Hibernate Many to One Update Operation

// For SQL and POJO see the Many to One Insert Operation : Here
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class HibernateEngine {

public static void main(String[] javaWorld)
{

System.out.println(" ....... ENGINE START ............");
System.out.println(" .. MANY TO ONE ANNOTATION UPDATE LESSON ..");

Configuration condigurationObj = new Configuration();
condigurationObj.configure("hibernate.cfg.xml");
SessionFactory factoryObj = condigurationObj. buildSessionFactory ();
Session sessionObj = factoryObj.openSession();

Children childObj = (Children) sessionObj.get(Children.class, new Integer(1));
childObj.setName("Nandni");
childObj.setAge(20);

/* In below two line we are changing the already exist parent name*/
Parent parentObj = childObj.getParentObj();
parentObj.setName("Divya");
/* Using below three line we can add a new parent for the existing child */
/*
Parent newParentObj = new Parent();
newParentObj.setName("Viral");
childObj.setParentObj(newParentObj);
*/

Transaction transactionObj=sessionObj.beginTransaction();
sessionObj.update(childObj);
transactionObj.commit();

System.out.println("\n....... DATA UPDATED SUCCESSFULLY ..........");
sessionObj.close();
factoryObj.close();
System.out.println("....... ENGINE STOP ..........");

}
}