映射组件属性之④：组件作为Map的索引

hibernate.cfg.xml :

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE hibernate-configuration PUBLIC          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><!-- Generated by MyEclipse Hibernate Tools.                   --><hibernate-configuration>    <session-factory>        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>        <property name="connection.url">jdbc:mysql://localhost:3306/temp</property>        <property name="connection.username">root</property>        <property name="connection.password">mysqladmin</property>        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>        <property name="hbm2ddl.auto">update</property>        <property name="show_sql">true</property>        <property name="format_sql">true</property>        <mapping resource="db/mapping/Person.hbm.xml"/>    </session-factory></hibernate-configuration>

Person.java :

public class Person {private int id;private int age;private Map<Name,Integer> nickPower=new HashMap<Name,Integer>();public int getId() {return id;}public void setId(int id) {this.id = id;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public Map<Name, Integer> getNickPower() {return nickPower;}public void setNickPower(Map<Name, Integer> nickPower) {this.nickPower = nickPower;}}

Name.java :

public class Name {private String firstname;private String lastname;private Person owner;public Name() {}public Name(String firstname, String lastname) {this.firstname = firstname;this.lastname = lastname;}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;}public Person getOwner() {return owner;}public void setOwner(Person owner) {this.owner = owner;}@Overridepublic boolean equals(Object obj) {if(this==obj){return true;}if(obj!=null && obj.getClass()==Name.class){Name target=(Name)obj;if(target.getFirstname()==this.getFirstname() && target.getLastname()==this.getLastname()){return true;}}return false;}@Overridepublic int hashCode() {return getFirstname().hashCode()*13+getLastname().hashCode();}}

Person.hbm.xml :

<?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="db.domain">    <class name="Person" table="persons">            <id name="id">            <generator class="identity"></generator>        </id>                <property name="age" type="integer"/>                <map name="nickPower" table="nickPower">            <key column="person_id" not-null="true"/>            <composite-map-key class="Name">                <key-property name="firstname" type="string"/>                <key-property name="lastname" type="string"/>            </composite-map-key>            <element column="nick_power" type="integer"/>        </map>            </class></hibernate-mapping>

Test.java :

public class Test {public static void main(String[] args) {Session session=HibernateSessionFactory.getSession();Transaction txt=session.beginTransaction();Person p1=new Person();p1.setAge(10);Map<Name,Integer> nickPower1=new HashMap<Name,Integer>();nickPower1.put(new Name("张","三"),50);p1.setNickPower(nickPower1);Person p2=new Person();p2.setAge(20);Map<Name,Integer> nickPower2=new HashMap<Name,Integer>();nickPower2.put(new Name("张","伟"),80);p2.setNickPower(nickPower2);session.save(p1);session.save(p2);txt.commit();HibernateSessionFactory.closeSession();}}