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 class="com.meiyoudao.domain.PersonAnno"/>
<mapping class="com.meiyoudao.domain.PhoneNumber"/>
5.常用的hibernate创建语句方法
new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);
第一个参数,表示是否在数据库中执行.第二个参数,是否在控制台中打印.

package com.meiyoudao.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToOne;

@Entity
public 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
 *
 */
@Entity
public class PhoneNumber {

	private int id;
	@Id
	@GeneratedValue
	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;
	}
}

<!--hibernate.cfg.xml 配置-->

<mapping class="com.meiyoudao.domain.PersonAnno"/>
        <mapping class="com.meiyoudao.domain.PhoneNumber"/>

XML 版本  one2one外键关联

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.

	@Test
	public 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save
		session.save(person);
		session.save(pn);
	}