br.edu.DAO.GenericoDAO.java Source code

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Here is the source code for br.edu.DAO.GenericoDAO.java

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package br.edu.DAO;

import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.criterion.Restrictions;

/**
 *
 * @author Lab1
 */
public class GenericoDAO<T> implements DAO<T> {

    protected Session sessao;
    public Class classe;

    public GenericoDAO(Class classe) {
        this.classe = classe;
    }

    public SessionFactory getSessao() {
        return new Configuration().configure().buildSessionFactory();
    }

    public boolean salvar(T t) {
        sessao = null;
        try {
            sessao = getSessao().openSession();
            sessao.beginTransaction();
            sessao.save(t);
            sessao.getTransaction().commit();
        } catch (Exception e) {
            System.out.println("Erro no cadastro: " + e);
            return false;
        } finally {
            sessao.close();
        }
        return true;
    }

    public boolean editar(T t) {
        sessao = null;
        try {
            sessao = getSessao().openSession();
            sessao.beginTransaction();
            sessao.update(t);
            sessao.getTransaction().commit();
        } catch (Exception e) {
            System.out.println("Erro na edicao: " + e);
            return false;
        } finally {
            sessao.close();
        }
        return true;
    }

    public boolean deletar(T t) {
        sessao = null;
        try {
            sessao = getSessao().openSession();
            sessao.beginTransaction();
            sessao.delete(t);
            sessao.getTransaction().commit();
        } catch (Exception e) {
            System.out.println("Erro na exclusao: " + e);
            return false;
        } finally {
            sessao.close();
        }
        return true;
    }

    public List<T> listar() {
        List<T> lista = null;
        sessao = null;
        try {

            sessao = getSessao().openSession();
            lista = sessao.createCriteria(classe).list();
        } catch (Exception e) {
            System.out.println("Erro na lista: " + e);
        } finally {
            sessao.close();
        }
        return lista;
    }

    public List<T> listarCampos(String campo, Object valor) {
        sessao = null;
        List<T> lista = null;
        try {
            sessao = getSessao().openSession();
            lista = sessao.createCriteria(classe).add(Restrictions.eq(campo, valor)).list();
        } catch (Exception e) {
            System.out.println("Erro na lista de campo: " + e);
        } finally {
            sessao.close();
        }
        return lista;
    }
}