Hibernate+EhCache配置二级缓存

FROM:  http://sjsky.iteye.com/blog/1312132

本文主要讲一讲Hibernate+EhCache配置二级缓存的基本使用方法,主要分以下两个方面介绍:

 

(有关EhCache的基础介绍可参见:http://sjsky.iteye.com/blog/1288257 )

  • Cache的多种配置方法
  • Hibernate+EhCache集成demo

[一]、Cache的多种配置方法

       Javabean cache的配置有三种,下面将一一介绍,具体如下::

        (1).bean中注解配置的方式: @Cache(usage = CacheConcurrencyStrategy.READ_WRITE)

        (2).hibernate.cfg.xml中标签配置方式: <class-cache class="" usage="" />

        (3).映射文件*.hb.xml中标签配置方式: <cache usage=" />

 

      1. classpath:ehcahce.xml配置文件如下:

 

Xml代码   收藏代码
  1. <?xml version="1.0" encoding="UTF-8"?>  
  2. <ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
  3.          xsi:noNamespaceSchemaLocation="ehcache.xsd"  
  4.          updateCheck="true" monitoring="autodetect"  
  5.          dynamicConfig="true">  
  6.   
  7.     <diskStore path="java.io.tmpdir"/>  
  8.   
  9.     <transactionManagerLookup class="net.sf.ehcache.transaction.manager.DefaultTransactionManagerLookup"  
  10.                               properties="jndiName=java:/TransactionManager" propertySeparator=";"/>  
  11.   
  12.     <cacheManagerEventListenerFactory class="" properties=""/>  
  13.   
  14.     <defaultCache  
  15.             maxElementsInMemory="100"  
  16.             eternal="false"  
  17.             timeToIdleSeconds="120"  
  18.             timeToLiveSeconds="120"  
  19.             overflowToDisk="true"  
  20.             diskSpoolBufferSizeMB="30"  
  21.             maxElementsOnDisk="100"  
  22.             diskPersistent="false"  
  23.             diskExpiryThreadIntervalSeconds="120"  
  24.             memoryStoreEvictionPolicy="LRU"  
  25.             statistics="false"  
  26.             />  
  27.   
  28.     <cache name="org.hibernate.cache.StandardQueryCache"  
  29.         maxElementsInMemory="5"   
  30.         eternal="false"   
  31.         timeToLiveSeconds="120"  
  32.         overflowToDisk="true" />  
  33.   
  34.     <cache name="org.hibernate.cache.UpdateTimestampsCache"  
  35.         maxElementsInMemory="5000"   
  36.         eternal="true"   
  37.         overflowToDisk="true" />  
  38.   
  39.     <cache name="sampleCache1"  
  40.            maxElementsInMemory="10000"  
  41.            maxElementsOnDisk="1000"  
  42.            eternal="false"  
  43.            overflowToDisk="true"  
  44.            diskSpoolBufferSizeMB="20"  
  45.            timeToIdleSeconds="300"  
  46.            timeToLiveSeconds="600"  
  47.            memoryStoreEvictionPolicy="LFU"  
  48.            transactionalMode="off"  
  49.             />  
  50.   
  51.     <cache name="sampleCache2"  
  52.            maxElementsInMemory="1000"  
  53.            eternal="true"  
  54.            overflowToDisk="false"  
  55.            memoryStoreEvictionPolicy="FIFO"  
  56.             />  
  57. </ehcache>  

    2.hibernate配置文件:hibernate.cfg.xml

Xml代码   收藏代码
  1. <!DOCTYPE hibernate-configuration  
  2.     PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"  
  3.     "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">  
  4.   
  5. <hibernate-configuration>  
  6.   
  7.     <session-factory>  
  8.         <property name="connection.driver_class">  
  9.             oracle.jdbc.driver.OracleDriver  
  10.         </property>  
  11.         <property name="connection.url">  
  12.             jdbc:oracle:thin:@localhost:1521:ora11g  
  13.         </property>  
  14.         <property name="connection.username">mytest</property>  
  15.         <property name="connection.password">111111</property>  
  16.   
  17.         <property name="dialect">  
  18.             org.hibernate.dialect.Oracle9Dialect  
  19.         </property>  
  20.   
  21.         <property name="connection.useUnicode">true</property>  
  22.         <property name="connection.characterEncoding">UTF-8</property>  
  23.         <property name="connection.SetBigStringTryClob">true</property>  
  24.         <property name="connection.pool_size">10</property>  
  25.         <property name="hibernate.jdbc.batch_size">10</property>  
  26.   
  27.   
  28.         <property name="show_sql">true</property>  
  29.         <property name="format_sql">false</property>  
  30.         <property name="current_session_context_class">thread</property>  
  31.         <property name="hbm2ddl.auto">update</property>  
  32.         <!--  Hibernate 3.3 and higher -->  
  33.         <!--  
  34.         <property name="hibernate.cache.region.factory_class">  
  35.             net.sf.ehcache.hibernate.EhCacheRegionFactory  
  36.         </property>  
  37.         <property name="hibernate.cache.region.factory_class">  
  38.             net.sf.ehcache.hibernate.SingletonEhCacheRegionFactory  
  39.         </property>  
  40.         -->  
  41.         <!-- hibernate3.0-3.2 cache config-->  
  42.         <!--   
  43.         <property name="hibernate.cache.region.factory_class">  
  44.             net.sf.ehcache.hibernate.EhCacheProvider  
  45.         </property>  
  46.         -->  
  47.         <property name="hibernate.cache.provider_class">  
  48.             net.sf.ehcache.hibernate.SingletonEhCacheProvider  
  49.         </property>  
  50.           
  51.         <!-- Enable Second-Level Cache and Query Cache Settings -->  
  52.         <property name="hibernate.cache.use_second_level_cache">  
  53.             true  
  54.         </property>  
  55.         <property name="hibernate.cache.use_query_cache">  
  56.             true  
  57.         </property>  
  58.   
  59.         <!-- 注解配置  -->  
  60.         <mapping class="michael.cache.ehcache.hibernate.EhUserInfo" />  
  61.         <mapping class="michael.cache.ehcache.hibernate.EhBlogTopic" />  
  62.         <mapping class="michael.cache.ehcache.hibernate.EhBlogTopic2" />  
  63.   
  64.         <!-- 映射文件 -->  
  65.         <mapping  
  66.             resource="michael/cache/ehcache/hibernate/tb_EhBlogTopic3.hb.xml" />  
  67.   
  68.         <!-- class-cache config -->  
  69.         <class-cache class="michael.cache.ehcache.hibernate.EhBlogTopic"  
  70.             usage="read-write" />  
  71.   
  72.     </session-factory>  
  73. </hibernate-configuration>  

   3.相关javabean代码片段如下:

      (1).hibernate.cfg.xml中<calss-cache>标签配置的:EhBlogTopic.java:

Java代码   收藏代码
  1. /** 
  2.  * @blog http://sjsky.iteye.com 
  3.  * @author Michael 
  4.  */  
  5. @Entity  
  6. @Table(name = "MY_TB_EH_BLOG_TOPIC")  
  7. public class EhBlogTopic implements Serializable {  
  8.   
  9.     /** 
  10.      * serialVersionUID 
  11.      */  
  12.     private static final long serialVersionUID = -570936907944909799L;  
  13.   
  14.     private Integer id;  
  15.   
  16.     private String userId;  
  17.   
  18.     private String topic;  
  19.   
  20.     private String site;  
  21.   
  22.     //其他省略  
  23. }  

    (2). bean中注解的方式配置cache的:EhBlogTopic2.java

Java代码   收藏代码
  1. /** 
  2.  * @blog http://sjsky.iteye.com 
  3.  * @author Michael 
  4.  */  
  5. @Entity  
  6. @Table(name = "MY_TB_EH_BLOG_TOPIC2")  
  7. @Cache(usage = CacheConcurrencyStrategy.READ_WRITE)  
  8. public class EhBlogTopic2 implements Serializable {  
  9.       //属性和EhBlogTopic一样  
  10.      //其他省略  
  11. }  

    (3). 映射文件*.hb.xml中添加cache标签的: EhBlogTopic3.java

Java代码   收藏代码
  1. /** 
  2.  * @blog http://sjsky.iteye.com 
  3.  * @author Michael 
  4.  */  
  5. public class EhBlogTopic3 implements Serializable {  
  6.    //属性和EhBlogTopic一样  
  7.    //其他省略  
  8. }  

     tb_EhBlogTopic3.hb.xml

Xml代码   收藏代码
  1. <?xml version="1.0"?>  
  2. <!DOCTYPE hibernate-mapping PUBLIC  
  3.     "-//Hibernate/Hibernate Mapping DTD 2.0//EN"  
  4.     "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">  
  5.   
  6. <hibernate-mapping package="michael.cache.ehcache.hibernate">  
  7.   
  8.     <class name="EhBlogTopic3" table="MY_TB_EH_BLOG_TOPIC3">  
  9.         <cache usage="read-write" />  
  10.         <id name="id" type="int" unsaved-value="null">  
  11.             <generator class="increment" />  
  12.         </id>  
  13.         <property name="userId" column="USER_ID" type="string"  
  14.             not-null="false" length="20" />  
  15.   
  16.         <property name="topic" column="TOPIC" type="string"  
  17.             not-null="false" length="100" />  
  18.         <property name="site" column="SITE" type="string"  
  19.             not-null="false" length="100" />  
  20.   
  21.     </class>  
  22. </hibernate-mapping>  

      (4). 没有配置cache的bean:EhUserInfo.java

Java代码   收藏代码
  1. /** 
  2.  * @blog http://sjsky.iteye.com 
  3.  * @author Michael 
  4.  */  
  5. @Entity  
  6. @Table(name = "MY_TB_EH_USER_INFO")  
  7. public class EhUserInfo implements Serializable {  
  8.   
  9.     /** 
  10.      * serialVersionUID 
  11.      */  
  12.     private static final long serialVersionUID = 930384253681679239L;  
  13.   
  14.     private Integer id;  
  15.   
  16.     private String userId;  
  17.   
  18.     private String userName;  
  19.   
  20.     private String otherInfo;  
  21.   
  22.     /** 
  23.      * @return the id 
  24.      */  
  25.     @Id  
  26.     @GeneratedValue  
  27.     @Column(name = "ID")  
  28.     public Integer getId() {  
  29.         return id;  
  30.     }  
  31.   
  32.   //其他省略。。。  
  33.   
  34. }  

 

   4.测试运行代码如下:

 

Java代码   收藏代码
  1. package michael.cache.ehcache.hibernate;  
  2.   
  3. import java.util.List;  
  4.   
  5. import michael.hibernate.bigstring.oracle.BigStrBlob;  
  6. import net.sf.ehcache.Cache;  
  7. import net.sf.ehcache.CacheManager;  
  8.   
  9. import org.hibernate.Query;  
  10. import org.hibernate.Session;  
  11. import org.hibernate.SessionFactory;  
  12. import org.hibernate.Transaction;  
  13. import org.hibernate.cfg.AnnotationConfiguration;  
  14. import org.hibernate.cfg.Configuration;  
  15.   
  16. /** 
  17.  *  
  18.  * @blog http://sjsky.iteye.com 
  19.  * @author Michael 
  20.  */  
  21. public class TestEhcacheHibernate {  
  22.   
  23.     /** 
  24.      * @param args 
  25.      */  
  26.     @SuppressWarnings("unchecked")  
  27.     public static void main(String[] args) {  
  28.         testMulitConfigMethod();  
  29.     }  
  30.   
  31.     /** 
  32.      * 测试多种配置缓存的方法 
  33.      */  
  34.     public static void testMulitConfigMethod() {  
  35.         SessionFactory sessionFactory = null;  
  36.         try {  
  37.             System.out.println("ehcache - hibernate Test ...");  
  38.             Configuration config = new AnnotationConfiguration()  
  39.                     .configure("michael/cache/ehcache/hibernate/hibernate.cfg.xml");  
  40.             System.out.println("hibernate config successful :" + config);  
  41.             sessionFactory = config.buildSessionFactory();  
  42.             Transaction ta = null;  
  43.             try {  
  44.                 Session session = sessionFactory.getCurrentSession();  
  45.                 ta = session.beginTransaction();  
  46.             } catch (Exception e) {  
  47.                 e.printStackTrace();  
  48.                 ta.rollback();  
  49.             }  
  50.             String[] cacheNames = CacheManager.getInstance().getCacheNames();  
  51.             System.out.println("缓存的key cacheNames length := "  
  52.                     + cacheNames.length + " 具体详细列表如下:");  
  53.             for (String name : cacheNames) {  
  54.                 System.out.println("name := " + name);  
  55.             }  
  56.         } catch (Exception e) {  
  57.             e.printStackTrace();  
  58.         }  
  59.         System.out.println("ehcache - hibernate Test end.");  
  60.     }  
  61. }  

 运行结果如下:

 

ehcache - hibernate Test ...
hibernate config successful :org.hibernate.cfg.AnnotationConfiguration@193c0cf
2011-12-15 11:32:36 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic]; using defaults.
2011-12-15 11:32:36 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic2]; using defaults.
2011-12-15 11:32:36 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic3]; using defaults.
2011-12-15 11:32:37 net.sf.ehcache.util.UpdateChecker doCheck
信息: New update(s) found: 2.4.6 [http://www.terracotta.org/confluence/display/release/Release+Notes+Ehcache+Core+2.4]. Please check http://ehcache.org for the latest version.
缓存的key cacheNames length := 7 具体详细列表如下:
name := sampleCache2
name := michael.cache.ehcache.hibernate.EhBlogTopic2 
name := org.hibernate.cache.UpdateTimestampsCache
name := sampleCache1
name := michael.cache.ehcache.hibernate.EhBlogTopic 
name := org.hibernate.cache.StandardQueryCache
name := michael.cache.ehcache.hibernate.EhBlogTopic3 
ehcache - hibernate Test end.

  从运行结果可见:三种方式的缓存配置都已经成功。

 

[二]、Hibernate+EhCache集成demo

      1.分别初始化EhUserInfo(没有配置cache的)和EhBlogTopic(配置过cache的)数据如下:

EhUserInfo:


  EhBlogTopic: 

   2.演示代码:

Java代码   收藏代码
  1. package michael.cache.ehcache.hibernate;  
  2.   
  3. import java.util.List;  
  4.   
  5. import michael.hibernate.bigstring.oracle.BigStrBlob;  
  6. import net.sf.ehcache.Cache;  
  7. import net.sf.ehcache.CacheManager;  
  8.   
  9. import org.hibernate.Query;  
  10. import org.hibernate.Session;  
  11. import org.hibernate.SessionFactory;  
  12. import org.hibernate.Transaction;  
  13. import org.hibernate.cfg.AnnotationConfiguration;  
  14. import org.hibernate.cfg.Configuration;  
  15.   
  16. /** 
  17.  *  
  18.  * @blog http://sjsky.iteye.com 
  19.  * @author Michael 
  20.  */  
  21. public class TestEhcacheHibernate {  
  22.   
  23.     /** 
  24.      * @param args 
  25.      */  
  26.     @SuppressWarnings("unchecked")  
  27.     public static void main(String[] args) {  
  28.         SessionFactory sessionFactory = null;  
  29.         try {  
  30.             System.out.println("ehcache - hibernate Test ...");  
  31.             Configuration config = new AnnotationConfiguration()  
  32.                     .configure("michael/cache/ehcache/hibernate/hibernate.cfg.xml");  
  33.   
  34.             sessionFactory = config.buildSessionFactory();  
  35.             System.out.println("buildSessionFactory===============");  
  36.   
  37.             System.out.println("====================================");  
  38.             System.out.println("session open ....");  
  39.             System.out.println("同一个session(一级缓存默认的)中,没有配置cache的Bean");  
  40.             Transaction ta = null;  
  41.             try {  
  42.                 Session session = sessionFactory.getCurrentSession();  
  43.                 String hsql = "select t from EhUserInfo t ";  
  44.                 ta = session.beginTransaction();  
  45.                 Query query = session.createQuery(hsql);  
  46.                 System.out.println("查询全部query.list().size:"  
  47.                         + query.list().size());  
  48.   
  49.                 System.out.println("再根据ID=1查询某记录时不会再去查数据库,故不会打印hsql");  
  50.                 EhUserInfo vo1 = (EhUserInfo) session.get(EhUserInfo.class, 1);  
  51.                 System.out.println("根据ID=1找到的记录:" + vo1);  
  52.                 ta.commit();  
  53.             } catch (Exception e) {  
  54.                 e.printStackTrace();  
  55.                 ta.rollback();  
  56.             }  
  57.             System.out.println("session closed.");  
  58.   
  59.             System.out.println("session open ....");  
  60.             try {  
  61.                 Session session = sessionFactory.getCurrentSession();  
  62.                 ta = session.beginTransaction();  
  63.                 System.out.println("第一次根据ID=1查询某记录时,会打印hsql");  
  64.                 EhUserInfo vo1 = (EhUserInfo) session.get(EhUserInfo.class, 1);  
  65.                 System.out.println("根据ID=1找到的记录:" + vo1);  
  66.                 ta.commit();  
  67.             } catch (Exception e) {  
  68.                 e.printStackTrace();  
  69.                 ta.rollback();  
  70.             }  
  71.             System.out.println("session closed.");  
  72.   
  73.             System.out.println("====================================");  
  74.             System.out.println("当前同一个sessionFactory,没有配置cache的Bean,");  
  75.             System.out.println("session open ....");  
  76.             try {  
  77.                 Session session = sessionFactory.getCurrentSession();  
  78.                 ta = session.beginTransaction();  
  79.                 System.out.println("第一次根据ID=1查询记录时会再去查数据库,故打印hsql如下:");  
  80.                 EhUserInfo vo1 = (EhUserInfo) session.get(EhUserInfo.class, 1);  
  81.                 System.out.println("根据ID=1找到的记录:" + vo1);  
  82.                 ta.commit();  
  83.             } catch (Exception e) {  
  84.                 e.printStackTrace();  
  85.                 ta.rollback();  
  86.             }  
  87.             System.out.println("session closed.");  
  88.             System.out.println("====================================");  
  89.             String[] cacheNames = CacheManager.getInstance().getCacheNames();  
  90.             System.out.println("缓存的key cacheNames length := "  
  91.                     + cacheNames.length);  
  92.             for (String name : cacheNames) {  
  93.                 System.out.println("name := " + name);  
  94.             }  
  95.   
  96.             System.out.println("====================================");  
  97.             System.out.println("同一个session(一级缓存默认的)中,配置cache的Bean");  
  98.   
  99.             System.out.println("session open ....");  
  100.             try {  
  101.                 Session session = sessionFactory.getCurrentSession();  
  102.                 String hsql = "select t from EhBlogTopic t ";  
  103.                 ta = session.beginTransaction();  
  104.                 Query query = session.createQuery(hsql);  
  105.                 query.setCacheable(true);  
  106.                 System.out.println("查询全部query.list().size:"  
  107.                         + query.list().size());  
  108.   
  109.                 Cache myCache1 = CacheManager.getInstance().getCache(  
  110.                         "michael.cache.ehcache.hibernate.EhBlogTopic");  
  111.                 System.out.println("查询到EhBlogTopic cache size:"  
  112.                         + myCache1.getKeys().size());  
  113.                 myCache1 = CacheManager.getInstance().getCache(  
  114.                         "michael.cache.ehcache.hibernate.EhBlogTopic");  
  115.                 System.out.println("EhBlogTopic cache size:"  
  116.                         + myCache1.getKeys().size() + ",详细记录如下:");  
  117.                 for (Object str : myCache1.getKeys()) {  
  118.                     System.out.println(str);  
  119.                 }  
  120.   
  121.                 System.out  
  122.                         .println("在同一个session,再根据ID=1查询记录时不会再去查数据库,故不会打印hsql");  
  123.                 EhBlogTopic vo1 = (EhBlogTopic) session.get(EhBlogTopic.class,  
  124.                         1);  
  125.                 System.out.println("根据ID=1找到的记录:" + vo1);  
  126.                 EhBlogTopic vo2 = new EhBlogTopic();  
  127.                 vo2.setId(10);  
  128.                 vo2.setUserId("michael");  
  129.                 vo2.setTopic("Myblog:11");  
  130.                 vo2.setSite("http://sjsky.iteye.com");  
  131.                 session.save(vo2);  
  132.                 ta.commit();  
  133.                 System.out.println("新增加一条记录ID=10");  
  134.             } catch (Exception e) {  
  135.                 e.printStackTrace();  
  136.                 ta.rollback();  
  137.             }  
  138.             System.out.println("session closed.");  
  139.   
  140.             System.out.println("====================================");  
  141.             Cache myCache1 = CacheManager.getInstance().getCache(  
  142.                     "michael.cache.ehcache.hibernate.EhBlogTopic");  
  143.             System.out.println("EhBlogTopic cache size:"  
  144.                     + myCache1.getKeys().size() + ",详细记录如下:");  
  145.             for (Object str : myCache1.getKeys()) {  
  146.                 System.out.println(str);  
  147.             }  
  148.   
  149.             System.out.println("====================================");  
  150.             System.out.println("在当前同一个sessionFactory,配置cache的bean");  
  151.             System.out.println("session open ....");  
  152.             try {  
  153.                 Session session = sessionFactory.getCurrentSession();  
  154.                 ta = session.beginTransaction();  
  155.                 System.out  
  156.                         .println("不管是否第一次查询ID=1的记录,如果cache中存在的,则不会再查数据库,故不打印hsql");  
  157.                 EhBlogTopic vo1 = (EhBlogTopic) session.get(EhBlogTopic.class,  
  158.                         1);  
  159.                 System.out.println("根据ID=1找到的记录:" + vo1);  
  160.                 System.out.println("查询之前session保存的数据ID=10,也不会再查数据库,故不打印hsql");  
  161.                 EhBlogTopic vo2 = (EhBlogTopic) session.get(EhBlogTopic.class,  
  162.                         10);  
  163.                 System.out.println("根据之前save的ID=10找到的记录:" + vo2);  
  164.                 ta.commit();  
  165.             } catch (Exception e) {  
  166.                 e.printStackTrace();  
  167.                 ta.rollback();  
  168.             }  
  169.             System.out.println("session closed.");  
  170.         } catch (Exception e) {  
  171.             e.printStackTrace();  
  172.         } finally {  
  173.             if (null != sessionFactory) {  
  174.                 sessionFactory.close();  
  175.   
  176.             }  
  177.         }  
  178.         System.out.println("sessionFactory  closed.");  
  179.     }  
  180. }  

 

 运行结果如下:

 

ehcache - hibernate Test ...
2011-12-15 13:27:15 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic]; using defaults.
2011-12-15 13:27:15 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic2]; using defaults.
2011-12-15 13:27:15 net.sf.ehcache.hibernate.AbstractEhcacheProvider buildCache
警告: Could not find a specific ehcache configuration for cache named [michael.cache.ehcache.hibernate.EhBlogTopic3]; using defaults.
buildSessionFactory===============
====================================
session open ....
同一个session(一级缓存默认的)中,没有配置cache的Bean
Hibernate: select ehuserinfo0_.ID as ID1_, ehuserinfo0_.USER_ID as USER2_1_, ehuserinfo0_.USER_NAME as USER3_1_, ehuserinfo0_.OHTER_INFO as OHTER4_1_ from MY_TB_EH_USER_INFO ehuserinfo0_
查询全部query.list().size:2
再根据ID=1查询某记录时不会再去查数据库,故不会打印hsql
根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhUserInfo@63b2e6
session closed.
session open ....
第一次根据ID=1查询某记录时,会打印hsql
Hibernate: select ehuserinfo0_.ID as ID1_0_, ehuserinfo0_.USER_ID as USER2_1_0_, ehuserinfo0_.USER_NAME as USER3_1_0_, ehuserinfo0_.OHTER_INFO as OHTER4_1_0_ from MY_TB_EH_USER_INFO ehuserinfo0_ where ehuserinfo0_.ID=?
根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhUserInfo@123a389
session closed.
====================================
当前同一个sessionFactory,没有配置cache的Bean,
session open ....
第一次根据ID=1查询记录时会再去查数据库,故打印hsql如下:
Hibernate: select ehuserinfo0_.ID as ID1_0_, ehuserinfo0_.USER_ID as USER2_1_0_, ehuserinfo0_.USER_NAME as USER3_1_0_, ehuserinfo0_.OHTER_INFO as OHTER4_1_0_ from MY_TB_EH_USER_INFO ehuserinfo0_ where ehuserinfo0_.ID=?
根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhUserInfo@429c19
session closed.
====================================
缓存的key cacheNames length := 7
name := sampleCache2
name := michael.cache.ehcache.hibernate.EhBlogTopic2
name := org.hibernate.cache.UpdateTimestampsCache
name := sampleCache1
name := michael.cache.ehcache.hibernate.EhBlogTopic
name := org.hibernate.cache.StandardQueryCache
name := michael.cache.ehcache.hibernate.EhBlogTopic3
====================================
同一个session(一级缓存默认的)中,配置cache的Bean
session open ....
Hibernate: select ehblogtopi0_.ID as ID2_, ehblogtopi0_.USER_ID as USER2_2_, ehblogtopi0_.TOPIC as TOPIC2_, ehblogtopi0_.SITE as SITE2_ from MY_TB_EH_BLOG_TOPIC ehblogtopi0_
查询全部query.list().size:9
查询到EhBlogTopic cache size:9
EhBlogTopic cache size:9,详细记录如下:
michael.cache.ehcache.hibernate.EhBlogTopic#6
michael.cache.ehcache.hibernate.EhBlogTopic#5
michael.cache.ehcache.hibernate.EhBlogTopic#7
michael.cache.ehcache.hibernate.EhBlogTopic#8
michael.cache.ehcache.hibernate.EhBlogTopic#2
michael.cache.ehcache.hibernate.EhBlogTopic#9
michael.cache.ehcache.hibernate.EhBlogTopic#1
michael.cache.ehcache.hibernate.EhBlogTopic#4
michael.cache.ehcache.hibernate.EhBlogTopic#3
在同一个session,再根据ID=1查询记录时不会再去查数据库,故不会打印hsql
根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhBlogTopic@11a0d35
Hibernate: insert into MY_TB_EH_BLOG_TOPIC (USER_ID, TOPIC, SITE, ID) values (?, ?, ?, ?)
新增加一条记录ID=10
session closed.
====================================
EhBlogTopic cache size:10,详细记录如下:
michael.cache.ehcache.hibernate.EhBlogTopic#6
michael.cache.ehcache.hibernate.EhBlogTopic#5
michael.cache.ehcache.hibernate.EhBlogTopic#7
michael.cache.ehcache.hibernate.EhBlogTopic#8
michael.cache.ehcache.hibernate.EhBlogTopic#2
michael.cache.ehcache.hibernate.EhBlogTopic#9
michael.cache.ehcache.hibernate.EhBlogTopic#10
michael.cache.ehcache.hibernate.EhBlogTopic#1
michael.cache.ehcache.hibernate.EhBlogTopic#4
michael.cache.ehcache.hibernate.EhBlogTopic#3
====================================
在当前同一个sessionFactory,配置cache的bean
session open ....
不管是否第一次查询ID=1的记录,如果cache中存在的,则不会再查数据库,故不打印hsql
根据ID=1找到的记录:michael.cache.ehcache.hibernate.EhBlogTopic@1321f5
查询之前session保存的数据ID=10,也不会再查数据库,故不打印hsql
根据之前save的ID=10找到的记录:michael.cache.ehcache.hibernate.EhBlogTopic@1a6518
session closed.
sessionFactory closed.

 

   我们从上面的详细运行日志中就可以看出cache的效果。

 

 

本文连接:http://sjsky.iteye.com/blog/1312132

posted @ 2016-12-04 20:54  剑芒  阅读(237)  评论(0编辑  收藏  举报