206 words

javax.persistence.PersistenceUtil - JPA interface

javax.persistence
Interface PersistenceUtil

Subinterfaces:
PersistenceUnitUtil
Utility interface between the application and the persistence provider(s).

The PersistenceUtil interface instance obtained from the Persistence class is used to determine the load state of an entity or entity attribute regardless of which persistence provider in the environment created the entity.

Since:
JPA 2.0
boolean isLoaded(Object entity)
Determine the load state of an entity.
Determine the load state of an entity. This method can be used to determine the load state of an entity passed as a reference. An entity is considered loaded if all attributes for which FetchType.EAGER has been specified have been loaded.

The isLoaded(Object, String) method should be used to determine the load state of an attribute. Not doing so might lead to unintended loading of state.

Parameters:
entity - whose load state is to be determined
Returns:
false if the entity has not been loaded, else true
Since:
JPA 2.0
boolean isLoaded(Object entity, String attributeName)
Determine the load state of a given persistent attribute.
Determine the load state of a given persistent attribute.
Parameters:
entity - entity containing the attribute
attributeName - name of attribute whose load state is to be determined
Returns:
false if entity's state has not been loaded or if the attribute state has not been loaded, else true
Since:
JPA 2.0

This documentation page is derived (with some adjustments) from the open source JPA 2 RI (EclipseLink)
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
Object DB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.