hibernate中多对多关系映射

案例：

person：一个人可以有担任很多项工作

job：一项工作可以由很多人担任

这在person和job中就形成了多对多的关系,映射成一张新表。

package com.pk.mapping;

import java.util.HashSet;
import java.util.Set;

public class Job {
	private int id;
	private String jobname;
	private Set people=new HashSet();
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getJobname() {
		return jobname;
	}
	public void setJobname(String jobname) {
		this.jobname = jobname;
	}
	public Set getPeople() {
		return people;
	}
	public void setPeople(Set people) {
		this.people = people;
	}
	
	
}

package com.pk.mapping;

import java.util.HashSet;
import java.util.Set;

public class People {
	private int id;
	private String name;
	private Set jobs=new HashSet();
	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 Set getJobs() {
		return jobs;
	}
	public void setJobs(Set jobs) {
		this.jobs = jobs;
	}
	
	
	
}

<?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.pk.mapping">

	<class name="Job" table="t_job">
		<id name="id" column="t_job_id">
			<generator class="native"></generator>
		</id>
		<property name="jobname" column="t_job_name"></property>
		
		<set name="people" table="t_job_people" >

<!--外键，必须以本表的id作为参照物-->
			<key column="job_id"></key>
			<many-to-many class="People" column="people_id" />
		</set>
		
	</class>

	
</hibernate-mapping>

<?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.pk.mapping">

	<class name="People" table="t_people">
		<id name="id" column="t_people_id">
			<generator class="native"></generator>
		</id>
		<property name="name" column="t_people_name"></property>
		
		<set name="jobs" table="t_job_people">
			<key column="people_id"></key>
			<many-to-many class="Job" column="job_id"></many-to-many>
		</set>
		
	</class>
	
</hibernate-mapping>