[fpc-devel] TCustomConnection - why?
Michael Van Canneyt
michael at freepascal.org
Sat May 7 16:04:40 CEST 2005
On Sat, 7 May 2005, Joost van der Sluis wrote:
> Hi all,
> Can someone explain to me why TCustomConnection is implemented? And
> where was it based on?
> In Delphi TCustomConnection is a child of TControl, not of TDatabase,
Of TComponent, actually.
> and is doesn't have EndTransaction and StartTransaction procedures.
> 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
> Or am I missing something?
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.
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...)
More information about the fpc-devel