RE: MVC in RPG?

3. I'd never have my DB layer return a LIKEREC/EXTFILE DS. Instead, it'd return a named DS like
ItemRec001 that would be defined in the copy source that included the prototypes. So If you add a
field, you add a new DS with the new format. Basically like IBM's APIs do. Besides which, I very
rarely return the entire record. Doing so isn't needed if you're encapsulating properly and only
makes it to easy to break encapsulation. The only program that really needs most of the fields in a
file is a CRUD application for a master file or a file dump type program.

4. I wouldn't want to hire a programmer who couldn't get a very good idea of what
getNextCustomerOrder() did by looking at the procedures name and how it was being used without looking
at the code behind the procedures.


Charles

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Lim Hock-Chai
Sent: Tuesday, October 02, 2007 3:53 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: MVC in RPG?

3. If you still have to do research on all programs that
uses the DB layer when changing attribute of a field, you are
really not gain much from it. As far as adding new field, it
is only true if your DB layer does not have procedure that
allowed caller to get the entire DS of the file.
Unfortunately, getting the entire DS is a pretty useful
function to have.


4. There are several ways to go around the problem, the
point being that are you really gaining anything from DB
layer? Why replace RPG io functions that all RPG developers
are familiar with with your own io functions that no new
comer can understand without additional trainings?

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