com.giants.dal.dao.hibernate.HibernateDaoSupport Maven / Gradle / Ivy
package com.giants.dal.dao.hibernate;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.dao.support.DaoSupport;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.orm.hibernate3.SessionFactoryUtils;
/**
* @author vencent.lu
*
*/
public class HibernateDaoSupport extends DaoSupport {
private HibernateTemplate hibernateTemplate;
/**
* Set the Hibernate SessionFactory to be used by this DAO.
* Will automatically create a HibernateTemplate for the given SessionFactory.
* @see #createHibernateTemplate
* @see #setHibernateTemplate
*/
public final void setSessionFactory(SessionFactory sessionFactory) {
if (this.hibernateTemplate == null || sessionFactory != this.hibernateTemplate.getSessionFactory()) {
this.hibernateTemplate = createHibernateTemplate(sessionFactory);
}
}
/**
* Create a HibernateTemplate for the given SessionFactory.
* Only invoked if populating the DAO with a SessionFactory reference!
* Can be overridden in subclasses to provide a HibernateTemplate instance
* with different configuration, or a custom HibernateTemplate subclass.
* @param sessionFactory the Hibernate SessionFactory to create a HibernateTemplate for
* @return the new HibernateTemplate instance
* @see #setSessionFactory
*/
protected HibernateTemplate createHibernateTemplate(SessionFactory sessionFactory) {
return new HibernateTemplate(sessionFactory);
}
/**
* Return the Hibernate SessionFactory used by this DAO.
*/
SessionFactory getSessionFactory() {
return (this.hibernateTemplate != null ? this.hibernateTemplate.getSessionFactory() : null);
}
/**
* Set the HibernateTemplate for this DAO explicitly,
* as an alternative to specifying a SessionFactory.
* @see #setSessionFactory
*/
public final void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
this.hibernateTemplate = hibernateTemplate;
}
/**
* Return the HibernateTemplate for this DAO,
* pre-initialized with the SessionFactory or set explicitly.
*
Note: The returned HibernateTemplate is a shared instance.
* You may introspect its configuration, but not modify the configuration
* (other than from within an {@link #initDao} implementation).
* Consider creating a custom HibernateTemplate instance via
* new HibernateTemplate(getSessionFactory()), in which
* case you're allowed to customize the settings on the resulting instance.
*/
HibernateTemplate getHibernateTemplate() {
return this.hibernateTemplate;
}
@Override
protected final void checkDaoConfig() {
if (this.hibernateTemplate == null) {
throw new IllegalArgumentException("'sessionFactory' or 'hibernateTemplate' is required");
}
}
/**
* Obtain a Hibernate Session, either from the current transaction or
* a new one. The latter is only allowed if the
* {@link org.springframework.orm.hibernate3.HibernateTemplate#setAllowCreate "allowCreate"}
* setting of this bean's {@link #setHibernateTemplate HibernateTemplate} is "true".
*
Note that this is not meant to be invoked from HibernateTemplate code
* but rather just in plain Hibernate code. Either rely on a thread-bound
* Session or use it in combination with {@link #releaseSession}.
*
In general, it is recommended to use HibernateTemplate, either with
* the provided convenience operations or with a custom HibernateCallback
* that provides you with a Session to work on. HibernateTemplate will care
* for all resource management and for proper exception conversion.
* @return the Hibernate Session
* @throws DataAccessResourceFailureException if the Session couldn't be created
* @throws IllegalStateException if no thread-bound Session found and allowCreate=false
* @see org.springframework.orm.hibernate3.SessionFactoryUtils#getSession(SessionFactory, boolean)
*/
Session getSession()
throws DataAccessResourceFailureException, IllegalStateException {
return getSession(this.hibernateTemplate.isAllowCreate());
}
/**
* Obtain a Hibernate Session, either from the current transaction or
* a new one. The latter is only allowed if "allowCreate" is true.
*
Note that this is not meant to be invoked from HibernateTemplate code
* but rather just in plain Hibernate code. Either rely on a thread-bound
* Session or use it in combination with {@link #releaseSession}.
*
In general, it is recommended to use
* {@link #getHibernateTemplate() HibernateTemplate}, either with
* the provided convenience operations or with a custom
* {@link org.springframework.orm.hibernate3.HibernateCallback} that
* provides you with a Session to work on. HibernateTemplate will care
* for all resource management and for proper exception conversion.
* @param allowCreate if a non-transactional Session should be created when no
* transactional Session can be found for the current thread
* @return the Hibernate Session
* @throws DataAccessResourceFailureException if the Session couldn't be created
* @throws IllegalStateException if no thread-bound Session found and allowCreate=false
* @see org.springframework.orm.hibernate3.SessionFactoryUtils#getSession(SessionFactory, boolean)
*/
Session getSession(boolean allowCreate)
throws DataAccessResourceFailureException, IllegalStateException {
return (!allowCreate ?
SessionFactoryUtils.getSession(getSessionFactory(), false) :
SessionFactoryUtils.getSession(
getSessionFactory(),
this.hibernateTemplate.getEntityInterceptor(),
this.hibernateTemplate.getJdbcExceptionTranslator()));
}
/**
* Convert the given HibernateException to an appropriate exception from the
* org.springframework.dao hierarchy. Will automatically detect
* wrapped SQLExceptions and convert them accordingly.
*
Delegates to the
* {@link org.springframework.orm.hibernate3.HibernateTemplate#convertHibernateAccessException}
* method of this DAO's HibernateTemplate.
*
Typically used in plain Hibernate code, in combination with
* {@link #getSession} and {@link #releaseSession}.
* @param ex HibernateException that occurred
* @return the corresponding DataAccessException instance
* @see org.springframework.orm.hibernate3.SessionFactoryUtils#convertHibernateAccessException
*/
protected final DataAccessException convertHibernateAccessException(HibernateException ex) {
return this.hibernateTemplate.convertHibernateAccessException(ex);
}
/**
* Close the given Hibernate Session, created via this DAO's SessionFactory,
* if it isn't bound to the thread (i.e. isn't a transactional Session).
*
Typically used in plain Hibernate code, in combination with
* {@link #getSession} and {@link #convertHibernateAccessException}.
* @param session the Session to close
* @see org.springframework.orm.hibernate3.SessionFactoryUtils#releaseSession
*/
protected final void releaseSession(Session session) {
SessionFactoryUtils.releaseSession(session, getSessionFactory());
}
}