联合主键关联

 @JoinColumns()

Husband 和 Wife 是一对一的关系，并且 Wife 的 id和name字段是联合主键。

Annotation 配置：

　　WifePK

package com.bjsxt.hibernate;

public class WifePK {
    
    private Integer id;
    
    private String name;
    
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

　　Wife

package com.bjsxt.hibernate;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.IdClass;

@Entity
@IdClass(value=WifePK.class)//使用第三种联合主键配置方法
public class Wife {
    
    private Integer id;
    
    private String name;
    
    private int age;

    @Id
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @Id
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

　　Husband

package com.bjsxt.hibernate;

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 Integer id;
    
    private String name;

    private Wife wife;
    
    @Id
    @GeneratedValue
    public Integer getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    @OneToOne//一对一的关系
    //JoinColumns 配置也可以不加，hibernate 会自动帮我们加
    @JoinColumns(
            {
                @JoinColumn(name="wifeId",referencedColumnName="id"),
                @JoinColumn(name="wifeName",referencedColumnName="name")
            }
    )
    public Wife getWife() {
        return wife;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setWife(Wife wife) {
        this.wife = wife;
    }
}

XML 配置：

　　参考 ID 生成策略的最后一部分XML联合主键的生成。

jar包链接: https://pan.baidu.com/s/1nvHiUfv 密码: fjuy

代码链接: https://pan.baidu.com/s/1sl4j0Vr 密码: nnf6