Java tutorial
/* * Copyright (C) 2016 Marchegiano Danilo * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2.1 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ package d4n1x.photosocial.DAO.impl; import d4n1x.photosocial.DAO.PhotoDAO; import d4n1x.photosocial.domain.Category; import d4n1x.photosocial.domain.Photo; import java.util.ArrayList; import java.util.Calendar; import java.util.List; import org.hibernate.Criteria; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.Transaction; import org.hibernate.criterion.Restrictions; /** * * @author Marchegiano Danilo */ public class PhotoDAOImpl implements PhotoDAO { private SessionFactory factory; @Override public Photo getPhotoByID(long photo_id) throws Exception { Photo photo = null; Query query = null; String HQL = "FROM Photo WHERE photo_id = :photo_id"; Session session = factory.openSession(); try { query = session.createQuery(HQL); query.setParameter("photo_id", photo_id); photo = (Photo) query.uniqueResult(); } catch (RuntimeException e) { System.out.println("ERROR_DAO: Can't find photo by id"); System.out.println(e); } finally { session.close(); } return photo; } @Override public List<Photo> getPhotoByName(String photo_name) throws Exception { ArrayList<Photo> photos = null; Query query = null; String HQL = "FROM Photo WHERE photo_name = :photo_name"; Session session = factory.openSession(); try { query = session.createQuery(HQL); query.setParameter("photo_name", photo_name); photos = (ArrayList<Photo>) query.uniqueResult(); } catch (RuntimeException e) { System.out.println("ERROR_DAO: Can't find photo by name"); System.out.println(e); } finally { session.close(); } return photos; } @Override public void deletePhoto(long photo_id) throws Exception { Transaction tx = null; Photo photo = getPhotoByID(photo_id); Session session = factory.openSession(); try { tx = session.beginTransaction(); session.delete(photo); tx.commit(); } catch (RuntimeException e) { System.out.println("ERROR_DAO: Can't delete photo"); System.out.println(e); tx.rollback(); } finally { session.close(); } } @Override public void modifyPhoto(Photo photo) throws Exception { Transaction tx = null; Session session = factory.openSession(); try { tx = session.beginTransaction(); session.saveOrUpdate(photo); tx.commit(); } catch (RuntimeException e) { System.out.println("ERROR_DAO: Can't modify photo"); System.out.println(e); tx.rollback(); } finally { session.close(); } } public SessionFactory getFactory() { return factory; } public void setFactory(SessionFactory factory) { this.factory = factory; } @Override public int getLastPhotoId() throws Exception { int big_id = 0; Query query = null; String HQL = "SELECT MAX(photo_id) FROM Photo"; Session session = factory.openSession(); try { query = session.createQuery(HQL); big_id = new Integer(query.uniqueResult().toString()); } catch (ClassCastException cce) { System.out.println("WARNING_DAO: Can't find the calimum. Return 0"); System.out.println("WARNING_DAO: " + cce); return 0; } catch (RuntimeException e) { System.out.println("ERROR_DAO: Can't find the calimum"); System.out.println("ERROR_DAO: " + e); } finally { session.close(); } return big_id; } @Override public void addPhoto(Photo photo) throws Exception { Transaction tx = null; Session session = factory.openSession(); try { tx = session.beginTransaction(); session.save(photo); tx.commit(); } catch (RuntimeException e) { System.out.println("ERROR_DAO: Can't add photo"); System.out.println("ERROR_DAO: " + e); tx.rollback(); } finally { session.close(); } } @Override public List<Photo> getAllPhotos() throws Exception { Query query = null; List<Photo> all_photos = null; String HQL = "FROM Photo"; Session session = factory.openSession(); try { query = session.createQuery(HQL); all_photos = (List<Photo>) query.list(); } catch (RuntimeException e) { System.out.println("ERROR_DAO: Can't find all photos"); System.out.println("ERROR_DAO: " + e); } finally { session.close(); } return all_photos; } @Override public List<Photo> getNewPhotos() throws Exception { List<Photo> new_photos = null; Calendar cal = Calendar.getInstance(); cal.add(Calendar.HOUR_OF_DAY, -12); Session session = factory.openSession(); try { Criteria cr = session.createCriteria(Photo.class); cr.add(Restrictions.gt("upload_data", cal.getTime())); cr.setMaxResults(10); new_photos = (List<Photo>) cr.list(); } catch (RuntimeException e) { System.out.println("ERROR_DAO: " + e.getMessage()); } finally { session.close(); } return new_photos; } @Override public List<Photo> getPopularPhotos() throws Exception { Query query = null; List<Photo> new_photos = null; Calendar cal = Calendar.getInstance(); cal.add(Calendar.HOUR_OF_DAY, -24); String HQL = "FROM Photo p WHERE p.upload_data >= :cal ORDER BY p.photo_likes DESC"; Session session = factory.openSession(); try { query = session.createQuery(HQL); query.setCalendarDate("cal", cal); new_photos = (List<Photo>) query.list(); } catch (RuntimeException e) { } finally { session.close(); } return new_photos; } @Override public List<Photo> getPhotosFromCategory(Category cat) throws Exception { List<Photo> ph_from_category = null; Query query = null; String HQL = "FROM Photo WHERE category_category_id = :category_id ORDER BY upload_data DESC"; Session session = factory.openSession(); try { query = session.createQuery(HQL); query.setParameter("category_id", cat.getCategory_id()); ph_from_category = (List<Photo>) query.list(); } catch (RuntimeException e) { System.out.println("ERROR_DAO: Can't find photo form " + cat.getCategory_name()); System.out.println("ERROR_DAO: " + e.getMessage()); } finally { session.close(); } return ph_from_category; } }