org.springframework.data.repository
Interface Repository<T,ID extends Serializable>

All Known Subinterfaces:

PagingAndSortingRepository<T,ID>

All Known Implementing Classes:

RepositorySupport

public interface Repository<T,ID extends Serializable>

Interface for generic CRUD operations on a repository for a specific type.

Author:

Oliver Gierke, Eberhard Wolff

Method Summary

Long	count() Returns the number of entities available.
void	delete(Iterable<? extends T> entities) Deletes the given entities.
void	delete(T entity) Deletes a given entity.
void	deleteAll() Deletes all entities managed by the repository.
boolean	exists(ID id) Returns whether an entity with the given id exists.
List<T>	findAll() Returns all instances of the type.
T	findById(ID id) Retrives an entity by its primary key.
List<T>	save(Iterable<? extends T> entities) Saves all given entities.
T	save(T entity) Saves a given entity.

Method Detail

save

T save(T entity)

Saves a given entity. Use the returned instance for further operations as the save operation might have changed the entity instance completely.

Parameters:

entity -

Returns:

the saved entity

save

List<T> save(Iterable<? extends T> entities)

Saves all given entities.

Parameters:

entities -

Returns:

findById

T findById(ID id)

Retrives an entity by its primary key.

Parameters:

id -

Returns:

the entity with the given primary key or null if none found

Throws:

IllegalArgumentException - if primaryKey is null

exists

boolean exists(ID id)

Returns whether an entity with the given id exists.

Parameters:

id -

Returns:

true if an entity with the given id exists, alse otherwise

Throws:

IllegalArgumentException - if primaryKey is null

findAll

List<T> findAll()

Returns all instances of the type.

Returns:

all entities

count

Long count()

Returns the number of entities available.

Returns:

the number of entities

delete

void delete(T entity)

Deletes a given entity.

Parameters:

entity -

delete

void delete(Iterable<? extends T> entities)

Deletes the given entities.

Parameters:

entities -

deleteAll

void deleteAll()

Deletes all entities managed by the repository.