Hibernate一对一主键双向关联映射(Annotation配置)

Hibernate一对一主键双向关联映射(Annotation配置)

实体
Husband

package  com.hibernate.one2one.bean;

import  javax.persistence.Column;
import  javax.persistence.Entity;
import  javax.persistence.GeneratedValue;
import  javax.persistence.GenerationType;
import  javax.persistence.Id;
import  javax.persistence.OneToOne;
import  javax.persistence.PrimaryKeyJoinColumn;
import  javax.persistence.Table;

@Entity
@Table(name = " husband " )
public   class  Husband {
    
     private   int  id;
     private  String name;
     private  Wife wife;
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = " id " )
     public   int  getId() {
         return  id;
    }
     public   void  setId( int  id) {
         this .id  =  id;
    }
    @Column(name = " name " )
     public  String getName() {
         return  name;
    }
     public   void  setName(String name) {
         this .name  =  name;
    }
    @OneToOne
    @PrimaryKeyJoinColumn
     public  Wife getWife() {
         return  wife;
    }
     public   void  setWife(Wife wife) {
         this .wife  =  wife;
    }
    
}

Wife

package  com.hibernate.one2one.bean;

import  javax.persistence.Column;
import  javax.persistence.Entity;
import  javax.persistence.Id;
import  javax.persistence.OneToOne;
import  javax.persistence.PrimaryKeyJoinColumn;
import  javax.persistence.Table;

@Entity
@Table(name = " wife " )
public   class  Wife {
    
     private   int  id;
     private  String name;
     private  Husband husband;
    @Id
    @Column(name = " id " )
     public   int  getId() {
         return  id;
    }
     public   void  setId( int  id) {
         this .id  =  id;
    }
    @Column(name = " name " )
     public  String getName() {
         return  name;
    }
     public   void  setName(String name) {
         this .name  =  name;
    }
    @OneToOne(optional = false )
    @PrimaryKeyJoinColumn
     public  Husband getHusband() {
         return  husband;
    }
     public   void  setHusband(Husband husband) {
         this .husband  =  husband;
    }
    
}

温馨提示:注意wife.java里面的@OneToOne(optional=false)   optional=false  属性会在wife这端添加一个外键约束
添加上上述属性使用hbm2ddl导出表，打印出的sql语句

alter   table  wife 
         drop  
         foreign   key  FK37AF11D67CB035

     drop   table   if   exists  husband

     drop   table   if   exists  wife

     create   table  husband (
        id  integer   not   null  auto_increment,
        name  varchar ( 255 ),
         primary   key  (id)
    )

     create   table  wife (
        id  integer   not   null ,
        name  varchar ( 255 ),
         primary   key  (id)
    )

     alter   table  wife 
         add   index  FK37AF11D67CB035 (id), 
         add   constraint  FK37AF11D67CB035 
         foreign   key  (id) 
         references  husband (id)

@Test
     public   void  insert(){
        Session session = HibernateSessionFactory.getSession();
        Transaction transaction = session.beginTransaction();
         try  {
            transaction.begin();
            Husband husband = new  Husband();
            husband.setName( " 小明 " );
            session.save(husband);
            Wife wife = new  Wife();
            wife.setName( " 如花 " );
            wife.setHusband(husband);
            wife.setId(husband.getId());
            session.save(wife);
            transaction.commit();
        }  catch  (HibernateException e) {
            e.printStackTrace();
            transaction.rollback();
        }
    }

@Test
     public   void  insert(){
        Session session = HibernateSessionFactory.getSession();
        Transaction transaction = session.beginTransaction();
         try  {
            transaction.begin();
            Husband husband = new  Husband();
            husband.setName( " 小明 " );
            session.save(husband);
            Wife wife = new  Wife();
            wife.setName( " 如花 " );
            wife.setHusband(husband);
            wife.setId(husband.getId());
            session.save(wife);
            transaction.commit();
        }  catch  (HibernateException e) {
            e.printStackTrace();
            transaction.rollback();
        }
    }

温馨提醒:此处必须同时设置
wife.setHusband(husband);
wife.setId(husband.getId());
否则报org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update

示例程序