有主鍵自增長，解決插入失敗

--Hibernate中關於持久化類的配置  注意id下Generator子節點 class屬性配置爲native
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2">
    <class name="TestHibernateExpre.Entities.OrderListModel,TestHibernateExpre" table="OrderList">
        <id name="Orderid" column="id" type="int">
            <!--id中參數的設置問:native/assigned/foreign/increment-->
            <generator class="native"></generator>
        </id>
      </class>