package com.rlovep.one2many;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import org.junit.Test;
public class AppCache2 {
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);
}
// 1. 测试二级缓存的使用
// 没有/有用 二级缓存
@Test
public void testCache() {
Session session1 = sf.openSession();
session1.beginTransaction();
// a. 查询一次
Dept dept = (Dept) session1.get(Dept.class, 1);
dept.getEmps().size();// 集合
session1.getTransaction().commit();
session1.close();
System.out.println("------");
// 第二个session
Session session2 = sf.openSession();
session2.beginTransaction();
// a. 查询一次
dept = (Dept) session2.get(Dept.class, 1); // 二级缓存配置好; 这里不查询数据库
dept.getEmps().size();
session2.getTransaction().commit();
session2.close();
}
@Test
public void listCache() {
Session session1 = sf.openSession();
session1.beginTransaction();
// HQL查询 【setCacheable 指定从二级缓存找,或者是放入二级缓存】
Query q = session1.createQuery("from Dept").setCacheable(true);
System.out.println(q.list());
session1.getTransaction().commit();
session1.close();
Session session2 = sf.openSession();
session2.beginTransaction();
q = session2.createQuery("from Dept").setCacheable(true);
System.out.println(q.list()); // 不查询数据库: 需要开启查询缓存
session2.getTransaction().commit();
session2.close();
}
}