public class Student {

    private Integer studentId;

    private String studentName;

    private Classes classes;

}

public class Classes{

    private Integer classId;

    private String className;

    private Set<Student> students = new HashSet<Student>();

}

Student.hbm.xml

XML code

<hibernate-mapping package="wxm.beans">

<class name="Student" table="student">

<id name="studentId" type="integer" column="student_id">

<generator class="identity" />

</id>

<property name="studentName" length="20" not-null="true"

column="student_name" />

<property name="perform" />

<many-to-one name="classes" column="class_id"

outer-join="true" class="wxm.beans.Classes" />

</class>

</hibernate-mapping>

Classes.hbm.xml

XML code

<hibernate-mapping package="wxm.beans">

<class name="Classes" table="t_class">

<id name="classId" type="integer" column="class_id">

<generator class="identity" />

</id>

<property name="className" length="20" not-null="true"

column="class_name" />

<set name="students" outer-join="true" inverse="true">

<key column="class_id" />

<one-to-many class="wxm.beans.Student" />

</set>

</class>

</hibernate-mapping>

public void save() {

    Classes claz = new Classes("英语班");

    classService.addClass(claz);

    Student student = new Student("王小二");

    student.setClasses(classService.getClass(1));

    student.setPerform(55.5f);

    studentService.addStudent(student);

}

public void delClass() {

    classService.getClass(1).getStudents().remove(

    studentService.getStudent(1));

    classService.delClass(1);

}