/*
更新客户操作
merge(Object)
*/
@Test
public void testUpdate(){
//1、通过工具类获取entityManager
EntityManager entityManager = JpaUtils.getEntityManager();
//2、开启事务
EntityTransaction tx = entityManager.getTransaction();
tx.begin();
//3、更新操作
//(1)查询客户
Customer customer = entityManager.find(Customer.class, 1l);
//(2)更新客户
customer.setCustIndustry("it教育");
entityManager.merge(customer);
//4、提交事务
tx.commit();
//5、释放资源
entityManager.close();
}