ejava.examples.daoex.dao

Class JPABookDAOImpl

java.lang.Object

ejava.examples.daoex.dao.JPABookDAOImpl

All Implemented Interfaces:

BookDAO

public class JPABookDAOImpl
extends Object
implements BookDAO

This class provides a simple DAO implementation based on JPA

Field Summary

Fields

Modifier and Type	Field and Description
private EntityManager	em

Constructor Summary

Constructors

Constructor and Description
JPABookDAOImpl()

Method Summary

Modifier and Type	Method and Description
Book	create(Book book) Add the book to the database.
List<Book>	findAll(int offset, int limit) Returns a collection of books, starting at the index provided and limiting the collection to the count value.
Book	get(long id) Gets a book from the database by its ID.
void	remove(Book book) Removes a book from the database.
void	setEntityManager(EntityManager em)
Book	update(Book book) Updates the book in the database with the values in this object.

Methods inherited from class java.lang.Object

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

Field Detail

em

private EntityManager em

Constructor Detail

JPABookDAOImpl

public JPABookDAOImpl()

Method Detail

setEntityManager

public void setEntityManager(EntityManager em)

create

public Book create(Book book)

Description copied from interface: BookDAO

Add the book to the database.

Specified by:

create in interface BookDAO

update

public Book update(Book book)

Description copied from interface: BookDAO

Updates the book in the database with the values in this object.

Specified by:

update in interface BookDAO

get

public Book get(long id)

Description copied from interface: BookDAO

Gets a book from the database by its ID.

Specified by:

get in interface BookDAO

remove

public void remove(Book book)

Description copied from interface: BookDAO

Removes a book from the database.

Specified by:

remove in interface BookDAO

findAll

public List<Book> findAll(int offset,
                          int limit)

Description copied from interface: BookDAO

Returns a collection of books, starting at the index provided and limiting the collection to the count value.

Specified by:

findAll in interface BookDAO