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FastGeert
Jul 9, 2012, 9:07:12 AM7/9/12
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Hi,
is it possible to perform non-transactional datastore queries from inside a transaction?
In the java version of appengine, it is possible, but as far as I read in the python documentation, I don't think it is possible in the python version of appengine.
pdknsk
Jul 9, 2012, 10:28:30 AM7/9/12
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I don't know if it's documented, but it was mentioned in the release
notes.
The Datastore API now includes a NonTransactional decorator to ensure
that a function is run outside of a transaction. Existing transactions
are paused while the function is executing.
notes.
The Datastore API now includes a NonTransactional decorator to ensure
that a function is run outside of a transaction. Existing transactions
are paused while the function is executing.
Guido van Rossum
Jul 9, 2012, 5:08:55 PM7/9/12
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Also, in NDB you can run multiple transactions as well as non-transactional code "concurrently" using the propagation option to transaction() or @transactional(), or the @non_transactional decorator. (I put "concurrently" in parentheses since this is not a multi-threading API but simply uses NDB's async I/O facilities.)
See the docs at https://developers.google.com/appengine/docs/python/ndb/transactions (which sadly misspell this flag as "propogation". I will fix this.)
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