Flex + BlazeDS + ColdFusion + SQL

Ok, I'm relatively new to this whole Flex thing -- I've been
through a few tutorials, written a few apps, but I'm still unclear
on a few things.
I just want to write an app that reads record(s) from an SQL
database, and allows the user to modify and update those record(s).
Should be extremely simple, and yet somehow it's been overly
complicated by a dozen layers of (seemingly unnecessary) software.
So here are my questions:
#1) Why can't Flex talk to an SQL database directly? Why do I
need ColdFusion for this?
#2) What the heck is BlazeDS? (Yes, I've read the FAQ and I
still don't understand why I need it.) If I'm running BlazeDS, do I
really need ColdFusion? If so, why?
#3) In the BlazeDS FAQ, it mentions something about accessing
server-side Java objects -- so do I need to install JavaEE on top
of CF and the SQL database now, too?
It just seems so overly complicated for such a simple task.
If someone could explain all this to me, I would greatly
appreciate it.

"Laurence MacNeill" <[email protected]>
wrote in message
news:[email protected]...
>
quote:
Originally posted by:
riesvantwisk
>
> 1) Flex (AIR) can talk to SQLite directly and I believe
there is a MySQL
> driver (Also air??) that can talk to MySQL directly.
Other databases are
> not
> supported.
> The main reason for this is that flex (browser) needs a
client/server
> architecture. It more or less is the same reason that
javascript doesn't
> talk
> to any DB directly. And the reason is that http protocol
is the 'standard'
> to
> communicate between a web-browser and a remote server,
works across
> firewalls
> etc... For AIR there are simple no drivers yet, but I
believe some are
> currently in development.
> Ok, so basically if I want web functionality in my Flex
app, I have to use
> CF
> because HTTP breaks the direct connection between the
Flex app and the SQL
> database. Fine...
>
>
>
>
quote:
2) If you want to use Blaze-DS then you need java on the
server.
> Blaze-DS
> is your middle layer that accepts a AMF request and
passes the request to
> a
> pojo. Blaze-DS makes it simple to make that middle layer
you hate so much.
> It
> can do more, like sending messages to attached clients
from the
> server.
> Got no idea what a 'pojo' is. Or really what an AMF
request is. I know
> AMF
> has something to do with remote-control of clients, or
something like
> that?
>
>
>
>
quote:
3) TO use Blaze-DS you can use a simple tomcat server if you
want to,
> and I
> believe on the of the Blaze-DS samples even comes with
tomcat.
> Got no idea what a 'Tomcat server' is either. Never even
heard of it.
>
>
>
>
quote:
The whole system is not really over-complex ... <SNIP>
... May be you
> can
> explain what environment you are running?
> Yeah, I'll need my app to run in both a web-browser and
on a desktop.
> It's
> the main reason I chose Flex, since it's just a simple
re-compile to go
> from
> web to desktop (as long as I'm not interested in
Air-specific
> local-filesystem
> calls, which I'm not because all our data is going to be
stored on the web
> server.) Technically I could run everything through a
Flash-equipped
> web-browser -- but why bother with using a web-browser
on local intranet
> machines? Just takes up extra bandwidth on the local
network. So we'll
> run
> the app in Air on local machines, and customers will run
it through their
> Flash-equipped web-browsers on their home machines.
>
> But I still don't get why BlazeDS is needed. What does
it do, exactly?
> And
> how hard is it to set up all the J2EE and Tomcat stuff
(whatever the heck
> Tomcat is) before you're able to run BlazeDS? It just
seems like such a
> hassle. (Heck, CF is enough of a hassle -- I can't even
get that to
> install
> without killing IIS...)
BlazeDS handles all the messaging for you. If you don't need
your apps to
be informed of stuff without making server request, you can
use literally
any back end under the sun, ASP, PHP, even good ole CGI.

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pls find the code snippets for the related change below :
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private function resultHandler(event:ResultEvent):void
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package org.springframework.flex.samples.example;
* TODO Document HelloWorld
* <p />
* @author Vinod.Jayakumar
public class HelloWorld {
public String getHelloWorld(){
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(mx.rpc::Fault)#0
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   errorID = 0
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Request you all to provide your valuable inputs. I know there's really something silly which has gone wrong

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Firstly, you should either need to define the destination in remoting-config.xml or in app-context.xml, but and in both places.
Secondly, the error indicates that it is missing the channel information.
Option 1:
Assuming your bean "helloServiceDestination" uses other Spring beans, then:
1. The right place to declare the destinations is in app-context.xml.
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</mx:ChannelSet>
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I'm no expert, but thought I would try to be helpful.
I was getting this same error on a regular basis.
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imporantly try accessing
http://localhost:8080/myfirst/messagebroker/amf".
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I'm no expert, but thought I would try to be helpful.
I was getting this same error on a regular basis.
The short term fix was to restart the ODBC server service.
The long term fix was twofold:
1. I recreated the ODBC connection in ColdFusion
Administrator to use the system connection (I was using the SA and
PW for login).
2. I created a second user ODBC connection as well as the
system one under ODBC in Windows Server 2003.
I haven't had the problem since.
I also read a pretty good set of "stuff" to try from the help
area:
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=tn_17277
Hope this helps.

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