hibernatesessionfactory.java

近几年来

package tarena.util;

import java.sql.Connection;

import org.hibernate.*;
import org.hibernate.cfg.*;

public class HibernateSessionFactory {

    private static String CONFIG_FILE_LOCATION = "/tarena/util/hibernate.cfg.xml";
    private static final ThreadLocal threadLocal = new ThreadLocal();
    private static final Configuration cfg = new Configuration();

    /** The single instance of hibernate SessionFactory */
    private static SessionFactory sessionFactory;

    public static Session currentSession() throws HibernateException {
        Session session = (Session) threadLocal.get();

        if (session == null) {
            if (sessionFactory == null) {
                try {
                    cfg.configure(CONFIG_FILE_LOCATION);
                    sessionFactory = cfg.buildSessionFactory();
                }
                catch (Exception e) {
                    System.err.println("%%%% Error Creating SessionFactory %%%%");
                    e.printStackTrace();
                }
            }
            session = sessionFactory.openSession();
            threadLocal.set(session);
        }

        return session;
    }

    public static Session currentSession(Connection conn) throws HibernateException {
        Session session = (Session) threadLocal.get();

        if (session == null) {
            if (sessionFactory == null) {
                try {
                    cfg.configure(CONFIG_FILE_LOCATION);
                    sessionFactory = cfg.buildSessionFactory();
                }
                catch (Exception e) {
                    System.err.println("%%%% Error Creating SessionFactory %%%%");
                    e.printStackTrace();
                }
            }
            session = sessionFactory.openSession(conn);
            threadLocal.set(session);
        }

        return session;
    }
    
    public static void closeSession() throws HibernateException {
        Session session = (Session) threadLocal.get();
        threadLocal.set(null);

        if (session != null) {
            session.close();
        }
    }
    private HibernateSessionFactory() {
    }
}