Hibernate example

package com.journaldev.hibernate.main;
 
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
 
import com.journaldev.hibernate.model.Address;
import com.journaldev.hibernate.model.Employee;
import com.journaldev.hibernate.util.HibernateUtil;
 
public class HibernateSaveExample {
 
    public static void main(String[] args) {
         
        // Prep Work
        SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
         
        //save example - without transaction
        Session session = sessionFactory.openSession();
        Employee emp = getTestEmployee();
        long id = (Long) session.save(emp);
        System.out.println("1. Employee save called without transaction, id="+id);
        session.flush(); //address will not get saved without this
        System.out.println("*****");
         
        //save example - with transaction
        Transaction tx1 = session.beginTransaction();
        Session session1 = sessionFactory.openSession();
        Employee emp1 = getTestEmployee();
        long id1 = (Long) session1.save(emp1);
        System.out.println("2. Employee save called with transaction, id="+id1);
        System.out.println("3. Before committing save transaction");
        tx1.commit();
        System.out.println("4. After committing save transaction");
        System.out.println("*****");
         
        //save example - existing row in table
        Session session6 = sessionFactory.openSession();
        Transaction tx6 = session6.beginTransaction();
        Employee emp6 =  (Employee) session6.load(Employee.class, new Long(20));
         
        //update some data
        System.out.println("Employee Details="+emp6);
        emp6.setName("New Name");
        emp6.getAddress().setCity("New City");
         
        long id6 = (Long) session6.save(emp6);
        emp6.setName("New Name1"); // will get updated in database
        System.out.println("5. Employee save called with transaction, id="+id6);
        System.out.println("6. Before committing save transaction");
        tx6.commit();
        System.out.println("7. After committing save transaction");
        System.out.println("*****");
         
        // Close resources
        sessionFactory.close();
 
    }
 
    public static Employee getTestEmployee() {
        Employee emp = new Employee();
        Address add = new Address();
        emp.setName("Test Emp");
        emp.setSalary(1000);
        add.setAddressLine1("Test address1");
        add.setCity("Test City");
        add.setZipcode("12121");
        emp.setAddress(add);
        add.setEmployee(emp);
        return emp;
    }
}

http://www.journaldev.com/3481/hibernate-save-vs-saveorupdate-vs-persist-vs-merge-vs-update-explanation-with-examples