I am trying to follow the DataNucleus tutorial for JDO. I am using Maven and I have followed the instructions available here for the enhancer.
I\'m developing a Googl开发者_开发问答e App Engine Java app where users can search business objects from database based on search criteria.
I\'m facing a little problem of scalabi开发者_高级运维lity. I\'m using JDO to query my datastore.
I need to collect some statistics on my entities in the datastore. As an example, I need to know how many objects of a kind I have, how
Here is my testing app: http://caoscoding.appspot.com login: admin pass: test Is an simple app where you insert some data and get开发者_如何学JAVA out a table, of that data, that\'s all.
I\'ve implemented store_mapping extension but it currently uses ObjectAsStringMapping. As a result I can read array values from database but any insert or update causes underlying postgresql driver er
When I look under http://localhost:8888/_ah/admin/ I can see that every entry in datastore has an ID/Name field. I also know that I can get objects with this id using persistenceManager.getObject(claz
I have been using the Master/Slave database for previous App Engine projects but my new app is defined as High Replication Datastore (I don\'t believe this setting can be changed after it is defined).
I am using DataNucleus with HBase. I had a table user. It contained 4 rows. Now I added a new column to the table. Now everytime I access any old user object which does not have this column DataNucleu
I have two classes: public class Dog { 开发者_如何学JAVA@PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
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