org.apache.ambari.server.orm.dao

Class CrudDAO<E,K>

java.lang.Object

org.apache.ambari.server.orm.dao.CrudDAO<E,K>

Type Parameters:

E - entity class

K - primary key class

Direct Known Subclasses:

AmbariConfigurationDAO, HostVersionDAO, RepositoryVersionDAO

public class CrudDAO<E,K>
extends Object

CRUD DAO.

Constructor Summary

Constructors

Constructor and Description
CrudDAO(Class<E> entityClass) Constructor.

Method Summary

Modifier and Type	Method and Description
protected void	create(E entity) Creates entity.
List<E>	findAll() Retrieves all entities.
E	findByPK(K pk) Retrieves entity by primary key.
Long	findMaxId(String idColName) Retrieves the maximum ID from the entities.
E	merge(E entity) Updates entity.
void	refresh(E entity) Refreshes entity.
void	remove(Collection<E> entities) Deletes entities.
void	remove(E entity) Deletes entity.
void	removeByPK(K pk) Deletes entity by PK.

Methods inherited from class java.lang.Object

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

Constructor Detail

CrudDAO

public CrudDAO(Class<E> entityClass)

Constructor.

Parameters:

entityClass - entity class

Method Detail

findByPK

public E findByPK(K pk)

Retrieves entity by primary key.

Parameters:

pk - primary key

Returns:

null if there is no suitable entity

findAll

public List<E> findAll()

Retrieves all entities.

Returns:

list of all entities

findMaxId

public Long findMaxId(String idColName)

Retrieves the maximum ID from the entities.

Parameters:

idColName - name of the column that corresponds to the ID.

Returns:

maximum ID, or 0 if none exist.

create

protected void create(E entity)

Creates entity.

Parameters:

entity - entity to create

merge

public E merge(E entity)

Updates entity.

Parameters:

entity - entity to update

Returns:

updated entity

refresh

public void refresh(E entity)

Refreshes entity.

Parameters:

entity - entity to refresh

remove

public void remove(E entity)

Deletes entity.

Parameters:

entity - entity to delete

remove

public void remove(Collection<E> entities)

Deletes entities.

Parameters:

entities - entities to delete

removeByPK

public void removeByPK(K pk)

Deletes entity by PK.

Parameters:

pk - primary key