Hi All
Thank you for the helpful comments! I am fine leaving the SQL Execute
statement in place, but thought the question was worth asking.
-Rob
On Tuesday, May 25, 2021 at 8:06:46 AM UTC-4 Carlos Correia wrote:
> Às 18:20 de 20/05/21, Rob Paire escreveu:
>
> Hello all,
>
> I am wondering if it's possible to use DAL update method to increment the
> value of table column H_REVNO in one line of code, and one trip to the
> database?
>
> I tried this query, and a couple of similar variations, but could not get
> it to work.
> db(db.KICKER.id == request.vars.kicker_id).update(H_REVNO=H_REVNO+1)
>
> Here is what I am using for now
> db.executesql("update KICKER set H_REVNO = H_REVNO + 1 where ID = "+
> str(request.vars.kicker_id)) which of course works.
>
> Thank you all!
>
>
>
> Hi,
>
> Using DAL you have to read the record first in other to get the value to
> be incremented. But, if there are many users it might lead to corrupted
> values due to concurrency.
>
> As far as I know, the latest is the only sane approach to solve your
> problem.
>
>
> Carlos Correia
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