ASP实例：利用缓存提高数据显示效率

网络整理 - 09-07

实例演示：先建立一个简单的数据库，写个function读取一下，写入一个dim变量temp中：

ASP代码

以下为引用的内容：
<%
Function DisplayRecords()
    Dim sql, conn, rs
    sql = "SELECT id, [szd_f], [szd_t] FROM admin"
    Set conn = Server.CreateObject("ADODB.Connection")
    conn.Open "DRIVER={Microsoft Access Driver (*.mdb)}; DBQ="&Server.MapPath("db.mdb")
    Set rs = Server.CreateObject("ADODB.Recordset")
    rs.Open sql, conn, 1, 3
    If Not rs.EOF Then
      Dim temp
      temp = "<table width=""90%"" align=""center"""
      temp = temp & " border=""1"" bordercolor=""silver"""
      temp = temp & " cellspacing=""2"" cellpadding=""0"">"
      temp = temp & "<tr bgcolor=""#CCDDEE""><td width=""5%"""
      temp = temp & ">ID</td><td>操作</td>"
      temp = temp & "<td>数值</td></tr>"
    While Not rs.EOF
      temp = temp & "<tr><td bgcolor=""#CCDDEE"">"
      temp = temp & rs("ID") & "</td><td>" & rs("szd_f")
      temp = temp & "</td><td>" & rs("szd_t")
      temp = temp & "</td></tr>"
      rs.MoveNext
    Wend
      temp = temp & "</table>"
      DisplayRecords = temp
    Else
      DisplayRecords = "Data Not Available."
    End If
    rs.Close
    conn.Close
    Set rs = Nothing
    Set conn = Nothing
End Function
'写入缓存
Function DisplayCachedRecords(Secs)
    Dim retVal, datVal, temp1
        retVal = Application("cache_demo")
        datVal = Application("cache_demo_date")
        If datVal = "" Then
            datVal = DateAdd("s",Secs,Now)
        End If
        temp1 = DateDiff("s", Now, datVal)
    If temp1 > 0 And retVal <> "" Then
        DisplayCachedRecords = retVal
        ' Debugging Code :
        Response.Write "<b><font color=""green"">利用缓存读取数据"
        Response.Write " ... (" & temp1 & " 秒剩余)</font></b>"