hibernate中方建立表之间的关系

在hibernate中表之间存在一对一，一对多等关系，怎样配置这些属性的，下面来介绍一下这些知识

一对多关系:比如一个班级对用多个学生

班级实体类：

package entity;

import java.util.Set;

public class Clazz {

//实现1对多一个班级对应多个学生

private int id;

private String name;

private entity.Student Student=new Student();

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public entity.Student getStudent() {

return Student;

}

public void setStudent(entity.Student student) {

Student = student;

}

}

学生实体类：

package entity;

public class Student {

private int id;

private String name;

private float score;

private Clazz clazz;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public Clazz getClazz() {

return clazz;

}

public void setClazz(Clazz clazz) {

this.clazz = clazz;

}

public void setName(String name) {

this.name = name;

}

public float getScore() {

return score;

}

public void setScore(float score) {

this.score = score;

}

}

班级对应的配置

<hibernate-mapping>

<class name="entity.Clazz" table="clazz">

<id name="id">

<generator class="native" />

</id>

<property name="name" column="clazz_name" type="string"/>

<set name="student" inverse="true">

<key>

<column name="cid"/>

</key>

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

</set>

</class>

</hibernate-mapping>

学生对应的配置：

<hibernate-mapping>

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

<id name="id">

<generator class="native" />

</id>

<property name="name" column="user_name" type="string"/>

<property name="score" column="user_score" type="float"/>

<many-to-one name="clazz" class="entity.Clazz" cascade="all">

<column name="cid"/>

</many-to-one>

</class>

</hibernate-mapping>

需要注意的是再班级和学生配置过程中属性的name要与实体之间对应。