<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><!-- 注意顺序：property->mapping->class-cahche -->
<hibernate-configuration><session-factory><!-- 开启缓存 --><!-- 开启二级缓存 --><property name="hibernate.cache.use_second_level_cache">true</property><!-- 指定二级缓存产品的提供商 --><property name="cache.region.factory_class">org.hibernate.cache.EhCacheRegionFactory</property><!-- 开启查询缓存 --><property name="hibernate.cache.use_query_cache">true</property><!-- 映射的文件 --><mapping class="com.myoracle.entity.User" /><mapping class="com.myoracle.entity.Teacher" /><!-- 指定User类使用二级缓存 --><class-cache usage="read-only" class="com.myoracle.entity.User"></class-cache></session-factory>
</hibernate-configuration>

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-2.5.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-2.5.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-2.5.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"><bean id="myDataSource"class="org.springframework.jdbc.datasource.DriverManagerDataSource"><property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"></property><property name="url" value="jdbc:oracle:thin:@localhost:1521:wyoracle" /><property name="username" value="scott" /><property name="password" value="123456" /></bean><bean id="sessionFactory"class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"><property name="dataSource" ref="myDataSource"></property><property name="hibernateProperties"><props><prop key="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</prop><prop key="hibernate.show_sql">true</prop><prop key="hibernate.hbm2ddl.auto">update</prop><prop key="hibernate.format_sql">true</prop></props></property><property name="configLocations"><list><value>classpath:hibernate.cfg.xml</value></list></property></bean><bean id="transactionManager"class="org.springframework.orm.hibernate4.HibernateTransactionManager"><property name="sessionFactory" ref="sessionFactory"></property></bean><tx:annotation-driven transaction-manager="transactionManager" />
</beans>

    @RequestMapping("/mycache")public String myCache() {List<String> strings = this.userServiceImpl.search("select u.username from User u where id<4 order by id asc");for (String str : strings) {System.out.println("username:" + str);}System.out.println("===================================");List<String> strings2 = this.userServiceImpl.search("select u.username from User u where id<4 order by id asc");for (String str : strings2) {System.out.println("username:" + str);}return "/mycache";}

    @SuppressWarnings("unchecked")public List<String> search(String hql) {List<String> rtnStrs = new ArrayList<String>();try {Session session = this.sessionFactory.openSession();session.beginTransaction();Query query = session.createQuery(hql);//query.setCacheable(true);// 手动开启查询缓存rtnStrs = (List<String>) query.list();session.getTransaction().commit();} catch (Exception e) {System.out.println("DAO层根据HQL语句查询失败");}return rtnStrs;}

    /*** 查询缓存开启，二级缓存关闭*******查询实体对象* * 运行结果：如果关闭查询缓存和二级缓存，在两次查询时都发出sql语句，此时为两条查询语句* * 运行结果：如果开启查询缓存，关闭二级缓存，第二次会发出根据ID查询实体的n条查询语句* * 运行结论：第一次执行list时，会把查询对象的ID缓存到查询缓存中，第二次执行list时（两次的查询SQL语句必须相同），会遍历查询缓存中的ID到* （一级、二级）缓存里找实体对象， 此时没有，则发出查询语句到数据库中查询* * @return*/@RequestMapping("/mycache3")public String mycache3() {List<User> users1 = this.userServiceImpl.search();for (User u : users1) {System.out.println("users1:username:" + u.getUsername());}System.out.println("===============");List<User> users2 = this.userServiceImpl.search();for (User u : users2) {System.out.println("users2:usersname:" + u.getUsername());}return "/mycache";}