87 words
merge(entity) - JPA EntityManager's method
Methodjavax.persistence.EntityManager
T merge(
T entity
)
Merge the state of the given entity into the
current persistence context.
- Parameters:
entity- entity instance
- Returns:
- the managed instance that the state was merged to
- Throws:
IllegalArgumentException- if instance is not an entity or is a removed entityTransactionRequiredException- if invoked on a container-managed entity manager of typePersistenceContextType.TRANSACTIONand there is no transaction
- Since:
- JPA 1.0
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.
