@Testpublic void testfirstleve1(){Session session = null;try{session = HibernateUtil.getSession();Info data1 = session.get(Info.class, "p003");HibernateUtil.closeSession();session = HibernateUtil.getSession();//删除这一行以及上面一行时，返回的结果为trueInfo data2 = session.get(Info.class, "p003");System.out.println(data1==data2);}catch(Exception e){e.printStackTrace();}finally{HibernateUtil.closeSession();}}

@Testpublic void testfirstleve2(){Session session = null;try{session = HibernateUtil.getSession();
//
//            Iterator<Info> iter= session.createQuery("from Info").iterate();
//            while(iter.hasNext()){
//                System.out.println(iter.next().getName());
//            }
//            Iterator<Info> iter1= session.createQuery("from Info").iterate();
//            while(iter1.hasNext()){
//                System.out.println(iter1.next().getName());
//            }
            List<Info> list1 = session.createQuery("from Info").getResultList();List<Info> list2 = session.createQuery("from Info").getResultList();System.out.println(list1==list2);}catch(Exception e){e.printStackTrace();}finally{HibernateUtil.closeSession();}}

Hibernate: select info0_.Code as Code1_1_, info0_.Nation as Nation2_1_, info0_.Name as Name3_1_, info0_.Sex as Sex4_1_, info0_.Birthday as Birthday5_1_ from mydb.info info0_
Hibernate: select info0_.Code as Code1_1_, info0_.Nation as Nation2_1_, info0_.Name as Name3_1_, info0_.Sex as Sex4_1_, info0_.Birthday as Birthday5_1_ from mydb.info info0_
false

Hibernate: select info0_.Code as col_0_0_ from mydb.info info0_
Hibernate: select info0_.Code as Code1_1_0_, info0_.Nation as Nation2_1_0_, info0_.Name as Name3_1_0_, info0_.Sex as Sex4_1_0_, info0_.Birthday as Birthday5_1_0_ from mydb.info info0_ where info0_.Code=?
周丹
Hibernate: select info0_.Code as Code1_1_0_, info0_.Nation as Nation2_1_0_, info0_.Name as Name3_1_0_, info0_.Sex as Sex4_1_0_, info0_.Birthday as Birthday5_1_0_ from mydb.info info0_ where info0_.Code=?
唐墨
Hibernate: select info0_.Code as Code1_1_0_, info0_.Nation as Nation2_1_0_, info0_.Name as Name3_1_0_, info0_.Sex as Sex4_1_0_, info0_.Birthday as Birthday5_1_0_ from mydb.info info0_ where info0_.Code=?
胡
Hibernate: select info0_.Code as Code1_1_0_, info0_.Nation as Nation2_1_0_, info0_.Name as Name3_1_0_, info0_.Sex as Sex4_1_0_, info0_.Birthday as Birthday5_1_0_ from mydb.info info0_ where info0_.Code=?
吴倩
Hibernate: select info0_.Code as col_0_0_ from mydb.info info0_
周丹
唐墨
胡
吴倩

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

<!--~ Hibernate, Relational Persistence for Idiomatic Java~~ License: GNU Lesser General Public License (LGPL), version 2.1 or later.~ See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.-->
<ehcache><!-- Sets the path to the directory where cache .data files are created.If the path is a Java System Property it is replaced byits value in the running VM.The following properties are translated:user.home - User's home directoryuser.dir - User's current working directoryjava.io.tmpdir - Default temp file path --><diskStore path="java.io.tmpdir"/><!--Default Cache configuration. These will applied to caches programmatically created throughthe CacheManager.The following attributes are required for defaultCache:maxInMemory       - Sets the maximum number of objects that will be created in memoryeternal           - Sets whether elements are eternal. If eternal,  timeouts are ignored and the elementis never expired.timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only usedif the element is not eternal. Idle time is now - last accessed timetimeToLiveSeconds - Sets the time to live for an element before it expires. Is only usedif the element is not eternal. TTL is now - creation timeoverflowToDisk    - Sets whether elements can overflow to disk when the in-memory cachehas reached the maxInMemory limit.--><defaultCachemaxElementsInMemory="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 theCacheManager startsThe 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 memoryeternal           - Sets whether elements are eternal. If eternal,  timeouts are ignored and the elementis never expired.timeToIdleSeconds - Sets the time to idle for an element before it expires. Is only usedif the element is not eternal. Idle time is now - last accessed timetimeToLiveSeconds - Sets the time to live for an element before it expires. Is only usedif the element is not eternal. TTL is now - creation timeoverflowToDisk    - Sets whether elements can overflow to disk when the in-memory cachehas reached the maxInMemory limit.--><!-- Sample cache named sampleCache1This cache contains a maximum in memory of 10000 elements, and will expirean element if it is idle for more than 5 minutes and lives for more than10 minutes.If there are more than 10000 elements it will overflow to thedisk cache, which in this configuration will go to wherever java.io.tmp isdefined 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 sampleCache2This 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>

@Testpublic void testsecondleve(){Session session = null;try{session = HibernateUtil.getSession();List<Info> list1 = session.createQuery("from Info").setCacheable(true).getResultList();List<Info> list2 = session.createQuery("from Info").setCacheable(true).getResultList();System.out.println(list1==list2);}catch(Exception e){e.printStackTrace();}finally{HibernateUtil.closeSession();}}

Hibernate: select info0_.Code as Code1_1_, info0_.Nation as Nation2_1_, info0_.Name as Name3_1_, info0_.Sex as Sex4_1_, info0_.Birthday as Birthday5_1_ from mydb.info info0_
false