experimental support for Tdbc in DIO

[Massimo Manghi <ma...@unipr.it>]

I started an experimental dio_Tdbc.tcl class in trunk (a stub has been
just committed).

This class is meant to be a transition tool for applications needing to
migrate from DIO to Tdbc removing the need to require both tdbc and
another DB specific driver. Personally I became so familiar with some
DIO methods and constructs that having it around is somewhat a
simplification when doing many fundamental queries, still tdbc offers
many interesting feature and having access to it is helpful.

Trying to write the concrete methods of class Tdbc I realized there is
no support in tdbc for querying the current value of a primary key after
a insert query has run (method lastkey in classes Mysql and Postgres).
Reproducing these same methods implies must be aware of the backend thus
breaking the class abstraction.

Suggestions?

-- 
-- Massimo Manghi

Dipartimento di Neuroscienze
Unità di Biofisica e Fisica Medica
via Volturno 39
43125 Parma

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