public QueryResult addToQueryResult(QueryResult qrTo, QueryResult qrFrom) throws XWException, SQLException {
QueryResult result = null;
if (qrTo != null && qrFrom != null) {
result = addToQueryResult(connection, theDb, qrTo, qrFrom, null);
} else {
throw new XWException("QueryResult must not be null");
}
return result;
}