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Look up ROW CHANGE TOKEN in the DB2 reference. The DB will give you the token on read, and you only have to compare one thing before an update.
-----Original Message-----
From: Booth Martin [mailto:booth@xxxxxxxxxxxx]
Sent: Monday, December 18, 2017 12:33 PM
To: RPG programming on the IBM i (AS/400 and iSeries) <rpg400-l@xxxxxxxxxxxx>
Subject: Re: 5250 and un-do
Make the plan with no protracted locks. That's pretty standard practice now, thanks to the training you and others provide for us.
I like the idea of an array with before/after image of each change made. It works even for two users in the same file. If I undo, get the data, compare it to my after image and it is different then I know another user changed the data and I need PlanHuh? If the images compare, then make the data the before image and it's undone.
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