Hibernate学习笔记---------------多对多关系

多对多关系，如：老师有多个学生，学生有多个老师的关系；

Teacher.hbm.xml------------->

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.xx.domain">
	<class name="Teacher" table="t_teacher">
		<id name="id">
			<generator class="native"/>
		</id>
		<property name="name"/>
		<!-- 从中间表student_teacher通过外键teacherid查找sutdentid，根据studentid查找sudent -->
		<!-- teacher——（通过teacherid）——》student_teacher——（通过studentid）——》student -->
		<set name="students" table="student_teacher">
			<key column="teacherid"/>
			<many-to-many class="Student" column="studentid"/>
		</set>
	</class>
</hibernate-mapping>

Student.hbm.xml------------->

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.xx.domain">
	<class name="Student" table="t_student">
		<id name="id">
			<generator class="native"/>
		</id>
		<property name="name"/>
		<set name="teachers" table="student_teacher">
			<key column="studentid"/>
			<many-to-many class="Teacher" column="teacherid"/>
		</set>
	</class>
</hibernate-mapping>