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   

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   

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   

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   

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   

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   

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   

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   

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   

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