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Software Architecture in Java: Design & Development

Develop the Data Access Tier

Explore how to develop the data access tier in Java applications using Hibernate. Learn to implement create, read, update, and delete operations through test-driven examples, mastering the use of Session.save, Session.get, Session.delete, and Session.merge methods to manage database interactions effectively.

We'll cover the following...

“Find all records” operation

We will begin with the test case for the “find all records” operation.

Java
@RunWith( SpringJUnit4ClassRunner.class )

@ContextConfiguration( locations = { "classpath:context.xml" } )

@TransactionConfiguration( defaultRollback = true )

@Transactional

public class EmployeeDaoImplTest {

	@Autowired

	private EmployeeDao dao ;



	@Test

	public void testGetAll() {

		Assert.assertEquals(0L, dao.getAll().size());

    }

}

We will then see how to write the corresponding data access operation of the above test.

Java
@Repository

@Transactional

public class EmployeeDaoImpl  implements EmployeeDao {

	@Autowired

	private SessionFactory sessionFactory ;



	@SuppressWarnings("unchecked")

	@Override

	public List<Employee> getAll() {

		return sessionFactory.getCurrentSession().createQuery("select employee from Employee employee order by employee.id desc").list();

	} 

}

Insert operation

Let’s ...