11 | Should derived fields of an EmbeddedId be manually maintained by app code?.Entity; import javax.persistence.EntityManager; import javax.persistence.FlushModeType; import ... static EContainer getInstance(EntityManager em) { EContainer c = em.find(EContainer.class, "1 ... , EntityManager em) throws TestException { if (lastInstanceInMap == null) { lastInstanceInMap = 0 |
10 | Insertion Speed Rate and Batch Load This test from the Memory Leak thread uses a separate transaction, and moreover, a new EntityManager per stored entity object. A batch load should reuse the EntityManager and persist a large number ... = Persistence.createEntityManagerFactory("$objectdb/db/speed.odb"); EntityManager |
2 | javax.persistence.PessimisticLockScope of the EntityManager, Query, and TypedQuery interfaces that allow lock modes to be specified or used |
2 | createEntityManagerFactory(persistenceUnitName, properties) that creates EntityManagers configured according to the specified persistence unit. Since: JPA 1.0 |
2 | createEntityManagerFactory(persistenceUnitName) EntityManagers configured according to the specified persistence unit Since: JPA 1.0 |
2 | NamedQuery.nameAnnotation Element javax.persistence.NamedQuery String name (Required) The name used to refer to the query with the EntityManager methods that create query objects. Since: JPA 1.0 |
2 | javax.persistence.EntityTransactionjavax.persistence Interface EntityTransaction Interface used to control transactions on resource-local entity managers. The EntityManager.getTransaction() method returns the EntityTransaction interface. Since: JPA 1.0 Learn how to use EntityTransaction in Chapter 3 of the ObjectDB/JPA manual. void |
2 | Best practise loading big data this MyStepBlockCollection sbc = entityManager.find(id); for (MyStepBlock sb : sbc.stepBlocks ... above: MyStepBlockCollection sbc = entityManager.find(id); for (MyStepBlock sb : sbc.stepBlocks) { for (MyStep s : sb ... .Embeddable; import javax.persistence.Entity; import javax.persistence.EntityManager; import javax |
2 | javax.persistence.PersistenceContextjavax.persistence Annotation PersistenceContext Target: Classes and fields (including property get methods) Expresses a dependency on a container-managed EntityManager and its associated persistence context. Since: JPA 1.0 String name (Optional) The name by which the entity manager |
2 | javax.persistence.LockModeType.persistence.EntityManager methods that take locks ( lock, find, or refresh) or to the Query |
