关于hibernate的一对多映射
两个类：People和City
package com.pk.po;
import java.util.Set;
public class City {
privateintid;
privateStringname;
privateSetcityes;
publicSetgetCityes(){
returncityes;
}
publicvoidsetCityes(Setcityes){
this.cityes=cityes;
}
publicintgetId(){
returnid;
}
publicvoidsetId(intid){
this.id=id;
}
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
}package com.pk.po;
public class People {
privateintid;
private String name;public int getId() {
returnid;
}
publicvoidsetId(intid){
this.id=id;
}
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}}
映射文件（ORM）：
City.hbm.xml
<?xml version="1.0"?>
<!DOCTYPEhibernate-mappingPUBLIC
"-//Hibernate/HibernateMappingDTD3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mappingpackage="com.pk.po">
<classname="City">
<idname="id">
<generatorclass="native"></generator>
</id>
<property name="name"></property><!--
cascade="all" 表示两表相关联
-->
<setname="cityes"cascade="all">
<keycolumn="cityid"></key>
<one-to-manyclass="People"/>
</set>
</class>
</hibernate-mapping>People.hbm.xml
<?xmlversion="1.0"?>
<!DOCTYPEhibernate-mappingPUBLIC
"-//Hibernate/HibernateMappingDTD3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mappingpackage="com.pk.po">
<classname="People">
<idname="id">
<generatorclass="native"></generator>
</id>
<propertyname="name"></property>
</class>
</hibernate-mapping>配置文件
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/HibernateConfigurationDTD3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration>
<session-factory>
<propertyname="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<propertyname="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate_hql</property>
<propertyname="hibernate.connection.username">root</property>
<propertyname="hibernate.connection.password">root</property>
<propertyname="show_sql">true</property>
<propertyname="dialect">org.hibernate.dialect.MySQLDialect</property>
<mappingresource="com/pk/po/City.hbm.xml"/>
<mappingresource="com/pk/po/People.hbm.xml"/>
</session-factory>
</hibernate-configuration>