com.mycompany.gmailtest.dao.MessageDao.java Source code

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Here is the source code for com.mycompany.gmailtest.dao.MessageDao.java

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package com.mycompany.gmailtest.dao;

import com.mycompany.gmailtest.dto.Message;
import com.mycompany.gmailtest.util.HibernateUtil;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

/**
 *
 * @author Anatolii
 */
public class MessageDao {

    public void addMessages(List<Message> messages) {
        try {
            Session session = HibernateUtil.getSessionFactory().openSession();
            Transaction tx = session.beginTransaction();
            for (int i = 0; i < messages.size(); i++) {
                Message message = messages.get(i);
                session.save(message);
                if (i % 100 == 0) {
                    session.flush();
                    session.clear();
                }
            }
            tx.commit();
            session.close();
        } catch (Exception e) {
            throw e;
        }
    }

    public List<Message> getMessages() {
        List<Message> messages = new ArrayList<>();
        try {
            Session session = HibernateUtil.getSessionFactory().openSession();
            Transaction tx = session.beginTransaction();
            messages = session.createCriteria(Message.class).list();
            tx.commit();
            session.close();
        } catch (Exception e) {
            throw e;
        }
        return messages;
    }

    public void deleteMessages() {
        try {
            Session session = HibernateUtil.getSessionFactory().openSession();
            Transaction tx = session.beginTransaction();
            session.createQuery("delete from Message").executeUpdate();
            tx.commit();
            session.close();
        } catch (Exception e) {
            throw e;
        }
    }

    public void deleteMessage(String id) {
        try {
            Session session = HibernateUtil.getSessionFactory().openSession();
            Transaction tx = session.beginTransaction();
            Query query = session.createQuery("delete Message where message_id = :messageId");
            query.setParameter("messageId", id);
            query.executeUpdate();
            tx.commit();
            session.close();
        } catch (Exception e) {
            throw e;
        }
    }
}