Webservices and XSQL

Question

Hi!
I have a question: I would like to use Oracle's XSQL servlet. I have a .xsql file
which calls a function and returns a data in XML format. Now how can I use this
in weblogic using webservices?
Anybody has an idea?
Thanks in advance
..Madhuri

Answer 1

Currently, WebLogic Web Services only use Stateless Session EJBs (for RPC-style)
and JMS destinations (for Message-style). You can, of course, deploy other Web
Service Platforms (i.e. Apache SOAP, GLUE, WASP, etc.) on WLS 6.1 and use them
;-) They usually support using POJOs (Plain Old Java Objects) as Web service implementations.
Is there some reason why you just aren't using the XSQL stuff by itself? It seems
to be designed specifically for making SQL queries over HTTP, using XML ;-) Why
do you need to create a Web service to "front-end" this capability? Seems like
extra overhead (i.e. SOAP message processing, etc.) with no real "value-added",
if you know what I mean ;-) Is it because you want (or need) to introduce a "layer"
or facade pattern for XSQL, or something?
Regards,
Mike Wooten
"Madhuri" <[email protected]> wrote:
>
Hi Mike!
Thanks for the help. Is there any other way, I mean without using EJBs
can I achieve
the task?
...Madhuri
"Michael Wooten" <[email protected]> wrote:
Hi Madhuri,
Unfortunately, it sounds like you will need more help than I can offer
at this
time. From your original post, I was under the impression that you knew
about
EJBs, Java XML parsers/XSLT processors, etc. I scoped out XSQL a bit
more, and
it looks like fairly powerful technology, but it requires knowledgeof
XML/XSLT.
Personally, I think you might need some "training" help to create aXSQLService
with a WebLogic Web Service ;-) If you don't have time for that, perhaps
you can
search the Web for example code, and start from there.
Regards,
Mike Wooten
"Madhuri" <[email protected]> wrote:
Hi Mike !
Do you have any sample code for the EJB where the method that accepts
an org.w3c.dom.Element
(or org.w3c.dom.Document) as a parameter, and returned the same, asI
am new for
the EJB or direct me the link where I can get info.. I really appresite
your help.
Thanks
..Madhuri
"Michael Wooten" <[email protected]> wrote:
Yeah, that's what I thought ;-)
If you want the party that submitted to wait while the XSQL file isbeing
processed,
you'll want to build a RPC-style WebLogic Web Service, using the Literal
XML encoding
style. For this, you would have the Stateless Session EJB that actsas
the entry-point
into your Web service "implementation", have a method that accepts
an
org.w3c.dom.Element
(or org.w3c.dom.Document) as a parameter, and returned the same. The
remote interface
for this SS would look something like this:
public interface XSQLService extends javax.ejb.EJBObject
     public org.w3c.dom.Element process(org.w3c.dom.Element xsqlParameters)
throws
java.rmi.RemoteException, org.xml.sax.SAXException;
From the information posted on Oracle's OTN site, the .xsql file(s)will
live
on the "server side", so all you need the Web service client to send
is the parameters
for the .xsql, right? That's why I called the input argument "xsqlParameters"
in the method signature above ;-) Okay, so now we need a way for the
client to
tell us which .xsql file to use, right? If the client knows this,
it's
probably
simpler if they put that in the parameter file too! So using the flighFinder
example
on OTN, that leaves us with a parameter file that looks kind of like
this:
<query uri="fly.xsql" stylesheet="none">
<parameters>
     <FROM>LAX</FROM>
     <TO>SFO</TO>
</parameters>
</query>
The implementation for the process(org.w3c.dom.Element xsqlQuery)method,
is where
you want to create the java.net.URL and java.net.URLConnection toconnect
to the
actual XSQL Servlet, I think. You could them use the getOutputStream()
method
on URLConnection, to get the XML returned by the XSQL Servlet, andmake
it the
return value. Knowing Oracle, they have defined a MIME-type extension
for xsql,
which is how they can "automagically" route http://localhost:7070/fly.xsql
to
the XSQL Servlet. Anyway, I haven't worked with XSQL Servlet before,
but I would
hope it is just a J2EE Web Application (.war file) that can be deployed
into WLS.
If so, it should be relatively simple to do what you want to do.
Regards,
Mike Wooten
"Madhuri" <[email protected]> wrote:
Hi Mike, Thanks for your prompt reply. I would like to send the XSQL
file to a
Web Service, and have it send it to the Oracle XSQL Servlet for processing.
As
XSQL Servlet processes SQL queries and outputs the result set as
XML,and
servlet
takes an XML file containing embedded SQL queries (XSQL file), asits
input. It
returns the data in XML format and that's what exactly I would liketo
do.
Thanks ..Madhuri
"Michael Wooten" <[email protected]> wrote:
Hi Madhuri,
What kind of WebLogic Web Service do you want to use? Document-oriented
(i.e.
where you pass in an XML document/well-formed fragment), or RPC-style
(i.e. where
you pass in function arguments)? What does the client pass to the
Web
Service?
What, if anything, does it get back?
From what I know, the Oracle XSQL Servlet processes SQL queries
and
outputs
the
result set as XML. This servlet takes an XML file containing embedded
SQL queries
(XSQL file), as its input. Do you want to send the XSQL file to
a
Web
Service,
and have it send it to the Oracle XSQL Servlet for processing? Doyou
want the
Web Service to create the XSQL file, from arguments passed in theSOAP
Body element?
Sorry to ask so many questions, but the answers will help me answeryour
"original"
question ;-)
Regards,
Mike Wooten
"Madhuri" <[email protected]> wrote:
Hi!
I have a question: I would like to use Oracle's XSQL servlet. I
have
a .xsql file
which calls a function and returns a data in XML format. Now howcan
I use this
in weblogic using webservices?
Anybody has an idea?
Thanks in advance
...Madhuri