About Persistence Context

11-20 of 200Refresh
Tutorial
31

Step 2: Entity Class and Persistence Unit

.Date; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; @Entity public class Guest implements Serializable { private static final long serialVersionUID = 1L; // Persistent Fields: @Id @GeneratedValue Long id
Manual
30

Shared (L2) Entity Cache

Every EntityManager owns a persistence context, which is a collection of all the entity objects that it manages. The persistence context serves as a first level cache. An attempt to retrieve ... the persistence context, rather than a new instantiated entity object. The scope of the persistence context
FAQ
28

What is the Java Persistence API (JPA)?

The Java Persistence API (JPA) is a standard API for accessing databases from within Java ... . Using plain old Java objects (POJO) to represent persistent data can significantly simplify database ... Persistence API (JPA). By interacting with ObjectDB using standard JPA you can keep your application
Manual
28

Retrieving JPA Entity Objects

of the database. The persistence context serves as a cache of retrieved entity objects. If a requested entity object is not found in the persistence context a new object is constructed and filled ... is then added to the persistence context as a managed entity object and returned to the application
JDO Doc
27

getPersistenceManagerFactory(jndiLocation, context)

 jndiLocation,   Context context ) Returns a PersistenceManagerFactory at the JNDI location specified by jndiLocation in the context context. If context is null, new InitialContext() will be used. This method is equivalent to invoking getPersistenceManagerFactory(String,Context,ClassLoader
Manual
27

Storing JPA Entity Objects

. Therefore, holding 1,000,000 managed Point instances in the persistence context might consume too much memory. The sample code above clears the persistence context after every 10,000 persists. Updates ... New entity objects can be stored in the database either explicitly by invoking the persist method
JDO Doc
27

getPersistenceManagerFactory(jndiLocation, context, loader)

 jndiLocation,   Context context,   ClassLoader loader ) Returns a PersistenceManagerFactory at the JNDI location specified by jndiLocation in the context context. If context is null, new ... the PersistenceManagerFactory context - the context in which to find the named PersistenceManagerFactory
Issue
25

objectdb-2.6.9_06: Extended Persistence Context fails: 'Attempt to begin a new transaction when a transaction is active'

with extended Persistence Context? [EDIT: 2006-09-29 New improved version of test mini web app with test mode ... () and has an entity manager with an extended persistence context. The basic idea (which used to work fine in practice ... persistence context entity manager is: @Stateful public class ExtProjectBuilder extends
JPA Doc
25

javax.persistence.PersistenceContext

PersistenceContextType type (Optional) Specifies whether a transaction-scoped persistence context or an extended persistence context is to be used. (Optional) Specifies whether a transaction-scoped persistence context or an extended persistence context is to be used. Default value: javax.persistence
Forum
24

How to Use a SF with extended Persistence Context?

Hey, I have a problem to use SF with an Extended Persistence Context Regarding to Transactions. The need for an extended persistence Context emerges for the need to create queries in advance for fast ... with an extended persistence context. the GuestServlet holds reference to a SL called GuestUpdater