Access2000数据库80万记录通用快速分页类

作者： unknow

刚用的，不错。给大家看看
   主要思路: 用一条语句统计(Count)出记录数(而不在查询时获得 RecordCount 属性), 缓存在 Cookies 中, 跳转时就不用再次统计. 使用 ADO 的 AbsolutePage 属性进行页面跳转即可. 为方便调用而写成类, 代码主要地方已有说明

硬件环境: AMD Athlon XP 2600+, 256 DDR
软件环境: MS Windows 2000 Advanced Server + IIS 5.0 + Access 2000 + IE 6.0
测试结果: 初次运行在 250(首页) - 400(末页)毫秒, (记录数缓存后)在页面间跳转稳定在 47 毫秒以下.第1页跳到最后一页不多于 350 毫秒

适用范围: 用于普通分页. 不适用于有较复杂的查询时: 如条件为"[Title] Like @#%最爱%@#", 查询的时间大大增加, 就算 Title 字段作了索引也没用. :(
<%@LANGUAGE = "VBScript" CODEPAGE="936"%>
<%Option Explicit%>
<%
Dim intDateStart
intDateStart = Timer()
Rem ## 打开数据库连接
Rem #################################################################
  function f__OpenConn()
   Dim strDbPath
   Dim connstr
   strDbPath = "../db/test.mdb"
   connstr  = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="
   connstr  = connstr & Server.MapPath(strDbPath)
   Set conn  = Server.CreateObject("Adodb.Connection")
   conn.open connstr
  End function
Rem #################################################################

Rem ## 关闭数据库连接
Rem #################################################################
  function f__CloseConn()
   If IsObject(conn) Then
    conn.close
   End If
   Set conn = nothing
  End function
Rem #################################################################
Rem 获得执行时间
Rem #################################################################
function getTimeOver(iflag)
  Dim tTimeOver
  If iflag = 1 Then
   tTimeOver = FormatNumber(Timer() - intDateStart, 6, true)
   getTimeOver = " 执行时间: " & tTimeOver & " 秒"
  Else
   tTimeOver = FormatNumber((Timer() - intDateStart) * 1000, 3, true)
   getTimeOver = " 执行时间: " & tTimeOver & " 毫秒"
  End If
End function
Rem #################################################################
Class Cls_PageView
  Private sbooInitState
  Private sstrCookiesName
  Private sstrPageUrl
  Private sstrPageVar
  Private sstrTableName
  Private sstrFieldsList
  Private sstrCondiction
  Private sstrOrderList
  Private sstrPrimaryKey
  Private sintRefresh

  Private sintRecordCount
  Private sintPageSize
  Private sintPageNow
  Private sintPageMax

  Private sobjConn

  Private sstrPageInfo

  Private Sub Class_Initialize
   Call ClearVars()
  End Sub

  Private Sub class_terminate()
   Set sobjConn = nothing
  End Sub

  Public Sub ClearVars()
   sbooInitState = False
   sstrCookiesName = ""
   sstrPageUrl = ""
   sstrPageVar = "page"
   sstrTableName = ""
   sstrFieldsList = ""
   sstrCondiction = ""
   sstrOrderList = ""
   sstrPrimaryKey = ""
   sintRefresh = 0

   sintRecordCount = 0
   sintPageSize = 0
   sintPageNow = 0
   sintPageMax = 0
  End Sub

  Rem ## 保存记录数的 Cookies 变量
  Public Property Let strCookiesName(Value)
   sstrCookiesName = Value
  End Property

  Rem ## 转向地址
  Public Property Let strPageUrl(Value)
   sstrPageUrl = Value
  End Property

  Rem ## 表名
  Public Property Let strTableName(Value)
   sstrTableName = Value
  End Property

  Rem ## 字段列表
  Public Property Let strFieldsList(Value)
   sstrFieldsList = Value
  End Property

  Rem ## 查询条件
  Public Property Let strCondiction(Value)
   If Value <> "" Then
    sstrCondiction = " WHERE " & Value
   Else
    sstrCondiction = ""
   End If
  End Property

  Rem ## 排序字段, 如: [ID] ASC, [CreateDateTime] DESC
  Public Property Let strOrderList(Value)
   If Value <> "" Then
    sstrOrderList = " ORDER BY " & Value
   Else
    sstrOrderList = ""
   End If
  End Property

  Rem ## 用于统计记录数的字段
  Public Property Let strPrimaryKey(Value)
   sstrPrimaryKey = Value
  End Property

  Rem ## 每页显示的记录条数
  Public Property Let intPageSize(Value)
   sintPageSize = toNum(Value, 20)
  End Property

  Rem ## 数据库连接对象
  Public Property Let objConn(Value)
   Set sobjConn = Value
  End Property

  Rem ## 当前页
  Public Property Let intPageNow(Value)
   sintPageNow = toNum(Value, 1)
  End Property

  Rem ## 页面参数
  Public Property Let strPageVar(Value)
   sstrPageVar = Value
  End Property

  Rem ## 是否刷新. 1 为刷新, 其他值则不刷新
  Public Property Let intRefresh(Value)
   sintRefresh = toNum(Value, 0)
  End Property

  Rem ## 获得当前页
  Public Property Get intPageNow()
   intPageNow = singPageNow
  End Property

  Rem ## 分页信息
  Public Property Get strPageInfo()
   strPageInfo = sstrPageInfo
  End Property

  Rem ## 取得记录集, 二维数组或字串, 在进行循环输出时必须用 IsArray() 判断
  Public Property Get arrRecordInfo()
   If Not sbooInitState Then
    Exit Property
   End If

   Dim rs, sql
   sql = "SELECT " & sstrFieldsList & _
    " FROM " & sstrTableName & _
    sstrCondiction & _
    sstrOrderList

   Set rs = Server.CreateObject("Adodb.RecordSet")
   rs.open sql, sobjConn, 1, 1
   If Not(rs.eof or rs.bof) Then
    rs.PageSize = sintPageSize
    rs.AbsolutePage = sintPageNow
    If Not(rs.eof or rs.bof) Then
     arrRecordInfo = rs.getrows(sintPageSize)
    Else
     arrRecordInfo = ""
    End If
   Else
    arrRecordInfo = ""
   End If
   rs.close
   Set rs = nothing
  End Property

  Rem ## 初始化记录数
  Private Sub InitRecordCount()
   sintRecordCount = 0
   If Not(sbooInitState) Then Exit Sub
   Dim sintTmp
   sintTmp = toNum(request.Cookies("_xp_" & sstrCookiesName), -1)
   If ((sintTmp < 0) Or (sintRefresh = 1))Then
    Dim sql, rs
    sql = "SELECT COUNT(" & sstrPrimaryKey & ")" & _
     " FROM " & sstrTableName & _
     sstrCondiction
    Set rs = sobjConn.execute(sql)
    If rs.eof or rs.bof Then
     sintTmp = 0
    Else
     sintTmp = rs(0)
    End If
    sintRecordCount = sintTmp

    response.Cookies("_xp_" & sstrCookiesName) = sintTmp
   Else
    sintRecordCount = sintTmp
   End If
  End Sub

  Rem ## 初始化分页信息
  Private Sub InitPageInfo()
   sstrPageInfo = ""
   If Not(sbooInitState) Then Exit Sub

   Dim surl
   surl = sstrPageUrl
   If Instr(1, surl, "?", 1) > 0 Then
    surl = surl & "&" & sstrPageVar & "="
   Else
    surl = surl & "?" & sstrPageVar & "="
   End If

   If sintPageNow <= 0 Then sintPageNow = 1
   If sintRecordCount mod sintPageSize = 0 Then
    sintPageMax = sintRecordCount \ sintPageSize
   Else
    sintPageMax = sintRecordCount \ sintPageSize + 1
   End If
   If sintPageNow > sintPageMax Then sintPageNow = sintPageMax

   If sintPageNow <= 1 then
    sstrPageInfo = "首页上一页"
   Else
    sstrPageInfo = sstrPageInfo & " <a href=""" & surl & "1"">首页</a>"
    sstrPageInfo = sstrPageInfo & " <a href=""" & surl & (sintPageNow - 1) & """>上一页</a>"
   End If

   If sintPageMax - sintPageNow < 1 then
    sstrPageInfo = sstrPageInfo & " 下一页末页 "
   Else
    sstrPageInfo = sstrPageInfo & " <a href=""" & surl & (sintPageNow + 1) & """>下一页</a> "
    sstrPageInfo = sstrPageInfo & " <a href=""" & surl & sintPageMax & """>末页</a> "
   End If

   sstrPageInfo = sstrPageInfo & " 页次：<strong><font color=""#990000"">" & sintPageNow & "</font> / " & sintPageMax & " </strong>"
   sstrPageInfo = sstrPageInfo & " 共 <strong>" & sintRecordCount & "</strong> 条记录 <strong>" & sintPageSize & "</strong> 条/页 "
  End Sub

  Rem ## 长整数转换
  Private function toNum(s, Default)
   s = s & ""
   If s <> "" And IsNumeric(s) Then
    toNum = CLng(s)
   Else
    toNum = Default
   End If
  End function

  Rem ## 类初始化
  Public Sub InitClass()
   sbooInitState = True
   If Not(IsObject(sobjConn)) Then sbooInitState = False
   Call InitRecordCount()
   Call InitPageInfo()
  End Sub
End Class
Dim strLocalUrl
strLocalUrl = request.ServerVariables("SCRIPT_NAME")

Dim intPageNow
intPageNow = request.QueryString("page")

Dim intPageSize, strPageInfo
intPageSize = 30

Dim arrRecordInfo, i
Dim Conn
f__OpenConn
  Dim clsRecordInfo
  Set clsRecordInfo = New Cls_PageView

  clsRecordInfo.strTableName = "[myTable]"
  clsRecordInfo.strPageUrl = strLocalUrl
  clsRecordInfo.strFieldsList = "[ID], [Title], [LastTime]"
  clsRecordInfo.strCondiction = "[ID] < 10000"
  clsRecordInfo.strOrderList = "[ID] ASC"
  clsRecordInfo.strPrimaryKey = "[ID]"
  clsRecordInfo.intPageSize = 20
  clsRecordInfo.intPageNow = intPageNow

  clsRecordInfo.strCookiesName = "RecordCount"
  clsRecordInfo.strPageVar = "page"

  clsRecordInfo.intRefresh = 0
  clsRecordInfo.objConn = Conn
  clsRecordInfo.InitClass

  arrRecordInfo = clsRecordInfo.arrRecordInfo
  strPageInfo = clsRecordInfo.strPageInfo
  Set clsRecordInfo = nothing
f__CloseConn
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>分页测试</title>
<style type="text/css">

</style>
<style type="text/css">

</style>
</head>
<body>
<table width="100%" border="0" cellspacing="0" cellpadding="4">
  <tr>
  <td> <%= strPageInfo%></td>
</tr>
</table>
<div class="PageView">
  <table width="100%" border="0" cellspacing="0" cellpadding="4">
    <tr class="Header">
    <td>ID</td>
    <td>描述</td>
    <td>日期</td>
  </tr>
<%
  If IsArray(arrRecordInfo) Then
   For i = 0 to UBound(arrRecordInfo, 2)
%>
  <tr>
    <td> <%= arrRecordInfo(0, i)%></td>
    <td> <%= arrRecordInfo(1, i)%></td>
    <td> <%= arrRecordInfo(2, i)%></td>
  </tr>
<%
   Next
  End If
%>
</table>
</div>
<table width="100%" border="0" cellspacing="0" cellpadding="4">
  <tr>
  <td> <%= strPageInfo%></td>
</tr>
</table>
<table width="100%" border="0" cellspacing="0" cellpadding="4">
  <tr>
    <td align="center"> <%= getTimeOver(1)%></td>
  </tr>
</table>
</body>
</html>

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