If you are saying you want the server component to be on the same
machine as the Flex app, then your choices are severely limited due to
the sandbox, unless of course you are using AIR, then you can just use
the SQLite database.But if there will be a sevrer component on another
machine on the web, you could use BlazeDS, and like I said, its free and
very
robust.http://opensource.adobe.com/wiki/display/blazeds/download+blazeds+3http://learn.adobe.com/wiki/display/Flex/Creating+a+BlazeDS+web+servi...