Fast Object Database for Java - with JPA/JDO support

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81

Detached Entity Objects

the database unless modified detached objects are merged back into an EntityManager to become managed ... invocation of rollback or by a commit failure. Explicit Merge Detached objects can be attached to any EntityManager by using the merge method: em.merge(employee); The content of the specified
69

merge(entity)

Method javax.persistence.EntityManager T merge( T entity ) Merge the state of the given entity into the current persistence context. Parameters: entity - entity instance Returns: the managed instance that the state was merged to Throws: IllegalArgumentException - if instance is not an entity or
68

CascadeType.MERGE

Enum Constant javax.persistence.CascadeType MERGE Cascade merge operation Since: JPA 1.0
32

Advanced JPA Topics

Describes advanced JPA topics - detached entity objects, lock management and entity lifecycle events.
29

Selective merge/cascade of detatched entity

Company. Each salesman is given many numerical targets for the new company. I then need to merge each ... ); for (Salesman s : salesmen) em.merge(s); This appears to have the effect of checking and merging ... objects attached to each Salesman, and each Salesman has hundreds of targets for each Company, this merge
26

Merge Issue: Attempt to reuse an existing primary key value

a feature on an ordinary merge operation. This is the test case ( work in 2.4.6 version ) : 2 parents ... ");         EntityManager em = null ;         // Merge parent1         em = emf ... ("child1"));         em.merge(e1);         em.getTransaction().commit();         em.clear
25

Extra uninitialised entities spawned on merge()

_MERGE = true;     /**      * @param args the command line arguments      */     public static ... );                 if (DO_PERSIST_BEFORE_MERGE) {             em.getTransaction().begin();             em.persist(e ... ();         em.merge(root);         em.getTransaction().commit();         TypedQuery query = em
25

Merge on detached entities

Hello, it is possible to merge detached entities? There are some attached entities which load from ... the fields of the detached entities will be changed and a merge by em.merge(entity) will be saved the entities. Can this works correctly? How are the rules of the merge process? Do the changed fields
24

Cascading merge() leading to "Attempt to persist a reference to a non managed instance" error

with a parent/child relationship and cascading merge() operations. The parent has an application defined id ... ();     tx.begin();     em.merge(new Child(new Parent("Joe")));     em.merge(new Child(new Parent("Tim ... . Cascading merge to new entity objects (the Parent instances in your code) is currently broken
24

EntityManager.merge gives EntityNotFoundException

Just started using objectdb (2.3.4). Calling EntityManager.merge for a new (non-managed) object ... .EntityNotFoundException Entity is not found: classdb.Test#'id' (error 631) at com.objectdb.jpa.EMImpl.merge(EMImpl.java:456) at classdb.Test.main(Test.java:32) thepigs Matt Pepar You are right, merging non

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ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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