ASP实例：利用缓存提高数据显示效率_ASP教程

2024-05-04 11:03:33

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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>"
Response.Write "<br><br>"
Else
Dim temp2
' Change DisplayRecords() to the function whose
' value you want to cache
temp2 = DisplayRecords()
Application.Lock
Application("cache_demo") = temp2
Application("cache_demo_date") = DateAdd("s",Secs,Now)
Application.UnLock
DisplayCachedRecords = temp2
' Debugging Code :
Response.Write "<b><font color=""red"">刷新缓存显示 ..."
Response.Write "</font></b><br><br>"
End If
End Function
%>

<html>
<head>
<title>利用缓存从数据库---读取数据</title>
<style>
body, p, td { font-family:Sans-Serif; font-size:8pt; }
td { padding-left: 5; }
</style>
</head>
<body>
<%
Dim t1, t2
t1 = Timer
Response.Write DisplayCachedRecords(20)
t2 = Timer
%>
<p align="center">
停留时间: <%= Left((CDbl((t2 - t1) * 1000.0)), 5) %> ms
</p>
</body>
</html>

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