@Override
public void saveEventDetails(Event event) {
// TODO Auto-generated method stub
// Opening a session to create a database connection
Session session = this.sessionFactory.openSession();
// for CRUD operations, we need to create a transaction
Transaction tx = null;
// adding a try catch block for maintaining the atomicity of transaction
try {
tx = session.beginTransaction();
System.out.println("DbHelper..saveEventDetails");
// session save inserts the object into DB
session.save(event);
tx.commit();
System.out.println("Event saved");
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
}
public void saveEvent(Event event) {
Event event1 = getEvent(event);
Session session = SessionFactoryUtil.getInstance().getCurrentSession();
try {
if (event1 == null) {
Transaction transaction = session.beginTransaction();
try {
session.save(event);
transaction.commit();
} catch (HibernateException e) {
transaction.rollback();
e.printStackTrace();
}
} else {
Transaction transaction = session.beginTransaction();
try {
session.update(event);
transaction.commit();
} catch (HibernateException e) {
transaction.rollback();
e.printStackTrace();
}
}
} finally {
if (session.isOpen()) {
session.flush();
session.disconnect();
session.close();
}
}
}
private Long createAndStorePerson(String firstname, String lastname) {
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
Person thePerson = new Person();
thePerson.setFirstname(firstname);
thePerson.setLastname(lastname);
session.save(thePerson);
session.getTransaction().commit();
return thePerson.getId();
}
private Long createAndStoreEvent(String title, Date theDate) {
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
Event theEvent = new Event();
theEvent.setTitle(title);
theEvent.setDate(theDate);
session.save(theEvent);
session.getTransaction().commit();
return theEvent.getId();
}
public void runHibernate() {
// ############################################################################
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction tx = session.beginTransaction();
Message message = new Message("Hello World");
session.save(message);
tx.commit();
session.close();
// ############################################################################
Session secondSession = HibernateUtil.getSessionFactory().openSession();
Transaction secondTransaction = secondSession.beginTransaction();
List messages = secondSession.createQuery("from Message m order by m.text asc").list();
System.out.println(messages.size() + " message(s) found:");
for (Iterator iter = messages.iterator(); iter.hasNext(); ) {
Message loadedMsg = (Message) iter.next();
System.out.println(loadedMsg.getText());
}
secondTransaction.commit();
secondSession.close();
// ############################################################################
Session thirdSession = HibernateUtil.getSessionFactory().openSession();
Transaction thirdTransaction = thirdSession.beginTransaction();
// message.getId() holds the identifier value of the first message
Message loadedMessage = (Message) thirdSession.get(Message.class, message.getId());
loadedMessage.setText("Greetings Earthling");
loadedMessage.setNextMessage(new Message("Take me to your leader (please)"));
thirdTransaction.commit();
thirdSession.close();
// ############################################################################
// Final unit of work (just repeat the query)
// TODO: You can move this query into the thirdSession before the
// commit, makes more sense!
Session fourthSession = HibernateUtil.getSessionFactory().openSession();
Transaction fourthTransaction = fourthSession.beginTransaction();
messages = fourthSession.createQuery("from Message m order by m.text asc").list();
System.out.println(messages.size() + " message(s) found:");
for (Iterator iter = messages.iterator(); iter.hasNext(); ) {
Message loadedMsg = (Message) iter.next();
System.out.println(loadedMsg.getText());
}
fourthTransaction.commit();
fourthSession.close();
// Shutting down the application
HibernateUtil.shutdown();
}
@Override
public void saveUserTopic(UserTopic userTopic) {
Session session = this.sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
session.save(userTopic);
tx.commit();
// System.out.println("Forum Committed..")
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
}
@Override
public void savePostDetails(Post post) {
// TODO Auto-generated method stub
Session session = this.sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
session.save(post);
tx.commit();
// System.out.println("Post Committed..");
} catch (HibernateException e) {
if (tx != null) {
tx.rollback();
e.printStackTrace();
}
} finally {
session.close();
}
}
