Sam,
I >think< the program must have declared the file as
keyed on the F spec (pos 34/Record Address Type I think)
With that said, I would expect to get the record with the lowest WAREHOUSE.
This from the ILE RPG Reference:
"When the CHAIN operation is successful, the file specified in name is positioned
such that a subsequent read operation retrieves the record logically following or
preceding the retrieved record."
However, I don't find a detailed description about multiple keys . . .
-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Sam_L
Sent: Wednesday, March 27, 2013 3:19 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: CHAIN on a Partial Key
I have a logical file uniquely keyed on ITEM and WAREHOUSE.
I have found an (incorrect) program that does a CHAIN to this logical using just ITEM. (The assumption may have been that it would get the lowest WAREHOUSE which is where most stock is, but it is old code and I can't ask anyone.)
I believe it sometimes gets a record that isn't the lowest WAREHOUSE and ITEMS sometimes vanish from a report because there is no stock in this warehouse.
Some eagle eyed person found items missing from a report from last year.
We restored the PF and the LF from a backup tape to another library, reran the report, and the missing items correctly turned up.
I believe that there is no guarantee that if you do a CHAIN on ITEM that you are guaranteed to get the record with the lowest value of WAREHOUSE and that randomly we get another record.
Others are skeptical that I have found the cause, but it is a complicated program stack and we haven't found any other reason.
Question 1: Am I on solid ground with my belief?
Question 2: Does any one know of any documentation on this subject?
Thanks, Sam
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