至於緩存的作用，我想我也不用再多說了，它的作用已經很明顯，特別是對於信息量非常大或是全數據庫頁面的網站，他能很好地利用主機的內存資源，加速ASP的執行效率，減輕服務器的負擔，而動網在這一方面做得是最突出的，像他現在的dvbbs7.1.0版，更是在緩存的利用上更上一層樓，前後台大多的操作都和緩存有關，而現在動網裡用的也就是迷城浪子的緩存類，下面列出動網的三大高手寫的ASP緩存類
木鳥寫的
復制代碼 代碼如下:
＇**********************************************
＇ vbs Cache類
＇
＇ 屬性valid，是否可用，取值前判斷
＇ 屬性name，cache名，新建對象後賦值
＇ 方法add(值,到期時間)，設置cache內容
＇ 屬性value，返回cache內容
＇ 屬性blempty，是否未設置值
＇ 方法makeEmpty，釋放內存，測試用
＇ 方法equal(變量1)，判斷cache值是否和變量1相同
＇ 方法expires(time)，修改過期時間為time
＇ 木鳥 2002.12.24
＇ http://www.aspsky.net/
＇**********************************************
class Cache
private obj ＇cache內容
private expireTime ＇過期時間
private expireTimeName ＇過期時間application名
private cacheName ＇cache內容application名
private path ＇uri
private sub class_initialize()
path=request.servervariables("url")
path=left(path,instrRev(path,"/"))
end sub
private sub class_terminate()
end sub
public property get blEmpty
＇是否為空
if isempty(obj) then
blEmpty=true
else
blEmpty=false
end if
end property
public property get valid
＇是否可用(過期)
if isempty(obj) or not isDate(expireTime) then
valid=false
elseif CDate(expireTime)<now then
valid=false
else
valid=true
end if
end property
public property let name(str)
＇設置cache名
cacheName=str & path
obj=application(cacheName)
expireTimeName=str & "expires" & path
expireTime=application(expireTimeName)
end property
public property let expires(tm)
＇重設置過期時間
expireTime=tm
application.lock
application(expireTimeName)=expireTime
application.unlock
end property
public sub add(var,expire)
＇賦值
if isempty(var) or not isDate(expire) then
exit sub
end if
obj=var
expireTime=expire
application.lock
application(cacheName)=obj
application(expireTimeName)=expireTime
application.unlock
end sub
public property get value
＇取值
if isempty(obj) or not isDate(expireTime) then
value=null
elseif CDate(expireTime)<now then
value=null
else
value=obj
end if
end property
public sub makeEmpty()
＇釋放application
application.lock
application(cacheName)=empty
application(expireTimeName)=empty
application.unlock
obj=empty
expireTime=empty
end sub
public function equal(var2)
＇比較
if typename(obj)<>typename(var2) then
equal=false
elseif typename(obj)="Object" then
if obj is var2 then
equal=true
else
equal=false
end if
elseif typename(obj)="Variant()" then
if join(obj,"^")=join(var2,"^") then
equal=true
else
equal=false
end if
else
if obj=var2 then
equal=true
else
equal=false
end if
end if
end function
end class
木鳥 類例子 vbs Cache類
＇
＇ 屬性valid，是否可用，取值前判斷
＇ 屬性name，cache名，新建對象後賦值
＇ 方法add(值,到期時間)，設置cache內容
＇ 屬性value，返回cache內容
＇ 屬性blempty，是否未設置值
＇ 方法makeEmpty，釋放內存，
＇ 方法DelCahe ,刪除內存
＇ 方法equal(變量1)，判斷cache值是否和變量1相同
＇ 方法expires(time)，修改過期時間為time
＇ 用法
set myCache=New Cache
myCache.name="BoardJumpList" ＇定義緩存名
if myCache.valid then ＇判斷是否可用(包括過期，與是否為空值)
response.write myCache.value ＇輸出
else
................
BoardJumpList=xxx
myCache.add BoardJumpList,dateadd("n",60,now) ＇寫入緩存 xxx.add 內容,過期時間
response.write BoardJumpList ＇輸出
end if
myCache.makeEmpty() 釋放內存
mycache.DelCahe() 刪除緩存
迷城浪子寫的
復制代碼 代碼如下:
Class Cls_Cache
Rem ==================使用說明====================
Rem = 本類模塊是動網先鋒原創，作者：迷城浪子。如采用本類模塊，請不要去掉這個說明。這段注釋不會影響執行的速度。
Rem = 作用：緩存和緩存管理類
Rem = 公有變量：Reloadtime 過期時間（單位為分鐘）缺省值為14400
Rem = MaxCount 緩存對象的最大值，超過則自動刪除使用次數少的對象。缺省值為300
Rem = CacheName 緩存組的總名稱，缺省值為"Dvbbs",如果一個站點中有超過一個緩存組，則需要外部改變這個值。
Rem = 屬性:Name 定義緩存對象名稱，只寫屬性。
Rem = 屬性:value 讀取和寫入緩存數據。
Rem = 函數：ObjIsEmpty()判斷當前緩存是否過期。
Rem = 方法：DelCahe(MyCaheName)手工刪除一個緩存對象，參數是緩存對象的名稱。
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
迷城浪子 類例子
Set WydCache=New Cls_Cache
WydCache.Reloadtime=0.5 ＇定義過期時間 (以分鐘為單會)
WydCache.CacheName="pages" ＇定義緩存名
IF WydCache.ObjIsEmpty() Then ＇＇判斷是否可用(包括過期，與是否為空值)
Response.write WydCache.Value
Else
..................
BoardJumpList=xxx
WydCache.Value=BoardJumpList ＇寫入內容
Response.write BoardJumpList
End if
mycache.DelCahe("緩存名") 刪除緩存
slightboy 寫的 ＇========================
復制代碼 代碼如下:
＇clsCache.asp
＇========================
＇== begin : 2004-6-26 21:51:47
＇== copyright : slightboy (C)1998-2004
＇== email :
[email protected] ＇========================
＇========================
＇ Dim Application(2)
＇ Application(0) Counter 計數器
＇ Application(1) dateTime 放置時間
＇ Application(2) Content 緩存內容
Public PREFIX
Public PREFIX_LENGTH
Private Sub Class_Initialize()
PREFIX = "Cached:"
PREFIX_LENGTH = 7
End Sub
Private Sub Class_Terminate
End Sub
＇ 設置變量
Public Property Let Cache(ByRef Key, ByRef Content)
Dim Item(2)
Item(0) = 0
Item(1) = Now()
IF (IsObject(Content)) Then
Set Item(2) = Content
Else
Item(2) = Content
End IF
Application.Unlock
Application(PREFIX & Key) = Item
Application.Lock
End Property
＇ 取出變量 計數器++
Public Property Get Cache(ByRef Key)
Dim Item
Item = Application(PREFIX & Key)
IF (IsArray(Item)) Then
IF (IsObject(Item)) Then
Set Cache = Item(2)
Else
Cache = Item(2)
End IF
Application(PREFIX & Key)(0) = Application(PREFIX & Key)(0) + 1
Else
Cache = Empty
End IF
End Property
＇ 檢查緩存對象是否存在
Public Property Get Exists(ByRef Key)
Dim Item
Item = Application(PREFIX & Key)
IF (IsArray(Item)) Then
Exists = True
Else
Exists = False
End IF
End Property
＇ 得到計數器數值
Public Property Get Counter(ByRef Key)
Dim Item
Item = Application(PREFIX & Key)
IF (IsArray(Item)) Then
Counter = Item(0)
End IF
End Property
＇ 設置計數器時間
Public Property Let dateTime(ByRef Key, ByRef SetdateTime)
Dim Item
Item = Application(PREFIX & Key)
IF (IsArray(Item)) Then
Item(1) = SetdateTime
End IF
End Property
＇ 得到計數器時間
Public Property Get dateTime(ByRef Key)
Dim Item
Item = Application(PREFIX & Key)
IF (IsArray(Item)) Then
dateTime = Item(1)
End IF
End Property
＇ 重置計數器
Public Sub ResetCounter()
Dim Key
Dim Item
Application.Unlock
For Each Key in Application.Contents
IF (Left(Key, PREFIX_LENGTH) = PREFIX) Then
Item = Application(Key)
Item(0) = 0
Application(Key) = Item
End IF
Next
Application.Lock
End Sub
＇ 刪除某以緩存
Public Sub Clear(ByRef Key)
Application.Contents.Remove(PREFIX & Key)
End Sub
＇ 清空沒有使用的緩存
Public Sub ClearUnused()
Dim Key, Keys, KeyLength, KeyIndex
For Each Key in Application.Contents
IF (Left(Key, PREFIX_LENGTH) = PREFIX) Then
IF (Application(Key)(0) = 0) Then
Keys = Keys & VBNewLine & Key
End IF
End IF
Next
Keys = Split(Keys, VBNewLine)
KeyLength = UBound(Keys)
Application.Unlock
For KeyIndex = 1 To KeyLength
Application.Contents.Remove(Keys(KeyIndex))
Next
Application.Lock
End Sub
＇ 清空所有緩存
Public Sub ClearAll()
Dim Key, Keys, KeyLength, KeyIndex
For Each Key in Application.Contents
IF (Left(Key, PREFIX_LENGTH) = PREFIX) Then
Keys = Keys & VBNewLine & Key
End IF
Next
Keys = Split(Keys, VBNewLine)
KeyLength = UBound(Keys)
Application.Unlock
For KeyIndex = 1 To KeyLength
Application.Contents.Remove(Keys(KeyIndex))
Next
Application.Lock
End Sub
End Class
slightboyn 類例子 Set Wyd=New JayCache
Wyd.dateTime("Page")=時 間
If Wyd.Exists("Page") Then
Response.write Wyd.Cache("Page") ＇輸出
Else
Wyd.Cache("Page")=xxx 寫入
Responxe.write xxx
End IF
Wyd.Clear("page")＇刪除緩存
