Creating DAO Objects

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For ease of maintenance, we used to create another Java class to handle data accessing jobs.

1. Create EventDAO.java

 package events;

 import java.util.Date;
 import java.util.List;

 import org.hibernate.Session;
 import org.zkoss.zkplus.hibernate.HibernateUtil;

 public class EventDAO {
     Session currentSession() {
         return HibernateUtil.currentSession();
     }
     public void saveOrUpdate(Event anEvent, String title, Date date) {
         Session sess =  currentSession();
         anEvent.setTitle(title);
         anEvent.setDate(date);
         sess.saveOrUpdate(anEvent);
     }
     public void delete(Event anEvent) {
         Session sess =  currentSession();
         sess.delete(anEvent);
     }
     public Event findById(Long id) {
         Session sess =  currentSession();
         return (Event) sess.load(Event.class, id);
     }
     public List findAll() {
         Session sess =  currentSession();
         return sess.createQuery("from Event").list();
     }
 }

1. You have to compile the Java source, and place the class file in a directory called classes in the Web development folder, and in its correct package. (ex.$myApp/WEB-INF/classes/event/EventDAO.class)