重写的HibernateDaoSupport

/**
* 重写Spring的HibernateDaoSupport,使用注解完成SessionFactory的注入。
*/
package org.cric.dao.impl;

import javax.annotation.Resource;

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.orm.hibernate3.HibernateTemplate;
import org.springframework.orm.hibernate3.SessionFactoryUtils;

public class MyHibernateDaoSupport {
@Resource private SessionFactory sessionFactory;
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!
* <p>
* 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.
*/
public final 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.
* <p>
* <b>Note: The returned HibernateTemplate is a shared instance.</b> 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
* <code>new HibernateTemplate(getSessionFactory())</code>, in which case
* you're allowed to customize the settings on the resulting instance.
*/
public final HibernateTemplate getHibernateTemplate() {
this.setSessionFactory(sessionFactory);
return this.hibernateTemplate;
}

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".
* <p>
* <b>Note that this is not meant to be invoked from HibernateTemplate code
* but rather just in plain Hibernate code.</b> Either rely on a
* thread-bound Session or use it in combination with
* {@link #releaseSession}.
* <p>
* 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)
*/
protected final Session getSession()
throws DataAccessResourceFailureException, IllegalStateException {
this.setSessionFactory(sessionFactory);
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.
* <p>
* <b>Note that this is not meant to be invoked from HibernateTemplate code
* but rather just in plain Hibernate code.</b> Either rely on a
* thread-bound Session or use it in combination with
* {@link #releaseSession}.
* <p>
* 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)
*/
protected final 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
* <code>org.springframework.dao</code> hierarchy. Will automatically
* detect wrapped SQLExceptions and convert them accordingly.
* <p>
* Delegates to the
* {@link org.springframework.orm.hibernate3.HibernateTemplate#convertHibernateAccessException}
* method of this DAO's HibernateTemplate.
* <p>
* Typically used in plain Hibernate code, in combination with
* {@link #getSession} and {@link #releaseSession}.
*
* @param ex
*            HibernateException that occured
* @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).
* <p>
* 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());
}

}