Hibernate Framework Hibernate Transactions 1

Question 1

How do you begin a transaction in Hibernate using the Session API?

Accepted Answer

session.beginTransaction()

Answer

The beginTransaction() method on a Hibernate Session starts a new database transaction and returns a Transaction object.

Question 2

What happens if you call session.flush() inside a transaction?

Accepted Answer

Hibernate synchronizes in-memory state with the database without committing

Answer

flush() forces Hibernate to execute pending SQL statements to synchronize the persistence context with the database, but the transaction remains open.

Question 3

What does transaction.commit() do in Hibernate?

Accepted Answer

Makes all changes permanent in the database and ends the transaction

Answer

commit() flushes the session if needed and then permanently saves all changes to the database, ending the current transaction.

Question 4

What is the role of transaction.rollback() in Hibernate?

Accepted Answer

Undoes all changes made since the transaction began

Answer

rollback() reverses all database changes made within the current transaction, returning the database to its state before the transaction started.

Question 5

What is optimistic locking in Hibernate?

Accepted Answer

Assumes no conflict and checks version at commit time

Answer

Optimistic locking assumes concurrent modifications are rare and only checks for conflicts at commit time using a version field.

Hibernate Framework Practice Test

Hibernate Framework Practice Test

Hibernate Framework Hibernate Transactions 1