Hi all,
I'm facing a little problem of scalability. I'm using JDO to query my
datastore.
I need to retrieve all the keys of a given entity (such keys are of
type Long). Given that in my datastore such entity has 1.000.000 of
records, I need to get them in a very efficient way, in order to loop
over this set in a background task.
Which is the most efficient way to do this?
And what if I need not only the key, but also another field? Let's say
I've got an entity called TPImage:
Long idPic; //this is my key
String title; //this is the field I want to retrieve together with the
key
... // other properties
How may I retrieve both idPic and title in a single efficient query?
Something like
Query q = new Query("select idPic, title from " +
TPImage.class.getName());
but more efficient?
Thank you very much!
Bye
cghersi
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