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From Michael Gentry <mgen...@masslight.net>
Subject Re: Optimistic Locking 2
Date Mon, 22 Nov 2010 15:17:41 GMT
I didn't entirely follow your question.  Cayenne only sends changes
for the fields that changed.  If you have an object with 50 attributes
and one of them is firstName and you only change the first name, then
only the firstName column is sent in the SET portion of the SQL.

UPDATE xyz SET firstName = 'new first name' WHERE ...

If you changed firstName and lastName, it would be:

UPDATE xyz SET firstName = 'new first name', lastName = 'new last
name' WHERE ...

Cayenne won't send all 50 attributes over in the SET clause unless all
50 change.  Cayenne is smart enough to know which attributes changed
and only send those.

mrg


On Mon, Nov 22, 2010 at 6:00 AM, Bruno René Santos <brunorene@holos.pt> wrote:
> I was seeing the documentation about optimistic locking on Cayenne and this
> phrase:
>
>
>
> Cayenne is also smart enough to know which values have changed (only firstName)
> and doesn't update the unchanged values.
>
>
>
> Got me thinking... Does this means that if I change other fields (besides
> firstName)on this records they get changed? My wish was not to change anything
> on the record until all fields are consistent.
>
>
>
> Thanx
>
> Bruno
>
>
>
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