Hibernate开启收集缓存统计信息

该功能依赖二级缓存，所以必须先配置开启了二级缓存功能！

分两种情况

        情况一，项目中有hibernate.cfg.xml配置文件

<!-- 开启二级缓存，使用EhCache缓存 -->    <property name="hibernate.cache.use_second_level_cache">true</property><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><!-- 开启收集缓存统计信息的功能，可以查看实际缓存的内容、命中率等 --><property name="hibernate.generate_statistics">true</property><!-- optionally, force Hibernate to keep the cache entries in a more readable format -->        <property name="hibernate.cache.use_structured_entries">true</property>

       情况二，项目集成了Spring框架，没有hibernate.cfg.xml配置文件

<bean id="sessionFactory"class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">......<property name="hibernateProperties">    <props>           ......           <!-- 开启二级缓存，使用EhCache缓存 -->       <prop key="hibernate.cache.use_second_level_cache">true</prop>       <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop>       <!-- 开启查询缓存 -->       <prop key="hibernate.cache.use_query_cache">true</prop>       <!-- 开启收集缓存统计信息的功能，可以查看实际缓存的内容、命中率等 -->       <prop key="hibernate.generate_statistics">true</prop>        <!--  optionally, force Hibernate to keep the cache entries in a more readable format  -->       <prop key="hibernate.cache.use_structured_entries">true</prop>   ......    </props></property><property name="mappingResources">    <list>       <value>edu/po/Users.hbm.xml</value>       <value>edu/po/TLog.hbm.xml</value>    </list></property></bean>

统计信息使用的demo：

//Cache统计统计信息Statistics statistics= sessionFactory.getStatistics();System.out.println(statistics);System.out.println("放入"+statistics.getSecondLevelCachePutCount());System.out.println("命中"+statistics.getSecondLevelCacheHitCount());System.out.println("错过"+statistics.getSecondLevelCacheMissCount());//详细的Cache统计信息for (int i = 0; i < statistics.getEntityNames().length; i++) {String entityName = statistics.getEntityNames()[i];EntityStatistics entityStatistics = statistics.getEntityStatistics(entityName);StringBuilder cacheOperator = new StringBuilder();cacheOperator.append("CategoryName：" ).append(entityStatistics.getCategoryName())             .append("，DeleteCount：").append(entityStatistics.getDeleteCount())             .append("，FetchCount：").append(entityStatistics.getFetchCount())             .append("，InsertCount：").append(entityStatistics.getInsertCount())             .append("，LoadCount：").append(entityStatistics.getLoadCount())                          .append("，OptimisticFailureCount：").append(entityStatistics.getOptimisticFailureCount())             .append("，UpdateCount：").append(entityStatistics.getUpdateCount());             System.out.println(cacheOperator.toString());}

项目demo:  https://github.com/zengyh/SSHWebProject.git