Re: RPG read loops

I did it.

For each file (physical, logical, with ot without key), i build one source
with some procedures :
    Get_Filename          (CHAIN)
    Set_filename            (SET, LL, GT)
    Exists_filename        (SETLL without read)
    Read_filename         (READ, readp, readE, READPE)
    Insert_filename        (write)
    Delete_filename       (delete)
    Unlock_filename      (unlock)
    Update_filename     (update)
    dft_filename            (populate the exported datastructure with defaul
values)
All "READ" procedures include a parm (*on/*off) to lock or not the record)

Create a module and one service pgm by file
a ds (io_filename) is exported.

It is not done by hand, i create a little pgm that get file decription and
create all sources needed (procedure interface, module...)

When i use suche a procedure, i include 3 lines :

    /copy of the bnddir (it is one with only IO service pgm)
    /copy of procedure interface
    an external DS (linked with the file) if i use data from the file.

the only think (for me) to watch is in a loop that call a program that read
the same file i must make a setgt before the next read.
all procedure return *off if request fald or *on if not.

My loop are like this :

Dow    Read_filename (*off : '*NEXT' : '*EQ' : Key1 : Key2 ...)
do staff
Enddo

One cool thing is that i can change the file (add new fields at the end)
without getting level error (new field will not be usable until i recompile)
I have a performance gain, and all IO for a file are in ONE source.
It is new for us, but all find it easy and pretty to use.

My little piece of 0,1 euro.



----- Original Message -----
From: "Tony Carolla" <carolla@xxxxxxxxx>
To: "RPG programming on the AS400 / iSeries" <rpg400-l@xxxxxxxxxxxx>
Sent: Wednesday, February 02, 2005 1:50 AM
Subject: Re: RPG read loops


> Paul -- Now that makes sense!  In this way, even though you have a
> module for each file (or even multiple), you can reuse this module for
> all programs that access the file.  This reminds me of what I read in
> the sorcerers guide about externalizing output.  It really makes
> sense.  Thanks!
>
>
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