如何用數(shù)據(jù)庫制作一個多用戶版的計數(shù)器？

count.asp

' 計數(shù)器的核心程序.

%
Set conn = Server.CreateObject("ADODB.Connection")
dbpath=server.MapPath("count.mdb")
conn.open "driver={Microsoft Access Driver (*.mdb)};dbq="DbPath
user=Request.QueryString("user")

sql="update counttable set curvalue=curvalue+1 where user='"user"'"

' 計數(shù)值加1.
conn.Execute sql
sql="select curvalue from counttable where user='"user"'"
set rs=conn.Execute(sql)

function chgimg(curvalue)
dim s,i,g
s=cstr(curvalue)
for i=1 to len(s)

' 定義chgimg函數(shù),將計數(shù)值用圖形表示.

g=g "img src=1/" mid(s,i,1) ".gif align=bottom>"

' 在正式使用計數(shù)器時,圖片的路徑要用實際路徑.

next
chgimg=g
end function

toimg=chgimg(rs("curvalue"))
toimg="document.write(" "'" toimg "')"

' 調用chgimg函數(shù)傳入計數(shù)器值.

Response.Write(toimg)

' 輸出.
rs.close
set rs=nothing
conn.Close
set conn=nothing
%>

get.htm

' 申請表單.
form method="POST" action="getcl.asp">
p>用戶名input type="text" name="user" size="20">/p>
p>計數(shù)器初始值input type="text" name="curvalue" size="20">/p>
p>主頁地址input type="text" name="pageurl" size="20">/p>
p>input type="submit" value="提交" name="B1">input type="reset" value="重寫" name="B2">/p>
/form>

getcl.asp

' 處理用戶的輸入的表單,并加入數(shù)據(jù)庫.
%
Set conn = Server.CreateObject("ADODB.Connection")

' 建立與數(shù)據(jù)庫的連接.
dbpath=server.MapPath("count.mdb")

' 取得數(shù)據(jù)庫的實際路徑.
conn.open "driver={Microsoft Access Driver (*.mdb)};dbq="DbPath
set rs=server.CreateObject("adodb.recordset")

user=Request.Form("user")
pageurl=Request.Form("pageurl")
curvalue=Request.Form("curvalue")

' 取得用戶信息.

sql="select * from counttable where user='"user"'"

' 檢查用戶名是否存在.
rs.Open sql,conn,1,3
if not rs.EOF then
Response.Write"title>申請出錯/title>"
Response.Write"噢,用戶名已經(jīng)存在!請重新選擇.../title>"

Response.End

' 停止向下處理,要求用戶重填.
end if

rs.AddNew
rs("user")=user
rs("pageurl")=pageurl
rs("curvalue")=curvalue
rs.Update

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