Method parseDsqlMessage

src/jrd/PreparedStatement.cpp:411–459

void PreparedStatement::parseDsqlMessage(const dsql_msg* dsqlMsg, Array<dsc>& values,
	MsgMetadata* msgMetadata, UCharBuffer& msg)
{
	// hvlad: Parameters in dsqlMsg->msg_parameters almost always linked in descending
	// order by par_index. The only known exception is EXECUTE BLOCK statement.
	// To generate correct metadata we must walk params in ascending par_index order.
	// So store all params in array in an ascending par_index order despite of
	// order in linked list.
	// ASF: Input parameters don't come necessarily in ascending or descending order,
	// so I changed the code to use a SortedArray.
	// AP: removed assertions for correct parameters order - useless with SortedArray.

	SortedArray<const dsql_par*, InlineStorage<const dsql_par*, 16>, const dsql_par*,
		DefaultKeyValue<const dsql_par*>, ParamCmp> params;

	for (FB_SIZE_T i = 0; i < dsqlMsg->msg_parameters.getCount(); ++i)
	{
		dsql_par* par = dsqlMsg->msg_parameters[i];
		if (par->par_index)
			params.add(par);
	}

	FB_SIZE_T paramCount = params.getCount();
	values.resize(paramCount * 2);
	msgMetadata->setItemsCount(paramCount);

	for (FB_SIZE_T i = 0; i < paramCount; ++i)
		dscToMetaItem(&params[i]->par_desc, msgMetadata->getItem(i));

	msgMetadata->makeOffsets();
	msg.resize(msgMetadata->getMessageLength());

	dsc* value = values.begin();

	for (FB_SIZE_T i = 0; i < paramCount; ++i)
	{
		// value
		*value = params[i]->par_desc;
		value->dsc_address = msg.begin() + msgMetadata->getItem(i).offset;
		++value;

		// NULL indicator
		value->makeShort(0);
		value->dsc_address = msg.begin() + msgMetadata->getItem(i).nullInd;
		// set NULL indicator value
		*((SSHORT*) value->dsc_address) = -1;
		++value;
	}
}


}	// namespace