----- Original Message -----
From: "Helen Borrie" <helebor@...>
To: <IBObjects@yahoogroups.com>
Sent: Friday, August 15, 2003 3:12 PM
Subject: Re: [IBO] How to clean up resources at closing program ?


> At 02:46 PM 15/08/2003 +0200, you wrote:
> >Thanks for your answer, Helen
> >
> >One more question about this:
> >
> > > When the connection shutdown sequence calls the Close() method of each
> > > transaction, each transaction's linked statement objects get cleaned
> > > up. In the case of some datasets, there might be a delay if there are
> > > unfetched rows, because the dataset object will deal with them first.
> > > If you don't call Connection.Disconnect explicitly, it will be done by
the
> > > connection's owner.
> >
> >Does the above imply that I should only use
> >
> >Transaction.Close
> >
> >not followed by
> >
> >Connection.Disconnect
> >
> >because the Close method has already taken care for that ?
>
> No, in a clean application, the opposite. Connection.Disconnect will
> ensure that the transactions associated with it will be made to do their
> cleanup. Connection.Disconnect will ultimately get called by the owner of
> the connection, anyway.
>
> Really, the main cleanup thing you have to be concerned about is a matter
> of good Delphi practice, rather than anything you specifically have to do
> "because it's IBO". Don't have destructors calling destructors for
objects
> that own other objects which have complex dependencies that might mess up
> references in unforeseen ways. When people do that sort of thing in an
> untidy fashion, we'll typically see a panic list message with the Subject
> "Application AVs on exit". Those mistakes can be really hard to
troubleshoot.
>
> This is a propos one part of your question, which was about having query
> objects located on a different form to the connection object. This is just
> fine as long as you keep to the basic Delphi rules of ensuring that
objects
> are always able to destroy their own creations without interference.
>
> Helen
>
>
>
>
>
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