优秀的百万级数据分页代码——(忙乎了半天)

  • 来源: 编程中国 作者: 若水   2008-05-12/21:38

  • '----------------------------------------------------------连接数据库
    Response.Buffer = True
    Dim SqlLocalName,SqlUsername,SqlPassword,SqlDatabaseName
    Dim ConnStr,Conn

    '''''''''''''''''''''''''''''' SQL数据库 ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
    SqlLocalName   ="(local)"       '连接IP  [ 本地用 (local) 外地用IP ]
    SqlUsername    ="sa"             '数据库用户名
    SqlPassword    ="XXXXXX"         '用户密码
    SqlDatabaseName="News2008"       '数据库名
    ConnStr = "Provider=Sqloledb;User ID=" & SqlUsername & "; Password=" & SqlPassword & "; Initial Catalog = " & SqlDatabaseName & "; Data Source=" & SqlLocalName & ";"
    '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
    On Error Resume Next
    Set Conn=Server.CreateObject("ADODB.Connection")
    Conn.open ConnStr

    If Err Then
       err.Clear
       Set Conn = Nothing
       Response.Write "<div style='font-size:14px;color=#ff0000' align='center'>数据库连接出错,请检查数据库连接字串</div>"
       Response.End
    End If
    '----------------------------------------------------------连接数据库完成


    '定义变量
    'TblName-表名;FldName-排列字段名;FieldName-需读取的字段名;PageSizeX-分页大小;PageCountX-总页数;PageNo-当前页;OrderType-排序方式;StrWhere-条件语句
    'StrSql-总执行语句;FieldCount-总记录数;StrTmp,StrOrder-临时变量

    Dim TblName,FldName,FieldName,PageSizeX,PageCountX,PageNo,OrderType,StrWhere
    Dim StrSql,FieldCount,StrTmp,StrOrder,TopField

    '进行赋值
    PageNo=trim(Request.Querystring("PageNo"))
    if isnumeric(PageNo) or PageNo="" then  '如果没有Page值,进行初始化值
       PageNo=abs(PageNo)
       if PageNo=0 then PageNo=1
    else
       PageNo=1
    end if

    TblName = "TableNews"
    FldName = "ID"    '说明,排序字段值在数据库不能有重复  :  建议是主键
    FieldName="ID,Title,AddTime"
    PageSizeX=30
    OrderType=1 '0-为降序 1-升序
    StrWhere=" (Code='0101') and (Hits>100) " '注意: 一个条件就用()双括号括起来 第一个不用and

    TopField=(PageNo-1)*PageSizeX  'TOP多少条

    if OrderType=0 then
       StrTmp   = "<(Select min"
       StrOrder = " Order BY ["&FldName&"] desc"
    else
        StrTmp   = ">(Select max"
        StrOrder = " Order BY ["&FldName&"] asc"
    end if

    '定义sql语句
    StrSql="Select Top "&Clng(PageSizeX)&" "& FieldName &" From "&TblName&" "


    if PageNo=1 then  '如果是第一页时,执行如下代码查库速度快
       if StrWhere<>"" then
          StrSql=StrSql&" Where "&StrWhere & StrOrder&""
       else
          StrSql=StrSql & StrOrder
       end if
    else
       if StrWhere<>"" then
          StrSql=StrSql&" Where "& FldName & StrTmp&"("&FldName&") From (Select top "& Clng(TopField)&" "&FldName &" From  "&TblName&" Where "& StrWhere & StrOrder &") as tblTmp) and "& StrWhere & StrOrder&""
       else
          StrSql=StrSql&" Where "& FldName & StrTmp&"("&FldName&") From (Select top "& Clng(TopField)&" "&FldName &" From  "&TblName & StrOrder &") as tblTmp) "&StrOrder&""
       end if
    end if


    Set rs=Conn.exeCute(StrSql) '执行查询

    if rs.bof and rs.eof then
       Conn.Close : set Conn=nothing
       response.write "<script LANGUAGE='javascript'>alert('当前没有找到任何记录,请返回重新操作!');history.go(-1);</script>"
       response.end
    end if

    if StrWhere<>"" then '求总记录数
       FieldCount=Conn.exeCute("Select Count("&FldName&") From "&TblName&" Where "&StrWhere&"")(0)
    else
       FieldCount=Conn.exeCute("Select Count("&FldName&") From "&TblName&"")(0)#p#分页标题#e#
    end if

    if (FieldCount mod nPageSize)>0 then '求总页数 PageCountX
        PageCountX=((FieldCount - (FieldCount mod PageSizeX))/ PageSizeX)+1
    else
        PageCountX= (FieldCount / PageSizeX)
    end if


    '显示数据
    do while not rs.eof
       response.write""&rs("Title")&"&nbsp;&nbsp;&nbsp;添加时间:"&rs("AddTime")&"<br/>"
    rs.movenext
    loop

    '进行关闭和释放相关资源
    rs.Close
    Conn.Close : Set Conn=nothing

    '显示分页
    if PageNo<=1 then
       Response.Write "<font color='#FF0000'>[首页] [上一页]</font>"
    else
       Response.Write"[<a href='?PageNo=1' target='_self' title='首页'><font color='#FF0000'>首页</font></a>] "
       Response.Write"[<a href='?PageNo="&(PageNo-1)&"' target='_self' title='上一页'><font color='#FF0000'>上一页</font></a>] "
    end if

    if PageNo>=PageCountX then
        Response.Write "<font color='#FF0000'>[下一页] [尾页]</font>"
    else
        Response.Write"[<a href='?PageNo="&(PageNo+1)&"'  target='_self' title='下一页'><font color='#FF0000'>下一页</font></a>] "
        Response.Write"[<a href='?PageNo="&PageCountX&"' target='_self' title='尾页'><font color='#FF0000'>尾页</font></a>]"
    end if

    Response.Write"[页次 第<font color=red>"&PageNo&"</font>页/共<font color=red>" & PageCountX &"</font>页]"
    Response.Write" [共<font color=red>"&FieldCount&"</font>条 <font color=red>"& PageSizeX & "</font>条/页]"
    Response.Write" 转到:<select name='page' size='1' onchange=""javascript:window.location = '?PageNo='+this.options[this.selectedIndex].value;"">"

    for i=1 to PageCountX
        Response.Write"<option value="&i&""
        if PageNo=i then Response.Write" selected"
        Response.Write(">第-"&i&"-页</option>")
    next
    Response.Write"</selected>"
    %>

     


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