Hibernate+ehcache缓存测试

最新推荐文章于 2025-11-26 15:59:01 发布

原创最新推荐文章于 2025-11-26 15:59:01 发布 · 159 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#java #数据库

Hibernate 专栏收录该内容

3 篇文章

订阅专栏

本文通过具体示例展示了Hibernate框架中的一级缓存与二级缓存的使用方法，并详细介绍了配置文件hibernate.cfg.xml、映射文件testtable.hbm.xml及ehcache.xml的设置细节。

理论部分参见：http://tpglzu2015.iteye.com/blog/2206134

测试结果，与以上理论基本一致。

测试相关代码

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
     
<hibernate-configuration>
    <session-factory>
     
    <!-- Database connection settings -->
    <property name="connection.driver_class">org.postgresql.Driver</property>
    <property name="connection.url">jdbc:postgresql://127.0.0.1:5432/XXXXXX</property>
    <property name="connection.username">XXXXXX</property>
    <property name="connection.password">XXXXXX</property>
         
    <!-- JDBC connection pool (use the built-in) -->
    <property name="connection.pool_size">30</property>
         
    <!-- SQL dialect -->
    <property name="dialect">org.hibernate.dialect.PostgresPlusDialect</property>
         
    <!-- Echo all executed SQL to stdout -->
    <property name="show_sql">true</property>
    <property name="format_sql">true</property>  
    
    <property name="hibernate.jdbc.batch_size">100</property>
    <property name="hibernate.jdbc.fetch_size">50</property>
    <property name="hibernate.cache.use_second_level_cache">true</property>
    <property name="hibernate.cache.use_query_cache">true</property>
    <property name="net.sf.ehcache.configurationResourceName">ehcache.xml</property>
    
        
    <!-- Enable Hibernate's automatic session context management -->
    <!--<property name="current_session_context_class">thread</property>-->
         
    <!-- Drop and re-create the database schema on startup -->
    <!-- <property name="hbm2ddl.auto">create</property> -->
         
    <!-- Disable the second-level cache -->
    <!-- <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> -->
    <property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
    
             
    <mapping resource="hibernateDemo/hbms/testtable.hbm.xml"/>
         
    </session-factory>
</hibernate-configuration>

testtable.hbm.xml

<?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">
 
<hibernate-mapping package="hibernateDemo.beans">
    <class name="TestTable">
        <cache usage="read-write"/>
        <id name="id"></id>
        <property name="name"></property>
    </class>
</hibernate-mapping>

注意事项，如果cache节点未配置的话，是不会对该对象进行二级缓存的。

所以，需要配置缓存策略的对象需添加cache节点，不需要配置缓存策略的对象需删除cache节点

ehcache.xml

<?xml version="1.0" encoding="UTF-8"?>

<ehcache>
       <diskStore path="java.io.tmpdir" />
      
      <cache name="hibernateDemo.beans.TestTable"
            maxElementsInMemory="10000"
            eternal="false"
            timeToIdleSeconds="120"
            timeToLiveSeconds="120"
            overflowToDisk="true"
            maxElementsOnDisk="10000000"
            diskPersistent="false"
            diskExpiryThreadIntervalSeconds="120"
            memoryStoreEvictionPolicy="LRU"
     />
     
    <defaultCache
        maxElementsInMemory="0"
        eternal="false"
        timeToIdleSeconds="0"
        timeToLiveSeconds="0"
        overflowToDisk="false"
    />
</ehcache>

TestMain.java

package hibernateDemo;

import hibernateDemo.beans.TestTable;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class TestMain {

    private Configuration cfg;
    private SessionFactory sf;
    Session session;

    public void setup() {
        cfg = new Configuration();
        sf = cfg.configure().buildSessionFactory();
        session = sf.openSession();
    }

    public void close() {
        session.close();
        sf.close();
    }

    public void insert(Long id, String name) {
        TestTable s = new TestTable();
        s.setId(id);
        s.setName(name);
        session.beginTransaction();
        session.save(s);
        session.getTransaction().commit();
    }

    public void delete(Long id) {
        TestTable s = new TestTable();
        s.setId(id);
        session.beginTransaction();
        session.delete(s);
        session.getTransaction().commit();
    }

    public void update(Long id, String name) {
        TestTable s = new TestTable();
        s.setId(id);
        s.setName(name);
        session.beginTransaction();
        session.update(s);
        session.getTransaction().commit();
    }

    public void search(Long id) {
        session.beginTransaction();
        String queryStr = "from TestTable ";
        if (id != null) {
            queryStr += " where id = " + id;
        }
        Query query = session.createQuery(queryStr);
        List<TestTable> testTables = query.list();
        for (TestTable testTable : testTables) {
            System.out.println(testTable.getId() + "\t" + testTable.getName());
        }

        session.getTransaction().commit();
    }

    public void getTest_SessionCache() {
        System.err.println("getTest_SessionCache ... do");

        setup();
        // get method test
        TestTable testTable = (TestTable) session.get(TestTable.class, 2L);
        System.out.println("id = " + testTable.getId());
        System.out.println("name = " + testTable.getName());
        System.out.println("--------------------------");
        testTable = (TestTable) session.get(TestTable.class, 2L);
        System.out.println("id = " + testTable.getId());
        System.out.println("name = " + testTable.getName());

        close();
        System.err.println("getTest_SessionCache ... end");
    }

    public void getTest_FactoryCache() throws InterruptedException {
        setup();
        System.err.println("getTest_FactoryCache ... do");

        // get method test
        TestTable testTable = (TestTable) session.get(TestTable.class, 2L);
        System.out.println("id = " + testTable.getId());
        System.out.println("name = " + testTable.getName());
        session.close();
        System.out.println("--------------------------");
        Thread.sleep(10000);
        session = sf.openSession();
        testTable = (TestTable) session.get(TestTable.class, 2L);
        System.out.println("id = " + testTable.getId());
        System.out.println("name = " + testTable.getName());

        System.err.println("getTest_FactoryCache ... end");
        close();
    }

    public void loadTest_SessionCache() {
        setup();
        System.err.println("loadTest_SessionCache ... do");

        // get method test
        TestTable testTable = (TestTable) session.load(TestTable.class, 2L);
        System.out.println("id = " + testTable.getId());
        System.out.println("name = " + testTable.getName());
        System.out.println("--------------------------");
        testTable = (TestTable) session.load(TestTable.class, 2L);
        System.out.println("id = " + testTable.getId());
        System.out.println("name = " + testTable.getName());

        System.err.println("loadTest_SessionCache ... end");
        close();
    }

    public static void main(String[] args) throws InterruptedException {
        TestMain testMain = new TestMain();
        // testMain.insert(3L, "s3");
        // testMain.search(null);
        // testMain.update(id, name);

        // testMain.delete(1L);

        // testMain.getTest_SessionCache();
        // testMain.loadTest_SessionCache();
        testMain.getTest_FactoryCache();
    }
}

Log4J.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>
	
	<appender name="rootAppender" class="org.apache.log4j.varia.NullAppender"/>
	
	<appender name="TEST"
		class="org.apache.log4j.RollingFileAppender">
		<param name="MaxFileSize" value="5MB" />
    	<param name="MaxBackupIndex" value="65535" />
		<param name="file" value="D:/log/test.log" />
		<param name="append" value="true" />
		<layout class="org.apache.log4j.PatternLayout">
			<param name="ConversionPattern" value="%d{yyyy/MM/dd HH:mm:ss.SSS} %x LOCATION=%C{1}.%M(Line:%L) %m%n" />
		</layout>
		<filter class="org.apache.log4j.varia.LevelRangeFilter">
			<param name="LevelMin" value="DEBUG" />
		</filter>
	</appender>
	
	<appender name="CONSOLE"
        class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d{yyyy/MM/dd HH:mm:ss.SSS} %p %c %x %m%n" />
        </layout>
        <filter class="org.apache.log4j.varia.LevelRangeFilter">
            <param name="LevelMin" value="DEBUG" />
        </filter>
    </appender>
	
	<logger name="net.sf.ehcache" class="org.apache.log4j.Logger" additivity="false">
        <level value="DEBUG" />
        <appender-ref ref="TEST" />
        <appender-ref ref="CONSOLE"/>
    </logger>
    
<!--     <logger name="org.hibernate.SQL" class="org.apache.log4j.Logger" additivity="false">
        <level value="DEBUG" />
        <appender-ref ref="TEST" />
        <appender-ref ref="CONSOLE"/>
    </logger> -->
    <logger name="org.hibernate.cache" class="org.apache.log4j.Logger" additivity="false">
        <level value="DEBUG" />
        <appender-ref ref="TEST" />
        <appender-ref ref="CONSOLE"/>
    </logger>
	
	<root>
		<level value="WARN"/>
		<appender-ref ref="APP"/>
		<appender-ref ref="CONSOLE"/>
	</root>
	
</log4j:configuration>