one2one外键关联

1.两个实体类一个personanno一个phonenumber都设置为@Entity并且都有自己的@Id
2.在personanno类里新增一个属性phonenumber并且有getset方法
3.在personanno类的getPhoneNumber方法上注解@OneToOne
4.在hibernate.cfg.xml配置两个实体类映射关系
<mapping name="code">package com.meiyoudao.domain;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.OneToOne;@Entitypublic class PersonAnno { private int id; private String name; private String weight; private PhoneNumber phoneNumber; @OneToOne public PhoneNumber getPhoneNumber() { return phoneNumber; } public void setPhoneNumber(PhoneNumber phoneNumber) { this.phoneNumber = phoneNumber; } @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; } public String getWeight() { return weight; } public void setWeight(String weight) { this.weight = weight; }}

package com.meiyoudao.domain;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;/** * @author User * */@Entitypublic class PhoneNumber {private int id;@Id@GeneratedValuepublic int getId() {return id;}public void setId(int id) {this.id = id;}private String number;private String telphone;public String getNumber() {return number;}public void setNumber(String number) {this.number = number;}public String getTelphone() {return telphone;}public void setTelphone(String telphone) {this.telphone = telphone;}}

<!--hibernate.cfg.xml 配置--><mapping name="code">package com.meiyoudao.domain;/** * @author meiyoudao * */public class Person {private int id;private String name;private String weight;private PhoneNumber phoneNumber;public PhoneNumber getPhoneNumber() {return phoneNumber;}public void setPhoneNumber(PhoneNumber phoneNumber) {this.phoneNumber = phoneNumber;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getWeight() {return weight;}public void setWeight(String weight) {this.weight = weight;}public int getId() {return id;}public void setId(int id) {this.id = id;}}

package com.meiyoudao.domain;/** * @author meiyoudao * */public class PhoneNumber {private int id;public int getId() {return id;}public void setId(int id) {this.id = id;}private String number;private String telphone;public String getNumber() {return number;}public void setNumber(String number) {this.number = number;}public String getTelphone() {return telphone;}public void setTelphone(String telphone) {this.telphone = telphone;}}

<?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 package="com.meiyoudao.domain">    <class name="PhoneNumber">        <id name="id"></id>        <property name="number"/>        <property name="telphone"/>    </class></hibernate-mapping>

<?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 package="com.meiyoudao.domain">    <class name="Person">        <id name="id">        </id>        <property name="name"/>        <property name="weight"/>        <!-- one2one 在XML中配置也是用many-to-one -->        <!--只要unique="true"为true就可以了.唯一属性为true-->        <many-to-one name="phoneNumber" unique="true"></many-to-one>    </class></hibernate-mapping>

<!--hibernate.cfg.xml中的映射配置-->        <mapping resource="com/meiyoudao/domain/Person.hbm.xml"/>        <mapping resource="com/meiyoudao/domain/PhoneNumber.hbm.xml"/>

需要注意的测试方法
hibernate中是先把两个对象都insert进表中,然后再进行一次update使这两条记录关联起来.

@Testpublic void saveUnit(){session.beginTransaction();Person person = new Person();PhoneNumber pn = new PhoneNumber();pn.setNumber("1234567890");pn.setTelphone("IPHONE");person.setPhoneNumber(pn);person.setName("daodao1");person.setId(3);//两个对象都要savesession.save(person);session.save(pn);}