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  1.  Home
  2. RPG400-L
  3. January 2008

RE: Checking for dupe key on WRITE

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx]On Behalf Of Brian Johnson
Sent: Wednesday, January 09, 2008 4:02 PM
To: RPG programming on the AS400 / iSeries
Subject: Re: Checking for dupe key on WRITE


On Jan 9, 2008 3:03 PM, Bradley V. Stone <bvstone@xxxxxxxxxxxx> wrote:

hopefully if you're writing to a file (or updating) you're
using your only
single unique access path (you do only have one, right? if not... ugh!)



Well, it really doesn't matter. As others pointed out, unless you have a
lock on the table the precludes any other updaters, there is no guarantee
that another process won't write the "new" key value between your test for
existence and your insert. So you really need to handle duplicate key
error.


In a worst case scenario, yes. But that doesn't mean you should only use
the duplicate key error and NOT check for existance before blindly writing a
record.





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