hiberante二级缓存一（配置）

都说hibernate的二级缓存用处比较大，在一年前的一个项目时就打算使用hibernate的二级缓存，但时常碰到脏读又没时间进行分析和处理，后来决定项目取消了对二级缓存的使用。  前不久公司发钱请了红帽的高级架构师进行培训，再三强调二级缓存的做用。。。今天终于下定决心进行了一些测试。首先进行hibernate的二级缓存配置

第一步：.hibernate.cfg.xml 配置文件

 

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        " http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory name="GoingOA">
        <property name="hibernate.bytecode.use_reflection_optimizer">
            false
        </property>
        <property name="hibernate.connection.driver_class">
            com.mysql.jdbc.Driver
        </property>
        <property name="hibernate.connection.password">root</property>
        <property name="hibernate.connection.url">
            jdbc:mysql://127.0.0.1:3306/goingTest
        </property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.dialect">
            org.hibernate.dialect.MySQLDialect
        </property>
        <property name="hbm2ddl.auto">update</property>
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>

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

  <!-- 设置查询缓存-->
       <property name="hibernate.cache.use_query_cache">true</property>

  <!-- 设置二级缓存-->
       <property name="hibernate.cache.use_second_level_cache">true</property>

       <property name="hibernate.use_sql_comments">true</property>
       <property name="hibernate.query.factory_class">
           org.hibernate.hql.classic.ClassicQueryTranslatorFactory
           </property>

           <mapping resource="com/going/oa/model/Attachment.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

 

第二步：定义Attachment.hbm.xml 在xml开始部分定义二级缓存

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
" http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2009-6-25 14:23:21 by Hibernate Tools 3.2.4.GA -->
<hibernate-mapping package="com.going.oa.model">
    <class name="Attachment" table="OA_ATTACHMENT" >
        <cache usage="read-write"/>
       
        <id name="id" type="string">
            <column name="ATTACHEMENT_ID" length="36" />
            <generator class="uuid" />
        </id>
        <property name="p_w_uploadName" type="string">
            <column name="ATTACHMENT_NAME" length="128" not-null="false" >
                <comment>附件名称</comment>
            </column>
        </property>
        <property name="p_w_uploadPath" type="string">
            <column name="ATTACHMENT_PATH" not-null="false" length="256" >
                <comment>附件全路径</comment>
               </column>
        </property>
        <property name="p_w_uploadSize" type="string">
            <column name="ATTACHMENT_SIZE" default="0" >
                <comment>附件大小</comment>
            </column>
        </property>
        <property name="createTime" type="string">
            <column name="UPLOAD_TIME" length="32">
                  <comment>上传时间</comment>
            </column>
        </property>
        <property name="createId" type="string">
            <column name="CREATE_Id" length="32">
                  <comment>建立人工号</comment>
            </column>
        </property>
         
    </class>
</hibernate-mapping>

 

第三步：定义ehcache.xml文件

<ehcache>

    <diskStore path="c:\\ehcache\"/>

    <defaultCache
        maxElementsInMemory="10000"
        eternal="false"
        timeToIdleSeconds="120"
        timeToLiveSeconds="120"
        overflowToDisk="true"
        />

    <cache name="com.going.oa.model.Attachment"
        maxElementsInMemory="10000"
        eternal="false"
        timeToIdleSeconds="300"
        timeToLiveSeconds="600"
        overflowToDisk="true"
        />
 

</ehcache>