一对一注解配置

                                                        一对一注解配置

package cn.happy.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table
public class IdCard {
    
    @Id
    @Column(length=18)
    private String cid;
    @Column
    private String cname;
    
    @OneToOne
    @JoinColumn(name="stu_id")
    private Student stu;

    public String getCid() {
        return cid;
    }

    public void setCid(String cid) {
        this.cid = cid;
    }

    public String getCname() {
        return cname;
    }

    public void setCname(String cname) {
        this.cname = cname;
    }

    public Student getStu() {
        return stu;
    }

    public void setStu(Student stu) {
        this.stu = stu;
    }
}

package cn.happy.entity;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table
public class Student {
   
    @Id
    @GeneratedValue
    private Integer sid;
    @Column
    private String sname;
    
    @OneToOne(cascade={CascadeType.ALL})
    @JoinColumn(name="card_id")
    private IdCard card;

    public Integer getSid() {
        return sid;
    }

    public void setSid(Integer sid) {
        this.sid = sid;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public IdCard getCard() {
        return card;
    }

    public void setCard(IdCard card) {
        this.card = card;
    }
    
}

Session session=null;
    Transaction tx=null;
     @Before
     public void mybefore(){
          SessionFactory sf=new AnnotationConfiguration().configure().buildSessionFactory();
           session = sf.openSession();
           tx = session.beginTransaction();
     }
     @After
     public void myafter(){
         session.close();
     }
     
    
     /**
      * 一对一双向配置
      * **/
     @Test
     public void onetoone(){
         Student stu=new Student();
         stu.setSname("张一鸣");
         
         
         IdCard card=new IdCard();
         card.setCid("123456789789456123");
         card.setCname("张一鸣");
         card.setStu(stu);
         stu.setCard(card);
         
         session.save(stu);
         tx.commit();
     }