Updating an object

Here, we look at how to get a record from the database and update the same record to the database. The main goal is to get Employee#2 and update the first name, aarush, to aarush_updated.

How to do it…

Here, we are trying to update an employee object having id equals 2.

The SQL query executed to achieve the same result is as follows:

UPDATE employee SET firstName='aarush_updated' WHERE id=2;

Now, let's take a look at how to do the same using hibernate.

Code

Enter the following code to update an object of the employee type, where id is 2:

SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openSession();

/* Line 3 */ Employee employee = (Employee) session.get(Employee.class, new Long(2));

System.out.println("\nOld Employee...");
System.out.println(employee.toString());

session.getTransaction().begin();
/* Line 9 */ employee.setFirstName("aarush_updated");
/* Line 10 */ session.update(employee);
session.getTransaction().commit...