I know this is old and I appologize if this is now long forgotten on your
end.
Would you please revisit this and let me know more about what it is that is
not to your liking. I wish I was more of an expert on these providers but
I'm not.

Thanks,
Jason Wharton

----- Original Message -----
From: "Jeroen W. Pluimers (mailings)" <jeroen.mailings@...>
To: <IBObjects@yahoogroups.com>
Sent: Wednesday, August 29, 2001 11:44 PM
Subject: [IBO] IBO 3.6 (probably also IBO4): PSReset question


>
> This is the current implementation of TIBODataSet.PSReset:
>
> procedure TIBODataSet.PSReset;
> begin
> inherited PSReset;
> if Active then
> begin
> Close;
> Open;
> end;
> end;
>
> I'm wondering why it is implemented like this, and if there could be an
> implementation that does not perform a Close/Open.
>
> The reason has to do with a TClientDataSet and TDataSetProvider bound to a
> TIBODataSet:
>
> The TDataSourceProvider to bound to a TIBODataSet.
> The TClientDataSet is bound to the TDataSetProvider.
>
> An obvious way to Open/Close the TClientDataSet is in the
> AfterOpen/BeforeClose events of the TIBODataSet.
> This causes the following sequence of events:
>
> 1. TIBODataSet is opened and calls the AfterOpen event.
> 2. The AfterOpen event tries to open the TClientDataSet
> 3. The TClientDataSet fetches the records through the TDataSetProvider
> 4. The TDataSetProvider fetches the data from the TIBODataSet
> 5. The TDataSetProvider finally calls IProviderSupport(DataSet).PSReset,
> which in turn calls TIBODataSet.PSReset.
> 6. TIBODataSet.PSReset calls Close, and the BeforeClose event
> 7. The BeforeClose event calles TClientDataSet.Close
> 8. TIBODataSet.PSReset calls Open, and the AfterOpen event
> 9. we return at step 2 in an endless loop.
>
> This TClientDataSet specific issue is about the only place where you can't
> use AfterOpen/BeforeClose to manage depending datasets (it works fine with
> master-detail relations and other dependencies), so I would appreciate if
> PSReset could be reimplemented somehow.
>
> --
> Jeroen W. Pluimers
> Consultant at All I M
> http://www.all-im.com
>
>
>
>
>
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>
>