On 6/30/07, Lew <[EMAIL PROTECTED]> wrote: > Depends on what you're taking. > Ted's right about buffering and rollbacks, but I think you were referring to > a different concept. Namely that > the logic governing which tables to update and when doesn't belong in the > user interface, it belongs in a > business layer with actual storage issues governed by the data layer. I don't > feel that this is an object > engineering issue so much as a question of how strictly we layer our code and > how much of the labor saving > features .. in this case the ControlSource property... in VFP we're willing > to give up to achieve the > perfectly tiered and engineered app. > -Lew >
Interesting "view" of the situation, excusing the pun. I see the buffered data as an interface between the user interface and the business objects. The UI can mess with the buffered data all it wants, but it is only when the UI passes a message to the business objects and the business objects do whatever validation or processes they might and then invoke the data methods to save the data. The business objects may choose to revert buffered data or ignore changes that don't go to the back end. Then, they pass the names of the cursor they think should be updated to the data layer, which can use all the great VFP data functions like GetNextModified() and GetFldState() to figure out what data needs updating, and then send the SQl to the backend, using SPT or views or CursorAdaptors. How hard is that? Nothing that ten or twelve man-years of effort can't refine ;) -- Ted Roche Ted Roche & Associates, LLC http://www.tedroche.com _______________________________________________ Post Messages to: ProFox@leafe.com Subscription Maintenance: http://leafe.com/mailman/listinfo/profox OT-free version of this list: http://leafe.com/mailman/listinfo/profoxtech Searchable Archive: http://leafe.com/archives/search/profox This message: http://leafe.com/archives/byMID/profox/[EMAIL PROTECTED] ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.
