why we use merge option in hybernate pls give a ex snippet

Question Posted / krishnamurthy

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why we use merge option in hybernate pls give a ex snippet ..

Answer / Anuj Kumar Singh

The 'merge' operation in Hibernate is used to combine the state of an object with the database state. This can be useful when you have an object that was detached from the Session and want to update its database representation without executing a full save or update query. Here's a simple example:

// Detach the object from the session
Session session = factory.openSession();
Transaction transaction = session.beginTransaction();
User user = (User) session.get(User.class, userId);
session.detach(user);
transaction.commit();
session.close();

// Merge the object back into the session and save its changes
Session mergedSession = factory.openSession();
Transaction mergedTransaction = mergedSession.beginTransaction();
User updatedUser = (User) mergedSession.merge(user);
mergedTransaction.commit();
mergedSession.close();

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