Transaction:
A transaction is a sequence of operation which works as an atomic unit. A transaction only completes if all the operations completed successfully. A transaction has the Atomicity, Consistency, Isolation and Durability properties (ACID).
Transaction interface:
Transaction interface provides the facility to define the units of work or transactions. A transaction is associated with a session. We have to call beginTransaction()method of Session to start a transaction (Session.beginTransaction()).
Commonly used methods of Transaction interface:
1. begin(): It starts a new transaction. Syntax:
public void begin() throws HibernateException
2. commit(): It ends the transaction and flush the associated session. Syntax:
public void commit() throws HibernateException
3. rollback(): It roll back the current transaction. Syntax:
public void rollback()throws HibernateException
4. setTimeout(int seconds): It set the transaction timeout for any transaction started by a subsequent call to begin() on this instance. Syntax:
public void setTimeout(int seconds) throws HibernateException
5. isActive(): It checks that is this transaction still active or not. Syntax:
public boolean isActive()throws HibernateException
6. wasRolledBack(): It checks that is this transaction roll backed successfully or not. Syntax:
public boolean wasRolledBack()throws HibernateException
7. wasCommitted():It checks that is this transaction committed successfully or not. Syntax:
public boolean wasCommitted()throws HibernateException
8. registerSynchronization(Synchronization synchronization): It register a user synchronization callback for this transaction. Syntax:
public boolean registerSynchronization(Synchronization synchronization)throws HibernateException
Example:
Transaction tx = null; //Get the session object. Session session = HibernateUtil.getSessionFactory().openSession(); try{ tx = session.beginTransaction(); //Perform some operation here tx.commit(); }catch (HibernateException e) { if(tx!=null){ tx.rollback(); } e.printStackTrace(); }finally { session.close(); } |
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