Hibernate 单向多对一关联(不使用中间表)

最新推荐文章于 2025-07-28 23:27:29 发布

原创最新推荐文章于 2025-07-28 23:27:29 发布 · 164 阅读

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#hibernate #多对一 #many2one #中间表

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本文详细介绍了如何使用Java语言定义People类和Address类，并通过XML文件进行数据库映射，实现了一对多的关系。

有很多人(People)都在同一个地方(Address)

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 Address address;
	
	

	public Address getAddress() {
		return address;
	}
	public void setAddress(Address address) {
		this.address = address;
	}
	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;
	}
	
}

many2one_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="PeopleMany2OneWithout">
		<id name="id" column="p_id">
			<generator class="native"></generator>
		</id>
		<property name="name"></property>
		<many-to-one name="address" column="a_id"  class="com.hb.po.Address" not-null="true"></many-to-one>
	</class>
	
	<class name="com.hb.po.Address" table="AddressMany2OneWithout">
		<id name="id" column="a_id">
			<generator class="native"></generator>
		</id>
		<property name="addressDesc"></property>
	</class>
	
</hibernate-mapping>