hibernate cache2

在hibernate.cfg.xml 中添加缓存  t1oo 一对多 t2oo (t2ooSet)

     < property  name ="cache.provider_class" > org.hibernate.cache.EhCacheProvider </ property >
     < property  name ="hibernate.cache.use_query_cache" > true </ property >

     < mapping  resource ="hbn/bean/T1oo.hbm.xml"   />
     < mapping  resource ="hbn/bean/T2oo.hbm.xml"   />

     < class-cache  class ="hbn.bean.T1oo"  usage ="read-only"   />
     < collection-cache  collection ="hbn.bean.T1oo.t2ooSet"  usage ="read-only"   />
     < class-cache  class ="hbn.bean.T2oo"  usage ="read-only"   />

在src根目录下 ehcache.xml

<? xml version="1.0" encoding="UTF-8" ?>
< ehcache >
     < diskStore  path ="java.io.tmpdir" />
     < defaultCache
         maxElementsInMemory ="10000" //最大缓存数目
        eternal ="false" ＜!-- 缓存是否持久 --＞
        timeToIdleSeconds ="120" ＜!-- 当缓存闲置n秒后销毁 --＞
        timeToLiveSeconds ="120" ＜!-- 当缓存存活n秒后销毁--＞
        overflowToDisk ="true" ＜!-- 是否保存到磁盘，当系统当机时--＞
        diskPersistent ="false"
        diskExpiryThreadIntervalSeconds ="120" />

     < cache
      name ="hbn.bean.T1oo"
     maxElementsInMemory ="450"
     eternal ="false"
     timeToLiveSeconds ="600"
     overflowToDisk ="true" />

</ ehcache >

测试：

     public   void  testCa() throws  Exception{
        System.out.println( getT1ooAll() );
        
        Thread.sleep( 2 * 1000 );
        
        System.out.println( getT1ooAll () );
    }

控制台输出

Hibernate:  select  t1oo0_.id  as  id, t1oo0_.name  as  name0_  from  t1oo t1oo0_ limit ?

Hibernate:  select  t2ooset0_.aid  as  aid1_, t2ooset0_.id  as  id1_, t2ooset0_.id  as  id0_, t2ooset0_.version  as  version1_0_, t2ooset0_. avg   as  avg1_0_, t2ooset0_.aid  as  aid1_0_  from  t2oo t2ooset0_  where  t2ooset0_.aid = ?
Hibernate:  select  t2ooset0_.aid  as  aid1_, t2ooset0_.id  as  id1_, t2ooset0_.id  as  id0_, t2ooset0_.version  as  version1_0_, t2ooset0_. avg   as  avg1_0_, t2ooset0_.aid  as  aid1_0_  from  t2oo t2ooset0_  where  t2ooset0_.aid = ?
24  :  23  :  25  :  2

//在这缓存成功 没向数据库提交 sql语句
24  :  23  :  25  :  2