这个写法哪里有问题

        set rs=server.CreateObject("adodb.recordset")
        if request2.form("id")="" then
            rsstr="select ppic from light where id="&request2.form("id")
            rs.open rsstr,conn,1,1
            if rs.recordcount=0 then
                rs.open "select * from light",conn,1,3
                rs.addnew
                rs("ppic")=request2.form("ppic")
                rs("pictime")=date()
                rs.update
            else
            response.write "<script language='javascript'>"
            response.write "alert('不能上传');"
            response.write "window.location.href='javascript:history.go(-1)';"
            response.write "</script>"
            end if
        end if