Windchill 事務的開啓與關閉

public void save() throws POMInitException, PersistenceException{
		Transaction tx = null;
		try {
			//判斷上下文是有活動的事務
			if (!PersistentObjectManager.getPom().isTransactionActive()) {
				tx = new Transaction();
			}
			if (tx != null) {
				tx.start();
			}
			
			if (tx != null) {
				tx.commit();
			}
		} finally {
			if (tx != null) {
				tx.rollback();
			}
		}
	}