直接上菜：
dept.hbm.xml：关键点标蓝色这部分，inverse表示放弃维护外键关系，cascade就不用说了
<hibernate-mapping package="com.cissst.it.dept.entity"> ???<class name="Dept" table="DEPT1"> ???????<id name="deptno" column="DEPTNO"> ???????????<generator class="native"></generator> ???????</id> ???????<property name="dname" column="DNAME"></property> ???????<set name="emps" inverse="true" cascade="save-update,delete"> ???????????<key column="deptno"></key> ???????????<one-to-many class="com.cissst.it.emp.entity.Emp" /> ???????</set> ???</class></hibernate-mapping>
emp.hbm.xml
<hibernate-mapping package="com.cissst.it.emp.entity"> ???<class name="Emp" table="EMP1"> ???????<id name="empno" column="EMPNO"> ???????????<generator class="native"></generator> ???????</id> ???????<property name="ename" column="ENAME"></property> ???????<property name="job" column="JOB"></property> ???????<many-to-one name="dept" class="com.cissst.it.dept.entity.Dept"/> ???</class> ???</hibernate-mapping>
测试类：
???public static void main(String[] args) { ???????//级联保存 ???????Session session = SessionUtil.openSession(); ???????Transaction tx = session.getTransaction(); ???????tx.begin(); ???????Dept dept = new Dept(); ???????dept.setDname("develop"); ???????Emp emp1 = new Emp(); ???????emp1.setEname("PECOOL"); ???????emp1.setJob("CODE"); ???????Emp emp2 = new Emp(); ???????emp2.setEname("PHOEBE"); ???????emp2.setJob("PHOTO"); ???????HashSet<Emp> set = new HashSet<Emp>(); ???????set.add(emp1); ???????set.add(emp2); ???????dept.setEmps(set); ???????session.save(dept); ???????tx.commit(); ???????session.close(); ???}result:
只需要保存dept对象，dept中的emp对象也会得到保存，一般1方放弃维护外键关系有助于改善性能，发现sql中明显少了update语句。
hibernate---级联保存、级联删除
原文地址：https://www.cnblogs.com/pecool/p/9690996.html