ThoughtWorks

PerrynFowler

import org.hibernate.event.PostLoadEvent;
import org.hibernate.event.PostLoadEventListener;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.config.AutowireCapableBeanFactory;

public class SpringHibernateInjector implements PostLoadEventListener, BeanFactoryAware{

    AutowireCapableBeanFactory beanFactory;
   
    public void onPostLoad(PostLoadEvent event) {
        Object hibernateObject = event.getEntity();
        beanFactory.autowireBeanProperties(hibernateObject, AutowireCapableBeanFactory.AUTOWIRE_BY_NAME, false);   
    }

    public void setBeanFactory(BeanFactory factory)  {
        beanFactory = (AutowireCapableBeanFactory) factory;
    }

}

<bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource">
            <ref bean="dataSource" />
        </property>
        <property name="mappingResources">
            <list>
                domains.hbm.xml here
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">
                    org.hibernate.dialect.Oracle9Dialect
                </prop>
                <prop key="hibernate.query.substitutions">
                    true 1, false 0
                </prop>
                <prop key="hibernate.show_sql">false</prop>
            </props>
        </property>
       <property name="eventListeners">
          <map>
            <entry key="post-load">
              <!-- This hibernate interceptor allows us to use Spring to inject services
 into Hibernate managed domain objects -->   
              <bean class="yourpackage.SpringHibernateInjector"/>
            </entry>        
           </map>
    </property>
    </bean>

domain object

package hibernate;

import java.util.List;

public class User {

    private UserManager userManager;

    public List getArticles() {
        return userManager.getArticleByUser(this);
    }

    public void save() {
        userManager.save(this);
    }

    public void delete() {
        userManager.delete(this);
    }

    public UserManager getUserManager() {
        return userManager;
    }

    public void setUserManager(UserManager userManager) {
        this.userManager = userManager;
    }

}

package hibernate;

public class Article {
    private User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }
    
}

package hibernate;

import java.util.List;

public interface UserManager {
    public void save(User user);
    public void delete(User user);
    public List getArticleByUser(User user);
}

在web层可以这样用
user.save();
user.delete();

最有用的地方是下面所描述的
user.getArticles(),实际调用的是userManager.getArticleByUser(User user);
只需要在Article端配置many-to-one到User,而不需要User端的one-to-many到Article,利用这个单向的关联来查询得到列表
1.是可以实现延迟加载的效果,并且不用open session in view
2.可以分页,分页这个方式也比较特别,由javaeye的Prentice网友提出来的(一种传递分页参数的方法),使用ServletFilter或Interceptor在WEB层截获分页的参数，
封装成一个对象，然后保存在threadlocal中,Service进行查询的时候可以按需从threadlocal中获得分页参数。