分页这个也是最多人问的，也是很基础很实用的。
网上有很多分页代码,要不是有前台就没后台,要不是有后台没前台,要不是就是控件,要不就是一大堆SQL代码，让人不知道怎样用。
力求最简单最易懂.三层架构那些就不搞了。自己下载一个
如果是access 就用这个SQLHELPER [URL=http://hi.csdn.net/link.php?url=http://blog.csdn.net/zzxap]http://hi.csdn.net/link.php?url=http://blog.csdn.net/zzxap[/URL]
如果是MSSQL 就用这个sqlhelper [URL=http://www.cnblogs.com/zzxap/archive/2009/11/05/1596773.html]http://www.cnblogs.com/zzxap/archive/2009/11/05/1596773.html[/URL]
承接外包,网站开发 zzxap@hotmail.com
[code=HTML]
前台 如果你用的是 gridview 就把Repeater替换成gridview 。一样的。。
<form id="frm01" action="" method="post" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<div id="center-top" > <div class="fon">中间1</div> </div>
<div id="center-content_Default2" >
<asp:Repeater runat="server" Id="mainlist" >
<ItemTemplate>
<div id="pic-out" >
<li class="pic-a" > Eval("product_type").ToString() </li>
<li class="pic-b" >Eval("product_desc").ToString() </li>
<li>价格<%#Eval("price")%> </li>
</div>
</ItemTemplate>
</asp:Repeater>
</div>
<div style="PADDING-TOP:10px; text-align:center" >
共<asp:label id="LPageCount" ForeColor="#ff0000" Runat="server"></asp:label>頁
<asp:label id="LTotalCount" ForeColor="#ff0000" Runat="server"></asp:label>條記錄
<asp:linkbutton id="Fistpage" Runat="server" CommandName="0" OnClick="Pager_Click">首頁</asp:linkbutton>
<asp:linkbutton id="Prevpage" Runat="server" CommandName="prev" OnClick="Pager_Click">上一頁</asp:linkbutton>
<asp:linkbutton id="Nextpage" Runat="server" CommandName="next" OnClick="Pager_Click">下一頁</asp:linkbutton>
<asp:linkbutton id="Lastpage" Runat="server" CommandName="last" OnClick="Pager_Click">尾頁</asp:linkbutton>當前第
<asp:label id="LCurrentPage" ForeColor="#ff0000" Runat="server"></asp:label>頁
轉到第
<asp:textbox id="gotoPage" Width="30px" Runat="server" AutoPostBack="True" MaxLength="5" ></asp:textbox>頁
<asp:Label style=" POSITION: absolute" id="msgbox" runat="server" ForeColor="Red" BorderColor="Red"></asp:Label>
</div>
</ContentTemplate>
</asp:UpdatePanel>
</form>
[/code]
[code=C#]
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.Data.OleDb;
using System.Text;
using Microsoft.ApplicationBlocks.Data;
public partial class _Default : System.Web.UI.Page
{
string strpage = "";
int PageCount = 0;
int RecCount = 0;
int CurrentPage = 0;
int Current = 0;
int Pages = 0;
int JumpPage = 0;//跳到第几页
//每页显示记录数
int PageSize =20; //每页显示20条记录
string product_type = "";
string type = "";
string headid = "";
private static int PageIndex=1;
private static int PageCounts=1;
private static int JumpPages=1;
protected void Page_Load(object sender, EventArgs e)
{
#region 接收从查询页面传递过来的参数。
if (Request.QueryString["product_type"]!=null)
{
product_type = Server.UrlDecode(Request.QueryString["product_type"].ToString());
}
if (Request.QueryString["type"]!=null)
{
type = Server.UrlDecode(Request.QueryString["type"].ToString());
}
#endregion
// headid = Request.QueryString["headid"];
if (!IsPostBack)
{
//-------------------------------------------------------------
RecCount = Calc();
//计算总记录数
PageCount = RecCount / PageSize + OverPage();
//计算总页数
PageCounts = RecCount / PageSize - ModPage();
if (!string.IsNullOrEmpty(strpage))
{
//设置当前页为返回页
PageIndex= int.Parse(strpage);
}
else
{
PageIndex= 1;
//设置当前页为11
//Session["CurPage"] = 1;
}
JumpPages = PageCount;
LPageCount.Text = PageCount.ToString();
//总页数
LTotalCount.Text = RecCount.ToString();
//总记录数
if (RecCount <= PageSize)
{
gotoPage.Enabled = false;
}
else
{
gotoPage.Enabled = true;
}
//-------------------------------------------------------------
GetMainData(); //绑定数据
}
}
#region "計算總行數"
public int OverPage()
{
//算余
int pages = 0;
if (RecCount % PageSize != 0) {
pages = 1;
}
else {
pages = 0;
}
return pages;
}
public int ModPage()
{
//算余
int pages = 0;
if (RecCount % PageSize == 0 && RecCount != 0)
{
pages = 1;
}
else {
pages = 0;
}
return pages;
}
public int Calc()
{
//計算記錄總數
DataSet ds= new DataSet();
StringBuilder ass = new StringBuilder("Select count(id) from M_product where 1=1 ");
//如果有查询参数传入，就计算查询结果的总数
if (type != null && type != "")
{
ass.Append(" and [type]=" + type.Replace("'", "") + " ");
}
if (product_type != null && product_type != "")
{
ass.Append(" and product_type=" + product_type.Replace("'", "") + " ");
}
string bss = ass.ToString();
int RecordCount = 0;
ds = SqlHelper.ExecuteDataset(SqlHelper.Conn, CommandType.Text, bss);
RecordCount = Int32.Parse(ds.Tables[0].Rows[0][0].ToString());
//RecordCount = 10;
if (RecordCount < PageSize)
{
Fistpage.Enabled = false;
Prevpage.Enabled = false;
Nextpage.Enabled = false;
Lastpage.Enabled = false;
}
else
{
Fistpage.Enabled = true;
Prevpage.Enabled = true;
Nextpage.Enabled = true;
Lastpage.Enabled = true;
}
return RecordCount;
}
#endregion
#region "翻頁"
public void Pager_Click(object sender, EventArgs e)
{
CurrentPage = (int)PageIndex;
Pages = (int)PageCounts;
string arg = ((LinkButton)sender).CommandName.ToString();
switch (arg) {
case "next":
//下一页 如果要支持URL分页。 只要把CurrentPage 从URL获取就可以了
if (CurrentPage < Pages + 1)
{ CurrentPage = CurrentPage + 1; }
break;
case "prev":
//上一页
if (CurrentPage != 1)
{ CurrentPage -= 1; }
break;
case "last":
//最后一页
CurrentPage = Pages + 1;
break;
default:
//首页
CurrentPage = 1;
break;
}
//根据页数控制翻页按钮的可用与否
if (CurrentPage > 1) {
Fistpage.Enabled = true;
Prevpage.Enabled = true;
}
else {
Fistpage.Enabled = false;
Prevpage.Enabled = false;
}
if (CurrentPage == Pages + 1)
{
Nextpage.Enabled = false;
Lastpage.Enabled = false;
}
else {
Nextpage.Enabled = true;
Lastpage.Enabled = true;
}
PageIndex= CurrentPage;
//获取改變后的页码
// //Session["CurPage"] = CurrentPage;
//用户返回到当前页
GetMainData();
}
//转到第几页
protected void gotoPage_TextChanged(object sender, System.EventArgs e)
{
string asd = this.gotoPage.Text.Trim().ToString();
JumpPage = (int)JumpPages;
if (string.IsNullOrEmpty(asd)) {
Alert("out of page range");
return;
}
if (Int32.Parse(gotoPage.Text) > JumpPage || Int32.Parse(gotoPage.Text) <= 0 || string.IsNullOrEmpty(asd))
{
Alert("out of page range");//页数超出范围
return;
}
else {
int InputPage = Int32.Parse(gotoPage.Text.ToString());
PageIndex= InputPage;
////Session["CurPage"] = InputPage;
GetMainData();//绑定数据集
}
}
#endregion
public void Alert(string rtt)
{
//顯示提示信息
// System.Web.UI.ScriptManager.RegisterClientScriptBlock(UpdatePanel1, this.GetType(), "AjaxMsgBox", "alert('" + rtt + "');", true);
}
private void GetMainData()
{
CurrentPage = (int)PageIndex;//获取当前页
Pages = (int)PageCounts;//获取总页数
LCurrentPage.Text = CurrentPage.ToString();
int PageSize2 = PageSize * (CurrentPage - 1)+1;
if (type != null && product_type!=null)//如果是手机
{
//用于函数参数的个数不对 在查询表达式 'isnull(max(xx.id),0)' 中。
// SELECT 子句中包含一个保留字、拼写错误或丢失的参数，或标点符号不正确。
//分页的核心语句，决定性能 row_number()也不错。也可以将以下语句改为存储过程。
StringBuilder sql = new StringBuilder("select top " + PageSize + " * from M_product a ");
sql.Append(" where a.[id]>( select max(xx.[id]) from ( select TOP " + PageSize2 + " [id] from M_product where 1=1 ");
if (type != null && type != "")
{
sql.Append(" and [type]=" + type.Replace("'", "")+"");
}
if (product_type != null && product_type != "")
{
sql.Append(" and product_type=" + product_type.Replace("'", "") + "");
}
sql.Append(" ORDER BY [id] )xx ) ");
if (type != null && type != "")
{
sql.Append(" and a.[type]=" + type.Replace("'", "") + "");
}
if (product_type != null && product_type != "")
{
sql.Append(" and a.product_type=" + product_type.Replace("'", "") + "");
}
sql.Append(" ORDER BY a.[id] ");
mainlist.DataSource = SqlHelper.ExecuteDataset( SqlHelper.Conn, CommandType.Text,sql.ToString());
mainlist.DataBind();
}
}
}
[/CODE]