About EntityManager

101-110 of 200Refresh
Manual
9

JPA Named Queries

at runtime by the same Query and TypedQuery interfaces but different EntityManager factory methods
JPA Doc
9

javax.persistence.EntityNotFoundException

EntityManager.getReference is accessed but the entity does not exist. Thrown when EntityManager.refresh is called and the object no longer exists in the database. Thrown when EntityManager.lock is used ... , if one is active, will be marked for rollback. Since: JPA 1.0 See Also: EntityManager.getReference
JDO Doc
8

javax.jdo.JDOEntityManager

javax.jdo Interface JDOEntityManager Superinterfaces: EntityManager, PersistenceManager Since: JDO ... getDelegate() Return the underlying provider object for the EntityManager, if available. Return the underlying provider object for the EntityManager, if available. The result of this method is implementation
JPA Doc
8

javax.persistence.EntityManagerFactory

: IllegalStateException - if the entity manager factory has been closed Since: JPA 1.0 EntityManager createEntityManager() Create a new application-managed EntityManager. Create a new application-managed EntityManager. This method returns a new EntityManager instance each time it is invoked. The isOpen
Forum
6

Is it possible to remove parent/child entities without refresh?

We have a big entity object tree in our project. If I use the entityManager.remove(childEntity) method to remove a child entity a entityManager.refresh(parentEntity) is necessary in order to have an updated parent/child object tree in memory. But entityManager.refresh is too slow for our project
JPA Doc
5

javax.persistence.OptimisticLockException

, if one is active, will be marked for rollback. Since: JPA 1.0 See Also: EntityManager.find(Class, Object, LockModeType) EntityManager.find(Class, Object, LockModeType, java.util.Map) EntityManager.lock(Object, LockModeType) EntityManager.lock(Object, LockModeType, java.util.Map
JPA Doc
5

createEntityManager()

Method javax.persistence.EntityManagerFactory EntityManager createEntityManager() Create a new application-managed EntityManager. This method returns a new EntityManager instance each time it is invoked. The isOpen method will return true on the returned instance. Returns: entity manager instance
JPA Doc
5

createEntityManager(map)

Method javax.persistence.EntityManagerFactory EntityManager createEntityManager(   Map map ) Create a new application-managed EntityManager with the specified Map of properties. This method returns a new EntityManager instance each time it is invoked. The isOpen method will return true
JPA Doc
5

javax.persistence.NamedQuery

EntityManager em; ... customers = em.createNamedQuery("findAllCustomersWithName ... with the EntityManager methods that create query objects. (Required) The name used to refer to the query with the EntityManager methods that create query objects. Since: JPA 1.0 String query (Required) The query
Forum
4

Merge with Parent/Child entities not possible

javax.persistence.Entity; import javax.persistence.EntityManager; import javax.persistence ... id) {    this.id = id;   } } private EntityManager createEntityManager(String dbFileName ... ("objectdb:" + dbFileName);   EntityManager entityManager = emf.createEntityManager