sql中更新数据库用到declare @a in

declare @a in

update TB_Class set @a=1,name='李小龙' where ID=1

这样就可以像更新哪个就更新哪个了

例如ibatisnet中需要更新的时候：

 <update id="Update" parameterClass="OrderStatusNeedSendToCps">
      <!--update N_OrderStatusNeedSendToCps
      set
      OrderStatus=#OrderStatus#
      ,CpsCode=#CpsCode#
      ,ContentType=#ContentType#
      ,IsSendToCps=#IsSendToCps#
      ,SendTime=getdate()
      ,ErrMessage=#ErrMessage#
      where Id=#Id#-->

      declare @a int
      update N_OrderStatusNeedSendToCps set @a=
      <dynamic>
        <isNotNull prepend="," property="OrderStatus">
          OrderStatus=#OrderStatus#
        </isNotNull>
        <isNotNull prepend="," property="CpsCode">
          CpsCode=#CpsCode#
        </isNotNull>
        <isNotNull prepend="," property="ContentType">
          ContentType=#ContentType#
        </isNotNull>
        <isNotNull prepend="," property="IsSendToCps">
          IsSendToCps=#IsSendToCps#
        </isNotNull>
        <isNotNull prepend="," property="SendTime">
          SendTime=getdate()
        </isNotNull>
        <isNotNull prepend="," property="ErrMessage">
          ErrMessage=#ErrMessage#
        </isNotNull>
      </dynamic>
      where Id=#Id#
    </update>