Hello I have this DatastoreNeedIndexException when I try to order by my query. here is the code: @PersistenceCapable
I have a problem when trying to find a single element by id. The entity class is this: @PersistenceCapable(identityType = IdentityType.APPLICATION)
In a Google App Engine Application (GAE/Java) I have a class like this one: public class Person{ private int born;
I have the need to be able to a开发者_如何学JAVAdd additional columns to database tables in a Java JSF, JPA (JDO) application.
I\'m new to JDO/App Engine and looking for some help with storing keys of objects in my current session. I\'ve created the following class and would like to access this key in another class?
I have a Recipe. Each Recipe has an image. So my entity looks something like @PersistenceCapable public class Recipe {
Extremly confusing title, i know. Hello, i am facing some funky issues here. I have a property-class, like this
I have been trying to learn and creating a sample project using GWT/GAE/GoogleDatastore. Am just trying to figure out what would be the best way to design the data model for a learning management sys
For example, if I have: List A; and a String B; What is the difference, in JDO (AppEngine), between the following two conditions in a query: B == A; and A.contains(B);?
I am writing a query but it always says \"No matching index found\". I don\'t know why. My code is as below:
加载中,请稍侯......