hibernate外键取值问题

XML code

<class name="com.actransfer.hibernate.po.AcWebDiscount" table="AC_WebDiscount" schema="dbo">        <id name="discountId" type="java.lang.String">            <column name="Discount_Id" length="50" />        </id>        <many-to-one name="acStockPile" class="com.actransfer.hibernate.po.AcStockPile" fetch="select">            <column name="Product_Id" length="50" />        </many-to-one>        <property name="packageId" type="java.lang.String">            <column name="Package_Id" length="50" />        </property>        <property name="webFlag" type="java.lang.String">            <column name="Web_Flag" length="50" />        </property>        <property name="salePrice" type="java.lang.Float">            <column name="Sale_Price" precision="53" scale="0" />        </property>        <property name="stockProductSort" type="java.lang.Integer">            <column name="StockProduct_Sort" />        </property>        <property name="discountRate" type="java.lang.Float">            <column name="Discount_Rate" precision="53" scale="0" />        </property>        <property name="discountPrice" type="java.lang.Float">            <column name="Discount_Price" precision="53" scale="0" />        </property>        <property name="discountUpdate" type="java.lang.Integer">            <column name="Discount_Update" />        </property>    </class>

表上有一个外键字段 Product_Id 怎么根据Product_Id查询出数据 请指教

[解决办法]
没看明白，你要查那个表啊？要是查这个表不是太难吧。还有你要全查、还是要查一个啊？