Posted on 2007-12-07 15:36
G_G 閱讀(960)
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hibernate
在hibernate.cfg.xml 中添加緩存? t1oo 一對多 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根目錄下 ehcache.xml
<?xml?version="1.0"?encoding="UTF-8"?>
<ehcache>
????<diskStore?path="java.io.tmpdir"/>
????<defaultCache
????????maxElementsInMemory="10000" //最大緩存數(shù)目
????????eternal="false"＜!-- 緩存是否持久 --＞
????????timeToIdleSeconds="120" ＜!-- 當(dāng)緩存閑置n秒后銷毀 --＞
????????timeToLiveSeconds="120"＜!-- 當(dāng)緩存存活n秒后銷毀--＞
????????overflowToDisk="true"＜!-- 是否保存到磁盤，當(dāng)系統(tǒng)當(dāng)機(jī)時--＞
????????diskPersistent="false"
????????diskExpiryThreadIntervalSeconds="120"/>
????<cache
?????name="hbn.bean.T1oo"
?????maxElementsInMemory="450"
?????eternal="false"
?????timeToLiveSeconds="600"
?????overflowToDisk="true"/>
</ehcache>
測試：
????public?void?testCa()throws?Exception{
????????System.out.println( getT1ooAll()?);
????????
????????Thread.sleep(2*1000);
????????
????????System.out.println( getT1ooAll()?);
????}
控制臺輸出
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
//在這緩存成功 沒向數(shù)據(jù)庫提交 sql語句
24?:?23?:?25?:?2