[fpc-devel] TCustomConnection - why?

[Michael Van Canneyt]

On Sat, 7 May 2005, Joost van der Sluis wrote:

> > > I think that the idea behind TCustomConnection is the same of
> > > TDBDatabase. So I would suggest to implement all connect/disconnect
> > > stuff from TCustomConnection to TDBDatabase, and remove
> > > TCustomConnection.
> > > 
> > > Or am I missing something?
> > 
> > You are. 
> > 
> > First, TCustomConnection is there for Delphi compatibility, 
> > so removing it would be a bad idea, it was put there to 
> > allow tools as InstantObjects to compile. 
> 
> Create an alias to TDBDatabase or rename TDBDatabase to
> TCustomConnection.
> 
> > Secondly, TDatabase can also simply be a directory (e.g. with 
> > Dbase files), so it does not need 'connect' functionality, 
> > which is why TCustomConnection is a descendent and not an alias.
> > TDatabase is (loosely said) something that binds various datasets 
> > together. TCustomConnection is for actual client/server things.
> > 
> > In this sense, e.g. TSQLConnection should be a descendent of 
> > TCustomConnection instead of TDatabase. But I didn't have time 
> > yet to discuss that with you.
> > (too busy with the 2.0 docs, which are now finished BTW, so 
> > you can start firing questions...)
> 
> There's a difference between TDatabase and TDBDatabase. Now it is:
> 
> TDatabase - TDBDatabase - TSQLConnection.
> 
> So I think that the idea behind TDBDatabase is the same as
> TCustomConnection.
> 
> (The TDBDatabase also has transactions and datasets assigned to it, so
> that if the TDBdatabase closes, all transactions and datasets are closed
> and such)

MMMMyes. In that case we should make TCustomConnection an alias for TDBDatabase.

Michael.