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"Row changed between retrieve and update" -- when upgrading PB
  1. New
  2. Issue
  3.  DataWindow
  4.  Error
  5.  PowerBuilder
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  1. Richard Hartman
  2. PowerBuilder
  3. Friday, 22 August 2025 05:54 PM UTC

 

 

Our old datawindow sources say "revision 7" and the new ones (powerbuilder 2021) say "revision 21".

I found another posting for this issue here (https://community.appeon.com/qna/q-a/datawindow-update-show-row-changed-between-retrieve-and-update) with the same symptom when the were updating from pb 12.5 to PB 2022 R3, but I don't think it was really resolved.  I do not know how their pb version numbers corresponds to the "revision X" in the datawindow sources, but it seems to be a similarly long span as ours.  Somehow the behavior changed from the old PB to the new ones.   Specifically, I think for "updatewhere=1".

In the IDE is under "Rows/Update Properties..." you get this dialog:

 
For the section "Where Clause for Update/Delete" the source code has "updatewhere=X" where X is 0, 1, or 2.
 
The selections are:
    Key Columns (0)
    Key and Updateable Columns (1)
    Key and Modified Columns (2)
 
This problem seems to happen for "updatewhere=1" (Key and Updateable Columns).    (Again, though, in the older PB versions this seemed to work without encountering that error.)   If I use "updatewhere=0" this does not happen.   I Have not tried "updatewhere=2" yet.

The thing is, that using "updatewhere=0" does sacrifice some concurrency protections, e.g. if two people are working on the same record at the same time, the "updatewhere=1" setting would provide protection should user A change it while user B has it in the window for editing.   But I can't use it if it continues to provide false change detection.


So ... I found some discussion suggesting that this error may be set off by a trigger.   But I am a bit confused.  The trigger does not execute until you update the record.  Nothing changes before then. (Also, there specifically were NOT other people editing the same record at the same time.)   What would the sequence of events (data reads/writes to/from the server and the trigger actions) be that would convince powerbuilder that the record had changed while I am updating it?   I would like to have the extra concurrency protection if I can figure out how to eliminate these false change detections.

This is going against an MSSQL server, if this makes any difference.   The old one was going against Sybase ASE.
 
 
 
 
 
 
Select Error: The command extension block has not been alloc...
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