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The following web page may be of help to you.
http://www.discinterchange.com/tech_talk_.html

in particular, scroll down the left hand side under
COBOL
particularly with
COBOL computational fields
and
COBOL comp-3 packed fields



Alan Shore

NBTY, Inc
(631) 244-2000 ext. 5019
AShore@xxxxxxxx


                                                                       
             Neal Hudson                                               
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                                                                   Subject
                                       Help with converting Mainframe file
             08/02/2006 07:24          on iSeries                      
             AM                                                        
                                                                       
                                                                       
             Please respond to                                         
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             <midrange-l@midra                                         
                 nge.com>                                              
                                                                       
                                                                       




Hi there,

I'm looking for some advice/help on a file that I'm having some trouble
with. The file originates from a mainframe, and is sent over to our iSeries
(V5R2M0) via Connect:Direct. The file is 3680 Bytes long, comprising of
string and compressed numeric data. I have the layout of the file, although
it's in a notation I'm not familiar with, Cobol I think it is, which gives
me the start and end position of all the fields, and what type they are.

My aim is to get this file from the 400 to a PC, with all the fields, in a
CSV format, on a monthly basis as it's received. This solution is an
interim one, probably lasting for a few months, no longer than a year.

What I've done is set up a physical file, defining all 300 or so fields in
the file. I then copy the file received in the Connect:Direct library into
my own file using the CPYF command with a *NOCHK option. This works fine,
all the records are copied, but when I query the file 1 of the fields is
unreadable and I get the message "Column B9012 contains replacement
character +".

This field is defined in the layout file I have as:
   211         09 PRRS-S1C-EDITION-NUMBER        PIC  S9(08) COMP.
This means that the field starts at position 211 in the file. The next
field starts at position 215, so I've defined my field in the physical file
as:
A            B9012          7P 0       TEXT('S1C-EDITION-NUMBER')
All the other compressed numeric fields have the notation COMP-3., whereas
this one is only COMP. - I'm not sure what the difference is there.
It would seem that the field is a compressed or packed numeric field, of 8,
but for it to start at 211 and end at 215 I have to define it as 7 in the
physical file. Do you have an idea of what I can do here?

At the moment, seeing this field is not essential, after the copy file
command I'm just running through the file and setting the value to 0.

The next question I have is around Client Access. When I run Query, there
are no errors shown in the file. However, when I try to use the "Receive
File From Host" facility in Client Access, I get the error "CWBDB0052 -
Error occurred during data conversion", but all records transfer
successfully. I can't figure out which fields are in error, although from
reading on the internet it would appear there may be null values that are
causing this. I've switched off the option to display warnings during data
transfer, which stops the message occurring. Would there be a problem I'm
masking by doing this?


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