Hibernate关联关系映射-----基于连接表的单向一对多映射配置

package uni.one2many.jointable;

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

public class Emperor {
private int id;
private String name;
private Set<Minister> ministers = new HashSet<Minister>();

public Emperor() {

}

public Emperor(int id, String name, Set<Minister> ministers) {
super();
this.id = id;
this.name = name;
this.ministers = ministers;
}

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<Minister> getMinisters() {
return ministers;
}

public void setMinisters(Set<Minister> ministers) {
this.ministers = ministers;
}

}

package uni.one2many.jointable;

public class Minister {
private int id;
private String name;

public Minister() {

}

public Minister(int id, String name) {
super();
this.id = id;
this.name = 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;
}

}

<hibernate-mapping>
<class name="uni.one2many.jointable.Emperor">
<id name="id" column="did">
<generator class="native" />
</id>
<property name="name" type="string" column="name"></property>

<!-- confirure the uniredirection association -->
<set name="ministers" table="emperorminister" >
<key column="did" not-null="true"></key>
<many-to-many column="mid" unique="true" class="uni.one2many.jointable.Minister"/>
</set>
</class>

</hibernate-mapping>
<hibernate-mapping>
<class name="uni.one2many.jointable.Minister">
<id name="id" column="did">
<generator class="native" />
</id>
<property name="name" type="string" column="name"></property>
</class>

</hibernate-mapping>

public class Test {

@org.junit.Test
public void testAdd() {
SessionFactory sf = HibernateUtil.getSessionFactory();
Session session = sf.getCurrentSession();
session.beginTransaction();

Minister m1 = new Minister();
m1.setName("廉颇");

Minister m2 = new Minister();
m2.setName("蔺相如");

Emperor emperor = new Emperor();
emperor.setName("齐威王");
emperor.getMinisters().add(m1);
emperor.getMinisters().add(m2);

session.save(emperor);
session.save(m1);
session.save(m2);
session.beginTransaction().commit();
}
}

Hibernate: insert into Emperor (name) values (?)
Hibernate: insert into Minister (name) values (?)
Hibernate: insert into Minister (name) values (?)
Hibernate: insert into emperorminister (did, mid) values (?, ?)
Hibernate: insert into emperorminister (did, mid) values (?, ?)