如果cascade属性是默认值"none",当hibernate删除一个持久化对象的时候,不会自动删除与它关联的其他持久化对象。如果希望自动删除它关联的其他持久化对象,可以把casacde属性设为"delete";
<set name="students" cascade="delete" inverse="true"> <key column="school_id"/> <one-to-many class="Student"/> </set>
那么hibernate在删除一个Shool对象时,实际执行的SQL是:
delete from students where school_id =1; delete from school where id=1;