Suppose I have class A with fields @Persistent int id
@Persistent String name @Persistent int age This class gets deployed (Version 1) to App Engine and data gets persisted to the datastore. I then modify class A by adding a new field. @Persistent address. and then deployed the new version (Version 2) to App Engine and data gets persisted to the datastore. Finally I modified class A again by removing the age field and I again deployed the new version (Version 3) to App Engine. Summary, the initial deployment, Version 1, had Class A. The second deployment, Version 2, I added a new field, address. The third deployment, Version 3, I deleted the 'age' field. In a typical database, when I add a new column, it typically defaults to null or 0 and when I delete a column, the data gets deleted. Then I update my SQL statements to take into account the deleted and new columns. My Question ... When I try to query the datastore in the third deployment, will I be able to get back the data which was stored in the first and second deployments? Does DataNucleus know that fields were adding/deleted? What happens to those orphaned fields, for example Version 3 of my app got rid of the 'age' field but I'm assuming that data is still in the datastore? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" 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?hl=en -~----------~----~----~----~------~----~------~--~---
