双向一对一外键关联annotationl配置

最新推荐文章于 2025-07-30 15:00:37 发布

最新推荐文章于 2025-07-30 15:00:37 发布 · 100 阅读

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#双向外键关联 annotation

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本文深入探讨了Java中实体类Husband和Wife之间的关联关系，通过使用JPA注解展示了如何实现一对多的关系映射。

po类Husband.java

package com.hibernate.demo.po;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
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 void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	@OneToOne
	@JoinColumn(name="wife_id")
	public Wife getWife() {
		return wife;
	}
	public void setWife(Wife wife) {
		this.wife = wife;
	}
	
	
}

po类Wife

package com.hibernate.demo.po;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToOne;

/**
 * 凡是双向外键关联，一定设置mappedBy
 * @author apprentice
 *
 */
@Entity
public class Wife {
	private int id;
	private String name;
	private Husband husband;
	
	@OneToOne(mappedBy="wife")	//Husband是主导
	public Husband getHusband() {
		return husband;
	}
	public void setHusband(Husband husband) {
		this.husband = husband;
	}
	@Id
	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;
	}
}