Hibernate 一对一双向关联深入认识

发布时间：2021-11-22 11:59:45 所属栏目：教程来源：互联网

导读：1、一对一相对比较简单。hibernate主要是帮助我们保持了两张表的id一致！先建两张表 create table h_01.idcard (id integer not null, num integer, primary key (id)); create table h_01.student (id integer not null, name varchar(255), primary key (

1、一对一相对比较简单。hibernate主要是帮助我们保持了两张表的id一致！

先建两张表

create table h_01.idcard (id integer not null, num integer, primary key (id));
create table h_01.student (id integer not null, name varchar(255), primary key (id));
然后是POJO

package modle;

public class IdCard {
    private int id;
    private int num;
    private Student student;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getNum() {
        return num;
    }
    public void setNum(int num) {
        this.num = num;
    }
    public Student getStudent() {
        return student;
    }
    public void setStudent(Student student) {
        this.student = student;
    }
}

package modle;

public class Student {
    private int id;
    private String name;
    private IdCard idCard;
    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;
    }
    public IdCard getIdCard() {
        return idCard;
    }
    public void setIdCard(IdCard idCard) {
        this.idCard = idCard;
    }

}

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