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PersonService
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| package org.krams.tutorial.service; import java.util.List; import javax.annotation.Resource; import org.apache.log4j.Logger; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.krams.tutorial.domain.Person; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; /** * Service for processing Persons * */ @Service("personService") @Transactional public class PersonService { protected static Logger logger = Logger.getLogger("service"); @Resource(name="sessionFactory") private SessionFactory sessionFactory; /** * Retrieves all persons * * @return a list of persons */ public List<person> getAll() { logger.debug("Retrieving all persons"); // Retrieve session from Hibernate Session session = sessionFactory.getCurrentSession(); // Create a Hibernate query (HQL) Query query = session.createQuery("FROM Person"); // Retrieve all return query.list(); } /** * Retrieves a single person */ public Person get( Integer id ) { // Retrieve session from Hibernate Session session = sessionFactory.getCurrentSession(); // Retrieve existing person first Person person = (Person) session.get(Person.class, id); return person; } /** * Adds a new person */ public void add(Person person) { logger.debug("Adding new person"); // Retrieve session from Hibernate Session session = sessionFactory.getCurrentSession(); // Save session.save(person); } /** * Deletes an existing person * @param id the id of the existing person */ public void delete(Integer id) { logger.debug("Deleting existing person"); // Retrieve session from Hibernate Session session = sessionFactory.getCurrentSession(); // Retrieve existing person first Person person = (Person) session.get(Person.class, id); // Delete session.delete(person); } /** * Edits an existing person */ public void edit(Person person) { logger.debug("Editing existing person"); // Retrieve session from Hibernate Session session = sessionFactory.getCurrentSession(); // Retrieve existing person via id Person existingPerson = (Person) session.get(Person.class, person.getId()); // Assign updated values to this person existingPerson.setFirstName(person.getFirstName()); existingPerson.setLastName(existingPerson.getLastName()); existingPerson.setMoney(existingPerson.getMoney()); // Save updates session.save(existingPerson); } }</person> |
We've declared a simple CRUD system with the following methods:
getAll()
add()
delete()
edit()
In each method we retrieve the session:
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This is similar to retrieving a connection from the database so that we can do our work. The Sessionobject provides numerous methods for persisting objects. For this tutorial, we use the following Session methods:
session.createQuery()
session.save()
session.delete()
We're done with the domain and the service layer. Let's move to the Spring controller.
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