Google app engine JDO data store design using inheritance

I am using subtable inheritance strategy to design my data store using JDO for my application hosted in google app engine. There are three types of users tha开发者_JAVA技巧t can logs into my app. these are the classes that I designed for this purpose 1) User(Abstract) 2)UserType1 extends User 3) UserType2 extends User 4) UserType3 extends User. Now the problem is every time I want to find an user based on the userId I have to check each entity kind separatly. It will become more problem when the user types increases. Please help how to design the model classes in this scenario.

Thanks

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you're looking for JDO2's superclass-table inheritance technique. it works similar to the python app engine PolyModel class.

unfortunately, app engine doesn't support superclass-table right now. instead, consider consolidating all of the different class's fields into a single User class with a type enum.