de.alpharogroup.db.dao.api

Interface GenericDao<T extends BaseEntity<PK>,PK extends Serializable>

Type Parameters:

T - the type of the domain entity

PK - the type of the primary key from the domain entity

All Superinterfaces:

Serializable

All Known Subinterfaces:

EntityManagerDao<T,PK>, SessionFactoryDao<T,PK>

All Known Implementing Classes:

GenericHibernateDao, JpaEntityManagerDao

public interface GenericDao<T extends BaseEntity<PK>,PK extends Serializable>
extends Serializable

The interface GenericDao provide an API for database operations like insert, delete, update and selections.

Author:

Asterios Raptis

Method Summary

Modifier and Type	Method and Description
void	delete(List<T> entities) Delete all persistent entities in the given list.
void	delete(PK id) Deletes an entity of a given Id.
void	delete(T entity) Deletes the given entity from persistent storage in the database.
void	evict(T entity) Remove this instance from the session cache.
boolean	exists(PK id) Checks if an entry exists with the given id.
List<T>	findAll() Returns a list of all persistent entities.
T	get(PK id) Retrieve a persisted entity with a given id from the database.
Class<T>	getType() Gets the class type.
T	load(PK id) Retrieve a persisted entity with a given id from the database.
List<T>	merge(List<T> entities) Merges all new entities in the given list.
T	merge(T entity) Merges the given entity.
void	refresh(T entity) Re-read the state of the given instance from the underlying database.
List<PK>	save(List<T> entities) Save all new entities in the given list.
PK	save(T entity) Persist the given entity into database.
void	saveOrUpdate(List<T> entities) Save or update all transient entities in the given list.
void	saveOrUpdate(T entity) Save or update the given persistent entity.
void	update(List<T> entities) Update all transient entities in the given list.
void	update(T entity) Update changes made to the given entity.

Method Detail

delete

void delete(List<T> entities)

Delete all persistent entities in the given list.

Parameters:

entities - the list with the persistent entities to delete

delete

void delete(PK id)

Deletes an entity of a given Id. Will load the entity internally so consider using delete (T obj) directly

Parameters:

id - the id

delete

void delete(T entity)

Deletes the given entity from persistent storage in the database.

Parameters:

entity - the persistent entity

evict

void evict(T entity)

Remove this instance from the session cache.

Parameters:

entity - the entity to evict.

exists

boolean exists(PK id)

Checks if an entry exists with the given id.

Parameters:

id - the id to check

Returns:

true, if an entry exists with the given id, otherwise false.

findAll

List<T> findAll()

Returns a list of all persistent entities.

Returns:

list of all persistent entities

get

T get(PK id)

Retrieve a persisted entity with a given id from the database.

Parameters:

id - the id

Returns:

An entity of type T

getType

Class<T> getType()

Gets the class type.

Returns:

the class type

load

T load(PK id)

Retrieve a persisted entity with a given id from the database.

Parameters:

id - the id

Returns:

An entity of type T

merge

List<T> merge(List<T> entities)

Merges all new entities in the given list.

Parameters:

entities - the list to save

Returns:

the list with the ids of the merged entities

merge

T merge(T entity)

Merges the given entity. @see Hibernate documentation.

Parameters:

entity - the entity

Returns:

the entity

refresh

void refresh(T entity)

Re-read the state of the given instance from the underlying database.

Parameters:

entity - the entity to re-read.

save

List<PK> save(List<T> entities)

Save all new entities in the given list.

Parameters:

entities - the list to save

Returns:

the list with the ids of the saved entities

save

PK save(T entity)

Persist the given entity into database.

Parameters:

entity - the new instance to save.

Returns:

the id of the saved entity

saveOrUpdate

void saveOrUpdate(List<T> entities)

Save or update all transient entities in the given list.

Parameters:

entities - the transient entities

saveOrUpdate

void saveOrUpdate(T entity)

Save or update the given persistent entity.

Parameters:

entity - the transient entity to save or update.

update

void update(List<T> entities)

Update all transient entities in the given list.

Parameters:

entities - the transient entities to update.

update

void update(T entity)

Update changes made to the given entity.

Parameters:

entity - the transient entity to update.