jdo

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Appengine: DatastoreNeedIndexException when using "order by"

Hello I have this DatastoreNeedIndexException when I try to order by my query. here is the code: @PersistenceCapable[详细]

2023-02-28 02:01 分类：问答
Getting an element by id in Google App Engine's JDO

I have a problem when trying to find a single element by id. The entity class is this: @PersistenceCapable(identityType = IdentityType.APPLICATION)[详细]

2023-02-26 20:28 分类：问答
Queries without extra index in GAE

In a Google App Engine Application (GAE/Java) I have a class like this one: public class Person{ private int born;[详细]

2023-02-25 18:19 分类：问答
Similar Feature like EclipseLink Flex Extensions in other Persistence Frameworks?

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.[详细]

2023-02-23 03:31 分类：问答
Help with storing object keys in a session using JDO/App Engine

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?[详细]

2023-02-22 16:48 分类：问答
JDO - Updating a One-to-one child

I have a Recipe. Each Recipe has an image. So my entity looks something like @PersistenceCapable public class Recipe {[详细]

2023-02-22 14:46 分类：问答
Holding different instances of the same class in GAE Datastore

Extremly confusing title, i know. Hello, i am facing some funky issues here. I have a property-class, like this[详细]

2023-02-21 20:32 分类：问答
Datamodel sample for google app engine using JDO

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[详细]

2023-02-21 20:31 分类：问答
In AppEngine (JDO), what is the difference between equality (==) of an item with list and contains() function?

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);?[详细]

2023-02-19 20:36 分类：问答
Google App Engine Error: No matching index found. (Java)

I am writing a query but it always says \"No matching index found\". I don\'t know why. My code is as below:[详细]

2023-02-19 07:37 分类：问答