Hibernate关联关系映射-----基于连接表的单向一对多映射配置

2014/12/27 15:52
阅读数 36

实体:

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;
	}

}

  

hbm配置文件:

<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>

  

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);
		emperor.getMinisters().add(m2);
		
		session.save(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) values (?)
Hibernate: insert into Minister (name) values (?)
Hibernate: insert into emperorminister (did, mid) values (?, ?)
Hibernate: insert into emperorminister (did, mid) values (?, ?)

  



展开阅读全文
打赏
0
0 收藏
分享
加载中
更多评论
打赏
0 评论
0 收藏
0
分享
返回顶部
顶部