RE: Externalizing I/O was RPG read loops

[rob@xxxxxxxxx]

I get my enforcement of business rules with triggers and constraints. 
Stops even the errant developer who updates a file directly with any 
utilities.  Again, only one place to maintain the logic.  Don, are you the 
developer of these functions, or only a user?

Rob Berendt
-- 
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





"Fisher, Don" <Dfisher@xxxxxxxxxxxxxxxxx> 
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
02/02/2005 11:18 AM
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RPG programming on the AS400 / iSeries <rpg400-l@xxxxxxxxxxxx>


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RE: Externalizing I/O was RPG read loops






I used to think the same way.  It took me quite a while to understand the
benefits of such functions. 

I've been experimenting with them here and have used them to make my file
updates, writes, deletes, etc. exist in only one place.  The same logic to
perform these functions is executed each time one of these operations is
requested.  It gives me the ability to enforce business rules and have 
only
one place to maintain the logic.

The case for procedures that merely return the data is more difficult,
except I've found these procedures integrate well with the update and 
record
creation procedures.

Donald R. Fisher, III
Project Manager
Roomstore Furniture Company
(804) 784-7600 extension 2124
DFisher@xxxxxxxxxxxxx


<clip>
I think you're the first person that I heard of, that wasn't the person in
charge of writing the access programs, that actually liked this scenario. 
Why an end developer would like to replace

chain(e) myfile;
// now actually do some real work with the fields

with
getFilename();
MyWorkField1=GetField(field1);
MyWorkField2=GetField(field2);
...
// now actually do some real work with the fields

rather escapes me.
<clip>
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