PersistenceUnitUtil
- Super Interfaces:
PersistenceUtil
Utility interface between the application and the persistence provider managing the persistence unit.
The methods of this interface should only be invoked on entity instances obtained from or managed by entity managers for this persistence unit or on new entity instances.
- Since:
- JPA 2.0
Public Methods
Object getIdentifier(Object entity)
A generated id is not guaranteed to be available until after the database insert has occurred. Returns null if the entity does not yet have an id.
- Parameters:
entity
- entity instance
- Return:
- id of the entity
- Throws:
- IllegalArgumentException - if the object is found not to be an entity
- Since:
- JPA 2.0
boolean isLoaded(Object 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
- entity instance whose load state is to be determined
- Return:
- false if the entity has not been loaded, else true
- Since:
- JPA 2.0
boolean isLoaded(Object entity, String attributeName)
- Parameters:
entity
- entity instance containing the attributeattributeName
- name of attribute whose load state is to be determined
- Return:
- false if entity's state has not been loaded or if the attribute state has not been loaded, else true
- Since:
- JPA 2.0