Flex does not have any native database integration functionality. You must have
your own server-side tier that provides the database-access tier and sends the data
back to Flex through one of the following protocols:
• RemoteObjects: This is the fastest. It communicates with server-side EJBs or POJOs
using AMF, a binary compressed format.
• HTTPService: This one uses the HTTP protocol. Sources can be JSP, ASPx, .NET,
or any URL that returns HTTP.
• WebService: This is the slowest. It uses the SOAP protocol. Sources can be .NET
or any web service.