RE: Separation of Presentation, BL, and I/O Tiers

This sounds interesting.  I'm just starting to try this sort of thing, and I
find two tiers a lot easier to manage, particularly using record level I/O.
I'm not convinced that's the right thing to do, but it's easier.  I think
it's great to have some discussion, particularly from people with more
experience.

> -----Original Message-----
> From: Smith, Nelson [mailto:NSmith@lincare.com]
> Sent: Wednesday, April 10, 2002 11:01 AM
> To: 'rpg400-l@midrange.com'
> Subject: RE: Separation of Presentation, BL, and I/O Tiers
>
>
> I'll check out the article and would love to see examples.
>
> When you say mediator, do you mean something like converting
> the application
> over from one that uses a entire externally defined record to
> one that uses
> only the data it really needs, through a GetCustName() and
> GetCustCity()
> kind of procedure, for example?  Then, the procedures would
> be the only ones
> actually using the I/O modules?
>
> I've implemented this in a few file-specific service programs
> where the
> actual I/O module is a local procedure in the service program and the
> exported procedures use it, but haven't gotten real far with
> that method
> yet.  The lack of generic-ness has been somewhat of a stumbling block.
> Isn't this what the Get and Set methods in OO programs are
> all about?  I
> think I've read they do a Get/Set pair for every field in a file.
>