蛙蛙推荐:asp中模拟.net中的cache

作者：整理

<%
Sub ShowRsArr(rsArr)
‘’2005-1-27 by 蛙蛙王子
‘’用表格显示记录集getrows生成的数组的表结构
‘’
Response.Write "<table width=100% border=0 cellspacing=0 cellpadding=0>"
If Not IsEmpty(rsArr) Then
For y=0 To Ubound(rsArr,2)
Response.Write"<tr>"
for x=0 to Ubound(rsArr,1)
Response.Write "<td>"&rsArr(x,y)&"</td>"
next
Response.Write"</tr>"

next
Else
Response.Write "<tr>"
Response.Write "<td colspan="&rs.fields.count-1&">No Records</td>"
Response.Write "</tr>"
End If
Response.Write "</table>"
End Sub
Class Cls_Cache
Rem ==================使用说明=================================================================================
Rem = 本类模块是动网先锋原创，作者：迷城浪子。如采用本类模块，请不要去掉这个说明。这段注释不会影响执行的速度。=
Rem = 作用：缓存和缓存管理类 =
Rem = 公有变量：Reloadtime 过期时间（单位为分钟）缺省值为14400, =
Rem = MaxCount 缓存对象的最大值，超过则自动删除使用次数少的对象。缺省值为300 =
Rem = CacheName 缓存组的总名称，缺省值为"Dvbbs",如果一个站点中有超过一个缓存组，则需要外部改变这个值。 =
Rem = 属性:Name 定义缓存对象名称，只写属性。 =
Rem = 属性:value 读取和写入缓存数据。 =
Rem = 函数：ObjIsEmpty()判断当前缓存是否过期。 =
Rem = 方法：DelCahe(MyCaheName)手工删除一个缓存对象，参数是缓存对象的名称。 =
Rem ===========================================================================================================
Public Reloadtime,MaxCount,CacheName
Private LocalCacheName,CacheData,DelCount
Private Sub Class_Initialize()
Reloadtime=14400
CacheName="Dvbbs"
End Sub
Private Sub SetCache(SetName,NewValue)
Application.Lock
Application(SetName) = NewValue
Application.unLock
End Sub
Private Sub makeEmpty(SetName)
Application.Lock
Application(SetName) = Empty
Application.unLock
End Sub
Public Property Let Name(ByVal vNewValue)
LocalCacheName=LCase(vNewValue)
End Property
Public Property Let Value(ByVal vNewValue)
If LocalCacheName<>"" Then
CacheData=Application(CacheName&"_"&LocalCacheName)
If IsArray(CacheData) Then
CacheData(0)=vNewValue
CacheData(1)=Now()
Else
ReDim CacheData(2)
CacheData(0)=vNewValue
CacheData(1)=Now()
End If
SetCache CacheName&"_"&LocalCacheName,CacheData
Else
Err.Raise vbObjectError + 1, "DvbbsCacheServer", " please change the CacheName."
End If
End Property
Public Property Get Value()
If LocalCacheName<>"" Then
CacheData=Application(CacheName&"_"&LocalCacheName)
If IsArray(CacheData) Then
Value=CacheData(0)
Else
Err.Raise vbObjectError + 1, "DvbbsCacheServer", " The CacheData Is Empty."
End If
Else
Err.Raise vbObjectError + 1, "DvbbsCacheServer", " please change the CacheName."
End If
End Property
Public Function ObjIsEmpty()
ObjIsEmpty=True
CacheData=Application(CacheName&"_"&LocalCacheName)
If Not IsArray(CacheData) Then Exit Function
If Not IsDate(CacheData(1)) Then Exit Function
If DateDiff("s",CDate(CacheData(1)),Now()) < 60*Reloadtime Then
ObjIsEmpty=False
End If
End Function
Public Sub DelCahe(MyCaheName)
makeEmpty(CacheName&"_"&MyCaheName)
End Sub
End Class
Dim strconn,rs
strconn="Driver={sql server};server=localhost;database=northwind;uid=sa;pwd=sa;"
Public Function GetEmployees()
Dim SQL,Rs,Cache
Set Cache=New Cls_Cache
Cache.Reloadtime=0.5
Cache.CacheName="wawa"
Cache.Name="Employees"
If Cache.ObjIsEmpty() Then
Set rs=Server.CreateObject("ADODB.Recordset")
SQL = "select EmployeeID, LastName, FirstName from employees order by employeeid desc"
Rs.Open SQL,strconn,1,1
Cache.value = Rs.GetRows(5)
Rs.Close:Set Rs=Nothing
End If
GetEmployees=Cache.Value
Set Cache=Nothing
End Function
ShowRsArr(GetEmpLoyees)
%>
<script>
function TimeOut(a){
var c=a-1;
if(c==0) {
window.location.href=window.location;
}else{
document.all.abc.innerHTML="离缓存结束还有："+c+"秒";
window.setTimeout(‘’TimeOut(‘’+c+‘’)‘’,1000);
}
}
</script>
<body onload="TimeOut(‘’30‘’)">
<div id="abc"></div>

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