65 words
getIdentifier(entity) - JPA PersistenceUnitUtil's method
Methodjavax.persistence.PersistenceUnitUtil
Object getIdentifier(
Object entity
)
Return the id of the 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
- Returns:
- id of the entity
- Throws:
IllegalArgumentException- if the object is found not to be an entity
- 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.
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.
Which JPA is Faster?
See a comparison of Hibernate, EclipseLink, OpenJPA, DataNucleus, MySQL, PostgreSQL, Derby, HSQLDB, DB4O by Versant, H2 Database, SQLite and ObjectDB
in the JPA Benchmark.
