[spring,hibernate] spring和hibernate的整合

Spring对Hibernate的集成提供了很好的支持,Spring提供了对sessionfactory的初始化,用户不用再关心session的open,close,同时,Spring还提供了灵活的事务声明.

本文通过实例简单讲述如何在Spring中集成Hibernate.

1,将hibernate的配置加入到Spring的配置中(对datasource和sessionfactory进行配置):

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  1. <bean id="dataSource"  
  2.         class="org.springframework.jdbc.datasource.DriverManagerDataSource">  
  3.         <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />  
  4.         <property name="url" value="jdbc:oracle:thin:@localhost:1521:ORCL" />  
  5.         <property name="username" value="user" />  
  6.         <property name="password" value="pwd" />  
  7.     </bean>  
  8.     <bean id="mySessionFactory"  
  9.         class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">  
  10.         <property name="dataSource" ref="dataSource" />  
  11.         <property name="mappingResources">  
  12.             <list>  
  13.                 <value>com/test/spring/hibernate/Hbtest.hbm.xml  
  14.                 </value>  
  15.             </list>  
  16.         </property>  
  17.         <property name="hibernateProperties">  
  18.             <value>  
  19.                 hibernate.dialect=org.hibernate.dialect.Oracle10gDialect  
  20.                 hibernate.show_sql=true  
  21.                 hibernate.format_sql=true  
  22.                 hibernate.current_session_context_class=thread  
  23.             </value>  
  24.         </property>  
  25.     </bean>  
<bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
        <property name="url" value="jdbc:oracle:thin:@localhost:1521:ORCL" />
        <property name="username" value="user" />
        <property name="password" value="pwd" />
    </bean>
    <bean id="mySessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="mappingResources">
            <list>
                <value>com/test/spring/hibernate/Hbtest.hbm.xml
                </value>
            </list>
        </property>
        <property name="hibernateProperties">
            <value>
                hibernate.dialect=org.hibernate.dialect.Oracle10gDialect
                hibernate.show_sql=true
                hibernate.format_sql=true
                hibernate.current_session_context_class=thread
            </value>
        </property>
    </bean>
Hibernate的配置也可以单独放在hibernate.cfg.xml文件中,然后通过如下的配置指向config文件,这样在spring配置中就不要配置dataSource和其他Hibernate相关的信息了.
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  1. <bean id="mySessionFactory"  
  2.     class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">  
  3.     <property name="configLocation" value="classpath:conf/Hibernate.cfg.xml" />  
  4. </bean>  
    <bean id="mySessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="configLocation" value="classpath:conf/Hibernate.cfg.xml" />
    </bean>
2,将sessionfactory注入到DAO中,通过sessionfactory操作Hibernate提供的API:
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  1. <bean id="PlainHibernateDAO" class="com.test.spring.hibernate.PlainHibernateDAO">  
  2.     <property name="sessionFactory" ref="mySessionFactory" />  
  3. </bean>  
    <bean id="PlainHibernateDAO" class="com.test.spring.hibernate.PlainHibernateDAO">
        <property name="sessionFactory" ref="mySessionFactory" />
    </bean>
应用实例:

1,通过继承HibernateDaoSupport 或者自己实例化HibernateTemplate来使用HibernateTemplate,HibernateTemplate 会确保当前Hibernate的 Session 对象的正确打开和关闭，并直接参与到事务管理中去,不要用户去管session的打开和关闭.然后直接调用HibernateTemplate提供的方法.

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  1. public class DAOSupportDAO extends HibernateDaoSupport {  
  2.   
  3.     public void persist2(Hbtest transientInstance) {  
  4.         log.debug("persisting Hbtest instance");  
  5.         try {  
  6.             this.getHibernateTemplate().save(transientInstance);  
  7.             log.debug("persist successful");  
  8.         } catch (RuntimeException re) {  
  9.             log.error("persist failed", re);  
  10.             throw re;  
  11.         }  
  12.     }  
  13.   
  14. ...  
  15.   
  16. }  
public class DAOSupportDAO extends HibernateDaoSupport {

    public void persist2(Hbtest transientInstance) {
        log.debug("persisting Hbtest instance");
        try {
            this.getHibernateTemplate().save(transientInstance);
            log.debug("persist successful");
        } catch (RuntimeException re) {
            log.error("persist failed", re);
            throw re;
        }
    }

...

}
2,通过继承HibernateDaoSupport 使用SessionFactory.
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  1. public class DAOSupportDAO extends HibernateDaoSupport {  
  2.     private static final Log log = LogFactory.getLog(DAOSupportDAO.class);  
  3.      
  4.     public void persist(Hbtest transientInstance) {  
  5.         log.debug("persisting Hbtest instance");  
  6.         try {  
  7.             this.getSessionFactory().getCurrentSession().save(transientInstance);  
  8.             log.debug("persist successful");  
  9.         } catch (RuntimeException re) {  
  10.             log.error("persist failed", re);  
  11.             throw re;  
  12.         }  
  13.     }  
public class DAOSupportDAO extends HibernateDaoSupport {
    private static final Log log = LogFactory.getLog(DAOSupportDAO.class);
   
    public void persist(Hbtest transientInstance) {
        log.debug("persisting Hbtest instance");
        try {
            this.getSessionFactory().getCurrentSession().save(transientInstance);
            log.debug("persist successful");
        } catch (RuntimeException re) {
            log.error("persist failed", re);
            throw re;
        }
    }
3,通过注入SessionFactory(推荐做法:好处是不会引入Spring的类)
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  1. public class PlainHibernateDAO {  
  2.     private static final Log log = LogFactory.getLog(PlainHibernateDAO.class);  
  3.     private SessionFactory sessionFactory;  
  4.   
  5.     public void setSessionFactory(SessionFactory sessionFactory) {  
  6.         this.sessionFactory = sessionFactory;  
  7.     }  
  8.     public void persist(Hbtest transientInstance) {  
  9.         log.debug("persisting Hbtest instance");  
  10.         try {  
  11.             sessionFactory.getCurrentSession().save(transientInstance);  
  12.             log.debug("persist successful");  
  13.         } catch (RuntimeException re) {  
  14.             log.error("persist failed", re);  
  15.             throw re;  
  16.         }  
  17.     }  
public class PlainHibernateDAO {
    private static final Log log = LogFactory.getLog(PlainHibernateDAO.class);
    private SessionFactory sessionFactory;

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }
    public void persist(Hbtest transientInstance) {
        log.debug("persisting Hbtest instance");
        try {
            sessionFactory.getCurrentSession().save(transientInstance);
            log.debug("persist successful");
        } catch (RuntimeException re) {
            log.error("persist failed", re);
            throw re;
        }
    }
对于事务的管理:

1,显示的用Hibernate提供的 SessionFactory.getCurrentSession().beginTransaction(),commit,这时候

hibernateProperties要配置hibernate.current_session_context_class=thread

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  1. <SPAN style="COLOR: #000000">        <property name="hibernateProperties">  
  2.             <value>  
  3.                 hibernate.current_session_context_class=thread  
  4.                      
  5.             </value></SPAN>  
        <property name="hibernateProperties">
            <value>
                hibernate.current_session_context_class=thread
                   
            </value>

2,利用Spring的事务声明来做管理:hibernateProperties不能配置hibernate.current_session_context_class=thread 

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  1. <tx:advice id="txAdvice" transaction-manager="txManager">  
  2.         <tx:attributes>  
  3.             <tx:method name="*" propagation="REQUIRED"/>  
  4.         </tx:attributes>  
  5.     </tx:advice>  
  6.   
  7.     <bean id="txManager"  
  8.         class="org.springframework.orm.hibernate3.HibernateTransactionManager">  
  9.         <property name="sessionFactory" ref="mySessionFactory" />  
  10.     </bean>  
  11.   
  12.     <aop:config>  
  13.         <aop:pointcut id="persistOperation"  
  14.             expression="execution(* com.test.spring.hibernate.PlainHibernateDAO.*(..))" />  
  15.         <aop:advisor advice-ref="txAdvice" pointcut-ref="persistOperation" />  
  16.          
  17.     </aop:config>  
<tx:advice id="txAdvice" transaction-manager="txManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <bean id="txManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="mySessionFactory" />
    </bean>

    <aop:config>
        <aop:pointcut id="persistOperation"
            expression="execution(* com.test.spring.hibernate.PlainHibernateDAO.*(..))" />
        <aop:advisor advice-ref="txAdvice" pointcut-ref="persistOperation" />
       
    </aop:config>

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原文地址：https://www.cnblogs.com/kentyouyou/p/3146265.html