ru.sstu.dao

Class AbstractDao<T extends Serializable>

java.lang.Object

ru.sstu.dao.AbstractDao<T>

Type Parameters:

T - concrete entity class

All Implemented Interfaces:

Dao<T>, ReadOnlyDao<T>

public abstract class AbstractDao<T extends Serializable>
extends Object
implements Dao<T>

AbstractDao class contains generic methods for data access.

Since:

DAO 1.0

Author:

Denis_Murashev

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractDao() Initializes DAO properties.

Method Summary

Methods

Modifier and Type	Method and Description
protected Number	aggregate(org.hibernate.criterion.DetachedCriteria criteria) Provides result of aggregate function in query.
protected void	delete(org.hibernate.criterion.DetachedCriteria criteria) Deletes entities by criteria.
void	delete(List<T> entities) delete method removes existing entities.
protected void	delete(Object entity) Deletes entity which is not of type T.
void	delete(T entity) Removes entity.
List<T>	find() Returns all entities from data source.
T	findById(Serializable id) Returns entity with given id.
protected org.hibernate.criterion.DetachedCriteria	getCriteria() Provides search criteria which can be used for searches with criteria.
protected abstract org.springframework.orm.hibernate3.HibernateTemplate	getTemplate() Provides actual HibernateTemplate object.
protected List<T>	hql(String query) Executes HQL query.
protected List<T>	hql(String query, Object... values) Executes HQL query.
protected List<T>	hql(String query, Object value) Executes HQL query.
protected <U> List<U>	list(org.hibernate.criterion.DetachedCriteria criteria) Provides list of entities.
void	save(List<T> entities) save method saves list of entities.
protected void	save(Object entity) Saves entity which is not of type T.
void	save(T entity) Saves entity.
protected <U> U	unique(org.hibernate.criterion.DetachedCriteria criteria) Provides unique entity with given criteria.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractDao

protected AbstractDao()

Initializes DAO properties.

Method Detail

find

public List<T> find()

Returns all entities from data source.

Specified by:

find in interface ReadOnlyDao<T extends Serializable>

Returns:

all entities from data source.

findById

public T findById(Serializable id)

Returns entity with given id.

Specified by:

findById in interface ReadOnlyDao<T extends Serializable>

Parameters:

id - entity's id

Returns:

entity

save

public void save(T entity)

Saves entity.

Specified by:

save in interface Dao<T extends Serializable>

Parameters:

entity - entity

save

public void save(List<T> entities)

save method saves list of entities.

Specified by:

save in interface Dao<T extends Serializable>

Parameters:

entities - entities for saving

delete

public void delete(T entity)

Removes entity.

Specified by:

delete in interface Dao<T extends Serializable>

Parameters:

entity - entity

delete

public void delete(List<T> entities)

delete method removes existing entities.

Specified by:

delete in interface Dao<T extends Serializable>

Parameters:

entities - entities to be deleted

getCriteria

protected org.hibernate.criterion.DetachedCriteria getCriteria()

Provides search criteria which can be used for searches with criteria.

Returns:

detached criteria

unique

protected <U> U unique(org.hibernate.criterion.DetachedCriteria criteria)

Provides unique entity with given criteria.

Type Parameters:

U - concrete entity class

Parameters:

criteria - criteria

Returns:

unique entity

list

protected <U> List<U> list(org.hibernate.criterion.DetachedCriteria criteria)

Provides list of entities.

Type Parameters:

U - concrete entity class

Parameters:

criteria - search criteria

Returns:

list of entities

aggregate

protected Number aggregate(org.hibernate.criterion.DetachedCriteria criteria)

Provides result of aggregate function in query.

Parameters:

criteria - criteria

Returns:

numeric result

hql

protected List<T> hql(String query)

Executes HQL query.

Parameters:

query - query

Returns:

list of found entities

hql

protected List<T> hql(String query,
          Object value)

Executes HQL query.

Parameters:

query - query

value - value

Returns:

list of found entities

hql

protected List<T> hql(String query,
          Object... values)

Executes HQL query.

Parameters:

query - query

values - values

Returns:

list of found entities

save

protected void save(Object entity)

Saves entity which is not of type T.

Parameters:

entity - entity to be saved

delete

protected void delete(Object entity)

Deletes entity which is not of type T.

Parameters:

entity - entity to be deleted

delete

protected void delete(org.hibernate.criterion.DetachedCriteria criteria)

Deletes entities by criteria.

Parameters:

criteria - criteria for entities to be deleted

getTemplate

protected abstract org.springframework.orm.hibernate3.HibernateTemplate getTemplate()

Provides actual HibernateTemplate object.

Returns:

HibernateTemplate object