Hello i2dx, 
I downloaded your ADO-toolkit (version 1.7.0.b) but found that it doesn't work very well with your own examples.  For instance, in example 2, I would get a "Exception occured in Microsoft OLE DB Provider for ODBC Drivers" error.  I had to add a decrement-by-1 into the For loop of case structure '2' in ADOTool_Select Data Simple.vi to fix that.  In example 2 and 3, even though the select statement asks for all three fields, only the data from two would show up.  In example 4 and 5, I'm getting another "Exception occured in Microsoft OLE DB Provider for ODBC Drivers" but I don't have the time to troubleshoot further.   
Do you have a working version of your toolkit? 
Thanks, 
Ron 
I should add that I think your toolkit would be very handy. 
I should add that I think your toolkit would be very handy.