Yes, I've read the document. I'm looking for some examples.
As I said, I have a class, C1, whose entities have no ancestors. I want to
query a particular entity from it, modify, and put it back, for example,
item = C1.gql("WHERE p1 = :a AND p2 < :b ORDER BY p2", a = None, b =
today).fetch(1)
item.p1 = now
item.put()
Both p1 and p2 are datetime. How can I build this into a transaction? Is
there a way I can give the entities a 'place holder' ancestor so I can later
use an 'ancestor filter' in the query to satisfy the requirement?
Thanks,
Will
On Fri, Nov 13, 2009 at 9:44 PM, Stephen <[email protected]> wrote:
> On Nov 13, 2:27 am, Will <[email protected]> wrote:
> >
> > Can you give me some examples of 'ancestor queries'? If possible, I'd
> like
> > to change the existing ones into 'ancestor queries' and fit the whole
> into a
> > transaction, because that is exactly what a transaction designed for.
>
>
>
> http://code.google.com/appengine/docs/python/datastore/transactions.html#What_Can_Be_Done_In_a_Transaction
>
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