I’m new to object oriented database designs and I’m trying to understand how I should be structuring my classes in JDO for google app engine, particularly one to many relationships.
I\'m hoping someone\'s seen this. I\'ve f开发者_如何学Pythonound no clues on Google. I\'m using Google AppEngine with JDO to persist my objects.
I am experimenting with App engine. One of my stumbling blocks has been the support for managed relations or lack there off, this is further compounded by the lack of join support.
this seems really simple but I haven\'t gotten this to work. I am building my app with grails on google app engine. This pretty much requires you to use JDO.
How do i add a record to a child entity in the example below ? For example i have a Employee Record which i开发者_如何学JAVAs name is \"Sam\". how do i add 2 street adress for sam ?
I\'ve run into the \"can\'t operate on multiple entity groups in a single transaction.\" problemwhen using APPENGINE FOR JAVA w/ JDO 开发者_Python百科with the following code:
Perhaps i\'m wandering down the wrong path - I\'m looking for a tool like hbm2ddl. I currently have domain model (pojos with JDO annotations) - I need to setup t开发者_如何学Pythonhe database.
I am running a GWT Web Application proje开发者_运维知识库ct in Eclipse with certain Entities that I make persisent using JDO. Where (on my file system) do these Entities actually get saved if I run th
I\'m switching from Scala 2.7.7 to Scala 2.8.0RC3 and now a few of my classes don\'t compile anymore. The problem is in the @PersistentCapable annotation:
When querying with JDOQL is there a performance difference between using the declarative version a开发者_Go百科nd the Single-String version:
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