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  2. RPG400-L
  3. May 2016

Re: Conceptual subfile question

I do not understand the technique then. Where is the original data kept? A user reads 55 records into a subfile and then changes record number 22. Where, exactly, is the original data for subfile record # 22 stored, if not in a hidden field?

On 5/3/2016 3:46 PM, Jon Paris wrote:
Yes Booth - you can also do it that way - but you’re not answering the same question then.

Comparing before/after display images tells you whether _your_ operator made changes on the screen.

Comparing previous/current disk images tells you whether somebody else changed the record while you were waiting for the operator to decide what they donated to do.

You can of course combine both techniques. I should have mentioned that the article was dealing with not holding prolonged locks on the database but the same basic “image” technique works just fine as a means of avoiding hidden fields.


Jon Paris

www.partner400.com
www.SystemiDeveloper.com

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