asp xml 缓存类

　　复制代码 代码如下:
<%
Rem xml缓存类
--------------------------------------------------------------------
转载的时候请保留版权信息
作者:╰⑥月の雨╮
版本:ver1.0
本类部分借鉴 walkmanxml数据缓存类，使用更为方便 欢迎各位交流进步
--------------------------------------------------------------------
Class XmlCacheCls
Private m_DataConn 数据源,必须已经打开
Private m_CacheTime 缓存时间，单位秒 默认10分钟
Private m_XmlFile xml路径，用绝对地址,不需要加扩展名
Private m_Sql SQL语句
Private m_SQLArr (只读)返回的数据数组
Private m_ReadOn (只读)返回读取方式 1-数据库 2-xml 检测用

类的属性=========================================

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
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
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

类的辅助私有方法=========================================

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
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
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