org.exoplatform.commons.api.persistence

Interface GenericDAO<E,ID extends Serializable>

Type Parameters:

E - Entity type

ID - Identity of the entity

public interface GenericDAO<E,ID extends Serializable>

Version:

$Revision$

Author:

Trong Tran

Method Summary

Modifier and Type	Method and Description
Long	count() Get the number of entities with the specified type and id from the datasource.
E	create(E entity) Insert a new entity.
void	createAll(List<E> entities) Insert a list of new entities in the persistence context.
void	delete(E entity) Delete the specified entity from the persistence context.
void	deleteAll() Remove all of the entities from the persistence context.
void	deleteAll(List<E> entities) Remove all of the specified entities from the persistence context.
E	find(ID id) Return an entity which is associated with specified id.
List<E>	findAll() Get a list of all object of the specified type from the datasource.
E	update(E entity) Update the entity in the persistence context.
void	updateAll(List<E> entities) Update the entity in the persistence context.

Method Detail

count

Long count()

Get the number of entities with the specified type and id from the datasource.

Returns:

the entity, null if none is found

find

E find(ID id)

Return an entity which is associated with specified id.

Returns:

an entity. Otherwise, return NULL.

findAll

List<E> findAll()

Get a list of all object of the specified type from the datasource.

Returns:

a list of entities

create

E create(E entity)

Insert a new entity. If the entity already exist, use update(E entity) instead

Returns:

the new entity

createAll

void createAll(List<E> entities)

Insert a list of new entities in the persistence context. If the entities already exist, use update(E entity) instead

update

E update(E entity)

Update the entity in the persistence context. If the entity does not already exist, use create(E entity) instead

Returns:

the just created entity

updateAll

void updateAll(List<E> entities)

Update the entity in the persistence context. If the entity does not already exist, use create(E entity) instead

delete

void delete(E entity)

Delete the specified entity from the persistence context.

deleteAll

void deleteAll(List<E> entities)

Remove all of the specified entities from the persistence context.

deleteAll

void deleteAll()

Remove all of the entities from the persistence context.