<!-- 保存项目信息 -->
    <insert id="saveItem" parameterType="pd"  useGeneratedKeys="true" keyProperty="item_id">
        <selectKey resultType="int" order="AFTER" keyProperty="item_id">
              SELECT LAST_INSERT_ID()
        </selectKey>
        insert into 
            busi_repairitem_info
        (
            item_name,item_gongshi,item_danjia,create_name,modify_name,garage_id
        ) values (
            #{item_name},#{item_gongshi},#{item_danjia},#{create_name},#{modify_name},#{garage_id}
        )
    </insert>

这里是执行了插入语句之后,返回item_id到传入进来的pd对象中