheable(true).list();
31. for(User user : users1) {
32. System.out.println(user.getName());
33. }
34. session.getTransaction().commit();
35. session.close();
36. Session session2 = sessionFactory.openSession();
37. session2.beginTransaction();
38. List<User> users2 = (List<User>)session2.createQuery("from User").setCacheable(true).list();
39. for(User user : users2) {
40. System.out.println(user.getName());
41. }
42. session2.getTransaction().commit();
43. session2.close();
44. }
45. }

输出结果：

1. Hibernate: select user0_.id as id1_0_, user0_.age as age2_0_, user0_.name as name3_0_ from User user0_
2. zhangsan
3. zhangsan
4. lisi
5. wangwu
6. zhangsan
7. zhangsan
8. lisi
9. wangwu