无 XML 的 Hibernate 配置

这个例子来自这里

package com.reborne.SmartHibernateConnector.utils;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class LiveHibernateConnector implements IHibernateConnector {

    private String DB_DRIVER_NAME = "";
    private String DB_URL = "jdbc:h2:~/liveDB;MV_STORE=FALSE;MVCC=FALSE";
    private String DB_USERNAME = "sa";
    private String DB_PASSWORD = "";
    private String DIALECT = "org.hibernate.dialect.H2Dialect";
    private String HBM2DLL = "create";
    private String SHOW_SQL = "true";
    
    private static Configuration config;
    private static SessionFactory sessionFactory;
    private Session session;
    
    private boolean CLOSE_AFTER_TRANSACTION = false;

    public LiveHibernateConnector() {
        
        config = new Configuration();

        config.setProperty("hibernate.connector.driver_class",         DB_DRIVER_NAME);
        config.setProperty("hibernate.connection.url",                 DB_URL);
        config.setProperty("hibernate.connection.username",         DB_USERNAME);
        config.setProperty("hibernate.connection.password",         DB_PASSWORD);
        config.setProperty("hibernate.dialect",                     DIALECT);
        config.setProperty("hibernate.hbm2dll.auto",                 HBM2DLL);
        config.setProperty("hibernate.show_sql",                    SHOW_SQL);
    
        /*
         * Config connection pools
         */

        config.setProperty("connection.provider_class", "org.hibernate.connection.C3P0ConnectionProvider");
        config.setProperty("hibernate.c3p0.min_size", "5");
        config.setProperty("hibernate.c3p0.max_size", "20");
        config.setProperty("hibernate.c3p0.timeout", "300");
        config.setProperty("hibernate.c3p0.max_statements", "50");
        config.setProperty("hibernate.c3p0.idle_test_period", "3000");
        
        
        /**
         * Resource mapping
         */
        
//        config.addAnnotatedClass(User.class);
//        config.addAnnotatedClass(User.class);
//        config.addAnnotatedClass(User.class);
    
        sessionFactory = config.buildSessionFactory();
    }

    public HibWrapper openSession() throws HibernateException {
        return new HibWrapper(getOrCreateSession(), CLOSE_AFTER_TRANSACTION);
    }

    public Session getOrCreateSession() throws HibernateException {
        if (session == null) {
            session = sessionFactory.openSession();
        }
        return session;
    }

    public void reconnect() throws HibernateException {
        this.sessionFactory = config.buildSessionFactory();
    }

    
}

请注意，使用最新的 Hibernate 这种方法效果不佳（Hibernate 5.2 版本仍允许此配置）