ejava.examples.daoex.jpa

Class JPAAuthorDAO

java.lang.Object

ejava.examples.daoex.jpa.JPAAuthorDAO

All Implemented Interfaces:

AuthorDAO

public class JPAAuthorDAO
extends Object
implements AuthorDAO

This class implements a DAO using javax.persistence.EntityManager. Most of the work of mapping the objects to the database is being performed in either the @Entity class or in a orm.xml descriptor file. The caller of this object must manage the transaction scope. The EntityManager is being injected into the DAO at the start of the overall transaction.

Author:

jcstaff $Id:$

Field Summary

Fields

Modifier and Type	Field and Description
private EntityManager	em
private static org.apache.commons.logging.Log	log_

Constructor Summary

Constructors

Constructor and Description
JPAAuthorDAO()

Method Summary

Modifier and Type	Method and Description
void	create(Author author)
Author	get(long id)
Author	getByQuery(long id)
void	remove(Author author)
void	setEntityManager(EntityManager em)
Author	update(Author author)
Author	updateByMerge(Author author)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

log_

private static org.apache.commons.logging.Log log_

em

private EntityManager em

Constructor Detail

JPAAuthorDAO

public JPAAuthorDAO()

Method Detail

setEntityManager

public void setEntityManager(EntityManager em)

create

public void create(Author author)

Specified by:

create in interface AuthorDAO

get

public Author get(long id)

Specified by:

get in interface AuthorDAO

getByQuery

public Author getByQuery(long id)

Specified by:

getByQuery in interface AuthorDAO

update

public Author update(Author author)

Specified by:

update in interface AuthorDAO

updateByMerge

public Author updateByMerge(Author author)

Specified by:

updateByMerge in interface AuthorDAO

remove

public void remove(Author author)

Specified by:

remove in interface AuthorDAO