Blogues

4D FOR FLEX

warning: file_get_contents(http://www.telize.com/geoip/54.80.236.48) [function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found in /var/www/www.4d.com/docs/includes/common.inc(1762) : eval()'d code on line 4.

Does 4D for Flex require 4D Server?

Not for development, but for deployment, yes.

Can I call existing 4D code with 4D for Flex?

Yes, you can call 4D methods published for SQL.

 

Simply check the "Available through SQL" box in the method Properties Editor, and call it from your SQL code.

 

See the provided examples for how this is done.

Does 4D for Flex require modifying existing code?

No server-side code is necessary, but you'd better add some security control in the new On SQL Authentication database method.

Can you lock records in 4D for Flex?

You can use the SELECT FOR UPDATE feature. Please see the manual for more information.

Does 4D for Flex provide a persistent connection?

You've got two communication modes between 4D & Flex:

 

• Using HTTP (or SOAP over HTTP), working in disconnected mode, exchanging data in Plain Old XML (POX)

• Using SQL sockets with 4D for Flex, working in connected mode, exchanging data through a binary protocol

Which port is used by 4D for Flex?

The SQL Server port set in the preferences, default was 1919 until 11.2 and is now 19812.

 

Of course, this port needs to be available through firewalls.

What's the difference between 4D for Flex and DAX?

They both target developing RIAs for a 4D Server. But, they really follow two different schemes:


4D for Flex works in a connected mode, without any component on Server side. The communication between the client and the Server relies on a proprietary SQL protocol (same as the one used for ODBC support for 4D SQL), so it requires opening a special port on firewalls for allowing communication.

Quelle est la version minimale de 4D nécessaire pour utiliser 4D for Flex ?

La version minimale de 4D nécessaire est 4D v11 SQL Release 2 (11.2)

4D for Flex est-il compatible avec d'autres sources de données SQL ?

Non, il utilise un protocole SQL spécifique à 4D SQL Server.