isqltcl is the Informix SQL db extension to Tcl (Kumar)
An extension for adding SQL support in Tcl and full blown support for INFORMIX in Tcl/Tk. Now at version 3.3. A windowing version of isql, based on the WISQL package (which requires tclX) is also available. Modifications to upgrade this to work with Informix v7.23 and Tcl 8.x are available from Andy Lennard , andy at kontron.demon.co.uk