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Persisting collection where members are subclasses

(f.getChildren()); entityManager.getTransaction().begin(); entryDao.makePersistent(f ... ;    em.getTransaction().begin();         em

multiple LEFT JOINs do not work as expected

.createEntityManager();         em.getTransaction().begin();   ... "); EntityManager em = emf.createEntityManager(); em.getTransaction().begin

OutofMemory error with Object DB 2.0

to begin the transaction. With objectdb 2.x do we need to close the PersistentManager ... ;          transaction.begin();    

java.lang.UnsupportedOperationException

class="pre-java"> List results = query.getResultList(); em.getTransaction().begin(); for (Object ... .getTransaction().begin(); em.unwrap(PersistenceManager.class).newQuery(License.class).deletePersistentAll(); em

Updating existing persistence entries

. Of course, you have to begin and commit a transaction (when SAVE is selected). If a thank you very much, for the explanation. I managed to get it working with beginning

Entity Update - Is the documentation up to date?

subsequently begin and commit a transaction, all my changes seem to be merged automatically. begin and commit a transaction, all my changes seem to be merged

@Unique member combination not working

;        em.getTransaction().begin();      ... ;             em.getTransaction().begin

EntityManagerFactory Fails To Swtich Over To Slave When Master Is Unavailable

;  em.getTransaction().begin();    for (int i = 0; i < 1000; i++) {    ... ) {   if (WRITE_DATA_TO_DATABASE) {    em.getTransaction().begin();    for (int

Using the wrong class to access a database

em) { em.getTransaction().begin(); for (int i = 0; i < 1000; i++) { Point p = new ... = query.getResultList(); em.getTransaction().begin(); for (Point p : results) { if (p.getX

Issues with JDO Casting & Full Qualified Names

.getTransaction().begin();   MyEntity entity = new MyEntity();   entity.embeddeds.put("test ... ;       em.getTransaction().begin();