public Class JpaHelper

Create a EclipseLink EMF given a ServerSession that has already been created and logged in.

Create a EclipseLink EMF using a session name and sessions.xml. This is equivalent to using the EclipseLink.session-xml and EclipseLink.session-name PU properties with the exception that no persistence.xml is required. The application would be required to manage this singleton EMF.

Create a EclipseLink JPA query dynamically given a EclipseLink query.

Access the internal EclipseLink query wrapped within the JPA query.

Retrieve the shared database session from the EMF.

Convert a JPA entityManager into a EclipseLink specific one. This will work both within a JavaSE deployment as well as within a container where the EntityManager may be wrapped. In the case where the container is not in a transaction it may return null for its delegate. When this happens the only way to access an EntityManager is to use the EntityManagerFactory to create a temporary one where the application manage its lifecycle.

Given a JPA EntityManagerFactory attempt to cast it to a EclipseLink EMF. Although this method currently returns an instance of EntityManagerFactoryImpl, it is recommended that users cast to JpaEntityManagerFactory. Future versions of EclipseLink will return that interface from this method instead

Annotations

@Deprecated

See Also

JpaEntityManagerFactory

Given a JPA EntityManagerFactory attempt to cast it to a EclipseLink EMF.

See Also

JpaEntityManagerFactory

Given an EntityManager return the EntityManagerFactory that created it. This method must be called on an open entity manager and will return null if called on a closed entityManager. This method will return null for non-EclipseLink EntityManagers.

See Also

JpaEntityManagerFactory

Access the internal EclipseLink query wrapped within the JPA query. A EclipseLink JPA created from JP QL only contains a ReadAllQuery if only a single entity type is being returned. A ReadAllQuery is the super class of a ReportQuery so this method will always work for either a ReportQuery or ReadAllQuery.

Access the internal EclipseLink query wrapped within the JPA query. A EclipseLink JPA created from JP QL contains a ReportQuery if multiple items or a non-entity type is being returned. This method will fail if a single entity type is being returned as the query is a ReadAllQuery.

See Also

JpaHelper#getReadAllQuery

Retrieve the shared server session from the EMF.

Retrieve the shared session broker from the EMF.

Verify if the JPA provider is EclipseLink. If you are in a container and not in a transaction this method may incorrectly return false. It is always more reliable to check isEclipseLink on the EMF or Query.

Verify if the JPA provider is EclipseLink

Verify if the JPA provider is EclipseLink

Determine if the JPA query is a EclipseLink ReportQuery. Useful for frameworks that want to determine which get_X_Query method they can safely invoke.

If the object has a fetch group then the whole object is read in.