com.humber.java.dao.ImageDAO.java Source code

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Here is the source code for com.humber.java.dao.ImageDAO.java

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/**
 *
 * @author DS
 */
/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.humber.java.dao;

/**
 *
 * @author DS
 */
import java.util.ArrayList;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.humber.java.model.Picture;
import com.humber.java.HibernateUtil;

public class ImageDAO {
    public void addImage(Picture image) {
        Transaction trns = null;

        Session session = HibernateUtil.getSessionFactory().openSession();
        try {
            trns = session.beginTransaction();
            session.save(image);
            session.getTransaction().commit();
        } catch (RuntimeException e) {
            if (trns != null) {
                trns.rollback();
            }
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
    }

    public void deleteImage(int imageId) {
        Transaction trns = null;
        Session session = HibernateUtil.getSessionFactory().openSession();
        try {
            trns = session.beginTransaction();
            Picture image = (Picture) session.load(Picture.class, new Integer(imageId));
            session.delete(image);
            session.getTransaction().commit();
        } catch (RuntimeException e) {
            if (trns != null) {
                trns.rollback();
            }
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
    }

    public void updateImage(Picture image) {
        Transaction trns = null;
        Session session = HibernateUtil.getSessionFactory().openSession();
        try {
            trns = session.beginTransaction();
            session.update(image);
            session.getTransaction().commit();
        } catch (RuntimeException e) {
            if (trns != null) {
                trns.rollback();
            }
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
    }

    public List<Picture> getAllImages() {
        List<Picture> images = new ArrayList<Picture>();
        Transaction trns = null;
        Session session = HibernateUtil.getSessionFactory().openSession();
        try {
            trns = session.beginTransaction();
            images = session.createQuery("from Image").list();
        } catch (RuntimeException e) {
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
        return images;
    }

    public Picture getImageById(int imageId) {
        Picture image = null;
        Transaction trns = null;
        Session session = HibernateUtil.getSessionFactory().openSession();
        try {
            trns = session.beginTransaction();
            String queryString = "from Image where id = :id";
            Query query = session.createQuery(queryString);
            query.setInteger("id", imageId);
            image = (Picture) query.uniqueResult();
        } catch (RuntimeException e) {
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
        return image;
    }
}