Method startTransaction

src/jrd/jrd.cpp:4703–4745

JTransaction* JAttachment::startTransaction(CheckStatusWrapper* user_status,
	unsigned int tpbLength, const unsigned char* tpb)
{
/**************************************
 *
 *	g d s _ $ s t a r t _ t r a n s a c t i o n
 *
 **************************************
 *
 * Functional description
 *	Start a transaction.
 *
 **************************************/
	jrd_tra* tra = NULL;

	try
	{
		EngineContextHolder tdbb(user_status, this, FB_FUNCTION);
		check_database(tdbb);

		start_transaction(tdbb, true, &tra, getHandle(), tpbLength, tpb);
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return NULL;
	}

	successful_completion(user_status);

	JTransaction* jt = tra->getInterface(false);

	if (jt)
		tra->tra_flags &= ~TRA_own_interface;
	else
	{
		jt = FB_NEW JTransaction(tra, getStable());
		tra->setInterface(jt);
		jt->addRef();
	}

	return jt;
}


void JAttachment::transactRequest(CheckStatusWrapper* user_status, ITransaction* tra,