Java tutorial
/******************************************************************************* * Copyright 2016 * Ubiquitous Knowledge Processing (UKP) Lab * Technische Universitt Darmstadt * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *******************************************************************************/ package de.tudarmstadt.ukp.wikipedia.api.hibernate; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.hibernate.LockOptions; import org.hibernate.SessionFactory; import de.tudarmstadt.ukp.wikipedia.api.Wikipedia; /** * Home object for class Page * @see de.tudarmstadt.ukp.wikipedia.api.Page * @author Hibernate Tools */ public class PageDAO { private final Log logger = LogFactory.getLog(getClass()); private static final String PAGE_CLASS = "de.tudarmstadt.ukp.wikipedia.api.hibernate.Page"; private final SessionFactory sessionFactory; private Wikipedia wiki; public PageDAO(Wikipedia pWiki) { this.wiki = pWiki; sessionFactory = getSessionFactory(); } protected SessionFactory getSessionFactory() { try { return WikiHibernateUtil.getSessionFactory(wiki.getDatabaseConfiguration()); } catch (Exception e) { logger.error("Could not locate SessionFactory in JNDI", e); throw new IllegalStateException("Could not locate SessionFactory in JNDI"); } } public void persist(Page transientInstance) { logger.debug("persisting Page instance"); try { sessionFactory.getCurrentSession().persist(transientInstance); logger.debug("persist successful"); } catch (RuntimeException re) { logger.error("persist failed", re); throw re; } } public void attachDirty(Page instance) { logger.debug("attaching dirty Page instance"); try { sessionFactory.getCurrentSession().saveOrUpdate(instance); logger.debug("attach successful"); } catch (RuntimeException re) { logger.error("attach failed", re); throw re; } } public void attachClean(Page instance) { logger.debug("attaching clean Page instance"); try { // sessionFactory.getCurrentSession().lock(instance, LockMode.NONE); sessionFactory.getCurrentSession().buildLockRequest(LockOptions.NONE).lock(instance); logger.debug("attach successful"); } catch (RuntimeException re) { logger.error("attach failed", re); throw re; } } public void delete(Page persistentInstance) { logger.debug("deleting Page instance"); try { sessionFactory.getCurrentSession().delete(persistentInstance); logger.debug("delete successful"); } catch (RuntimeException re) { logger.error("delete failed", re); throw re; } } public Page merge(Page detachedInstance) { logger.debug("merging Page instance"); try { Page result = (Page) sessionFactory.getCurrentSession().merge(detachedInstance); logger.debug("merge successful"); return result; } catch (RuntimeException re) { logger.error("merge failed", re); throw re; } } public Page findById(java.lang.Long id) { logger.debug("getting Page instance with id: " + id); try { Page instance = (Page) sessionFactory.getCurrentSession().get(PAGE_CLASS, id); if (instance == null) { logger.debug("get successful, no instance found"); } else { logger.debug("get successful, instance found"); } return instance; } catch (RuntimeException re) { logger.error("get failed", re); throw re; } } }