EntityManager.beginTransaction

klyn.data.EntityManager.beginTransaction

method

public beginTransaction() as EntityTransaction:

Description

Begins the transaction bound to this manager's provider session.

A manager owns one transaction coordinator. Calling this method while that transaction is active raises an exception rather than creating a second transaction over the same provider session.

Returns

Active transaction used to commit or roll back provider work.

Throws

EntityManagerClosedException when this manager is closed.
TransactionException when a transaction is already active or the provider cannot start one.
ProviderCapabilityException when the provider has no transaction support.

Example

transaction = manager.beginTransaction()
try:
manager.persist(user)
transaction.commit()
catch error as Exception:
if transaction.active:
transaction.rollback()
throw error