About modify

forum_thread

Run out of memory

Hi, I've been looking into ObjectDB for our use, where everything has been great apart from I'm stuck on the following problem.   I am trying to load a large file (> 1GB), process certain information and store it back in the database to access / modify later. I require to be able to rollback changes as well, where there can be massive amount of changes.   ... information and store it back in the database to access / modify later. I require to be able to rollback changes as well, where there can ...

 
forum_thread

Retrieval by Access bug?

Dear Sirs, I have an object A, that has a OneToMany FetchType.EAGER List of objects B, that has a field with a reference to an object C. I have this code: ClassA objectA = em.find(ClassA.class, 1); for (ClassB objectB : objectA.getListB()) {     ClassC objectC = objectB.getObjectC(); } em is an open Entity Manager with a running transaction. ... that code, I received a managed objectC reference, I can modify objectC, and it is updated when I commit the transaction without any ...

 
manual

Deleting JPA Entity Objects

Explains how to use JPA to delete (remove) entity objects from the database.... when remove is called because operations that modify the database require an active transaction. Cascading Remove ...

 
api-jdo

javax.jdo.spi.JDOPermission

The JDOPermission class is for operations that are reserved for JDO implementations and should not be called by other code.(Class of JDO)

 
api-jdo

javax.jdo.listener.LoadCallback

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

 
api-jpa

having(restriction)

Specify a restriction over the groups of the query.(Method of javax.persistence.criteria.CriteriaQuery)

 
api-jdo

postDirty(event)

Invoked whenever a persistent instance is first made dirty, during an operation that modifies the value of a persistent or transactional field.(Method of javax.jdo.listener.DirtyLifecycleListener)

 
api-jpa

multiselect(selectionList)

Specify the selection items that are to be returned in the query result.(Method of javax.persistence.criteria.CriteriaQuery<T>)

 
api-jdo

getFetchGroups()

Get a modifiable Set containing a mutable copy of all currently active (in scope) fetch groups.(Method of javax.jdo.PersistenceManagerFactory)

 
api-jdo

setByteField(pc, field, currentValue, newValue)

Mark the field as modified by the user.(Method of javax.jdo.spi.StateManager)