io.dropwizard.hibernate

Class AbstractDAO<E>

java.lang.Object

io.dropwizard.hibernate.AbstractDAO<E>

Type Parameters:

E - the class which this DAO manages

public class AbstractDAO<E>
extends Object

An abstract base class for Hibernate DAO classes.

Constructor Summary

Constructors

Constructor and Description
AbstractDAO(org.hibernate.SessionFactory sessionFactory) Creates a new DAO with a given session provider.

Method Summary

Methods

Modifier and Type	Method and Description
protected org.hibernate.Criteria	criteria() Creates a new Criteria query for <E>.
protected org.hibernate.Session	currentSession() Returns the current Session.
protected E	get(Serializable id) Return the persistent instance of <E> with the given identifier, or null if there is no such persistent instance.
Class<E>	getEntityClass() Returns the entity class managed by this DAO.
protected <T> T	initialize(T proxy) Force initialization of a proxy or persistent collection.
protected List<E>	list(org.hibernate.Criteria criteria) Get the results of a Criteria query.
protected List<E>	list(org.hibernate.Query query) Get the results of a query.
protected org.hibernate.Query	namedQuery(String queryName) Returns a named Query.
protected E	persist(E entity) Either save or update the given instance, depending upon resolution of the unsaved-value checks (see the manual for discussion of unsaved-value checking).
protected E	uniqueResult(org.hibernate.Criteria criteria) Convenience method to return a single instance that matches the criteria, or null if the criteria returns no results.
protected E	uniqueResult(org.hibernate.Query query) Convenience method to return a single instance that matches the query, or null if the query returns no results.

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractDAO

public AbstractDAO(org.hibernate.SessionFactory sessionFactory)

Creates a new DAO with a given session provider.

Parameters:

sessionFactory - a session provider

Method Detail

currentSession

protected org.hibernate.Session currentSession()

Returns the current Session.

Returns:

the current session

criteria

protected org.hibernate.Criteria criteria()

Creates a new Criteria query for <E>.

Returns:

a new Criteria query

See Also:

SharedSessionContract.createCriteria(Class)

namedQuery

protected org.hibernate.Query namedQuery(String queryName)
                                  throws org.hibernate.HibernateException

Returns a named Query.

Parameters:

queryName - the name of the query

Returns:

the named query

Throws:

org.hibernate.HibernateException

See Also:

SharedSessionContract.getNamedQuery(String)

getEntityClass

public Class<E> getEntityClass()

Returns the entity class managed by this DAO.

Returns:

the entity class managed by this DAO

uniqueResult

protected E uniqueResult(org.hibernate.Criteria criteria)
                  throws org.hibernate.HibernateException

Convenience method to return a single instance that matches the criteria, or null if the criteria returns no results.

Parameters:

criteria - the Criteria query to run

Returns:

the single result or null

Throws:

org.hibernate.HibernateException - if there is more than one matching result

See Also:

Criteria.uniqueResult()

uniqueResult

protected E uniqueResult(org.hibernate.Query query)
                  throws org.hibernate.HibernateException

Convenience method to return a single instance that matches the query, or null if the query returns no results.

Parameters:

query - the query to run

Returns:

the single result or null

Throws:

org.hibernate.HibernateException - if there is more than one matching result

See Also:

Query.uniqueResult()

list

protected List<E> list(org.hibernate.Criteria criteria)
                throws org.hibernate.HibernateException

Get the results of a Criteria query.

Parameters:

criteria - the Criteria query to run

Returns:

the list of matched query results

Throws:

org.hibernate.HibernateException

See Also:

Criteria.list()

list

protected List<E> list(org.hibernate.Query query)
                throws org.hibernate.HibernateException

Get the results of a query.

Parameters:

query - the query to run

Returns:

the list of matched query results

Throws:

org.hibernate.HibernateException

See Also:

Query.list()

get

protected E get(Serializable id)

Return the persistent instance of <E> with the given identifier, or null if there is no such persistent instance. (If the instance, or a proxy for the instance, is already associated with the session, return that instance or proxy.)

Parameters:

id - an identifier

Returns:

a persistent instance or null

Throws:

org.hibernate.HibernateException

See Also:

Session.get(Class, Serializable)

persist

protected E persist(E entity)
             throws org.hibernate.HibernateException

Either save or update the given instance, depending upon resolution of the unsaved-value checks (see the manual for discussion of unsaved-value checking).

This operation cascades to associated instances if the association is mapped with cascade="save-update".

Parameters:

entity - a transient or detached instance containing new or updated state

Throws:

org.hibernate.HibernateException

See Also:

Session.saveOrUpdate(Object)

initialize

protected <T> T initialize(T proxy)
                throws org.hibernate.HibernateException

Force initialization of a proxy or persistent collection.

Note: This only ensures initialization of a proxy object or collection; it is not guaranteed that the elements INSIDE the collection will be initialized/materialized.

Parameters:

proxy - a persistable object, proxy, persistent collection or null

Throws:

org.hibernate.HibernateException - if we can't initialize the proxy at this time, eg. the Session was closed