How does one check for null or an empty result set with MySQL C++ connector?

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C++

MySQL

MySQL-Connector

In the following code, the intention is to check for null or empty result set , but I keep getting an excepton thrown.

pstmt = con->prepareStatement("SELECT id FROM test ORDER BY id ASC");
  res = pstmt->executeQuery();
  res->next();
  if(res->isNull(1))
  {
	  cout << " In null";
  }
  else
  {
	  cout << " Is not Null";
  }

How does one test for null or empty result set?