package com.rlovep.one2many;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import org.hibernate.Session;
import org.junit.Test;
public class App_session {
private static SessionFactory sf=null;
static{
Configuration config=new Configuration().configure().addClass(Dept.class).addClass(Employee.class);
//创建serviceRegistry 代替buildSessionFactory()方法
ServiceRegistry serviceRegistry =new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry();
// 创建session的工厂对象
sf = config.buildSessionFactory(serviceRegistry);
}
@Test
public void testSession() throws Exception {
//openSession: 创建Session, 每次都会创建一个新的session
Session session1 = sf.openSession();
Session session2 = sf.openSession();
System.out.println(session1 == session2);
session1.close();
session2.close();
//getCurrentSession 创建或者获取session
// 线程的方式创建session
// 一定要配置:<property name="hibernate.current_session_context_class">thread</property>
Session session3 = sf.getCurrentSession();// 创建session,绑定到线程
Session session4 = sf.getCurrentSession();// 从当前访问线程获取session
System.out.println(session3 == session4);
// 关闭 【以线程方式创建的session,可以不用关闭; 线程结束session自动关闭】
//session3.close();
//session4.close(); 报错,因为同一个session已经关闭了!
}
}