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access下的分页方案

 2006-06-29 17:11:16 来源:WEB开发网   
核心提示:具体不多说了,只贴出相关源码~using System;using System.Collections.Generic;using System.Text;using System.Data;using System.Data.OleDb;using System.Web;/** <summary>///

具体不多说了,只贴出相关源码~

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

/**//// <summary>
/// 名称:access下的分页方案(仿sql存储过程)
/// 作者:cncxz(虫虫)
/// 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>
   /// 打开连接
   /// </summary>
   public void ConnOpen()
   {
     if (m_Conn.State != ConnectionState.Open)
       m_Conn.Open();
   }
   /**//// <summary>
   /// 关闭连接
   /// </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>
   /// 获取当前页应该显示的记录,注意:查询中必须包含名为ID的自动编号列,若不符合你的要求,就修改一下源码吧 :)
   /// </summary>
   /// <param name="pageIndex">当前页码</param>
   /// <param name="pageSize">分页容量</param>
   /// <param name="showString">显示的字段</param>
   /// <param name="queryString">查询字符串,支持联合查询</param>
   /// <param name="whereString">查询条件,若有条件限制则必须以where 开头</param>
   /// <param name="orderString">排序规则</param>
   /// <param name="pageCount">传出参数:总页数统计</param>
   /// <param name="recordCount">传出参数:总记录统计</param>
   /// <returns>装载记录的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)//第一页
     {
       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)//超出总页数
     {
       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;
   }
}

还有调用示例:
html代码
<%@ 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>分页演示</title>
</head>
<body>
   <form id="form1" runat="server">
   <div>
     <br />
       转到第<asp:TextBox ID="txtPageSize" runat="server" Width="29px">1</asp:TextBox>页<asp:Button ID="btnJump" runat="server" Text="Go" /><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代码
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}条记录,每页{1}条,页次{2}/{3}",recordCount,pageSize,pageIndex,pageCount);
   }
  
 
   protected void btnJump_Click(object sender, EventArgs e)
   {
     int.TryParse(txtPageSize.Text, out pageIndex);
     LoadData();
   }
}


最后附上工程文件下载地址:http://www.cnblogs.com/Files/cncxz/AdoPager.rar

http://cncxz.cnblogs.com/archive/2006/06/28/438050.html

Tags:access 方案

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