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Online Backup

/EntityManager">EntityManager (em) that represents the connection (local or

ObjectDB Object Database Features

(per EntityManager). L2 shared entity data Online backup by a simple query on an EntityManager/PersistenceManager.

javax.persistence.OptimisticLockException

/EntityManager/find_Class__Object_LockModeType" title="Method of javax.persistence.EntityManager">EntityManager.find(Class, Object, LockModeType) EntityManager/find_Class__Object_LockModeType_Map_" title="Method of javax.persistence

FROM clause (JPQL / Criteria API)

/jpa/EntityManager/createQuery_String_Class_">createQuery("SELECT c FROM Country c", Country.class

JPA Reference (JavaDoc)

-book-toc path="api/java/jpa" select="Persistence|EntityManagerFactory|EntityManager|EntityTransaction

Step 4: Add a Servlet Class

)getServletContext().getAttribute("emf"); EntityManager em = emf.createEntityManager(); try ... > is retrieved from the application scope attribute, and then an EntityManager

Step 4: Add a Servlet Class

)getServletContext().getAttribute("emf"); EntityManager em = emf.createEntityManager(); try ... > is retrieved from the application scope attribute, and then an EntityManager

Step 6: Set the Spring XML

>EntityManager, to manage transactions and to look for JSP pages in the WEB-INF directory.

Step 6: Set the Spring XML

(for components, controllers and transactions), to inject a JPA EntityManager

Step 3: Add a Main Class

"); EntityManager em = emf.createEntityManager(); // Store 1000 Point objects in