hibernate一对一映射

package loaderman.c_one2one;

// 身份证
public class IdCard {

    // 身份证号(主键)
    private String cardNum;// 对象唯一表示(Object Identified, OID)
    private String place; //  身份证地址
    // 身份证与用户，一对一的关系
    private User user;


    public String getCardNum() {
        return cardNum;
    }
    public void setCardNum(String cardNum) {
        this.cardNum = cardNum;
    }
    public String getPlace() {
        return place;
    }
    public void setPlace(String place) {
        this.place = place;
    }
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }


}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="loaderman.c_one2one">
    
    <class name="IdCard" table="t_IdCard">
        <id name="cardNum">
            <generator class="assigned"></generator>
        </id>    
        <property name="place" length="20"></property>
        
        <!-- 
            一对一映射，有外键方
            unique="true"   给外键字段添加唯一约束
         -->
         <many-to-one name="user" unique="true" column="user_id" class="User" cascade="save-update"></many-to-one>
            
    </class>
    

</hibernate-mapping>

package loaderman.c_one2one;

// 用户
public class User {

    private int userId;
    private String userName;
    // 用户与身份证信息， 一对一关系
    private IdCard idCard;


    public IdCard getIdCard() {
        return idCard;
    }
    public void setIdCard(IdCard idCard) {
        this.idCard = idCard;
    }
    public int getUserId() {
        return userId;
    }
    public void setUserId(int userId) {
        this.userId = userId;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }


}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="loaderman.c_one2one">
    
    <class name="User" table="t_user">
        <id name="userId">
            <generator class="native"></generator>
        </id>    
        <property name="userName" length="20"></property>
        <!-- 
            一对一映射： 没有外键方
         -->
         <one-to-one name="idCard" class="IdCard"></one-to-one>
             
    </class>
    

</hibernate-mapping>

package loaderman.c_one2one;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;
import org.junit.Test;

public class App {

    private static SessionFactory sf;
    static {
        sf = new Configuration()
                .configure()
                .addClass(IdCard.class)
                .addClass(User.class)   // 测试时候使用
                .buildSessionFactory();
    }

    @Test
    public void getSave() {

        Session session = sf.openSession();
        session.beginTransaction();

        // 用户
        User user = new User();
        user.setUserName("Jack");
        // 身份证
        IdCard idCard = new IdCard();
        idCard.setCardNum("441202XXX");
        idCard.setPlace("广州XXX");
        // 关系
        idCard.setUser(user);

        // ----保存----
        session.save(idCard);

        session.getTransaction().commit();
        session.close();

    }

}

---

---

package loaderman.c_one2one2;


import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;
import org.junit.Test;

public class App {

    private static SessionFactory sf;
    static {
        sf = new Configuration()
                .configure()
                .addClass(IdCard.class)
                .addClass(User.class)   // 测试时候使用
                .buildSessionFactory();
    }

    @Test
    public void getSave() {

        Session session = sf.openSession();
        session.beginTransaction();

        // 用户
        User user = new User();
        user.setUserName("Jack");
        // 身份证
        IdCard idCard = new IdCard();
        idCard.setCardNum("441202XXX");
        idCard.setPlace("广州XXX");
        // 关系
        idCard.setUser(user);

        // ----保存----
        session.save(idCard);

        session.getTransaction().commit();
        session.close();

    }

}

package loaderman.c_one2one2;

// 身份证
public class IdCard {

    private int user_id;
    // 身份证号
    private String cardNum;
    private String place; //  身份证地址
    // 身份证与用户，一对一的关系
    private User user;



    public int getUser_id() {
        return user_id;
    }
    public void setUser_id(int userId) {
        user_id = userId;
    }
    public String getCardNum() {
        return cardNum;
    }
    public void setCardNum(String cardNum) {
        this.cardNum = cardNum;
    }
    public String getPlace() {
        return place;
    }
    public void setPlace(String place) {
        this.place = place;
    }
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }


}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="loaderman.c_one2one2">
    
    <class name="IdCard" table="t_IdCard">
        <id name="user_id">
            <!-- 
                id 节点指定的是主键映射, 即user_id是主键
                主键生成方式： foreign  即把别的表的主键作为当前表的主键；
                        property (关键字不能修改)指定引用的对象     对象的全名 cn..User、  对象映射 cn.User.hbm.xml、   table(id)
             -->
            <generator class="foreign">
                <param name="property">user</param>
            </generator>
        </id>    
        <property name="cardNum" length="20"></property>
        <property name="place" length="20"></property>
        
        <!-- 
            一对一映射，有外键方
            （基于主键的映射）
             constrained="true"  指定在主键上添加外键约束
         -->
        <one-to-one name="user" class="User" constrained="true"  cascade="save-update"></one-to-one>
            
    </class>
    

</hibernate-mapping>

package loaderman.c_one2one2;
// 用户
public class User {

    private int userId;
    private String userName;
    // 用户与身份证信息， 一对一关系
    private IdCard idCard;


    public IdCard getIdCard() {
        return idCard;
    }
    public void setIdCard(IdCard idCard) {
        this.idCard = idCard;
    }
    public int getUserId() {
        return userId;
    }
    public void setUserId(int userId) {
        this.userId = userId;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }


}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="loaderman.c_one2one2">
    
    <class name="User" table="t_user">
        <id name="userId">
            <generator class="native"></generator>
        </id>    
        <property name="userName" length="20"></property>
        <!-- 
            一对一映射： 没有外键方
         -->
         <one-to-one name="idCard" class="IdCard"></one-to-one>
             
    </class>
    

</hibernate-mapping>