实体：
package bi.one2many;
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 bi.one2many;
public class Minister {
private int id;
private String name;
private Emperor emperor;
public Minister() {
}
public Minister(int id, String name, Emperor emperor) {
super();
this.id = id;
this.name = name;
this.emperor = emperor;
}
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 Emperor getEmperor() {
return emperor;
}
public void setEmperor(Emperor emperor) {
this.emperor = emperor;
}
}
hbm配置文件：
<hibernate-mapping>
<class name="bi.one2many.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" inverse="true" cascade="all">
<key column="did" not-null="true"></key>
<one-to-many class="bi.one2many.Minister"/>
</set>
</class>
</hibernate-mapping>
<hibernate-mapping>
<class name="bi.one2many.Minister">
<id name="id" column="mid">
<generator class="native" />
</id>
<property name="name" type="string" column="name"></property>
<many-to-one name="emperor" column="did" cascade="all"></many-to-one>
</class>
</hibernate-mapping>
测试文件：
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);
//session.save(emperor);
m1.setEmperor(emperor);
m2.setEmperor(emperor);
session.save(m1);
session.save(m2);
session.beginTransaction().commit();
}
}
测试结果：
Hibernate: insert into Emperor (name) values (?)
Hibernate: insert into Minister (name, did) values (?, ?)
Hibernate: insert into Minister (name, did) values (?, ?)
在双向关联关系配置中有inverse属性和cascade属性比较让人迷糊，不过参看一下这个文章写得蛮清楚的：
http://www.cnblogs.com/focusj/archive/2011/03/23/2057603.html。