hibernate映射的一些疑惑

1.一对多
	一对多是站在多的一方中映射xml中来分析的,比如:teacher.hbm.xml
		<set name="student" inverse="false" lazy="false" cascade="all-delete-orphan" order-by="resourceId">
			<key>
				<column name="teacher_id"></column>
			</key>
			<one-to-many class="org.onetomany.Student/>
		</set>
2.多对一
	多对一是站在多的一方中映射xml中来分析的,比如:student.hbm.xml
	<many-to-one name="teacher" class="org.onetomany.Teacher">
			<column name="teacher_id"></column>
		</many-to-one>
3.一对一
  <one-to-one name="student" class="org.onetoone.Student" cascade="all"/>

  <one-to-one name="teacher" class="org.onetoone.Teacher" cascade="all"/>