怎么快速地统计在线人数 dxy？

sessid=session.sessionid
timeout=5 '分钟
dim conn,connstr,dbpath
dbpath="online.mdb"
'connstr="DRIVER={Microsoft Access Driver (*.mdb)};DBQ=" & Server.MapPath(dbpath)
connstr="provider=microsoft.jet.oledb.4.0;data source="&server.mappath(dbpath)
set conn=server.createobject("adodb.connection")
conn.open connstr
'删除过期的session
aa=dateadd("n",-timeout,now())
response.write sessid&"
"
response.write aa
sqld="delete * from counts where postdate conn.execute(sqld)

'保存id
sqlc="select sessid from counts where sessid='"&sessid&"'"
set rscheck=conn.execute(sqlc)
if rscheck.eof then
sqla="insert into counts(sessid,postdate)values('"&sessid&"','"&now()&"')"
conn.execute(sqla)
end if
rscheck.close
set rscheck=nothing

'计算人数
sqlall="select count(sessid) from counts"
set rs=conn.execute(sqlall)
countsall=rs(0)
rs.close
set rs=nothing

sql="select * from counts"
set rspredel=conn.execute(sql)
do until rspredel.eof
xxx=datediff("n",rspredel("postdate"),now())
if xxx>timeout then
countsall=countsall-1
end if
rspredel.movenext
loop
rspredel.close
set rspredel=nothing
conn.close
set conn=nothing
if countsall=0 then
countsall=1
end if
%>
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