Example to create the Hibernate Application in Eclipse IDE

Here, we are going to create a simple example of hibernate application using eclipse IDE. For creating the first hibernate application in Eclipse IDE, we need to follow following steps:

  • Create the java project
  • Add jar files for hibernate
  • Create the Persistent class
  • Create the mapping file for Persistent class
  • Create the Configuration file
  • Create the class that retrieves or stores the persistent object
  • Run the application

Create the java project

Create the java project by File Menu - New - project - java project. Presently specify the project name e.g. firsthb then next - finish.

Add jar files for hibernate

To add the jar files Right click on your project - Build path - Add external archives. Presently select all the jar files as shown in the image given below then click open.

download the required jar file

Create the Persistent class

Here, we are creating the same persistent class which we have created in the previous topic. To create the persistent class, Right click on src - New - Class - specify the class with package name (e.g. com.javatportal.mypackage) - finish.

Employee.java

package com.javatportal.mypackage;

public class Employee {
private int id;
private String firstName,lastName;

public int getId() {
	return id;
}
public void setId(int id) {
	this.id = id;
}
public String getFirstName() {
	return firstName;
}
public void setFirstName(String firstName) {
	this.firstName = firstName;
}
public String getLastName() {
	return lastName;
}
public void setLastName(String lastName) {
	this.lastName = lastName;
}


}

Create the mapping file for Persistent class

Here, we are creating the same mapping file as created in the previous topic. To create the mapping file, Right click on src - new - file - specify the file name (e.g. employee.hbm.xml) - alright. It must be outside the package.

employee.hbm.xml


		
		<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-mapping PUBLIC
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

 <hibernate-mapping>
  <class name="com.javatportal.mypackage.Employee" table="emp2000">
    <id name="id">
     <generator class="assigned"></generator>
    </id>
          
    <property name="firstName"></property>
    <property name="lastName"></property>
          
  </class>
          
 </hibernate-mapping>
 

Create the Configuration file

The configuration file contains all the informations for the database such as connection url, driver_class, username, password etc. The hbm2ddl.auto property is used to create the table in the database automatically. We will have in-depth learning about Dialect class in next topics. To create the configuration file, right click on src - new - file. Presently specify the configuration file.

Create the class that retrieves or stores the persistent object: In this class, we are simply storing the employee object to the database.

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>
        <property name="hbm2ddl.auto">update</property>
        <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
        <property name="connection.username">system</property>
        <property name="connection.password">oracle</property>
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
    <mapping resource="employee.hbm.xml"/>
    </session-factory>

</hibernate-configuration>

Create the class that retrieves or stores the persistent object

package com.javatportal.mypackage;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class StoreData {
public static void main(String[] args) {
	
	//creating configuration object
	Configuration cfg=new Configuration();
	cfg.configure("hibernate.cfg.xml");//populates the data of the configuration file
	
	//creating seession factory object
	SessionFactory factory=cfg.buildSessionFactory();
	
	//creating session object
	Session session=factory.openSession();
	
	//creating transaction object
	Transaction t=session.beginTransaction();
		
	Employee e1=new Employee();
	e1.setId(201);
	e1.setFirstName("Mithilesh");
	e1.setLastName("kushwaha");
	
	session.persist(e1);//persisting the object
	
	t.commit();//transaction is committed
	session.close();
	
	System.out.println("successfully saved");
	
}
}