hibernate二级缓存 。高并发

sessesionFactory配置

<property name="hibernateProperties">  
            <props>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.format_sql">true</prop>   
                <!-- 是否开启二级缓存 -->
                <prop key="hibernate.cache.use_second_level_cache">true</prop>  
                <!-- 是否启用查询缓存 -->  
                <prop key="hibernate.cache.use_query_cache">true</prop>  
                <!-- 配置二级缓存提供商 -->
                <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>  
                 <!-- 配置 ehcache.xml的路径-->
                <prop key="hibernate.net.sf.ehcache.configurationResourceName">classpath:ehcache.xml</prop>  
            </props>  
        </property>

ehcache.xml

<?xml version="1.0" encoding="UTF-8"?>    
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    
    xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"    
    updateCheck="false">  
    <!-- DISKStury路径必须配置,不然报错 -->
    <diskStore path="D:sourceehcache"/>  
    <!-- 数据过期策略  如果开启查询缓存就必须开启 -->  
    <defaultCache  
        maxElementsInMemory="10000"
        eternal="false"  
        timeToIdleSeconds="600"  
        timeToLiveSeconds="600"  
        overflowToDisk="true"  
        />
    <!-- 具体到某个类的数据过期策略 -->  
    <cache name="com.gxuwz.labasswork.model.entity.SysUser"  
        maxElementsInMemory="10000"  
        eternal="false"  
        timeToIdleSeconds="300"  
        timeToLiveSeconds="600"  
        overflowToDisk="true"  
        />  

</ehcache>  

在hbm.xml文件中加入<cache usage="read-write" region="com.gxuwz.labasswork.model.entity.SysUser" />

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!--
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="com.gxuwz.labasswork.model.entity.SysUser" table="sys_user" catalog="lab_ass_work">
    <cache usage="read-write" region="com.gxuwz.labasswork.model.entity.SysUser" />
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="native" />
        </id>
        <property name="userName" type="java.lang.String">
            <column name="user_name" length="30" not-null="true" unique="true" />
        </property>
        <property name="userPwd" type="java.lang.String">
            <column name="user_pwd" length="30" />
        </property>
        <property name="userType" type="java.lang.String">
            <column name="user_type" length="10" />
        </property>
        <property name="stuNo" type="java.lang.String">
            <column name="stu_no" length="30" unique="true" />
        </property>
        <property name="stuName" type="java.lang.String">
            <column name="stu_name" length="30" />
        </property>
        <property name="major" type="java.lang.String">
            <column name="major" length="30" />
        </property>
        <property name="institute" type="java.lang.String">
            <column name="institute" length="30" />
        </property>
        <property name="classes" type="java.lang.String">
            <column name="classes" length="30" />
        </property>
        <property name="grade" type="java.lang.String">
            <column name="grade" length="4" />
        </property>
        <property name="phone" type="java.lang.String">
            <column name="phone" length="11" />
        </property>
    </class>
</hibernate-mapping>

二级缓存当使用load()、get();查询时程序只发送一条sql语句

查询缓存

在使用query.list()之前，必须要开启query.setCacheable(true);