jdo

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Keep transaction between JDO and low-level API

I have a Spring application in GoogleApp engine which uses JDO to persists objects. So I\'m using it in this way in my service layer to keep transactions (with @Transactional annotation).[详细]

2023-02-19 05:03 分类：问答
App Engine unencoded String as key -- is there an upper bound on the string length?

Suppose we have a JDO entity that uses an unencoded string as the PrimaryKey.Is there some practical limit 开发者_JAVA百科on the size that this unencoded string could be? Specifically, I\'m wondering[详细]

2023-02-19 02:27 分类：问答
Two different methods for Google App Engine Datastore Transactions -- which to use?

There are two different ways to perform transactions (JDO) in the App Engine datastore. Method 1: Use PersistenceManager[详细]

2023-02-18 02:19 分类：问答
JDO GAE One-to-Many problem

Hi i am having some problems retreiving data from the datastore... I have a few circuses, who has some amount of attractions.[详细]

2023-02-17 23:33 分类：问答
Key or Long for ID in Google App Engine (JDO)

I\'m using JDO with Google App Engine for storage and I\'m wondering what is the difference between the Key object and Long for id?[详细]

2023-02-17 11:05 分类：问答
JDO Relationships - App Engine

I\'d like to implement a simple category system for my recipes. Here\'s my Recipe entity: @PersistenceCapable[详细]

2023-02-17 01:21 分类：问答
JDO query with base class gives null pointer

I am getting this error when running junit test Testcase: testGet_User(Authentication.UserManagerTest):Caused an ERROR[详细]

2023-02-16 16:53 分类：问答
Is there a significant difference in performance between low-level datastore API and JDO/JPA?

Should I expect a noticeable performance boost after switching from JDO/JPA to low开发者_C百科-level datastore API? Also, are there any things I should be aware of before switching?The difference is s[详细]

2023-02-15 09:49 分类：问答
High Level Java Client selection for Apache Cassandra [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers.[详细]

2023-02-15 07:24 分类：问答
Google App Engine JDO Persistence Manager and 500 server error

I keep getting a 500 error everytime to run my service, since the google message tells mme almost nothing i began uploading the service and commenting parts out. It seems to work fine with out using t[详细]

2023-02-15 00:05 分类：问答