datanucleus

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DataNucleus Enhancer, JDO and Specifying Column Names

I\'m working with DataNucleus as part of a Google App Engine project and I\'m having a bit of trouble with columns in persistence.[详细]

2022-12-21 16:13 分类：问答
Google App Engine - can't operate on multiple entity groups in a single transaction

Why am I receiving the exception below if the type of both entities is PersistentLogin? I thought that would mean they are in the same entity group, but I guess that is an incorrect assumption. Any id[详细]

2022-12-20 22:02 分类：问答
Google App Engine - org.datanucleus.exceptions.NucleusUserException: Object Manager has been closed

Why does the code below result in org.datanucleus.exceptions.NucleusUserException: Object Manager has been closed? The exception appears to be thrown at query.getResultList().[详细]

2022-12-20 20:27 分类：问答
How to activate datanucleus java-type extensions for JPA?

I have a simple JPA @Entity that has a property of type java.util.Locale. When I try and persist this, I get the following error:[详细]

2022-12-20 17:59 分类：问答
Entity to DTO conversion with JPA

I\'m using DataNucleus as a JPA implementation to store my classes in my web application.I use a set of converters which all have toDTO() and fromDTO().[详细]

2022-12-20 00:52 分类：问答
Appengine jdoconfig.xml for local database

Has anyone successfully configured JDO datanucleus default to google app engine to work on a local database?[详细]

2022-12-15 20:46 分类：问答
Datanucleus/JDO Level 2 Cache on Google App Engine

Is it possible (and does it make sense) to use the JDO Level 2 Cache for the Google App Engine Datastore?[详细]

2022-12-15 19:04 分类：问答
getObjectsById on App Engine

According to JDO, you can use PersistenceManager.getObjectsById to load mult开发者_C百科iple entity instances by their object id.[详细]

2022-12-15 13:00 分类：问答
example using memcache with jpa entitymanager on JGAE?

any example on using memcache/general 开发者_StackOverflow社区cache with jpa entitymanager on JGAE? or the only way to do it is manually put/set memcache on service layer?DataNucleus docs define adequ[详细]

2022-12-15 05:48 分类：问答
GAE,can persist but cannot load(createQuery) entity

1.i able to persist entity, and in _admin , i able to see key, id/name. total 6 results. but why it not show all the property inside my entity class?[详细]

2022-12-15 00:26 分类：问答