关于投票的问题

我想做到一个ip投票一次后，在tpip表中存储其ip和时间,2分钟只能不能再进行投票.现在遇到一个问题就是.如果他是第一次投票，该如何判断.我用total=rs1.recordcount无法得到记录数目

<!--#include file="conn1.asp"-->

<%

id=trim(request.querystring("userid"))
username=trim(request.querystring("username"))
Caption=trim(request.querystring("caption"))



come_ip = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
if come_ip = "" then
come_ip=Request.ServerVariables("remote_addr")
end if
if instr(come_ip,"'")>0 then
come_ip="0.0.0.0"
end if


'+==========================================================+
'+==========================================================+

set rs1=server.createobject("adodb.recordset")
sql = "select * from tpip where ip='" & come_ip & "'"
rs1.open sql,conn,1,1
if not rs1.eof then
total=rs1.recordcount
response.write(total)

if abs(DateDiff("n", Now, rs1("dtime")))=<2 then
response.write("错误信息")
else if abs(DateDiff("n", Now, rs1("dtime")))=>2 or total <=0 then

set rs2=server.createobject("ADODB.recordset")
sql="select * from Dv_bbs1 where postuserid=" &id& "and dateandtime=#" & caption & "# "
rs2.open sql,conn,1,2
rs2("isvote")=rs2("isvote")+1
response.write "您已经为" & username & "投票成功"
rs2.update
rs2.close
end if
end if




rs1.update
rs1.close
end if
set rs=server.createobject("ADODB.recordset")
rs.Open "select * from tpip",conn,1,3

if not rs.eof and not rs.bof then
rs.addnew
rs("ip")=come_ip
rs("dtime")=now()
rs.update
rs.close
end if