Depending on the list of keys, it might be faster to use a query. I have
a case, where I have a sorted list of key names and the there is no
other key in the datastore that is bigger than the first key and smaller
than the last key of the list. I experimented a bit, and for me, the
following solution was significantly faster than getting all keys with a
batch get.
SELECT * FROM Model WHERE __key__ >= :key_first ORDER BY __key__
(and fetching length(list) entities)
I don't know if your list of keys has a similar structure, but I thought
it could help you.
-Ulrich
Josh Rehman wrote:
Thanks! Knew it had to be in there somewhere. :)
http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/DatastoreService.html#get(java.lang.Iterable)
<http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/DatastoreService.html#get%28java.lang.Iterable%29>
On Thu, Mar 18, 2010 at 5:39 PM, Tristan <tristan.slomin...@gmail.com
<mailto:tristan.slomin...@gmail.com>> wrote:
look in DatastoreService get()
On Mar 18, 7:33 pm, JavaJosh <javaj...@gmail.com
<mailto:javaj...@gmail.com>> wrote:
> BTW in python this would be db.get(keys). :)
>
> On Mar 18, 5:32 pm, JavaJosh <javaj...@gmail.com
<mailto:javaj...@gmail.com>> wrote:
>
>
>
> > Hi,
>
> > I'd like to use the low-level datastore API (Java) to deference a
> > (potentially long) list of keys into their respective
Entities. I've
> > scoured the API and searched messages in this group, and don't
see any
> > answers.
>
> > I primarily looked for a method on Query that takes a
Collection or
> > Array of Keys. Didn't find it.
>
> > For now I can get by with a for loop. Ghetto but it works. I'd
like to
> > do better.
>
> > Thanks.
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