Hibernate 单向一对多关联(不使用中间表)

最新推荐文章于 2021-02-21 09:43:20 发布

原创最新推荐文章于 2021-02-21 09:43:20 发布 · 426 阅读

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#hibernate #one2many #一对多 #中间表

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本文介绍了一个简单的Java程序示例，展示了如何通过Hibernate框架实现一对多的关系映射。具体包括People类与Address类之间的关系定义，以及相应的Hibernate配置文件。

一个人(People)有多个地址（Address），例如出生地，工作地。

People.java

/**
 * 
 */
package com.hb.po;

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

/**
 * @author dudong0726
 *
 * @date 2011-11-9 上午10:51:17
 *
 */
public class People {

	private long id;
	private String name;
	private Set<Address> addresses = new HashSet<Address>();
	

	public Set<Address> getAddresses() {
		return addresses;
	}
	public void setAddresses(Set<Address> addresses) {
		this.addresses = addresses;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
	public long getId() {
		return id;
	}
	public void setId(long id) {
		this.id = id;
	}
	
	
	
	
}

Address.java

/**
 * 
 */
package com.hb.po;

/**
 * @author dudong0726
 *
 * @date 2011-11-9 上午10:51:48
 *
 */
public class Address {

	private long id;
	private String addressDesc;
	
	
	public String getAddressDesc() {
		return addressDesc;
	}
	public void setAddressDesc(String addressDesc) {
		this.addressDesc = addressDesc;
	}
	public long getId() {
		return id;
	}
	public void setId(long id) {
		this.id = id;
	}
	
}

one2many_without.hbm.xml

<?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.hb.po.People" table="PeopleOne2ManyWithout">
		<id name="id" column="p_id">
			<generator class="native"></generator>
		</id>
		<property name="name"></property>
		<set name="addresses">
			<key column="p_id"></key>
			<one-to-many class="com.hb.po.Address"/>
		</set>
	</class>
	
	<class name="com.hb.po.Address" table="AddressOne2ManyWithout">
		<id name="id" column="a_id">
			<generator class="native"></generator>
		</id>
		<property name="addressDesc"></property>
	</class>
	
</hibernate-mapping>