Access2000数据库80万记录通用快速分页类

2022-07-15 80酷酷网 80kuku.com

　　access|分页|数据|数据库刚用的，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)