mybities insert 的时候得到主键的值

例子

    <insert id="insertBill" parameterType="Bill">        insert        into bill(        bill_type,        bill_money,        bill_date,        user_id,        bill_title,        bill_status        )        values        (        #{billType},        #{billMoney},        #{billDate},        #{userId},        #{billTitle},        #{billStatus}        )        <selectKey resultType="java.lang.Integer" keyProperty="billId" order="AFTER">            SELECT LAST_INSERT_ID() as id        </selectKey>    </insert>