一对一双向外键关联

首先在程序里面写成双向的，husband里面有wife的引用，wife里面也有husband的引用。

package hjj.lch.hibernate.model;

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

@Entity
public class Wife {
	private int id;
	private String name;
	private Husband husband;
	
	@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(mappedBy="wife") // Husband那个类里面，wife属性已经做映射了
	public Husband getHusband() {
		return husband;
	}
	public void setHusband(Husband husband) {
		this.husband = husband;
	}
	

}

 凡是双向关联，必设mappedBy。

 

在xml里面怎么设呢？

<one-to-one name="StuIdCard" property-ref="student"></one-to-one>

property-ref="student"是指映射是在StuIdCard这个类的student属性是做了。