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Resolved A query about the SQLPreview Event
  1. How-to
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  1. Krishna Mohan Gullap
  2. PowerBuilder
  3. Wednesday, 17 July 2024 02:18 PM UTC

I have a question about the SQLPreview Event of DataWindow

When you want to skip your current query based on a specific condition, for example, if I want to skip a DELETE query from being sent to the database, I can return 2 from this event, and it will skip the current query pass entirely, and will move on to the next query (whatever records are waiting to get UPDATED or DELETED or INSERTED)

When we use a return 2, at the end of the SQLPreview event, maybe because we decide to skip the current operation, the DataWindow removes the record from the DELETE buffer for a Delete statement ( I believe it would set the status of the row to NotModified for that row in the Primary buffer in case we skip an INSERT operation, I haven't tested this, but it's just a guess)

I have written some code to take a backup of this record in a datastore (which rather looks ugly :-) ), and use it later and this code works (although what I might do later with this copied row is TBD)

Is there a way I can instruct PowerBuilder to keep the row while I also decide to skip the current query? I think NOT. This indeed looks like a weird scenario. I can alternately return 1 but that will stop subsequent updates/deletes/inserts from happening

Any suggestion helps!

Thanks,

Krishna

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