Hibernate教程07_关系映射之一对一双向主键关联

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本节源码：http://download.csdn.net/detail/e421083458/5253718

一对一双向主键关联（不重要）(使用Annotation无外键关联，使用xml后发现两表使用相同主键)

实现方式有两种：

Annotation方式：
@primaryKeyJoinColumn
注：此方式有些小Bug，系统不会自动向表里写入外键关联！

XML方式：
<one-to-one id 使用foreign class和<one-to-one property-ref

项目源码：

Husband.java

package com.bjsxt.hibernate;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.OneToOne;import javax.persistence.PrimaryKeyJoinColumn;@Entitypublic class Husband {    private int id;    private String name;    private Wife wife;    @Id    @GeneratedValue    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;    }    @OneToOne    @PrimaryKeyJoinColumn    public Wife getWife() {        return wife;    }    public void setWife(Wife wife) {        this.wife = wife;    }}

Student.java

package com.bjsxt.hibernate;public class Student {    private int id;    private String name;        private int age;    private String sex;    private boolean good;    private StuIdCard idcard;    public StuIdCard getIdcard() {        return idcard;    }    public void setIdcard(StuIdCard idcard) {        this.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 int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    public String getSex() {        return sex;    }    public void setSex(String sex) {        this.sex = sex;    }    public boolean isGood() {        return good;    }    public void setGood(boolean good) {        this.good = good;    }    }

StuIdCard.java

package com.bjsxt.hibernate;public class StuIdCard {    private int id;    private String num;    private Student student;        public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getNum() {        return num;    }    public void setNum(String num) {        this.num = num;    }    public Student getStudent() {        return student;    }    public void setStudent(Student student) {        this.student = student;    }}

Wife.java

package com.bjsxt.hibernate;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.OneToOne;import javax.persistence.PrimaryKeyJoinColumn;@Entitypublic class Wife {    private int id;    private String name;    private Husband husband;        @OneToOne    @PrimaryKeyJoinColumn    public Husband getHusband() {        return husband;    }    public void setHusband(Husband husband) {        this.husband = husband;    }    @Id    @GeneratedValue    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;    }}

Student.hbm.xml

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping>    <class name="com.bjsxt.hibernate.Student" table="C_student" dynamic-update="true">        <id name="id">            <generator class="native"></generator>        </id>                <property name="name"></property>        <property name="age" />        <property name="sex" />        <property name="good" type="yes_no"></property>        <one-to-one name="idcard"  constrained="true"></one-to-one>    </class>    </hibernate-mapping>

StuIdCard.hbm.xml

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping>    <class name="com.bjsxt.hibernate.StuIdCard">        <id name="id">            <generator class="native"></generator>        </id>                <property name="num"/>        <one-to-one name="student"  constrained="true"></one-to-one>    </class>    </hibernate-mapping>

测试脚本：

package com.bjsxt.hiberante;import java.util.Date;import org.hibernate.Query;import org.hibernate.SessionFactory;import org.hibernate.cfg.AnnotationConfiguration;import org.hibernate.tool.hbm2ddl.SchemaExport;import org.hibernate.Session;import org.junit.AfterClass;import org.junit.BeforeClass;import org.junit.Test;import com.bjsxt.hibernate.Husband;import com.bjsxt.hibernate.StuIdCard;import com.bjsxt.hibernate.Student;import com.bjsxt.hibernate.Wife;public class HibernateQLTest {    private static SessionFactory sf;    @BeforeClass    public static void setUpBeforeClass() throws Exception {        System.out.println("BeforeClass");        sf = new AnnotationConfiguration().configure().buildSessionFactory();    }    @AfterClass    public static void tearDownAfterClass() throws Exception {        System.out.println("AfterClass");        sf.close();    }    //    @Test    public void testSchemaExport(){        new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);            }    @Test    public void testOneTOOne_Wife(){        Session session = sf.getCurrentSession();        session.beginTransaction();        Wife wife = new Wife();        wife.setName("wife");        Husband husband = new Husband();        husband.setName("husband");        husband.setWife(wife);        session.save(wife);                            //先保存妻子        session.save(husband);                        //再保存丈夫        session.getTransaction().commit();    }    @Test    public void testOneToOne_Stu(){        Session session = sf.getCurrentSession();        session.beginTransaction();        Student stu = new Student();        stu.setName("student");        stu.setAge(20);        stu.setGood(false);        stu.setSex("man");        StuIdCard idcard = new StuIdCard();        idcard.setStudent(stu);        idcard.setNum("什马卡？");        session.save(stu);        session.save(idcard);        session.getTransaction().commit();            }    public static void main(String args[]){        sf = new AnnotationConfiguration().configure().buildSessionFactory();                Session session = sf.getCurrentSession();        session.beginTransaction();        Student stu = new Student();        stu.setName("student");        stu.setAge(20);        stu.setGood(false);        stu.setSex("man");        StuIdCard idcard = new StuIdCard();        idcard.setStudent(stu);        idcard.setNum("什马卡？");        session.save(stu);        session.save(idcard);        session.getTransaction().commit();                sf.close();            }}