一对一双向外键关联：双方都持有对方的外键关联关系。

　　主控方和一对一单向外键关联的情况是一样的，主要的差异表现为，被空方需要添加：

　　@OneToOne(mappedBy="card") //被控方

　　主控方必须交给其中的一方去控制，因为不可以双方都同时拥有控制对方的权利，假如是这样的话是没有办法保存成功的。这就是为什么需要指定mappenBy="card"的原因。

　　1、IdCard.java实体类:

package oto_bfk;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.OneToOne;

import org.hibernate.annotations.GenericGenerator;

/*身份证类*/

@Entity

public class IdCard {

    private String pid;//身份证号

    private String sname;//学生姓名

    private Students stu;//持有主控方外键属性的引用

    @OneToOne(mappedBy="card")

    public Students getStu() {

        return stu;

    }

    public void setStu(Students stu) {

        this.stu = stu;

    }

    //无参数的构造器

    public IdCard()

    {

    }

    //带参数的构造器

    public IdCard(String pid, String sname) {

        super();

        this.pid = pid;

        this.sname = sname;

    }

    @Id//指定主键

    @Column(length=18)//指定身份证的长度

    //主键生成策略

    @GenericGenerator(name="pid",strategy="assigned")

    @GeneratedValue(generator="pid")

    public String getPid() {

        return pid;

    }

    public void setPid(String pid) {

        this.pid = pid;

    }

    public String getSname() {

        return sname;

    }

    public void setSname(String sname) {

        this.sname = sname;

    }

}

2、Students.java实体类:

package oto_bfk;

import java.io.Serializable;

import java.util.Date;

import javax.persistence.CascadeType;

import javax.persistence.Column;

import javax.persistence.Embedded;

import javax.persistence.EmbeddedId;

import javax.persistence.Entity; /*JPA注解*/

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.OneToOne;

import javax.persistence.Table;

import javax.persistence.Transient;

/**

 * 学生实体类

 * @author Administrator

 *

 */

//@Entity(name="t_students")

@Entity//表示这是一个实体类

//schema:表示数据库的名称

//name:表示数据库的表名

//Embedddable注解表示一个非Entity类，但是可以嵌入到另外一个实体类中作为属性而存在

public class Students implements Serializable{

    private IdCard card;

    private int sid;  //将学号改成字符串类型

    private String gender; //性别

    private Date birthday;//出生日期

    private String major;//专业

    public Students(IdCard card, String gender, Date birthday,

            String major) {

        super();

        this.card = card;

        this.sid = sid;

        this.gender = gender;

        this.birthday = birthday;

        this.major = major;

    }

    @OneToOne(cascade=CascadeType.ALL)//表示全 级联关系

    @JoinColumn(name="pid", unique=true)

    public IdCard getCard() {

        return card;

    }

    public void setCard(IdCard card) {

        this.card = card;

    }

    @Id

    @GeneratedValue//主键自增

    public int getSid() {

        return sid;

    }

    public void setSid(int sid) {

        this.sid = sid;

    }

    public String getGender() {

        return gender;

    }

    public void setGender(String gender) {

        this.gender = gender;

    }

    public Date getBirthday() {

        return birthday;

    }

    public void setBirthday(Date birthday) {

        this.birthday = birthday;

    }

    public String getMajor() {

        return major;

    }

    public void setMajor(String major) {

        this.major = major;

    }

    public Students()

    {

    }

}

3、hibernate.cfg.xml配置文件:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-configuration PUBLIC

        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<!-- old: http://hibernate.sourceforge.net/hibernate-configuration-3.6.dtd -->

<!-- new: http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd -->

<!--    : http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd -->

<hibernate-configuration>

<session-factory>

    <!-- 显示sql语句 -->

    <property name="show_sql">true</property>

    <property name="myeclipse.connection.profile">bookshop</property>

    <!-- <property name="connection.url">

        jdbc:mysql://localhost:3306/bookshop

        jdbc:mysql://localhost:3306/database?useUnicode=true&amp;characterEncoding=UTF-8

    </property> -->

    <property name="connection.url">jdbc:mysql://localhost:3306/hibernate?useUnicode=true&amp;characterEncoding=UTF-8</property>

    <property name="connection.username">root</property>

    <property name="connection.password">woaiwojia..123</property>

    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

    <property name="format_sql">true</property>

    <property name="hbm2ddl.auto">update</property>

    <property name="hibernate.current_session_context_class">thread</property>

    <!-- 将实体类映射到数据库 -->

    <!--

    <mapping class="oto_fk.Students"/>

    <mapping class="oto_fk.IdCard"/>

     -->

    <mapping class="oto_bfk.Students"/>

    <mapping class="oto_bfk.IdCard"/>

</session-factory>

</hibernate-configuration>

4、生成数据库表结构:

@Test

    public void testShemaExport(){

        //创建Hibernate配置对象

        Configuration configuration = new Configuration().configure();

        //创建服务注册对象

        ServiceRegistry serviceRegistry =

                new ServiceRegistryBuilder()

        .applySettings(configuration.getProperties())

        .buildServiceRegistry();

        //创建sessionFactory

        SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);

        //生成SchemaExport对象

        SchemaExport export = new SchemaExport(configuration);

        //调用schemaExport的create生成数据库表结构

        export.create(true, true);

    }

5、Log显示：

2016-4-17 20:42:47 org.hibernate.annotations.common.Version <clinit>

INFO: HCANN000001: Hibernate Commons Annotations {4.0.2.Final}

2016-4-17 20:42:47 org.hibernate.Version logVersion

INFO: HHH000412: Hibernate Core {4.2.21.Final}

2016-4-17 20:42:47 org.hibernate.cfg.Environment <clinit>

INFO: HHH000206: hibernate.properties not found

2016-4-17 20:42:47 org.hibernate.cfg.Environment buildBytecodeProvider

INFO: HHH000021: Bytecode provider name : javassist

2016-4-17 20:42:47 org.hibernate.cfg.Configuration configure

INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml

2016-4-17 20:42:47 org.hibernate.cfg.Configuration getConfigurationInputStream

INFO: HHH000040: Configuration resource: /hibernate.cfg.xml

2016-4-17 20:42:47 org.hibernate.cfg.Configuration doConfigure

INFO: HHH000041: Configured SessionFactory: null

2016-4-17 20:42:47 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)

2016-4-17 20:42:47 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000115: Hibernate connection pool size: 20

2016-4-17 20:42:47 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000006: Autocommit mode: false

2016-4-17 20:42:47 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/hibernate?useUnicode=true&characterEncoding=UTF-8]

2016-4-17 20:42:47 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000046: Connection properties: {user=root, password=****}

2016-4-17 20:42:48 org.hibernate.dialect.Dialect <init>

INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect

2016-4-17 20:42:48 org.hibernate.engine.jdbc.internal.LobCreatorBuilder useContextualLobCreation

INFO: HHH000423: Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4

2016-4-17 20:42:48 org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService

INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)

2016-4-17 20:42:48 org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>

INFO: HHH000397: Using ASTQueryTranslatorFactory

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000228: Running hbm2ddl schema update

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000102: Fetching database metadata

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000396: Updating schema

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.DatabaseMetadata getTableMetadata

INFO: HHH000262: Table not found: IdCard

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.DatabaseMetadata getTableMetadata

INFO: HHH000262: Table not found: Students

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.DatabaseMetadata getTableMetadata

INFO: HHH000262: Table not found: IdCard

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.DatabaseMetadata getTableMetadata

INFO: HHH000262: Table not found: Students

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.DatabaseMetadata getTableMetadata

INFO: HHH000262: Table not found: IdCard

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.DatabaseMetadata getTableMetadata

INFO: HHH000262: Table not found: Students

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000232: Schema update complete

2016-4-17 20:42:49 org.hibernate.dialect.Dialect <init>

INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.SchemaExport execute

INFO: HHH000227: Running hbm2ddl schema export

2016-4-17 20:42:49 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)

2016-4-17 20:42:49 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000115: Hibernate connection pool size: 20

2016-4-17 20:42:49 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000006: Autocommit mode: false

2016-4-17 20:42:49 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/hibernate?useUnicode=true&characterEncoding=UTF-8]

2016-4-17 20:42:49 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000046: Connection properties: {user=root, password=****}

    alter table Students

        drop

        foreign key FK_mryi31xkbwbosevquurf60ivb

    drop table if exists IdCard

    drop table if exists Students

    create table IdCard (

        pid varchar(18) not null,

        sname varchar(255),

        primary key (pid)

    )

    create table Students (

        sid integer not null auto_increment,

        birthday datetime,

        gender varchar(255),

        major varchar(255),

        pid varchar(18),

        primary key (sid)

    )

    alter table Students

        add constraint UK_mryi31xkbwbosevquurf60ivb unique (pid)

    alter table Students

        add index FK_mryi31xkbwbosevquurf60ivb (pid),

        add constraint FK_mryi31xkbwbosevquurf60ivb

        foreign key (pid)

        references IdCard (pid)

2016-4-17 20:42:49 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop

INFO: HHH000030: Cleaning up connection pool [jdbc:mysql://localhost:3306/hibernate?useUnicode=true&characterEncoding=UTF-8]

2016-4-17 20:42:49 org.hibernate.tool.hbm2ddl.SchemaExport execute

INFO: HHH000230: Schema export complete

6、添加学生记录测试：

@Test

    public void addStudents()

    {

        //创建Hibernate配置对象

        Configuration configuration = new Configuration().configure();

        //创建服务注册对象

        ServiceRegistry serviceRegistry =

                new ServiceRegistryBuilder()

        .applySettings(configuration.getProperties())

        .buildServiceRegistry();

        //创建sessionFactory

        SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);

        //创建会话对象

        Session session = sessionFactory.getCurrentSession();

        //开启事务

        Transaction tx = session.beginTransaction();

        //生成一个学生身份证对象

        IdCard card = new IdCard("888888888888888888","刘德华");

        //生成一个学生对象

        Students stu = new Students(card,"男",new Date(),"计算机");

        //先保存被控表对象(身份证)

        session.save(card);

        session.save(stu);

        //提交事务

        tx.commit();

    }

7、添加学生Log：

2016-4-17 20:49:51 org.hibernate.annotations.common.Version <clinit>

INFO: HCANN000001: Hibernate Commons Annotations {4.0.2.Final}

2016-4-17 20:49:52 org.hibernate.Version logVersion

INFO: HHH000412: Hibernate Core {4.2.21.Final}

2016-4-17 20:49:52 org.hibernate.cfg.Environment <clinit>

INFO: HHH000206: hibernate.properties not found

2016-4-17 20:49:52 org.hibernate.cfg.Environment buildBytecodeProvider

INFO: HHH000021: Bytecode provider name : javassist

2016-4-17 20:49:52 org.hibernate.cfg.Configuration configure

INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml

2016-4-17 20:49:52 org.hibernate.cfg.Configuration getConfigurationInputStream

INFO: HHH000040: Configuration resource: /hibernate.cfg.xml

2016-4-17 20:49:52 org.hibernate.cfg.Configuration doConfigure

INFO: HHH000041: Configured SessionFactory: null

2016-4-17 20:49:52 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)

2016-4-17 20:49:52 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000115: Hibernate connection pool size: 20

2016-4-17 20:49:52 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000006: Autocommit mode: false

2016-4-17 20:49:52 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/hibernate?useUnicode=true&characterEncoding=UTF-8]

2016-4-17 20:49:52 org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure

INFO: HHH000046: Connection properties: {user=root, password=****}

2016-4-17 20:49:52 org.hibernate.dialect.Dialect <init>

INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect

2016-4-17 20:49:52 org.hibernate.engine.jdbc.internal.LobCreatorBuilder useContextualLobCreation

INFO: HHH000423: Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4

2016-4-17 20:49:53 org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService

INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)

2016-4-17 20:49:53 org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>

INFO: HHH000397: Using ASTQueryTranslatorFactory

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000228: Running hbm2ddl schema update

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000102: Fetching database metadata

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000396: Updating schema

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.TableMetadata <init>

INFO: HHH000261: Table found: hibernate.idcard

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.TableMetadata <init>

INFO: HHH000037: Columns: [pid, sname]

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.TableMetadata <init>

INFO: HHH000108: Foreign keys: []

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.TableMetadata <init>

INFO: HHH000126: Indexes: [primary]

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.TableMetadata <init>

INFO: HHH000261: Table found: hibernate.students

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.TableMetadata <init>

INFO: HHH000037: Columns: [birthday, sid, gender, pid, major]

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.TableMetadata <init>

INFO: HHH000108: Foreign keys: [fk_mryi31xkbwbosevquurf60ivb]

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.TableMetadata <init>

INFO: HHH000126: Indexes: [primary, fk_mryi31xkbwbosevquurf60ivb, uk_mryi31xkbwbosevquurf60ivb]

2016-4-17 20:49:53 org.hibernate.tool.hbm2ddl.SchemaUpdate execute

INFO: HHH000232: Schema update complete

Hibernate:

    insert

    into

        IdCard

        (sname, pid)

    values

        (?, ?)

Hibernate:

    insert

    into

        Students

        (birthday, pid, gender, major)

    values

        (?, ?, ?, ?)

　　

hibernate一对一双向外键关联的更多相关文章

  1. Java进阶知识07 Hibernate一对一双向外键关联（Annotation+XML实现）

    1.Annotation 注解版 1.1.创建Husband类和Wife类 package com.shore.model; import javax.persistence.Entity; impo ...

  2. HIBERNATE一对一双向外键联合主键关联

    HIBERNATE一对一双向外键联合主键关联: 一. 创建主键类:这个主键必须实现serializedable接口和重写其中的hashCode方法和equals方法:为主键类添加一个叫做@Embedd ...

  3. 04-hibernate注解-一对一双向外键关联

    一对一双向外键 1,主控方的配置同一对一单向外键关联. 2,@OneToOne(mappedBy="card") //被控方 @OneToOne(mappedBy="ca ...

  4. Hibernate一对一单向外键关联

    一.一对一单向外键关联: 一对一单向外键关联主要用到了以下两个注解: 1.OneToOne(cascade=CasecadeTYPE.ALL); cascade=CasecadeTYPE.ALL:表示 ...

  5. Hibernate 再接触 关系映射 一对一双向外键关联

    凡是双向关联必设mapped by  由对方主导 wifi.java package com.bjsxt.hibernate; import javax.persistence.Entity; imp ...

  6. Java进阶知识06 Hibernate一对一单向外键关联（Annotation+XML实现）

    1.Annotation 注解版 1.1.创建Husband类和Wife类 package com.shore.model; import javax.persistence.Entity; impo ...

  7. Hibernate关系映射 一对一双向外键关联@OneToOne Annotation方式 双向关联和单向关联的区别

    首先还是来构造一个实际应用的场景,比如实体类车辆(Car),它具有以下属性:Id,品牌(brand),车牌(lisencePlate):实体类车牌(LisencePlate),它具有以下属性:Id,号 ...

  8. Hibernate关系映射 一对一双向外键关联@OneToOne Annotation方式

    首先还是来构造一个实际应用的场景,比如实体类车辆(Car),它具有以下属性:Id,品牌(brand),车牌(lisencePlate):实体类车牌(LisencePlate),它具有以下属性:Id,号 ...

  9. 012一对一 唯一外键关联映射_双向(one-to-one)

    ²  两个对象之间是一对一的关系,如Person-IdCard(人—身份证号) ²  有两种策略可以实现一对一的关联映射 主键关联:即让两个对象具有相同的主键值,以表明它们之间的一一对应的关系:数据库 ...

随机推荐

  1. Git CMD - clone: Clone a repository into a new directory

    命令格式 git clone [--template=<template_directory>]  [-l] [-s] [--no-hardlinks] [-q] [-n] [--bare ...

  2. SNMP监控一些常用OID的总结

    做网络监控的人对SNMP的协议肯定够很熟悉,下面罗列出一些常见的OID说明,方便大家省去查阅相关资料的麻烦. 系统参数(1.3.6.1.2.1.1) OID 描述 备注 请求方式 .1.3.6.1.2 ...

  3. C#算法基础之插入排序

    using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.T ...

  4. HDOJ2019数列有序!

    数列有序! Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submi ...

  5. MySQL之经典语句

    数据库的创建:(例如创建名为ConstructionDB的数据库) --创建SelfStudy数据库 CREATE DATABASE ConstructionDB ON PRIMARY --创建主数据 ...

  6. 使用Win7+IIS7发布网站或服务步骤

    1.安装IIS服务:控制面板=>程序=>打开或关闭WINDOWS 功能=>Internet 信息服务=>WEB服务管理器全选√ 和万维网服务:应用程序开发功能: 2.打开IIS ...

  7. 企业SAAS的春天，将以手机应用的形式，即将到来

    派尔科技吴春福 *本文是派尔为什么要投身企业移动应用的内部分享文章: *我没有仔细核查资料,仅代表个人看法,思路也是在整理过程,逻辑未必很完整,看官将就着看. 企业SAAS,概念起源是N年前,先行者也 ...

  8. krpano资料

  9. 类的构造器[constructor]_C#

    类的构造器(constructor): 1.       先看两个类定义: class A{ } 相当于: class A: object { Public A ( ) : base( ) {   } ...

  10. 高性能CSS（三）

    CSS选择器对性能的影响源于浏览器匹配选择器和文档元素时所消耗的时间,所以优化选择器的原则是应尽量避免需要消耗更多匹配时间的选择器.而在这之前我们需要了解CSS选择器匹配的机制,如例子的子选择器规则: ...