简单的hibernate问题，关于*.hdb.xml文件

Question

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 2.0//EN" 
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd"><hibernate-mapping>
    <class
        name="ab.tiezi"
        table="tiezi"
        dynamic-update="false"
        dynamic-insert="false"
    >        <id
            name="unid"
            column="unid"
            type="long"
        >
            <generator class="native">
            </generator>
        </id>        <property
            name="biaoti"
            type="java.lang.String"
            update="true"
            insert="true"
            column="biaoti"
            length="20"
        />
       <property
            name="neirong"
            type="java.lang.String"
            update="true"
            insert="true"
            column="neirong"
            length="20"
        />
   </class>
</hibernate-mapping>其中的unid是你必须在类中的get set方法 ,