程序代码
<%
'by xilou,www.chinacms.org,20090115
'最后更新：20090115
'修改记录：无
CONST CACHEPREFIX = "CACHE_" '缓存前缀,不能为空
'说明：
' 1,缓存的格式为Application(CACHEPREFIX & key) = array("缓存key","缓存时间","缓存内容","缓存说明","到期时间")
' 2,缓存key不区分大小写
'添加缓存,不检查缓存是否存在，如果存在则相当于更新缓存
'varAry : 参数，格式为:array("缓存key","缓存时间","缓存内容","缓存说明")
' 缓存key ：application()格式相同
' 缓存时间：单位秒,可以为负数,表示立即过期,可以为空，空或不是数字则默认为20分钟过期
' 缓存内容：缓存数据，不支持对对象的缓存
' 缓存说明：缓存描述说明
Function AddCache(varAry)
Dim c,ary(4)
If Not IsArray(varAry) Then
Response.Write "Error:AddCache(varAry)参数错误，参数不是数组"
Response.End()
End If
If UBound(varAry) <> 3 Then
Response.Write "Error:AddCache(varAry)参数错误，数组长度错误"
Response.End()
End If
If varAry(0) = "" Then
Response.Write "Error:AddCache(varAry)错误，key不能为空"
Response.End()
End If
If varAry(1) = "" or Not IsNumeric(varAry(1)) Then varAry(1) = 1200
Application.Lock()
Application(CACHEPREFIX & varAry(0)) = array(varAry(0),varAry(1),varAry(2),varAry(3),DateAdd("s",varAry(1),Now()))
Application.UnLock()
End Function
'检查某个缓存是否存在,存在返回True否则返回False
'key : 缓存key
Function CheckCache(key)
Dim k
For Each k In Application.Contents
If LCase(k) = LCase(CACHEPREFIX & key) Then CheckCache = True : Exit Function
Next
CheckCache = False
End Function
'获取缓存
'返回数组，格式为：array("缓存key","缓存时间","缓存内容","缓存说明","到期时间",是否过期True|False)
'如果不存在则出错，所以获取之前先用CheckCache(key)检查
Function GetCache(key)
Dim app,isExp
app = Application(CACHEPREFIX & key)
isExp = False
If DateDiff("s",Now(),app(4)) <= 0 Then isExp = True
GetCache = Array(app(0),app(1),app(2),app(3),app(4),isExp)
End Function
'清除缓存
Function RemoveCache(key)
Application.Lock()
Application.Contents.Remove(CACHEPREFIX & key)
Application.UnLock()
End Function
'更新缓存,如果缓存不存在则出错，所以更新之前先用CheckCache(key)检查
'varAry : 参数，格式为:array("缓存key","缓存时间","缓存内容","缓存说明")
' 缓存key ：application()格式相同
' 缓存时间：单位秒,可以为负数,表示立即过期,可以为空，空或不是数字则默认为20分钟过期
' 缓存内容：缓存数据，不支持对对象的缓存
' 缓存说明：缓存描述说明
'注意 ： 如果不更新varAry某个值则设置该值为null即可，
' 如UpdateCache(array("key",null,"内容",null)),就是不更新过期时间和说明
Function UpdateCache(varAry)
Dim app
app = GetCache(varAry(0))
If Not IsNull(varAry(1)) Then app(1) = varAry(1)
If Not IsNull(varAry(2)) Then app(2) = varAry(2)
If Not IsNull(varAry(3)) Then app(3) = varAry(3)
If app(1) = "" or Not IsNumeric(app(1)) Then app(1) = 1200
Application.Lock()
Application(CACHEPREFIX & app(0)) = array(app(0),app(1),app(2),app(3),DateAdd("s",app(1),Now()))
Application.UnLock()
End Function
'www.downcodes.com
'打印cache，做调试用
Function PrintCache(key)
Dim app,i,t
If CheckCache(key) Then
app = GetCache(key)
Response.Write "<pre>{"&chr(10)
Response.Write chr(32) & "缓存名称" & chr(32) & ":" & chr(32) & CACHEPREFIX & app(0) & chr(10)
Response.Write chr(32) & "缓存key " & chr(32) & ":" & chr(32) & app(0) & chr(10)
Response.Write chr(32) & "缓存时间" & chr(32) & ":" & chr(32) & app(1) & chr(10)
Response.Write chr(32) & "到期时间" & chr(32) & ":" & chr(32) & app(4) & chr(10)
Response.Write chr(32) & "是否到期" & chr(32) & ":" & chr(32) & app(5) & chr(10)
Response.Write chr(32) & "缓存说明" & chr(32) & ":" & chr(32) & app(3) & chr(10)
'内容
Response.Write chr(32) & "缓存内容" & chr(32) & ":" & chr(32)
t = VarType(app(2))
If InStr(",0,1,2,3,4,5,6,7,8,11,",","&t&",") > 0 Then
Response.Write app(2)
Else
Response.Write TypeName(app(2))
End If
Response.Write chr(10)
Response.Write "}</pre>"&chr(10)
Else
Response.Write "不存在该缓存"
End If
End Function
'-----------demo
Sub br(str)
Response.Write str & "<br />" & vbcrlf
End Sub
'RemoveCache "xilou"
'AddCache Array("xilou","",array("数据内容"),"缓存说明")
br CheckCache("xilou")
PrintCache "xilou"
Dim app
If CheckCache("xilou") Then
app = GetCache("xilou") '获取
UpdateCache array(app(0),null,"testsfsfsf",null)'更新
Else
AddCache array("xilou","","内容","说明")
End If
'Dim k
'For Each k In Application.Contents
'br k
'Next
%>