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.knowsky.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 %>
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