Hibernate二级缓存

 1 @org.junit.Test 2 ????public void testHibernateSecondLevelCache(){ 3 ????????Employee employee=(Employee) session.get(Employee.class, 7499); 4 ????????System.out.println(employee.getName()); 5 ?????????6 ????????transaction.commit(); 7 ????????session.close(); 8 ????????session = sessionFactory.openSession(); 9 ????????transaction = session.beginTransaction();10 ????????11 ????????Employee employee2=(Employee) session.get(Employee.class, 7499);12 ????????System.out.println(employee2.getName());13 ????}

<ehcache> ???<!-- Sets the path to the directory where cache .data files are created. ????????If the path is a Java System Property it is replaced by ????????its value in the running VM. ????????The following properties are translated: ????????user.home - User‘s home directory ????????user.dir - User‘s current working directory ????????java.io.tmpdir - Default temp file path --> ???<diskStore path="java.io.tmpdir"/> ???<!--Default Cache configuration. These will applied to caches programmatically created through ???????the CacheManager. ???????The following attributes are required for defaultCache: ???????maxInMemory ??????- Sets the maximum number of objects that will be created in memory ???????eternal ??????????- Sets whether elements are eternal. If eternal, ?timeouts are ignored and the element ???????????????????????????is never expired. ???????timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only used ???????????????????????????if the element is not eternal. Idle time is now - last accessed time ???????timeToLiveSeconds - Sets the time to live for an element before it expires. Is only used ???????????????????????????if the element is not eternal. TTL is now - creation time ???????overflowToDisk ???- Sets whether elements can overflow to disk when the in-memory cache ???????????????????????????has reached the maxInMemory limit. ???????--> ???<defaultCache ???????maxElementsInMemory="10000" ???????eternal="false" ???????timeToIdleSeconds="120" ???????timeToLiveSeconds="120" ???????overflowToDisk="true" ???????/> ???<!--Predefined caches. ?Add your cache configuration settings here. ???????If you do not have a configuration for your cache a WARNING will be issued when the ???????CacheManager starts ???????The following attributes are required for defaultCache: ???????name ?????????????- Sets the name of the cache. This is used to identify the cache. It must be unique. ???????maxInMemory ??????- Sets the maximum number of objects that will be created in memory ???????eternal ??????????- Sets whether elements are eternal. If eternal, ?timeouts are ignored and the element ???????????????????????????is never expired. ???????timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only used ???????????????????????????if the element is not eternal. Idle time is now - last accessed time ???????timeToLiveSeconds - Sets the time to live for an element before it expires. Is only used ???????????????????????????if the element is not eternal. TTL is now - creation time ???????overflowToDisk ???- Sets whether elements can overflow to disk when the in-memory cache ???????????????????????????has reached the maxInMemory limit. ???????--> ???<!-- Sample cache named sampleCache1 ???????This cache contains a maximum in memory of 10000 elements, and will expire ???????an element if it is idle for more than 5 minutes and lives for more than ???????10 minutes. ???????If there are more than 10000 elements it will overflow to the ???????disk cache, which in this configuration will go to wherever java.io.tmp is ???????defined on your system. On a standard Linux system this will be /tmp" ???????--> ???<cache name="sampleCache1" ???????maxElementsInMemory="10000" ???????eternal="false" ???????timeToIdleSeconds="300" ???????timeToLiveSeconds="600" ???????overflowToDisk="true" ???????/> ???<!-- Sample cache named sampleCache2 ???????This cache contains 1000 elements. Elements will always be held in memory. ???????They are not expired. --> ???<cache name="sampleCache2" ???????maxElementsInMemory="1000" ???????eternal="true" ???????timeToIdleSeconds="0" ???????timeToLiveSeconds="0" ???????overflowToDisk="false" ???????/> --> ???<!-- Place configuration for your caches following --></ehcache>

<!-- 配置启用hibernate的二级缓存 --> ???????<property name="cache.use_second_level_cache">true</property> ???????<!-- 配置hibernate二级缓存使用的产品 --> ???????<property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property> ???????<!-- 配置对哪些类使用 hibernate 的二级缓存 ?。在mapping的后面 --> ???????<class-cache usage="read-write" class="com.hq.entities.Employee"/>

<cache usage="read-write"/>

　　　　　<class-cache usage="read-write" class="com.hq.entities.Employee"/> ???????<class-cache usage="read-write" class="com.hq.entities.Department"/> ???????<collection-cache usage="read-write" collection="com.hq.entities.Department.emps"/> 

 <cache usage="read-write"/>

<set name="emps" table="GG_EMP" inverse="true" lazy="true"> ???????????<cache usage="read-write"/> ???????????<key> ???????????????<column name="DEPT_ID" /> ???????????</key> ???????????<one-to-many class="com.hq.entities.Employee" /> ???????</set>