"数据源 Public Property Set Conn(v) Set m_DataConn = v End Property Public Property Get Conn Conn = m_DataConn End Property
"缓存时间 Public Property Let CacheTime(v) m_CacheTime = v End Property Public Property Get CacheTime CacheTime = m_CacheTime End Property
"xml路径,用绝对地址 Public Property Let XmlFile(v) m_XmlFile = v End Property Public Property Get XmlFile XmlFile = m_XmlFile End Property
"Sql语句 Public Property Let Sql(v) m_Sql = v End Property Public Property Get Sql Sql = m_Sql End Property "返回记录数组 Public Property Get SQLArr SQLArr = m_SQLArr End Property
"返回读取方式 Public Property Get ReadOn ReadOn = m_ReadOn End Property
"类的析构=========================================
Private Sub Class_Initialize() "初始化类 m_CacheTime=60*10 "默认缓存时间为10分钟 End Sub
Private Sub Class_Terminate() "释放类
End Sub
"类的公共方法=========================================
Rem 读取数据 Public Function ReadData If FSOExistsFile(m_XmlFile) Then "存在xml缓存,直接从xml中读取 ReadDataFromXml m_ReadOn=2 Else ReadDataFromDB m_ReadOn=1 End If End Function
Rem 写入XML数据 Public Function WriteDataToXml If FSOExistsFile(m_XmlFile) Then "如果xml未过期则直接退出 If Not isXmlCacheExpired(m_XmlFile,m_CacheTime) Then Exit Function End If Dim rs Dim xmlcontent Dim k xmlcontent = "" xmlcontent = xmlcontent & "<?xml version=""1.0"" encoding=""gb2312""?>" & vbnewline xmlcontent = xmlcontent & " <root>" & vbnewline k=0 Set Rs = Server.CreateObject("Adodb.Recordset") Rs.open m_sql,m_DataConn,1 While Not rs.eof xmlcontent = xmlcontent & " <item " For Each field In rs.Fields xmlcontent = xmlcontent & field.name & "=""" & XMLStringEnCode(field.value) & """ " Next rs.movenext k=k+1 xmlcontent = xmlcontent & "></item>" & vbnewline Wend rs.close Set rs = Nothing xmlcontent = xmlcontent & " </root>" & vbnewline
Dim folderpath folderpath = Trim(left(m_XmlFile,InstrRev(m_XmlFile,"")-1)) Call CreateDIR(folderpath&"") "创建文件夹 WriteStringToXMLFile m_XmlFile,xmlcontent End Function
"类的私有方法=========================================
Rem 从Xml文件读取数据 Private Function ReadDataFromXml Dim SQLARR() "数组 Dim XmlDoc "XmlDoc对象 Dim objNode "子节点 Dim ItemsLength "子节点的长度 Dim AttributesLength "子节点属性的长度 Set XmlDoc=Server.CreateObject("Microsoft.XMLDOM") XmlDoc.Async=False XmlDoc.Load(m_XmlFile) Set objNode=XmlDoc.documentElement "获取根节点 ItemsLength=objNode.ChildNodes.length "获取子节点的长度 For items_i=0 To ItemsLength-1 AttributesLength=objNode.childNodes(items_i).Attributes.length "获取子节点属性的长度 For Attributes_i=0 To AttributesLength-1 ReDim Preserve SQLARR(AttributesLength-1,items_i) SQLArr(Attributes_i,items_i) = objNode.childNodes(items_i).Attributes(Attributes_i).Nodevalue Next Next Set XmlDoc = Nothing m_SQLArr = SQLARR End Function
Rem 从数据库读取数据 Private Function ReadDataFromDB Dim rs Dim SQLARR() Dim k k=0 Set Rs = Server.CreateObject("Adodb.Recordset") Rs.open m_sql,m_DataConn,1 If Not (rs.eof and rs.bof) Then While Not rs.eof Dim fieldlegth fieldlegth = rs.Fields.count ReDim Preserve SQLARR(fieldlegth,k) Dim fieldi For fieldi = 0 To fieldlegth-1 SQLArr(fieldi,k) = rs.Fields(fieldi).value Next rs.movenext k=k+1 Wend End If rs.close Set rs = Nothing m_SQLArr = SQLArr End Function
Rem 写xml文件 Private Sub WriteStringToXMLFile(filename,str) Dim fs,ts Set fs= createobject("scripting.filesystemobject") If Not IsObject(fs) Then Exit Sub Set ts=fs.OpenTextFile(filename,2,True) ts.writeline(str) ts.close Set ts=Nothing Set fs=Nothing End Sub
Rem 判断xml缓存是否到期 Private Function isXmlCacheExpired(file,seconds) Dim filelasttime filelasttime = FSOGetFileLastModifiedTime(file) If DateAdd("s",seconds,filelasttime) < Now Then isXmlCacheExpired = True Else isXmlCacheExpired = False End If End Function
Rem 得到文件的最后修改时间 Private Function FSOGetFileLastModifiedTime(file) Dim fso,f,s Set fso=CreateObject("Scripting.FileSystemObject") Set f=fso.GetFile(file) FSOGetFileLastModifiedTime = f.DateLastModified Set f = Nothing Set fso = Nothing End Function
Rem 文件是否存在 Public Function FSOExistsFile(file) Dim fso Set fso = Server.CreateObject("Scripting.FileSystemObject") If fso.FileExists(file) Then FSOExistsFile = true Else FSOExistsFile = false End If Set fso = nothing End Function
Rem xml转义字符 Private Function XMLStringEnCode(str) If str&"" = "" Then XMLStringEnCode="":Exit Function str = Replace(str,"<","<") str = Replace(str,">",">") str = Replace(str,""","'") str = Replace(str,"""",""") str = Replace(str,"&","&") XMLStringEnCode = str End Function
Rem 创建文件夹 Private function CreateDIR(byval LocalPath) On Error Resume Next Dim i,FileObject,patharr,path_level,pathtmp,cpath LocalPath = Replace(LocalPath,"","/") Set FileObject = server.createobject("Scripting.FileSystemObject") patharr = Split(LocalPath,"/") path_level = UBound (patharr) For i = 0 To path_level If i=0 Then pathtmp=patharr(0) & "/" Else pathtmp = pathtmp & patharr(i) & "/" End If cpath = left(pathtmp,len(pathtmp)-1) If Not FileObject.FolderExists(cpath) Then "Response.write cpath FileObject.CreateFolder cpath End If Next Set FileObject = Nothing If err.number<>0 Then CreateDIR = False err.Clear Else CreateDIR = True End If End Function End Class "设置缓存 Function SetCache(xmlFilePath,CacheTime,Conn,Sql) set cache=new XmlCacheCls Set cache.Conn=Conn cache.XmlFile=xmlFilePath cache.Sql=Sql cache.CacheTime=CacheTime cache.WriteDataToXml Set cache = Nothing End Function "读取缓存 Function ReadCache(xmlFilePath,Conn,Sql,ByRef ReadOn) set cache=new XmlCacheCls Set cache.Conn=conn cache.XmlFile=xmlFilePath cache.Sql=Sql cache.ReadData ReadCache=cache.SQLArr ReadOn=cache.ReadOn End Function %>
使用方法: 1 缓存数据到xml 代码: 复制代码 代码如下: <!--#include file="Conn.asp"--> <!--#include file="Xml.asp"--> <% set cache=new XmlCacheCls Set cache.Conn=conn cache.XmlFile=Server.Mappath("xmlcache/index/Top.xml") cache.Sql="select top 15 prod_id,prod_name,prod_uptime from tblProduction" cache.WriteDataToXml %>
2 读取缓存数据 代码: 复制代码 代码如下: <!--#include file="Conn.asp"--> <!--#include file="Xml.asp"--> <% set cache=new XmlCacheCls Set cache.Conn=conn cache.XmlFile=Server.Mappath("xmlcache/index/Top.xml") cache.Sql="select top 15 prod_id,prod_name,prod_uptime from tblProduction order by prod_id asc" cache.ReadData rsArray=cache.SQLArr if isArray(rsArray) then for i=0 to ubound(rsArray,2) for j=0 to ubound(rsArray,1) response.Write(rsArray(j,i)&"<br><br>") next next end if %> 缓存时间,单位秒 默认10分钟;也可以自己设定 cache.CacheTime=60*30 30分钟