--- In [email protected], "raja_s_patil" <kpr.rspa...@...> wrote:

(Snip)

> 1> The application should be independent of Backend database.
>    i.e. it should be able to use any of Oracle, MS-SQL, MySQL,
>    PostgreSQL, Firebird as backend.
> 2> The business logic should move from Stored procedures to some
>    middle layer i.e. to Application server.
> 3> It should be possible to separate application server and database
>    server i.e. application server and Database servers can be at
>    different physical locations or they can reside on same server.
> 4> the communication between database server->application server and
>    application Server->Client should be secured one or may be
>    encrypted so that man in middle is not able to modify the data

None of these have anything to do with Flex. It all depends on the middleware 
you decide to use. In my case, I use PHP connecting to MySQL databases located 
on multiple different servers. I use WebORB as my AMF de/serializer which also 
has an option for secure data transfer.

> To best of our knowledge we have got a rough layout as follows.
> To start with have spring as application server with hibernate
> integration for data access. Then Flex application will 
> communicate with application server through BlazeDS.

That is definitely one way to do it. Another way would be with something like 
WebORB. They have a solution for .NET, Java, PHP, ColdFusion and Rails.


HTH.



Steve 


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