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 <[email protected]> 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 <[email protected]> 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? > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
