using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.OleDb;
using System.Web;

/** <summary>
/// 名稱：access下的分頁方案（仿sql存儲過程）
/// 作者：cncxz(蟲蟲)
/// blog：http://cncxz.cnblogs.com
/// </summary>
public class AdoPager
{
??? protected string m_ConnString;
??? protected OleDbConnection m_Conn;

??? public AdoPager()
??? {
??????? CreateConn(string.Empty);
??? }
??? public AdoPager(string dbPath)
??? {
??????? CreateConn(dbPath);
??? }

??? private void CreateConn(string dbPath)
??? {
??????? if (string.IsNullOrEmpty(dbPath))
??????? {
??????????? string str = System.Configuration.ConfigurationManager.AppSettings["dbPath"] as string;
??????????? if (string.IsNullOrEmpty(str))
??????????????? str = "~/App_Data/db.mdb";
??????????? m_ConnString = string.Format(@"Provider=Microsoft.Jet.OLEDB.4.0;Data source={0}", HttpContext.Current.Server.MapPath(str));
??????? }
??????? else
??????????? m_ConnString = string.Format(@"Provider=Microsoft.Jet.OLEDB.4.0;Data source={0}", dbPath);

??????? m_Conn = new OleDbConnection(m_ConnString);
??? }
??? /** <summary>
??? /// 打開連接
??? /// </summary>
??? public void ConnOpen()
??? {
??????? if (m_Conn.State != ConnectionState.Open)
??????????? m_Conn.Open();
??? }
??? /** <summary>
??? /// 關閉連接
??? /// </summary>
??? public void ConnClose()
??? {
??????? if (m_Conn.State != ConnectionState.Closed)
??????????? m_Conn.Close();
??? }

??? private string recordID(string query, int passCount)
??? {
??????? OleDbCommand cmd = new OleDbCommand(query, m_Conn);
??????? string result = string.Empty;
??????? using (IDataReader dr = cmd.ExecuteReader())
??????? {
??????????? while (dr.Read())
??????????? {
??????????????? if (passCount < 1)
??????????????? {
??????????????????? result += "," + dr.GetInt32(0);
??????????????? }
??????????????? passCount--;
??????????? }
??????? }
??????? return result.Substring(1);
??? }

??? /** <summary>
??? /// 獲取當前頁應該顯示的記錄，注意：查詢中必須包含名為ID的自動編號列，若不符合你的要求，就修改一下源碼吧 :)
??? /// </summary>
??? /// <param name="pageIndex">當前頁碼</param>
??? /// <param name="pageSize">分頁容量</param>
??? /// <param name="showString">顯示的字段</param>
??? /// <param name="queryString">查詢字符串，支持聯合查詢</param>
??? /// <param name="whereString">查詢條件，若有條件限制則必須以where 開頭</param>
??? /// <param name="orderString">排序規則</param>
??? /// <param name="pageCount">傳出參數：總頁數統計</param>
??? /// <param name="recordCount">傳出參數：總記錄統計</param>
??? /// <returns>裝載記錄的DataTable</returns>
??? public DataTable ExecutePager(int pageIndex, int pageSize, string showString, string queryString, string whereString, string orderString, out int pageCount, out int recordCount)
??? {
??????? if (pageIndex < 1) pageIndex = 1;
??????? if (pageSize < 1) pageSize = 10;
??????? if (string.IsNullOrEmpty(showString)) showString = "*";
??????? if (string.IsNullOrEmpty(orderString)) orderString = "ID desc";
??????? ConnOpen();
??????? string myVw = string.Format(" ( {0} ) tempVw ", queryString);
??????? OleDbCommand cmdCount = new OleDbCommand(string.Format(" select count(0) as recordCount from {0} {1}", myVw, whereString), m_Conn);

??????? recordCount = Convert.ToInt32(cmdCount.ExecuteScalar());

??????? if ((recordCount % pageSize) > 0)
??????????? pageCount = recordCount / pageSize + 1;
??????? else
??????????? pageCount = recordCount / pageSize;
??????? OleDbCommand cmdRecord;
??????? if (pageIndex == 1)//第一頁
??????? {
??????????? cmdRecord = new OleDbCommand(string.Format("select top {0} {1} from {2} {3} order by {4} ", pageSize, showString, myVw, whereString, orderString), m_Conn);
??????? }
??????? else if (pageIndex > pageCount)//超出總頁數
??????? {
??????????? cmdRecord = new OleDbCommand(string.Format("select top {0} {1} from {2} {3} order by {4} ", pageSize, showString, myVw, "where 1=2", orderString), m_Conn);
??????? }
??????? else
??????? {
??????????? int pageLowerBound = pageSize * pageIndex;
??????????? int pageUpperBound = pageLowerBound - pageSize;
??????????? string recordIDs = recordID(string.Format("select top {0} {1} from {2} {3} order by {4} ", pageLowerBound, "ID", myVw, whereString, orderString), pageUpperBound);
??????????? cmdRecord = new OleDbCommand(string.Format("select {0} from {1} where id in ({2}) order by {3} ", showString, myVw, recordIDs, orderString), m_Conn);

??????? }
??????? OleDbDataAdapter dataAdapter = new OleDbDataAdapter(cmdRecord);
??????? DataTable dt=new DataTable();
??????? dataAdapter.Fill(dt);
??????? ConnClose();
??????? return dt;
??? }
}

還有調用示例：html代碼

<%@ Page Language="C#" AutoEventWireup="true"? CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
??? <title>分頁演示</title>
</head>
<body>
??? <form id="form1" runat="server">
??? <div>
??????? <br />
??????? &nbsp; 轉到第<asp:TextBox ID="txtPageSize" runat="server" Width="29px">1</asp:TextBox>頁<asp:Button ID="btnJump" runat="server" Text="Go" OnClick="btnJump_Click" /><br />
??????? <asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333" GridLines="None" Width="90%">
??????????? <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
??????????? <RowStyle BackColor="#EFF3FB" />
??????????? <EditRowStyle BackColor="#2461BF" />
??????????? <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
??????????? <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
??????????? <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
??????????? <AlternatingRowStyle BackColor="White" />
??????? </asp:GridView>
???
??? </div>
??????? <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
??? </form>
</body>
</html>

示例的codebehind代碼

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections.Generic;

public partial class _Default : System.Web.UI.Page
{
??? private AdoPager mm_Pager;
??? protected AdoPager m_Pager
??? {
??????? get{
??????????? if (mm_Pager == null)
??????????????? mm_Pager = new AdoPager();
??????????? return mm_Pager;
??????? }
??? }
??? protected void Page_Load(object sender, EventArgs e)
??? {
??????? if(!IsPostBack)
??????????? LoadData();
??? }
??? private int pageIndex = 1;
??? private int pageSize = 20;
??? private int pageCount = -1;
??? private int recordCount = -1;

??? private void LoadData()
??? {
??????? string strQuery = "select a.*,b.KindText from tableTest a left join tableKind b on a.KindCode=b.KindCode ";
??????? string strShow = "ID,Subject,KindCode,KindText";????
???????
??????? DataTable dt = m_Pager.ExecutePager(pageIndex, pageSize, strShow, strQuery, "", "ID desc", out pageCount, out recordCount);
??????? GridView1.DataSource = dt;
??????? GridView1.DataBind();
??????? Label1.Text = string.Format("共{0}條記錄，每頁{1}條，頁次{2}/{3}",recordCount,pageSize,pageIndex,pageCount);
??? }
???
??
??? protected void btnJump_Click(object sender, EventArgs e)
??? {
??????? int.TryParse(txtPageSize.Text, out pageIndex);
??????? LoadData();
??? }
}

轉載于:https://www.cnblogs.com/Sue_/articles/1820744.html

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