hibernate 多主键

<class name="com.fulitong.framework.gy.domain.GyCcCkjzylb" table="GY_CC_CKJZYLB">
        <composite-id name="id" class="com.fulitong.framework.gy.domain.GyCcCkjzylbId">
            <key-property name="jznf" type="java.lang.String">
                <column name="JZNF" length="50" />
            </key-property>
            <key-property name="ckbm" type="java.lang.String">
                <column name="CKBM" length="50" />
            </key-property>
            <key-property name="flbh" type="java.lang.String">
                <column name="FLBH" length="50" />
            </key-property>
        </composite-id>
        <property name="kcyl" type="java.lang.Double">
            <column name="KCYL" precision="24" scale="9" />
        </property>