Spring3 整合 Hibernate4实现数据库操作(1)

    //首先在web.xml中加入OpenSessionInViewFilter过滤器

　　 <filter>  
	  <filter-name>openSessionInViewFilter</filter-name>  
	  <filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>  
    </filter>
    
    <filter-mapping> 
       <filter-name>openSessionInViewFilter</filter-name> 
       <url-pattern>/*</url-pattern>  
    </filter-mapping>  

在applicationContext.xml中的sessionFactory 中 添加<property name="hibernate.current_session_context_class">thread</property> 属性

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
  		<!-- 依赖注入数据源，正式上下文定义的dataSource -->
	    <property name="dataSource" ref="dataSource" />
  
	    <property name="hibernateProperties">
	    	<value>
	            hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
	            hibernate.hbm2ddl.auto=update
	            hibernate.show_sql=true
	            hibernate.format_sql=false
	            hibernate.cache.use_second_level_cache=true
	            hibernate.cache.use_query_cache=false
	            hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider
	            hibernate.current_session_context_class=thread
	        </value>
	   </property>
	   
	    <!--通过配置文件的方式获取数据源-->
	    <property name="mappingResources">
	    	<list>
	    	   <!-- 以下用来列出所有的PO映射文件 -->
		       <value>hibernate.cfg.xml</value>
		       <value>test.cfg.xml</value>
	    	</list>
	    </property>	   
	   
  </bean>

在dao层部分的代码如下，通过sessionFactory可以获得当前的事务的session，通过session实现对数据库的操作

public class MessageDaoImpl implements MessageDao{
	
	private SessionFactory sessionFactory;  
     
    public Session getSession() {  
        return sessionFactory.getCurrentSession();  
    }  
  
    public SessionFactory getSessionFactory() {  
        return sessionFactory;  
    }  
  
    public void setSessionFactory(SessionFactory sessionFactory) {  
        this.sessionFactory = sessionFactory;  
    }  
	
	@Override
	public void saveMessage(TestMessage tm) {
		Session session = this.getSession();
		Transaction tran = session.beginTransaction();
		session.save(tm); 
		tran.commit();
	}

	@Override
	public String getMessage() {
		Session session = this.getSession();
		Transaction tran = session.beginTransaction();
		List<TestMessage> datas = session.createQuery("From TestMessage").list();
		tran.commit();
		return datas.get(7).getContent();
	}
}