A better description of object oriented design I have not run across in a
long time. Nice.
One thing that constantly flummoxes me is why folks think they cannot use
object oriented design and building techniques with IBM i even if they are
using RPG or even COBOL for that matter. I'm told RPG and COBOL are not
object oriented therefore the techniques won't work. Not true. What
Birgitta just described is an excellent, concise, and to the point
description of the modernization that needs to happen to many if not most
applications running on IBM i . Executives don't care about hardware or
OS, they care about the application and if we would all start using what
Birgitta just described, we'd win hands down. DB/2 on IBM i is not perfect
for all applications, but most business applications will thrive on it.
The original post asked for a roadmap to move to a modern database and
application suite. Birgitta just laid it out for you.
--
Jim Oberholtzer
Agile Technology Architects
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Birgitta Hauser
Sent: Wednesday, January 11, 2017 11:52 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Road Map to move a home grown application from RPG to DB2 SQL
or to any other data base platform
Even though I agree with converting DDS to DDL, I'd not agree to translate
RPG into SQL, because there are a lot of things available in RPG that cannot
be covered with SQL.
I'd first try to move business logic from RPG into the database, i.e.
creating and using complex views and use them composition with embedded SQL.
Adding check constraints, referential integrities and triggers to the
database tables.
Also I'd create service programs that include all database access
procedures. And finally there will be only a single procedure (per table)
that will solely do the update, another one that will do the insert and a
third one that will cover the delete.
Additional check procedures that are also called before the insert, update
or delete and that will check whether the insert, update or delete can
performed and that will set default values, can be added.
After all of the logic is moved from the RPG-programs into the database,
there will be only a minimum of source code left.
Whether you keep those sources in RPG or decide sometime to convert it into
any other programming language (not SQL because it may not cover what is
left, but may be Java or what ever will be a nice programming language in
future) does not matter.
The main work is done by the database.
Also if you reduce the source code for data access and want to have a
graphical user interface, you may translate your dialog programs into PHP or
Java Script or whatever. All of these languages can use SQL.
You even can register RPG functions as UDFs to be called from SQL.
Mit freundlichen Grüßen / Best regards
Birgitta Hauser
"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok) "What is
worse than training your staff and losing them? Not training them and
keeping them!"
?Train people well enough so they can leave, treat them well enough so they
don't want to.? (Richard Branson)
-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Mohammad Tanveer
Sent: Donnerstag, 12. Januar 2017 00:32
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Subject: Re: Road Map to move a home grown application from RPG to DB2 SQL
or to any other data base platform
yes DDS to SQL is the first step baby steps to make sure we test application
on each step to make sure nothing is broken...
1. change PF/LFs to SQL tables and indexes.
2. Convert RPG programs to SQL/CLI so that it can be migrated to SQL Server.
3. Convert RPG reports to Tableu/Cognos/Crystal reports 4. Convert DSPF
screens to some frame work like Angular JS 5. Migrate everything to another
platform/cloud..(if there is a need)
Regards
On Wed, Jan 11, 2017 at 3:05 PM, Nathan Andelin <nandelin@xxxxxxxxx> wrote:
My idea is to migrate RPG into SQL/CLI procedures on System i First...
I should make it clear that I don't support the migration of IBM i
applications to other platforms. But if you envision this to be a
gradual process, you might consider a migration from DDS to SQL DDL as
a first step
- before migrating RPG code to SQL stored procedures.
http://www.adsero-optima.com/index.html
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