The Sri Lankan Javanese

hibernate-configuration file is as Following

This example is using annotated entity classes that genarated from eclipse.So no need to write xml mapping files for each entity.

 
 jdbc:derby://localhost:1527/catalogueDB;create=true
 org.apache.derby.jdbc.ClientDriver
 app
 app
 

   
 
 
 
 thread

 
 org.hibernate.dialect.DerbyDialect
 
 create
 org.hibernate.cache.NoCacheProvider
 true
 org.hibernate.transaction.JDBCTransactionFactory

 
 
 

package com.snk.model;


import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.GeneratedValue;

// Generated May 30, 2009 6:49:31 AM by Hibernate Tools 3.2.4.GA

/**
*  This class contains the course details.
* 
*/
@Entity
public class Course implements java.io.Serializable {

@Id
@GeneratedValue
private long courseId;
@Column
private String courseName;

public Course() {
}

public Course(String courseName) {
 this.courseName = courseName;
}

public long getCourseId() {
 return this.courseId;
}

public void setCourseId(long courseId) {
 this.courseId = courseId;
}

public String getCourseName() {
 return this.courseName;
}

public void setCourseName(String courseName) {
 this.courseName = courseName;
}

}


package com.snk.frontend;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.snk.controler.ServiceLocator;
import com.snk.model.Course;


/**
* Servlet implementation class View
*/
/**
* @author Administrator
*
*/
public class View extends HttpServlet {
private static final long serialVersionUID = 1L;
     
   /**
    * @see HttpServlet#HttpServlet()
    */
   public View() {
       super();
       // TODO Auto-generated constructor stub
   }

/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 PrintWriter out=response.getWriter();
 out.println("sanka do get");
 doPorocess(request, response);
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 PrintWriter out=response.getWriter();
 out.println("sanka do post");
 doPorocess(request, response);
}


protected void doPorocess(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 PrintWriter out=response.getWriter();
 ServiceLocator obj = new ServiceLocator();
 out.println("Before Insert three records\n");
 Long courseId1 = obj.saveCourse("Physics");
 Long courseId2 = obj.saveCourse("Chemistry");
 Long courseId3 = obj.saveCourse("Maths");

 showCourse(obj.listCourse(),out);
 out.println("End of Insert three records\n\n\n\n");
 obj.updateCourse(courseId3, "Mathematics");
 showCourse(obj.listCourse(),out);
 out.println("End of update three records\n\n\n\n");
 obj.deleteCourse(courseId2);
 out.println("End of delete chemistry records\n\n\n\n");
 showCourse(obj.listCourse(),out);

}

private void showCourse(List courses,PrintWriter out)
{
 for (Iterator iterator = courses.iterator(); iterator.hasNext();)
 {
  Course course = (Course) iterator.next();
  out.println("Cource name : "+course.getCourseName());
 }
}

}




package com.snk.controler;
import java.util.List;
import java.util.Iterator;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.snk.model.Course;
import com.snk.util.HibernateUtil;

public class ServiceLocator {


public Long saveCourse(String courseName)
{
 Session session = HibernateUtil.getSessionFactory().openSession();
 Transaction transaction = null;
 Long courseId = null;
 try {
  transaction = session.beginTransaction();
  Course course = new Course();
  course.setCourseName(courseName);
  courseId = (Long) session.save(course);
  transaction.commit();
 } catch (HibernateException e) {
  transaction.rollback();
  e.printStackTrace();
 } finally {
  session.close();
 }
 return courseId;

/* //Following Are the code in JPA for insert query
    EntityManagerFactory emf=Persistence.createEntityManagerFactory("hibernate-servlet");
    EntityManager em=emf.createEntityManager();
 Course course = new Course();
 course.setCourseName(courseName);
 course.setCourseId(200);
 Long courseId = 200L;
 em.persist(course);
 System.out.println("Afetr Save");*/


}

public List listCourse()
{
 Session session = HibernateUtil.getSessionFactory().openSession();
 Transaction transaction = null;
 try {
  transaction = session.beginTransaction();
  List courses = session.createQuery("from Course").list();
  for (Iterator iterator = courses.iterator(); iterator.hasNext();)
  {
   Course course = (Course) iterator.next();
   System.out.println(course.getCourseName());
  }
  transaction.commit();
  return courses;
 } catch (HibernateException e) {
  transaction.rollback();
  e.printStackTrace();
  return null;
 } finally {
  session.close();
 }
}

public void updateCourse(Long courseId, String courseName)
{
 Session session = HibernateUtil.getSessionFactory().openSession();
 Transaction transaction = null;
 try {
  transaction = session.beginTransaction();
  Course course = (Course) session.get(Course.class, courseId);
  course.setCourseName(courseName);
  transaction.commit();
 } catch (HibernateException e) {
  transaction.rollback();
  e.printStackTrace();
 } finally {
  session.close();
 }
}

public void deleteCourse(Long courseId)
{
 Session session = HibernateUtil.getSessionFactory().openSession();
 Transaction transaction = null;
 try {
  transaction = session.beginTransaction();
  Course course = (Course) session.get(Course.class, courseId);
  session.delete(course);
  transaction.commit();
 } catch (HibernateException e) {
  transaction.rollback();
  e.printStackTrace();
 } finally {
  session.close();
 }
}

}


package com.snk.util;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;

public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
 try {
//   sessionFactory = new Configuration().configure().buildSessionFactory();//Default configuration
  sessionFactory =  new AnnotationConfiguration().configure().buildSessionFactory();//Annotation Configuration
 
 } catch (Throwable ex) {
  System.err.println("Initial SessionFactory creation failed." + ex);
  throw new ExceptionInInitializerError(ex);
 }
}

public static SessionFactory getSessionFactory() {
 return sessionFactory;
}
}

 hibernate-servlet
 
   index.jsp
 

 
   
   View
   View
   com.snk.frontend.View
 
 
   View
   /View