RE: MVC in RPG?

3. Changing field sizes/attributes will always be trouble. However, with a DB layer you could get
away with for instance expanding a name field from 30 to 50 without a mass compile assuming that you
decide there's only a few place where you need the full name. More useful is the ability to add
fields without a mass recompile.

4. Activation groups play a big role in handling this. You could also design in some ways to handle
this.

I'm a fan of the DB layer. In fact, I'm partial to having a DB layer + a business logic layer.


Charles

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Lim Hock-Chai
Sent: Tuesday, October 02, 2007 12:50 PM
To: RPG programming on the AS400 / iSeries
Subject: RE: MVC in RPG?

I agree that some form of export procedures should be
provided to access the master files that you described in
your email. However, that is likely to be an exception to
all files in your system. Exception, IMHO, should not become
the norm on how one handles access to all files in the system.

3. OK. I just want to point out what Rob D (I think Rob said
this before. Sorry if I miss quote) has mentioned before: It
is a myth for developer to think that DB layer will prevent
mass recompile when field change is required.

4. Your DB layer basically has the same effect of opening all
files with share data path of *yes. The could be come
problematic nor matter how well you design your system.

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