Re: [flexcoders] Re: Updating the data back to database

[Anatole Tartakovsky]

If you need to do it in Flex 1.5 you relally need to put significant amount of code in your base objects. We implemented in 1.5 just what Dave is suggesting with "PowerBuilder" approach ( which was considered a standard of Enterprise RAD - Rapid Application Development)- high-level objects that keep track of the state of each database record, with an ability to send the changes to the server. Unlike Flex 2, we implemented automatic generation of "updates" based on original "selects" and minimal metadata so you do not need to write your own persistence layer. Just write  SQL to select the data - and     Java/Flex UI is generated for you automatically - including Java DAO, updatable datagrids, forms and master/details. And we also placed nice toolkit on the top of it so users can select/apply their own layouts (persisted in database) in run-time if needed. Of course, code generators can be tuned for iBatis or Hibernate or any other - as long as there is justification for it.   Other things that I have not seen in Flex 2 but are the must for real-life applications are "transaction" services, when you can submit changes to multiple objects at once. For that we had to write specialized gateway so we would preserve AMF/HTTP infrastructure for development (called RPC in Flex 2) while adding "transactional" methodology to the calls.   So, it is very possible - the only bad news is that any framework as such has learning curve, especially if the team is skilled with Web technologies, and do not have PowerBuilder one. When we bring this to our customers it takes anywhere between 2 to 4 weeks of mentoring to get the team to RAD mode. While it is definetly more economical then writing all modification code for any application that is more then just few screens, and proved to produce much fewer "errors", decision to use it has to be made very early in the development process (or pilot if possible). Hope this helps, Anatole Tartakovsky   ----- Original Message ----- From: Dave Wolf To: flexcoders@yahoogroups.com Sent: Thursday, January 19, 2006 4:47 PM Subject: [flexcoders] Re: Updating the data back to database In Flex 1.5 there  is not.  However Flex 2.0 will include the "Enterprise Data Services" which include exactly this functionality. This was demonstrated at MAX last fall and Adobe has presented several web casts on it.  As you note (and much like other existing client/server products like PowerBuilder) the data services will include the ability to track "changed" or "dirty" data on the client, marshal those changes to the server, and will provide for a pluggable persistence layer which will handle writing the changes in an optimized way to the underlying data store.  This will include things like optimistic updates, etc.  -- Dave Wolf Cynergy Systems, Inc. Macromedia Flex Alliance Partner http://www.cynergysystems.com Email: [EMAIL PROTECTED] Office: 866-CYNERGY --- In flexcoders@yahoogroups.com, "mydmjac" <[EMAIL PROTECTED]> wrote: > > Does Flex provide any ways of identifying data changes made by users? > Obviously I am new to Flex, and I noticed that there are lots of tips,  > information on interface, controls, also how to retrieve data from the > server. However I haven't been able to find any reference for updating > process, some components like XUpdateResolver in Flash make it a lot > easier to move the changes back to the server and finally to the > database. > -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com 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.