hibernate 一对一 one to one的两种配置方式

hibernate中one-to-one两种配置方式

标签： hibernateHibernateone-to-one

2013-02-19 17:44 11445人阅读 评论(1) 收藏 举报

 分类：

hibernate（2） 

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public class Person {
    private int id;
    private String name;
    private IdCard idCard;

    public Person() {
    }

    public Person(int id, String name, IdCard idCard) {
        this.id = id;
        this.name = name;
        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 IdCard getIdCard() {
        return idCard;
    }

    public void setIdCard(IdCard idCard) {
        this.idCard = idCard;
    }

}

public class IdCard {
    private int id;
    private Date usefullLife;
    private Person person;

    public IdCard() {
    }

    public IdCard(int id, Date usefullLife, Person person) {
        this.id = id;
        this.usefullLife = usefullLife;
        this.person = person;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public Date getUsefullLife() {
        return usefullLife;
    }

    public void setUsefullLife(Date usefullLife) {
        this.usefullLife = usefullLife;
    }

    public Person getPerson() {
        return person;
    }

    public void setPerson(Person person) {
        this.person = person;
    }

}

one-to-one方式一：

IdCard.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
    <!--
        Mapping file autogenerated by MyEclipse Persistence Tools
    -->
<hibernate-mapping>

    <class name="com.huawei.domain.IdCard" table="id_card">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="foreign" >
                <param name="property">person</param>
            </generator>
        </id>

        <property name="usefullLife" type="java.util.Date">
            <column name="usefull_life"/>
        </property>

        <one-to-one name="person" constrained="true"></one-to-one>
    </class>
</hibernate-mapping>

Person.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
    <!--
        Mapping file autogenerated by MyEclipse Persistence Tools
    -->
<hibernate-mapping>

    <class name="com.huawei.domain.Person">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="native" />
        </id>

        <property name="name" type="java.lang.String">
            <column name="name" length="5" not-null="false" />
        </property>

        <one-to-one name="idCard"></one-to-one>
    </class>
</hibernate-mapping>

one-to-one方式二：

IdCard.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
    <!--
        Mapping file autogenerated by MyEclipse Persistence Tools
    -->
<hibernate-mapping>

    <class name="com.huawei.domain.IdCard" table="id_card">
        <id name="id" type="java.lang.Integer">
        <!--
            <column name="id" />
            <generator class="foreign" >
                <param name="property">person</param>
            </generator>
         -->
         <column name="id" />
         <generator class="native" />
        </id>

        <property name="usefullLife" type="java.util.Date">
            <column name="usefull_life"/>
        </property>

<!--         <one-to-one name="person" constrained="true"></one-to-one> -->
        <many-to-one name="person" column="person_id" unique="true"></many-to-one>
    </class>
</hibernate-mapping>

Person.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
    <!--
        Mapping file autogenerated by MyEclipse Persistence Tools
    -->
<hibernate-mapping>

    <class name="com.huawei.domain.Person">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="native" />
        </id>

        <property name="name" type="java.lang.String">
            <column name="name" length="5" not-null="false" />
        </property>

        <one-to-one name="idCard" property-ref="person"></one-to-one>
    </class>
</hibernate-mapping>

测试：

        Session s = null;
        try{
            s = HibernateSessionFactory.getSession();
//          Person person = (Person)s.get(Person.class, id);
//          System.out.println(person.getIdCard().getUsefullLife());

            IdCard idCard = (IdCard)s.get(IdCard.class, id);
            System.out.println(idCard.getPerson().getName());

        } catch (HibernateException e) {
            e.printStackTrace();
        }