关于hibernat中<hibernate-mapping>如何关联两个类

请问下在hibernate中两个类是如何关联的呢？例如： <?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”> <hibernate-mapping> <class name=”com.suxiaolei.hibernate.pojos.Customer” table=”customer”> <!– 主键设置 –> <id name=”id” type=”string”> <column name=”id”></column> <generator class=”uuid”></generator> </id> <!– 属性设置 –> <property name=”username” column=”username” type=”string”></property> <property name=”balance” column=”balance” type=”integer”></property> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> </class> </hibernate-mapping> <?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”> <hibernate-mapping> <class name=”com.suxiaolei.hibernate.pojos.Order” table=”orders”> <id name=”id” type=”string”> <column name=”id”></column> <generator class=”uuid”></generator> </id> <property name=”orderNumber” column=”orderNumber” type=”string”></property> <property name=”cost” column=”cost” type=”integer”></property> <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> </class> </hibernate-mapping> 上面的代码是我在网页中copy的一个例子，第一个顾客，第二个是订单，一对多关系，在其中<set>标签中的name属性是代表什么？<key>中column的值又是怎么设置的？还有就是这个两个类（customer、order）类又是如何建立关联的呢？谢谢哈！
20分	<many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段
	那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？
	引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？
	引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？这个是表的字段名也就是id主键
	引用 4 楼 sizhouzhou 的回复: Quote: 引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？这个是表的字段名也就是id主键那也就是说主键的字段名是：表名_<id>中定义的列名，是么？就像上面的表名是：customer，id元素中定义的列名为：id，最后得出主键名为：customer_id?

请问下在hibernate中两个类是如何关联的呢？例如： <?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”> <hibernate-mapping> <class name=”com.suxiaolei.hibernate.pojos.Customer” table=”customer”> <!– 主键设置 –> <id name=”id” type=”string”> <column name=”id”></column> <generator class=”uuid”></generator> </id> <!– 属性设置 –> <property name=”username” column=”username” type=”string”></property> <property name=”balance” column=”balance” type=”integer”></property> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> </class> </hibernate-mapping> <?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”> <hibernate-mapping> <class name=”com.suxiaolei.hibernate.pojos.Order” table=”orders”> <id name=”id” type=”string”> <column name=”id”></column> <generator class=”uuid”></generator> </id> <property name=”orderNumber” column=”orderNumber” type=”string”></property> <property name=”cost” column=”cost” type=”integer”></property> <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> </class> </hibernate-mapping> 上面的代码是我在网页中copy的一个例子，第一个顾客，第二个是订单，一对多关系，在其中<set>标签中的name属性是代表什么？<key>中column的值又是怎么设置的？还有就是这个两个类（customer、order）类又是如何建立关联的呢？谢谢哈！
20分	<many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段
	那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？
	引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？
	引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？这个是表的字段名也就是id主键
	引用 4 楼 sizhouzhou 的回复: Quote: 引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？引用 3 楼 baidu_17449005 的回复: Quote: 引用 1 楼 sizhouzhou 的回复: <many-to-one name=”customer” class=”com.suxiaolei.hibernate.pojos.Customer” column=”customer_id” cascade=”save-update”> </many-to-one> <set name=”orders” inverse=”true” cascade=”all”> <key column=”customer_id” ></key> <one-to-many class=”com.suxiaolei.hibernate.pojos.Order”/> </set> 就是通过这两个配置关联的一个多对一一个一对多 <key column=”customer_id” ></key> column=”customer_id” cascade=”save-update”>这两个是关联的字段那<key> 元素中column=“customer_id”中这个”customer_id”如从哪儿来的呢？这个是表的字段名也就是id主键那也就是说主键的字段名是：表名_<id>中定义的列名，是么？就像上面的表名是：customer，id元素中定义的列名为：id，最后得出主键名为：customer_id?

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