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forum_thread

Optimistic lock

Hello When I get an optimistic lock on an object, refresh(), start trans and persist?  Will the changes made to the object before the violation be retained or must they be duplicated in the retry code?  Assuming it affects only one object.  tia. #1 2015-02-12 20:31 Hello When I get an optimistic lock on an object, refresh(), start trans and persist?  Will the chan ...

 
forum_thread

How storage works?

I have one Class Car that contains a ArrayList of Wheels. I have already one Car with 4 Wheels attached stored in the DB. If I update my Car adding a new Wheel object is all the Car updated? Or only changed part is updated? By other words, If I have one complex data model and only one part is changed, the Object DB stored the all complex data model or only the changed part? Thanks ... If you update a complex object model - only modified entity objects are stored by ObjectDB again. When an element ...

 
forum_thread

WORM (Write once read many) support

Hello, we would like to propose a feature in the objectdb if this is not already available. We use objectdb in our product development and deployment in high secure environments like police, military and government agencies. We have developed a specialized hardware device in a form of appliance which acts as archiving device for processing and storing logs, records and transactions. Hardware is specific in a way that it has a mechanism for preventing the data to be changed once they are written. ... are written. Our questions is, can objectdb be modified to work on such a storage device, ie. hard drive which is a WORM ...

 
api-jpa

orderBy(o)

Specify the ordering expressions that are used to order the query results.(Method of javax.persistence.criteria.CriteriaQuery)

 
api-jpa

groupBy(grouping)

Specify the expressions that are used to form groups over the subquery results.(Method of javax.persistence.criteria.Subquery)

 
api-jdo

jdoPostLoad()

Called after the values are loaded from the data store into this instance.(Method of javax.jdo.listener.LoadCallback)

 
api-jpa

groupBy(grouping)

Specify the expressions that are used to form groups over the query results.(Method of javax.persistence.criteria.CriteriaQuery)

 
api-jdo

javax.jdo.listener.ClearCallback

This interface is used to notify instances of clear events.(Interface of JDO)

 
forum_thread

Primary key generation problem after changing entity package

Hi, I changed package name for some of my entities in database. I added info in <schema><package... /></schema> of my configuration file - and the changes have been succesfully made in database. Unfortunately, sequences have been probably lost for changed entity classes. After schema change I keep getting errors : Attempt to reuse an existing primary key value... My primary keys are annotated as shown below : #1 2012-03-14 09:42 Hi, I changed package name for some of my entities in database. I added info in <schema><package ...

 
api-jdo

retrieveAll(pcs, useFetchPlan)

Retrieve field values of instances from the store.(Method of javax.jdo.PersistenceManager)