把实体从一个数据库复制到另一个数据库

方法1： 
写代码从sessionFactory1中取实体，然后在sessionFactory2中保存实体 

方法2： 
Session session1 = sessionFacory1.openSession(); 
Transaction tx1 = session1.beginTransaction(); 
Customer customer = (Customer)session1.get(Customer.class, 1L)); 
tx1.commit(); 
session1.close(); 

Session session2 = sessionFactory2.openSession(); 
Transaction tx2 = session2.beginTransaction(); 
//把Customer对象复制到第二个数据库存储源中 
session2.replicate(customer, ReplicationMode.LASTEST_VERSION); 
tx2.commit(); 
session2.close();