RE: Arrays of Structures as a parameter in V5R1

What is a "DDS object"?  I've heard of physical files, logical files, 
screen files, printer files and even ICF files.  I've heard of tables, 
views and indexes.  I've heard of authorization lists, workstation 
customization tables and a plethora of other objects.  However, what is a 
"DDS object"?

Rob Berendt
-- 
"They that can give up essential liberty to obtain a little temporary 
safety deserve neither liberty nor safety." 
Benjamin Franklin 





"Jerry Myrick" <myrickjr@xxxxxxxxxxxxx>
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
08/26/2003 09:36 PM
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We use three different methods to get data to our RPG programs.

1. PCML - Usually use this when the data that is needed to be passed
isn't very long and contains no arrays for input.

2. DDS - We create DDS object, use Java to create a Java object of the
DDS. You can then use it has an array in Java. We then create a string
to pass it to the RPG program. -  Usually use this when need to pass
array information but is fixed.

3. File - Write to a work file the data that is needed and call the RPG
program to process. Use stored procedure to read the work file to get
the status of each record (If needed). In Java you can use SQL or the
record-level access to write groups of records with one write. Usually
use this when need to have large amounts of data, but the size is
unknown. 

All of these perform well. The PCML is faster than the DDS, but only on
the initial start up. After the DDS Java object has been created, I feel
it performs about the same. I could have created the DDS Java source so
it wouldn't be created on the fly, so the initial overhead wouldn't be
there, but I liked not having to worry about creating the source every
time the DDS changed. 




-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Dave Murvin
Sent: Tuesday, August 26, 2003 7:36 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: Arrays of Structures as a parameter in V5R1

At 06:34 AM 8/26/2003, you wrote:

>Just a suggestion here, but is it possible to pass the information via
XML?
>Maybe even make the RPG program a web service that can consume a simple
XML
>request and output XML?  It would be simple for Java to process the web
>service and parse the result XML.  This would also make it a loosely
coupled
>connection which would allow other process to use the RPG web service
>instead of just Java, _and_ you could have the same thing on a
different
>back end written in something other than RPG if they need ever arose

I had not thought of using XMT.  We are dealing with a third party that 
already has most of the web applications created, we just need to
specify 
and code all the interfaces in the next couple of months.  They
indicated 
that they have experience calling an RPGLE program from their end, so
that 
is what we thought of.  We also have the problem that our internal skill

set (one full time, one part time programmer) does not include XML or 
parsing XML from RPG.  Given our time constraints, I don't believe that
we 
would have much time to develop the skills.

Do you know of any quick examples or tutorials on using XML with RPG?
If 
we have some good samples to clone, it might be an option.

In the mean time, I will probably start with Duane's option 2 suggestion
to 
use structures of arrays.

Thanks for the suggestions.

Dave Murvin
DRM Enterprises, Inc.


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