angeldx.manager.EstudianteManager.java Source code

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Here is the source code for angeldx.manager.EstudianteManager.java

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/*
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 */

package angeldx.manager;

import angeldx.to.Estudiante;
import angeldx.util.HibernateUtil;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

/**
 *
 * @author AngelDX
 */

public class EstudianteManager {

    public List<Estudiante> listar() {
        List<Estudiante> list = new ArrayList<Estudiante>();
        Session session = HibernateUtil.openSession();
        Transaction tran = null;
        try {
            tran = session.getTransaction();
            tran.begin();
            list = session.createQuery("from Estudiante").list(); //from Estudiante de llama de la persitencia de datos (to)               
            tran.commit();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
        return list;
    }

    public boolean registrar(Estudiante est) {
        Session session = HibernateUtil.openSession();
        Transaction tran = null;
        try {
            tran = session.getTransaction();
            tran.begin();
            session.saveOrUpdate(est);
            tran.commit();
        } catch (Exception e) {
            if (tran != null) {
                tran.rollback();
            }
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
        return true;
    }

    public Estudiante buscarPorId(int id) {
        Estudiante est = null;
        Transaction tran = null;
        Session session = HibernateUtil.openSession();
        try {
            tran = session.beginTransaction();
            String queryString = "from Estudiante where id = :id";
            Query query = session.createQuery(queryString);
            query.setInteger("id", id);
            est = (Estudiante) query.uniqueResult();
        } catch (RuntimeException e) {
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
        return est;
    }

    public boolean eliminar(int id) {
        Session session = HibernateUtil.openSession();
        Transaction tx = null;
        try {
            tx = session.beginTransaction();
            Estudiante est = (Estudiante) session.load(Estudiante.class, new Integer(id));
            session.delete(est);
            tx.commit();
        } catch (RuntimeException e) {
            if (tx != null) {
                tx.rollback();
            }
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
        return true;
    }
}