com.hm.modelo.DAOUsu.java Source code

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Here is the source code for com.hm.modelo.DAOUsu.java

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package com.hm.modelo;

import java.util.ArrayList;
import java.util.Collections;
import static java.util.Collections.singletonMap;
import java.util.Map;
import org.codehaus.jackson.map.ObjectMapper;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Restrictions;

public class DAOUsu {

    public String obtenerTodos() throws Exception {

        SessionFactory factory = HIbernate.getSessionFactory();
        Session sesion = factory.openSession();
        Transaction tranza = sesion.beginTransaction();

        Criteria cri = sesion.createCriteria(Usu.class);

        ArrayList<Usu> usuarios = (ArrayList<Usu>) cri.list();
        Map<String, ArrayList<Usu>> singletonMap = Collections.singletonMap("usuario", usuarios);

        ObjectMapper mapper = new ObjectMapper();

        tranza.commit();
        sesion.close();

        return mapper.writeValueAsString(singletonMap);
    }

    public String obtenerUsuarioPorId(Integer id) throws Exception {
        SessionFactory factory = HIbernate.getSessionFactory();
        Session sesion = factory.openSession();
        Transaction tranza = sesion.beginTransaction();

        Criteria cri = sesion.createCriteria(Usu.class).add(Restrictions.idEq(id));

        Usu u = (Usu) cri.uniqueResult();

        ObjectMapper mapper = new ObjectMapper();

        return mapper.writeValueAsString(u);
    }

    public String obtenerPorId(Integer id) throws Exception {
        SessionFactory factory = HIbernate.getSessionFactory();
        Session sesion = factory.openSession();
        Transaction tranza = sesion.beginTransaction();

        Criteria cri = sesion.createCriteria(Usu.class).add(Restrictions.idEq(id));
        Usu usuario = (Usu) cri.uniqueResult();

        ObjectMapper mapper = new ObjectMapper();

        tranza.commit();
        sesion.close();

        return mapper.writeValueAsString(usuario);
    }

    public String obtenerPorNOmbre(String nombre) throws Exception {
        SessionFactory factory = HIbernate.getSessionFactory();
        Session sesion = factory.openSession();
        Transaction tranza = sesion.beginTransaction();

        Criteria cri = sesion.createCriteria(Usu.class).add(Restrictions.like("nombre", nombre + "%"));
        Criteria cri2 = sesion.createCriteria(Usu.class).add(Restrictions.eq("nombre", nombre));
        Criteria cri3 = sesion.createCriteria(Usu.class).add(Restrictions.between("edad", 18, 40))
                .addOrder(Order.asc("nombre"));
        Criteria cri4 = sesion.createCriteria(Usu.class).add(Restrictions.lt("sueldo", new Integer(4000)));
        Criteria cri5 = sesion.createCriteria(Usu.class).add(Restrictions.gt("sueldo", new Integer(4000)));

        ArrayList<Usu> usuarios = (ArrayList<Usu>) cri.list();

        ObjectMapper mapper = new ObjectMapper();

        Map<String, ArrayList<Usu>> singletonMap = Collections.singletonMap("usuarios", usuarios);

        tranza.commit();
        sesion.close();

        return mapper.writeValueAsString(singletonMap);
    }

}