Method openCursor

src/jrd/jrd.cpp:5117–5169

JResultSet* JStatement::openCursor(CheckStatusWrapper* user_status, ITransaction* transaction,
	IMessageMetadata* inMetadata, void* inBuffer, IMessageMetadata* outMetadata, unsigned int flags)
{
	JResultSet* rs = NULL;

	try
	{
		JTransaction* jt = transaction ? getAttachment()->getTransactionInterface(user_status, transaction) : NULL;

		EngineContextHolder tdbb(user_status, this, FB_FUNCTION);

		jrd_tra* tra = jt ? jt->getHandle() : NULL;

		if (tra)
			validateHandle(tdbb, tra);

		check_database(tdbb);

		try
		{
			RefPtr<IMessageMetadata> defaultOut;
			if (!outMetadata)
			{
				defaultOut.assignRefNoIncr(metadata.getOutputMetadata());
				if (defaultOut)
				{
					outMetadata = defaultOut;
				}
			}

			const auto cursor = getHandle()->openCursor(tdbb, &tra,
				inMetadata, static_cast<UCHAR*>(inBuffer), outMetadata, flags);

			rs = FB_NEW JResultSet(cursor, this);
			rs->addRef();
			cursor->setInterfacePtr(rs);
		}
		catch (const Exception& ex)
		{
			transliterateException(tdbb, ex, user_status, "JStatement::openCursor");
			return NULL;
		}
		trace_warning(tdbb, user_status, "JStatement::openCursor");
	}
	catch (const Exception& ex)
	{
		ex.stuffException(user_status);
		return NULL;
	}

	successful_completion(user_status);
	return rs;
}


IResultSet* JAttachment::openCursor(CheckStatusWrapper* user_status, ITransaction* apiTra,