hibernate使用版本是：hibernate-release-4.2.5.Final
需要的jar包：hibernate-release-4.2.5.Final\lib\required下所有jar包
ehcache jar包：hibernate-release-4.2.5.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