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  1.  Home
  2. RPG400-L
  3. April 2002

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

Currently through the procedure.

>>> dmosley@dancik.com 04/12/02 08:15AM >>>

Are you passing the 'object structure' back and forth though the procedure,
or are you using the EXPORT/IMPORT capabilities?

David L. Mosley, Jr.
Systems Analyst
2000 CentreGreen Way
Suite 250
Cary, NC 27513



                    "Andrew Lutz"
                    <alutz@pmigroup.c        To:     <rpg400-l@midrange.com>
                    om>                      cc:
                    Sent by:                 Subject:     RE: Separation of 
Presentation, BL, and I/O Tiers
                    rpg400-l-admin@mi
                    drange.com


                    04/12/02 10:55 AM
                    Please respond to
                    rpg400-l






Aaron,

I have implemented this setter/getter for every field methodology in a
previous project.

Yes, we generated the programs automatically.

But eventually you must maintain them outside the generator.  Lot of work.
Not to mention a lot of procedures, that made Large programs.

This time we are implementing a

getState()

setState()

style approach where the entire object structure is passed.  Much simpler.
Easier to maintain.  Smaller programs.


>>> ALBartell@taylorcorp.com 04/12/02 06:32AM >>>
We are trying something new in our software where we are doing something
similar to what is being talked about here.  We are creating IO modules for
all of our files.

Here's what I am wondering.  Since every service program will be the same
except for the names of the subprocedures we are thinking about writing a
program to produce the getter and setter methods for each field, similar to
how some Java IDE's do it for you based on the variables you define in the
object.  We wouldn't be writing a program to do this if there wasn't a
gazillion files that we had in our software, but each one needs to have a
service program created for it.

Has anybody done this before, and if you have would you be willing to share
the code that it took to dynamically write the programs?

Thanks in advance,
Aaron Bartell



-----Original Message-----
From: dmosley@dancik.com [mailto:dmosley@dancik.com]
Sent: Wednesday, April 10, 2002 2:35 PM
To: rpg400-l@midrange.com
Subject: RE: Separation of Presentation, BL, and I/O Tiers



I curious about the use of MODS (and thank you Aaron for asking the
meaning).
Is the use of MODS easier than using single record retrieval.
Reason I'm asking, is becuase I've created a very basic service program
with two primary procedures.   @SETLL, and @RTV.
The @SETLL dynamicaly builds the Select statement based on passed
position-values, and prepares the statement.
Then I would do a DO-loop around my @RTV and retrieve each individual
record as they are FETCHed.  The @RTV would pass back an error-indicator.
This indicator would specify either EndOfFile, or Error-Occurred during the
FETCH.

Anyway, I've been using this type of retrieval for a while, and never
really thought about using MODS.  Does using MODS enhance the performance
of the FETCH any?

Thanks
dav


David L. Mosley, Jr.
Systems Analyst
2000 CentreGreen Way
Suite 250
Cary, NC 27513



                    "Smith, Nelson"
                    <NSmith@lincare.c        To:
"'rpg400-l@midrange.com'" <rpg400-l@midrange.com>
                    om>                      cc:
                    Sent by:                 Subject:     RE: Separation of
Presentation, BL, and I/O Tiers
                    rpg400-l-admin@mi
                    drange.com


                    04/10/02 03:23 PM
                    Please respond to
                    rpg400-l






If you have to define it at the maximum occurs, what does being dynamic buy
you?  Would you immediately go in at program startup and resize it back
down
to a reasonable number?  Would that be the benefit?

You say "as for an array".  I thought I had seen examples of people
starting
off with a 100 element array and then resizing it to 200?  You can't do
that?

The end result I'd like to get to is to have an I/O routine that gets a
bunch of records (by RPG, SQL, Stored procedure, whatever), sizes an array
or ds to hold them based on the number it found, then just return a pointer
to the structure along with the number of records contained in it.

So, would the I/O module have to declare the MODS at the maximum Occurs,
get
the records, then reallocate the MODS back down to the actual number of
records retrieved, then return to the calling program?  Then, the calling
program would have to do the same thing, start off with a maximum size ds,
and reallocate it down after it got the pointer back from the I/O module?

Is that the scenario? Would there be any performance issues here, when an
application may be doing this for hundreds of files?

> -----Original Message-----
> From:   Jon Paris [SMTP:Jon.Paris@Partner400.com]
> Sent:   Wednesday, April 10, 2002 2:51 PM
> To:     rpg400-l@midrange.com
> Subject:     Separation of Presentation, BL, and I/O Tiers
>
>  >> I've seen several posters saying they could, but have seen no
examples
> of that, yet.
>
> MODS can be based (and therefore dynamically sized) just as arrays can.
> The
> limitation (as for an array) is that you must define the number of
> occurrences as the largest number you will ever need.  I like the
> technique
> because it has the added advantage that you can have multiple definitions
> of
> the DS and map them to individual occurrences of the MODS so you simply
> directly compare multiple occurrences.
>
> You can also use things like the C qsort and bsearch routines to sort and
> search the MODS.
>
> Jon Paris
> Partner400
>
>
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