Spring3 整合 Hibernate4实现数据库操作(1)

Hibernate知识学习：http://justsee.iteye.com/blog/1061576

注意Hibernate4在开发当中的一些改变  ：http://snake-hand.iteye.com/blog/1995592

    //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.MySQL5Dialecthibernate.hbm2ddl.auto=updatehibernate.show_sql=truehibernate.format_sql=falsehibernate.cache.use_second_level_cache=truehibernate.cache.use_query_cache=falsehibernate.cache.provider_class=org.hibernate.cache.EhCacheProviderhibernate.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;  }  @Overridepublic void saveMessage(TestMessage tm) {Session session = this.getSession();Transaction tran = session.beginTransaction();session.save(tm); tran.commit();}@Overridepublic 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();}
}