3.hibernate联合主键,xml映射

package com.bjsxt.hibernate;

public class StudentPK implements java.io.Serializable{
	private int id;
	private String name;
	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;
	}
	
	@Override
	public boolean equals(Object o) {
		if(o instanceof StudentPK) {
			StudentPK pk = (StudentPK)o;
			if(this.id == pk.getId() && this.name.equals(pk.getName())) {
				return true;
			}
		}
		return false;
	}
	
	@Override
	public int hashCode() {
		return this.name.hashCode();
	}
}

package com.bjsxt.hibernate;

public class Student {
	
	private StudentPK pk;
	
	private int age;
	private String sex;
	private boolean good;
	public boolean isGood() {
		return good;
	}
	public void setGood(boolean good) {
		this.good = good;
	}
	/*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 int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public StudentPK getPk() {
		return pk;
	}
	public void setPk(StudentPK pk) {
		this.pk = pk;
	}
	
	
}

<?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>
	<class name="com.bjsxt.hibernate.Student">
		
			
		<composite-id name="pk" class="com.bjsxt.hibernate.StudentPK">
			<key-property name="id"></key-property>
			<key-property name="name"></key-property>
		</composite-id>
		
		<property name="age" />
		<property name="sex" />
		<property name="good" type="yes_no"></property>
    </class>
	
</hibernate-mapping>