[snichols] I've written yet another ODBC extension for Tcl and have tested it extensively on Windows using SQL Server 7 and SQL Server 2000. However, it should be able to work with Oracle, Access, etc. The original version was written a few years ago. I took a college course on C/C++ and wanted to apply what I had learned, and thought this would be something fun to program. At work I mostly program in Tcl and VB and do not get much of an opportunity to program in C or C++. Recently, I added a few new Tcl commands to expose more C sytle ODBC methods to Tcl. I know there's a much more popular ODBC extension alreadt available: TclODBC. At the time when I wrote this, I didn't even know there was already another flavor of Tcl ODBC available until after I programmed it and posted it to sourceforge. When I wrote this extension I was still fairly new to Tcl and did not know about making an extension feel Tclish. If anyone is interested in this extension then I can update the extension to be more Tclish. 
Who knows maybe it has some useful feature that's not in other Tcl extensions even though its not too Tclish? Some other extensions that expose ODBC that I know of are TclODBC and tcom (through ADO).

FYI..I've tested it with Tcl Threads and it seems stable in those too. The only gotcha I know is to make sure this runs in a different Tcl Thread then Tdom. The more popular ODBC Tcl extension TclODBC is much more Tclish', but please let me know what you think of this one.

The project files and the Windows compiled library (DLL) can be downloaded from SourceForge.net at the following link. 

https://sourceforge.net/projects/tclsql/

I have included the sources, and directions in the zipped file if you wish to review them.

Also, I've included a sample Win32 Tk application under TclSQL 1.2 file releases of a Tcl kit file and starpack of how the extension might be used. It's called DBTool.kit and DBTool.exe. It allows a user to make changes to already existing SQL tables: insert rows, add rows, alter fields, etc. using Tktable. It seems to work fine with SQL Server 7 and 2000. It should work with other DB's too, but the SQL update query in the Tcl source may have to be updated. The Tcl sources also show how to embed widgets into cells so a user does not fat finger a critical DB field.

I was going to put the the extension reference below, but its included in the download anyway. Please let me know what you think of the extension and dbtool.kit package.