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Forum locked This topic is locked, you cannot edit posts or make further replies.  [ 4 posts ] 
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 Post subject: Obtaining a session
PostPosted: Fri Dec 24, 2004 12:44 pm 
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Joined: Sat May 29, 2004 2:16 pm
Posts: 81
in p 33 and p 35 code starts with Session s = getSessionFactory().openSession();
further on i read about creating SessionFactory and later (p129)
i read Session s = sessions.openSession();
i also read (cant remember where) creating a session is inexpensive.
This said, i've a method that starts with:

Code:
    public void guardaConvencao() throws HibernateException, ParseException {

        sessao = Sessao.currentSession();
        Transaction t = sessao.beginTransaction();

        String nomeConvencao = rg.jTextFieldCv.getText();
//...

        Convencao cv = new Convencao();

        cv.setNomeConvencao(nomeConvencao);
//...

        sessao.save(cv);
        t.commit();
        /**
         * se fecho a sessão, quando clico em inserir novamente dá erro ao dizer
         * q a sessão está fechada
         *
         * resolução: na classe sessão fiz:
         * if (s == null || !s.isOpen()) {
         */
        sessao.close();
    }

this method is called when one clicks submit in a gui button.
So far so good, but if user submits again, i get an error stating session is closed!
In order to turn this around i changed HibernateUtil method like this:
Code:
if (s == null || !s.isOpen()) {
and now works fine

i've the sensation this isnt abslolutely correct, but i wonder where in book i can solve this in another way
thanks in advance


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 Post subject:
PostPosted: Fri Dec 24, 2004 12:46 pm 
Hibernate Team
Hibernate Team

Joined: Mon Aug 25, 2003 9:11 pm
Posts: 4592
Location: Switzerland
I've no idea what you are asking for.


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 Post subject:
PostPosted: Fri Dec 24, 2004 12:51 pm 
Regular
Regular

Joined: Sat May 29, 2004 2:16 pm
Posts: 81
i changed this class
Code:
/*
* Created on 18/Dez/2004
*
* TODO
*/
package utilitarios;

import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.cfg.Configuration;

public class Sessao {

    private static final SessionFactory sessionFactory;

    static {
        try {
            // Create the SessionFactory
            sessionFactory = new Configuration().configure()
                    .buildSessionFactory();
        }
        catch (HibernateException ex) {
            throw new RuntimeException(" problema de Configuração: "
                    + ex.getMessage(), ex);
        }
    }

    public static final ThreadLocal session = new ThreadLocal();

    public static Session currentSession() throws HibernateException {
        Session s = (Session) session.get();
        // Open a new Session, if this Thread has none yet
        if (s == null || !s.isOpen()) { // HERE I CHANGED
            s = sessionFactory.openSession();
            session.set(s);
        }
        return s;
    }

    public static void closeSession() throws HibernateException {
        Session s = (Session) session.get();
        session.set(null);
        if (s != null) {
            s.close();
        }
    }
}

what i ask is
1) if what i did is aceptable
2) where can i find in book a way to reopen a session - i'm using a standalone app - no web involved, just one single user
thanks


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 Post subject:
PostPosted: Fri Dec 24, 2004 1:05 pm 
Regular
Regular

Joined: Sat May 29, 2004 2:16 pm
Posts: 81
maybe this test clarifies matters (why i had to alter HibernateUtil class)
Code:
    public void testSessaoAberta () throws HibernateException {
        Session sessao = Sessao.currentSession();
        Transaction t = sessao.beginTransaction();
        t.commit();
        sessao.close();
        sessao = Sessao.currentSession();
        boolean esperado = false;
        boolean obtido= sessao.isOpen();
        assertEquals("a sessao está fechada...",esperado,obtido );
    }

because i want the session to be open for next user input


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