代码哪里需要修改，小弟我想通过id判断ppic字段不为空

if set rs=conn.execute("select * from light where id="&request2.form("id")&" and ppic is not null") then

		response.write "<script language='javascript'>"

		response.write "alert('已有数据，请先删除');"

		response.write "window.location.href='modify.asp?id="&request.form("id")&"';"

		response.write "</script>"

else

	if request2.form("id")<>"" then

		set rs=server.CreateObject("adodb.recordset")

		rsstr="select ppic from light where id="&request2.form("id")

		rs.open rsstr,conn,1,1

		if rs.recordcount=0 then

			set rss=server.CreateObject("adodb.recordset")

			rss.open "select * from light",conn,1,3

			rss.addnew

			rss("ppic")=request2.form("ppic")

			rss("pictime")=date()

			rss.update

			rss.close

			set rss=nothing

		else

			response.write "<script language='javascript'>"

			response.write "alert('不能上传');"

			response.write "window.location.href='modify.asp?id="&request2.form("id")&"';"

			response.write "</script>"

		end if

		rs.close

		set rs=nothing

	end if