hibernateexample.java

hibernate application

package com.myeclipse.hibernate;

import org.hibernate.Transaction;

public class HibernateExample {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// 1. Add the new user
		addUser();
		
		// 2. Retrieve the user and print it
		listUser();
		
		// 3. Change the user record and update it
		changeUser();
	}
	
	private static void addUser() {
		// 1. Create user
		User user = new User();
		user.setId(1);
		user.setUsername("jdoe");
		user.setPassword("1234");
		user.setFirstName("John");
		user.setLastName("Doe");
		user.setDateCreated(System.currentTimeMillis());
		
		// 2. Create DAO
		UserDAO dao = new UserDAO();
		
		// 3. Start the transaction
		Transaction tx = dao.getSession().beginTransaction();
		
		// 4. Add user
		dao.save(user);
		
		// 5. Commit the transaction (write to database)
		tx.commit();
		
		// 6. Close the session (cleanup connections)
		dao.getSession().close();
	}
	
	private static void listUser() {
		// 1. Create DAO
		UserDAO dao = new UserDAO();
		
		// 2. Find user by ID
		User user = dao.findById(1);
		
		// 3. Print the user information out
		printUser("Printing User, ", user);
		
		// 4. Close the session (cleanup connections)
		dao.getSession().close();
	}
	
	private static void changeUser() {
		// 1. Create DAO
		UserDAO dao = new UserDAO();
		
		// 2. Find user by ID
		User user = dao.findById(1);
		
		// 3. Change user information
		user.setUsername("jsmith");
		user.setPassword("abcd");
		user.setFirstName("Jane");
		user.setLastName("Smith");
		
		// 4. Start the transaction
		Transaction tx = dao.getSession().beginTransaction();
		
		// 5. Update the user record with the changes
		dao.save(user);
		
		// 6. Commit the transaction (write to database)
		tx.commit();
		
		// 7. Load the updated user from the database
		User updatedUser = dao.findById(1);
		
		// 8. Print the updated user information out to confirm the changes
		printUser("Printing Updated User, ", updatedUser);
		
		// 9. Close the session (cleanup connections)
		dao.getSession().close();
	}
	
	private static void printUser(String extraText, User user) {
		System.out.println(extraText 
							+ " User[Username: " 
							+ user.getUsername() 
							+ ", Password: " 
							+ user.getPassword() 
							+ ", First Name: " 
							+ user.getFirstName() 
							+ ", Last Name: " 
							+ user.getLastName() + "]");
	}

}