Transaction is nothing but a unit of work. It is described by four properties: ACID
Atomicity
Consistency
Isolation
Durability
A database transaction has to be as short as possible as it is associated with one Session.
It is instantiated by calling session.beginTransaction().
Sample program for transaction management:
Session session = null;
Transaction tx = null;
try{
session = sessionFactory.openSession();
tx = session.beginTransaction();
tx.setTimeout(3); //transaction time out of 3 sec
//doSomething(session);
tx.commit();
}catch(Exception e){
tx.rollback(); // whenever exception occur we should rollback
//the transaction to maintain atomicity
}
finally {
session.close();
}