I don't know the solution in python. Perhaps someone else can lend a hand
here.
The solution in Java is simple, see this as an example:
import javax.jdo.annotations.Index;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;
@PersistenceCapable
public class U {
@PrimaryKey
@Persistent
private Long i;
@Index(unique = "true")
@Persistent
private String n;
public U(Long id, String name) {
this.i = id;
this.n= name;
}
@Override
public String toString() { return "["+n+":"+i+"]"; }
public Long id() { return i; }
public String name() { return n; }
}
Then creating instances and persisting them is all that's left to do.
2010/8/25 Martynas Mickevičius <[email protected]>
> Could you explain more how to use longs as a keys?
>
> On 16 Lie, 19:10, Nate Bauernfeind <[email protected]> wrote:
> > Repeated calls will return items in a deterministic order ascending by
> key.
> > So... yes it is deterministic, though it may not be the order you want.
> >
> > Additionally, you can use Long's as your keys instead of making a counter
> if
> > you need them to return in inserted order.
> >
> >
> >
> >
> >
> >
> >
> > On Fri, Jul 16, 2010 at 11:07 AM, Blixt <[email protected]> wrote:
> > > Okay, so data will be returned in a non-determinate order unless you
> > > specify keys yourself (since ids aren't guaranteed to be in order).
> > > I'll make my own counter.
> >
> > > Thanks!
> >
> > > On Jul 16, 6:01 pm, Nate Bauernfeind <[email protected]>
> > > wrote:
> > > > They will be ordered by key. You should consider watching one of the
> > > > datastore tech talks.
> >
> > > > On Fri, Jul 16, 2010 at 3:54 AM, Blixt <[email protected]>
> wrote:
> > > > > Imagine this query:
> >
> > > > > Person.all().fetch(100)
> >
> > > > > Is the order of data in the datastore guaranteed, or can the order
> of
> > > > > the entities returned change as data is inserted?
> >
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