041：hibernate组件映射（Annotation）-优快云博客

本文详细介绍了在Husband.java中如何使用嵌入式注解将Wife.java对象嵌入到表中，包括类定义、属性映射及对应的配置文件设置，通过XML或注解方式实现对象关系映射。

在Husband.java中加入：

嵌入的意思，当前的对象是另一个对象嵌入进来的，它不是我们单独的需要，我们映射的表（即作为表的一部分嵌入到表里面）

这里是把Wife.java嵌入进来。

package com.bjsxt.hibernate;

import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinColumns;
import javax.persistence.OneToOne;

@Entity
public class Husband {
	private int id;
	private String name;
	private Wife wife;
	@Id
	@GeneratedValue
	public int getId() {
		return id;
	}
	
	public String getName() {
		return name;
	}
	@Embedded
	public Wife getWife() {
		return wife;
	}
	public void setId(int id) {
		this.id = id;
	}
	public void setName(String name) {
		this.name = name;
	}
	public void setWife(Wife wife) {
		this.wife = wife;
	}
	
}

package com.bjsxt.hibernate;



public class Wife {
	
	private String wifeName;
	private int age;
	
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
		
	public String getWifeName() {
		return wifeName;
	}
	public void setWifeName(String name) {
		this.wifeName = name;
	}
	
}

用于test类：

package com.bjsxt.hibernate;

import java.util.Date;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

public class HibernateORMappingTest {
	private static SessionFactory sessionFactory;
	
	//@BeforeClass
	public static void beforeClass() {
			sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
	}
	//@AfterClass
	public static void afterClass() {
		sessionFactory.close();
	}
	
	
	
	@Test
	public void testSchemaExport() {
		new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);
	}
	
	public static void main(String[] args) {
		beforeClass();
	}
}

对于hibernate.cfg.xml中需加：

<mapping class="com.bjsxt.hibernate.Husband"/>

**********************************************

若用xml

在Husband.hbm.xml中

<?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.Husband" >
		<id name="id">
			<generator class="native"></generator>
		</id>
		
		<property name="name"></property>
		<component name="wife">
			<property name="wifeName"></property>
			<property name="age"></property>
		</component>
    </class>
	
</hibernate-mapping>

相应的hibernate.cfg.xml中：

 <mapping resource="com/bjsxt/hibernate/Husband.hbm.xml"/>