As was mentioned in a previous thread, you cannot mix the old SQL Toolkit VIs with the Database Connectivity Toolkit VIs. They use completely different methods of communicating to databases and their refnums are incompatible.
There is an entire section of the ReadMe file devoted to this very topic. You can use the Compatibility VIs if you really insist on using the old toolkit. Otherwise, update to the current one.
Both the user manual and the readme file for the Database Toolkit describe the compatibility VIs for the old toolkit as well as talk about the new toolkit and examples.
As far as what "compatibility VIs" are -- whenever NI obsoletes a technology and replaces it with something else, we don't want to just break all the existing code out there. So a library of "compatibility VIs" will be available for a few versions that look like, behave, and have the same connector panes as the obsoleted technology. However, inside the compatibility diagrams, the current technology is used.