Thanks for this. But is there a way to get a specific entity using the
"ID/Name" value generated by the data-store?
On Wed, Apr 6, 2011 at 8:19 AM, Ian Marshall <ianmarshall...@gmail.com> wrote:
> I use the following code to define my persistent entity classes in
> JDO.
>
> I have find my persistent entities by encoded key string or ID - my
> choice.
>
> Enjoy?
>
> @PersistenceCapable(identityType = IdentityType.APPLICATION,
> detachable = "true")
> public class MyPersistentClass implements Serializable
> {
> private static final long serialVersionUID = 1L;
>
> @PrimaryKey
> @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> @Extension(vendorName="datanucleus", key="gae.encoded-pk",
> value="true")
> private String sEncodedKey;
>
> @Persistent
> @Extension(vendorName="datanucleus", key="gae.pk-id", value="true")
> private Long loID;
>
> //
> // Other persistent data members...
> //
>
> public String getEncodedKey()
> {
> return sEncodedKey;
> }
>
> public Long getID()
> {
> return loID;
> }
>
> //
> // Getter and setter methods for
> // the other persistent data members...
> //
> }
>
>
> On Apr 5, 3:44 pm, Luca Matteis <lmatt...@gmail.com> wrote:
>> To identify my JDO objects in Google App Engine I use the Key type. It
>> works fine but when I need to pass this through urls it gets sort of
>> long.
>>
>> For
>> example:http://mysite.com/user/aghtaWx1LWFwcHIZCxIGTXlVc2VyGAMMCxIHTXlJbWFnZR...
>>
>> When viewing my entities in my admin viewer I can see that the
>> data-store also sets an "id" for my entity object, which seems to be
>> an incremental numeric value, which is quite short compared to the Key
>> string. Can I use this to grab information on my object? How do I do
>> this? I tried using getObjectbyId() with the id instead of the key...
>> it doesn't work.
>>
>> Also, should I be using a Long type to identify objects instead of Key types?
>
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