Hibernate 4 Hello World example in Eclipse using XML Mapping

 
This is the 4th article on Hibernate in java application that describes on how to to save an object from java into the database using Hibernate 4(Hibernate 4 Insert Query). If you have not read my previous articles article on Generic Hibernate Application Requirements (XML Mapping) and Steps to be followed to use Hibernate in Java, I will recommend that you read that article first. You may want to look at Hibernate Installation/Setup on Eclipse IDE article if Hibernate is not installed already on your system.
 
As described earlier, the following files are the minimum requirement to shape an hibernate program..

Student.java (Model class)
Student.hbm.xml  (Xml mapping file )
hibernate.cfg.xml  (Xml configuration file)
HibernateUtil.java (Main class to write hibernate logic)

Project Structure

Model class

 
Example:Student.java
 

package model;

public class Student {
	private int id;
	private String name;
	private String department;
	private String college;

// Create Getters and Setters
}

Hibernate Mapping file for Model Class

 
Now Create a new XML file(Student.hbm.xml) which is our mapping file related to above model class and place it in the src directory of your project.
 
Student.hbm.xml : A simple hibernate XML mapping
 

 
Note: I have explained about each and every element used in the above file in the article Generic Hibernate Application Requirements
 

Hibernate Configuration file

 
Create a new XML file and give this new configuration file the default name hibernate.cfg.xmland place it src directory of your project.
 
File: hibernate.cfg.xml

   
   oracle.jdbc.driver.OracleDriver
   system
   admin
   jdbc:oracle:thin:@127.0.0.1:1521:XE

   
   org.hibernate.dialect.Oracle10gDialect

   
   true

   
   create
   
   

Hibernate Utility

 
Create the Main class to run the example.
 

package util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

import model.Student;

public class HibernateUtil {

	public static void main(String[] args) {

		Configuration cf = new Configuration().configure("hibernate.cfg.xml");

		StandardServiceRegistryBuilder srb = new StandardServiceRegistryBuilder();
		srb.applySettings(cf.getProperties());
		ServiceRegistry sr = srb.build();
		SessionFactory sf = cf.buildSessionFactory(sr);

		Session session = sf.openSession();
		Student std = new Student();
		std.setId(1);
		std.setName("Jamil");
		std.setDepartment("ECE");
		std.setCollege("SKCET");

		Transaction tx = session.beginTransaction();
		session.save(std);
		tx.commit();
		System.out.println("Object saved successfully.....!!");
		session.close();
		sf.close();
	}
}

 
In the article Steps to be followed to use Hibernate in Java, I have explained the configuration/code used in above program in detail.
 
Now once our project is ready. Right click to project or right click to HibernateUtil.java and click Run As–>Java Application. Since I have set show_sqlto truein hibernate.cfg.xml, so the hibernate create and insert quires will be displayed on eclipse console as below.
 

 
You will see the data stored in Student table in the database.
 

 
In my next article I have implemented Select Query in Hibernate