hibernate的表结构以及表之间的关系的　*.hbm.xml

假设有一个实体类，用于存放用户信息，其定义如下：

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package events;

import java.util.*;

public class Person {

    private Long id;
    private int age;
    private String firstname;
    private String lastname;

    public Person() {}

    public Long getId() {
        return id;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getFirstname() {
        return firstname;
    }

    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }

    public String getLastname() {
        return lastname;
    }

    public void setLastname(String lastname) {
        this.lastname = lastname;
    }

    private Set emailAddresses = new HashSet();

    public Set getEmailAddresses() {
        return emailAddresses;
    }

    public void setEmailAddresses(Set emailAddresses) {
        this.emailAddresses = emailAddresses;
    }

    private Set events = new HashSet();

    // Defensive, convenience methods
    protected Set getEvents() {
        return events;
    }

    protected void setEvents(Set events) {
        this.events = events;
    }

    public void addToEvent(Event event) {
        this.getEvents().add(event);
        event.getParticipants().add(this);
    }

    public void removeFromEvent(Event event) {
        this.getEvents().remove(event);
        event.getParticipants().remove(this);
    }

}

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则相应的描述POJO--->Person.hbm.xml中的配置信息如下：

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<?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="events.Person" table="PERSON">
        <id name="id" column="PERSON_ID">
            <generator class="identity" />
        </id>
        <property name="age" />
        <property name="firstname" />
        <property name="lastname" />
        <set name="events" table="PERSON_EVENT">
            <key column="PERSON_ID" />
            <many-to-many column="EVENT_ID" class="events.Event" />
        </set>
        <set name="emailAddresses" table="PERSON_EMAIL_ADDR">
            <key column="PERSON_ID" />
            <element type="string" column="EMAIL_ADDR" />
        </set>
    </class>
</hibernate-mapping>

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说明：

１．class 节点

name: 类名 table: 类对应表名，默认为类名称 dynamic-update: 生成更新字段时，只包含发生变动的字段，默认为false。 dynamic-insert:　生成insert语句时仅包含非null字段 Proxy: 代理类，默认为空 discriminator-value: 子类辨别标识用于多态支持 where:　通过限定条件查询结果集。如：查询有籍在校学生的信息可以使用"where studentstatus='0'"

Event.hbm.xml

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<?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="events.Event" table="EVENTS">
  <id name="id" column="EVENT_ID">
   <generator class="native" />
  </id>
  <property name="date" type="timestamp" column="EVENT_DATE" />
  <property name="title" />
  <set name="participants" table="PERSON_EVENT" inverse="true">
   <key column="EVENT_ID" />
   <many-to-many column="PERSON_ID" class="events.Person" />
  </set>
 </class>
</hibernate-mapping>

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