hibernate框架一对多级联删除例子（十三）

一、hibernate不级联删除

	/**
	 * 不级联删除：删除客户，客户下有2个联系人
	 */
	@Test
	public void run6() {
		Session session = HibernateUtils.getCurrentSession();
		Transaction tx = session.beginTransaction();

		Customer c1 = session.get(Customer.class, 1L);
		session.delete(c1);

		tx.commit();
	}

hibernate会先把外键的约束删除掉，然后再删除客户，联系人没有删除。

二、hibernate级联删除——一级联多

2.1 配置级联删除

2.2 测试代码

	/**
	 * 级联删除：删除客户，级联删除客户下的联系人
	 */
	@Test
	public void run7() {
		Session session = HibernateUtils.getCurrentSession();
		Transaction tx = session.beginTransaction();

		Customer c1 = session.get(Customer.class, 1L);
		session.delete(c1);

		tx.commit();
	}

2.3 执行结果

客户和客户相关的联系人都删除了

看打印的sql语句

log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Hibernate: 
    select
        customer0_.cust_id as cust_id1_0_0_,
        customer0_.cust_name as cust_nam2_0_0_,
        customer0_.cust_user_id as cust_use3_0_0_,
        customer0_.cust_create_id as cust_cre4_0_0_,
        customer0_.cust_source as cust_sou5_0_0_,
        customer0_.cust_industry as cust_ind6_0_0_,