org.dellroad.stuff.dao
Class AbstractDAO.DAOQueryUniqueCallback

java.lang.Object
  org.dellroad.stuff.dao.QueryCallback<R>
      org.dellroad.stuff.dao.TypedQueryCallback<T,T>
          org.dellroad.stuff.dao.AbstractDAO.DAOQueryUniqueCallback

All Implemented Interfaces:

JpaCallback<T>

Enclosing class:

AbstractDAO<T>

protected abstract class AbstractDAO.DAOQueryUniqueCallback
extends TypedQueryCallback<T,T>

Convenience subclass of QueryCallback for use by DAO subclasses when returning a single persistent instance.

Returns null if instance is not found.

Constructor Summary

protected

AbstractDAO.DAOQueryUniqueCallback()

Method Summary

protected T

executeQuery(TypedQuery<T> query) Execute the query.

Methods inherited from class org.dellroad.stuff.dao.TypedQueryCallback

buildQuery, executeQuery

Methods inherited from class org.dellroad.stuff.dao.QueryCallback

doInJpa

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractDAO.DAOQueryUniqueCallback

protected AbstractDAO.DAOQueryUniqueCallback()

Method Detail

executeQuery

protected final T executeQuery(TypedQuery<T> query)

Description copied from class: TypedQueryCallback

Execute the query.

Specified by:

executeQuery in class TypedQueryCallback<T,T>