RE: [flexcoders] FDS Data Management quesion

[Jeff Vroom]

First off, a bit about how FDMS works behind the scenes.  As you change a property of an object, a PropertyChangedEvent is fired which tells FDMS of the change.  A message is logged for the item indicating that the property is changed.  If you change a second property on the object, we merge that property change event into to the first message.  If autoCommit is false, when you call “commit”, all pending changes are sent.  So if you are not changing an item, nothing is sent but if you have changed items A and B and the changes were logged for these items, there is no way to just commit the changes for item B.  You can individually revert changes made to items however but that will roll the state of the item back to its state before the change.     Now it is possible to release an item so that FDMS is no longer managing its state.  At this point, FDMS will not be tracking changes to that item so you could call getItem on A and getItem on B, then releaseItem on A.  Now only changes to B will be tracked.   If you call fill and get a collection of objects, there is no way to release just a single item in the collection however.   Your use case is an interesting one and it would not be hard for us to add a method which just commits the changes to a specify item so I’ll add an enhancement for that.   As for your final question, merge is used when you have set autoMerge=false and it will merge changes received by the server into the current managed set of items.  As changes are received by a client for some set of managed items, by default they are automatically “merged” into the current versions of the items, but when you turn autoMerge=false, they are queued up instead (the mergeRequired property is set in this case).  At that point, you call “merge” to apply those changes.   Jeff   From: flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com] On Behalf Of thunderstumpgesatwork Sent: Tuesday, August 22, 2006 9:58 AM To: flexcoders@yahoogroups.com Subject: [flexcoders] FDS Data Management quesion   I have a question (or two) about saving/persisting/updating changes that have been made. I'm trying to maintain some granular level of control of which managed objects are saved and which are rolled back. First scenario: Assume we used dataservice.fill() to load a collection. Is it possible to save only one item in the collection? How would this be done? The only method I saw for updating (dataservice.commit()) says it updates all collections managed by this data service. Second scenario: Assume we decided to query each item individually using dataservice.getItem(), is it possible to save one item at a time? or to decide which item to save and which to roll back? Again, the commit() function seems to imply that all changes to all items are committed. And lastly, what is the difference between merge() and commit()? thanks in advance. Thunder __._,_.___ -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com SPONSORED LINKS Web site design development Computer software development Software design and development Macromedia flex Software development best practice YAHOO! GROUPS LINKS  Visit your group "flexcoders" on the web.    To unsubscribe from this group, send an email to:  [EMAIL PROTECTED]    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. __,_._,___