89 | EntityManager refresh problemHi, in the following code you can see an example with EntityManager.refresh(). The example throws ... -------------------- package example; import java.io.File; import javax.persistence.EntityManager; import ... void refreshTest() { EntityManager entityManager = null; try |
27 | Working with JPA Entity Objects this state the object is not yet associated with an EntityManager and has no representation in ... via an EntityManager’s persist method, which must be invoked within an active transaction. On transaction commit, the owning EntityManager stores the new entity object to the database. More details on storing objects |
25 | Updating JPA Entity Objects entity object from within an active transaction. No EntityManager's method is invoked to report |
21 | Setting and Tuning of JPA Queries on which they were invoked). Flush Mode (setFlushMode) Changes made to a database using an EntityManager ... of other EntityManager instances). JPA implementations can easily make uncommitted changes visible in ... the application, either at the EntityManager level as a default for all the queries in that EntityManager |
20 | CRUD Database Operations with JPAGiven an EntityManager, em, that represents a JPA connection to the object database, we can use ... an ordinary Java object. It then becomes associated with an EntityManager and with its transaction (as ... can become productive very quickly. The EntityManager object serves as the factory for Query instances |
20 | Shared (L2) Entity CacheEvery EntityManager owns a persistence context, which is a collection of all the entity objects ... an entity object that is already managed by the EntityManager returns the existing instance from ... is one EntityManager. This section describes a level 2 (L2) cache of entity objects, which is managed |
18 | CRUD Operations with JPAExplains how to use JPA for CRUD database operations (persist, retrieve, update, remove). |
18 | Deleting JPA Entity ObjectsExplains how to use JPA to delete (remove) entity objects from the database. |
18 | Chapter 3 - Using JPAExplains how to store, retrieve, update and delete entity objects using JPA. |
18 | JPA Reference (JavaDoc)Java/JPA API Reference (based on the JPA 3 JavaDoc) |
