首先创建一张表(要求ID自动编号)：create table redheadedfile(id int identity(1,1),filenames nvarchar(20),senduser nvarchar(20),primary key(id))然后我们写入50万条记录：declare @i intset @i=1while @i<=500000begin insert into redheadedfile(filenames,senduser) values('我的分页算法','陆俊铭') set @i=@i+1endGO用Microsoft Visual Studio .NET 2003创建一张WebForm网页(本人起名webform8.aspx)前台代码片段如下(webform8.aspx)：<%@ Page language="c#" Codebehind="WebForm8.aspx.cs" AutoEventWireup="false" Inherits="WebApplication6.WebForm8" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ><HTML> <HEAD> <title>WebForm8</title> <meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR"> <meta content="C#" name="CODE_LANGUAGE"> <meta content="JavaScript" name="vs_defaultClientScript"> <meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <asp:datalist id="datalist1" AlternatingItemStyle-BackColor="#f3f3f3" Width="100%" CellSpacing="0" CellPadding="0" Runat="server"> <ItemTemplate> <table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="30%"
align="center"><%#DataBinder.Eval(Container.DataItem,"filenames")%></td> <td width="30%"
align="center"><%#DataBinder.Eval(Container.DataItem,"senduser")%></td> <td width="30%"
align="center"><%#DataBinder.Eval(Container.DataItem,"id")%></td> </tr> </table> </ItemTemplate> </asp:datalist> <div align="center">共<asp:label id="LPageCount" Runat="server" ForeColor="#ff0000"></asp:label>页/共
<asp:label id="LRecordCount" Runat="server" ForeColor="#ff0000"></asp:label>记录 <asp:linkbutton id="Fistpage" Runat="server"
CommandName="0">首页</asp:linkbutton> <asp:linkbutton id="Prevpage" Runat="server" CommandName="prev">
上一页</asp:linkbutton> <asp:linkbutton id="Nextpage" Runat="server"
CommandName="next">下一页</asp:linkbutton> <asp:linkbutton id="Lastpage" Runat="server"
CommandName="last">尾页</asp:linkbutton> 当前第<asp:label id="LCurrentPage" Runat="server"
ForeColor="#ff0000"></asp:label>页 跳页<asp:TextBox ID="gotoPage" Runat="server" Width="30px"
MaxLength="5" AutoPostBack="True"></asp:TextBox></div> </form> </body></HTML>后台代码片段如下(webform8.aspx.cs)using System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Data.SqlClient;using System.Configuration;
namespace WebApplication6{ /// <summary> /// WebForm8 的摘要说明。 /// </summary> public class WebForm8 : System.Web.UI.Page { protected System.Web.UI.WebControls.LinkButton Fistpage; protected System.Web.UI.WebControls.LinkButton Prevpage; protected System.Web.UI.WebControls.LinkButton Nextpage; protected System.Web.UI.WebControls.LinkButton Lastpage; protected System.Web.UI.WebControls.DataList datalist1; protected System.Web.UI.WebControls.DropDownList mydroplist; protected System.Web.UI.WebControls.Label LPageCount; protected System.Web.UI.WebControls.Label LRecordCount; protected System.Web.UI.WebControls.Label LCurrentPage; protected System.Web.UI.WebControls.TextBox gotoPage; const int PageSize=20;//定义每页显示记录 int PageCount,RecCount,CurrentPage,Pages,JumpPage;//定义几个保存分页参数变量 private void Page_Load(object sender, System.EventArgs e) { if(!IsPostBack) { RecCount = Calc();//通过Calc()函数获取总记录数 PageCount = RecCount/PageSize + OverPage();//计算总页数（加上OverPage()函数防止有余数造成显示
数据不完整）
ViewState["PageCounts"] = RecCount/PageSize -
ModPage();//保存总页参数到ViewState（减去ModPage()函数防止SQL语句执行时溢出查询范围，可以用存储过程分页算法来理解这句） ViewState["PageIndex"] = 0;//保存一个为0的页面索引值到ViewState ViewState["JumpPages"] = PageCount;//保存PageCount到ViewState，跳页时判断用户输入数是否超出页
码范围 //显示LPageCount、LRecordCount的状态 LPageCount.Text = PageCount.ToString(); LRecordCount.Text = RecCount.ToString(); //判断跳页文本框失效 if(RecCount <= 20) gotoPage.Enabled = false; TDataBind();//调用数据绑定函数TDataBind()进行数据绑定运算 } } //计算余页 public int OverPage() { int pages = 0; if(RecCount%PageSize != 0) pages = 1; else pages = 0; return pages; } //计算余页，防止SQL语句执行时溢出查询范围 public int ModPage() { int pages = 0; if(RecCount%PageSize == 0 && RecCount != 0) pages = 1; else pages = 0; return pages; } /* *计算总记录的静态函数 *本人在这里使用静态函数的理由是：如果引用的是静态数据或静态函数，连接器会优化生成代码，去掉动态重定位项（对
海量数据表分页效果更明显）。 *希望大家给予意见、如有不正确的地方望指正。 */ public static int Calc() { int RecordCount = 0; SqlCommand MyCmd = new SqlCommand("select count(*) as co from redheadedfile",MyCon()); SqlDataReader dr = MyCmd.ExecuteReader(); if(dr.Read()) RecordCount = Int32.Parse(dr["co"].ToString()); MyCmd.Connection.Close(); return RecordCount; } //数据库连接语句（从Web.Config中获取） public static SqlConnection MyCon() { SqlConnection MyConnection = new SqlConnection(ConfigurationSettings.AppSettings["DSN"]); MyConnection.Open(); return MyConnection; } //对四个按钮（首页、上一页、下一页、尾页）返回的CommandName值进行操作 private void Page_OnClick(object sender, CommandEventArgs e) { CurrentPage = (int)ViewState["PageIndex"];//从ViewState中读取页码值保存到CurrentPage变量中进行参数运
算 Pages = (int)ViewState["PageCounts"];//从ViewState中读取总页参数运算
string cmd = e.CommandName; switch(cmd)//筛选CommandName { case "next": CurrentPage++; break; case "prev": CurrentPage--; break; case "last": CurrentPage = Pages; break; default: CurrentPage = 0; break; } ViewState["PageIndex"] = CurrentPage;//将运算后的CurrentPage变量再次保存至ViewState TDataBind();//调用数据绑定函数TDataBind() }
private void TDataBind() { CurrentPage = (int)ViewState["PageIndex"];//从ViewState中读取页码值保存到CurrentPage变量中进行按钮失
效运算 Pages = (int)ViewState["PageCounts"];//从ViewState中读取总页参数进行按钮失效运算 //判断四个按钮（首页、上一页、下一页、尾页）状态 if (CurrentPage + 1 > 1) { Fistpage.Enabled = true; Prevpage.Enabled = true; } else { Fistpage.Enabled = false; Prevpage.Enabled = false; } if (CurrentPage == Pages) { Nextpage.Enabled = false; Lastpage.Enabled = false; } else { Nextpage.Enabled = true; Lastpage.Enabled = true; } //数据绑定到DataList控件 DataSet ds = new DataSet(); //核心SQL语句，进行查询运算（决定了分页的效率:)） SqlDataAdapter MyAdapter = new SqlDataAdapter("Select Top "+PageSize+" * from redheadedfile where id
not in(select top "+PageSize*CurrentPage+" id from redheadedfile order by id asc) order by id asc",MyCon()); MyAdapter.Fill(ds,"news"); datalist1.DataSource = ds.Tables["news"].DefaultView; datalist1.DataBind(); //显示Label控件LCurrentPaget和文本框控件gotoPage状态 LCurrentPage.Text = (CurrentPage+1).ToString(); gotoPage.Text = (CurrentPage+1).ToString(); //释放SqlDataAdapter MyAdapter.Dispose(); }
#region Web 窗体设计器生成的代码 override protected void OnInit(EventArgs e) { // // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。 // InitializeComponent(); base.OnInit(e); } /// <summary> /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// </summary> private void InitializeComponent() { this.Fistpage.Command += new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick); this.Prevpage.Command += new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick); this.Nextpage.Command += new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick); this.Lastpage.Command += new System.Web.UI.WebControls.CommandEventHandler(this.Page_OnClick); this.gotoPage.TextChanged += new System.EventHandler(this.gotoPage_TextChanged); this.Load += new System.EventHandler(this.Page_Load);
} #endregion //跳页代码 private void gotoPage_TextChanged(object sender, System.EventArgs e) { try { JumpPage = (int)ViewState["JumpPages"];//从ViewState中读取可用页数值保存到JumpPage变量中 //判断用户输入值是否超过可用页数范围值 if(Int32.Parse(gotoPage.Text) > JumpPage || Int32.Parse(gotoPage.Text) <= 0)
Response.Write("<script>alert('页码范围越界！');location.href='WebForm8.aspx'</script>"); else { int InputPage = Int32.Parse(gotoPage.Text.ToString()) - 1;//转换用户输入值保存在int型
InputPage变量中 ViewState["PageIndex"] = InputPage;//写入InputPage值到ViewState["PageIndex"]中 TDataBind();//调用数据绑定函数TDataBind()再次进行数据绑定运算 } } //捕获由用户输入不正确数据类型时造成的异常 catch(Exception exp) { Response.Write("<script>alert('"+exp.Message+"');location.href='WebForm8.aspx'</script>"); } } }}
转载于:https://www.cnblogs.com/antony1029/archive/2005/12/03/290128.html
相关资源：JAVA上百实例源码以及开源项目