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23

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
17

Updating Entities

"); public static EntityManager employeeDB = emf.createEntityManager(); public static EntityManager ... EntityManagers were not communicating their changes to each other. Which is where my question comes in ... . That said - those updates take place within their respective EntityManager i.e. EmployeeOverview deals
17

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
16

Internal exception when updating date filed (TemporalType.DATE)

entityManagerFactory;         private EntityManager entityManager;         public DataManager(String ... (connectionString);             entityManager = entityManagerFactory.createEntityManager ... ) {             System.out.println("Set new birthday:" + newBirthday.toString());             try {                 entityManager
15

Performance in large transactions

.) Pseudocode for the fast and the slow solution FAST: for (i = 0; i <100; i ++) { EntityManager entityManager = getEntityManagerFactory().createEntityManager(); entityManager.setFlushMode(FlushModeType.AUTO); EntityTransaction transaction = entityManager.getTransaction
4

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
3

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
3

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
3

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
0

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

Getting Started

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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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