asp.net Repeater 百萬級分頁
开发平台是2003，所用控件是Repeater
using System;
using System.Data;
using System.Data.SqlClient;
namespace Pagination.Class
{
/// <summary>
/// Pager 的摘要说明。
/// </summary>
public class Pager
{
public Pager()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
/// <param name="fieldlist"></param>字段列表，如id,title,content
/// <param name="condition"></param>条件，如id<100
/// <param name="pkey"></param>主键，自增
/// <param name="tablename"></param>表的名字，如News
/// <param name="sort"></param>排序，0表示降序，1表示升序
/// <param name="pagesize"></param>每页大小
/// <param name="cpage"></param>当前页码
public DataSet GetCurrentDataSet(string fieldlist,string condition,string pkey,string tablename,int sort,int pagesize,int cpage)//得到当前页记录
{
SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["cs"]);
SqlDataAdapter cmd=new SqlDataAdapter(GetSql(fieldlist,condition,pkey,tablename,sort,pagesize,cpage),conn);
DataSet ds=new DataSet();
cmd.Fill(ds);
return ds;
}
static string GetSql(string fieldlist,string condition,string pkey,string tablename,int sort,int pagesize,int cpage)
{
string sql="";
if(sort==0)
{
if(condition!="")
{
sql="select top "+pagesize.ToString()+" "+fieldlist+" from "+tablename+" where "+condition+" and "+pkey+" not in(select top "+pagesize*(cpage-1)+" "+pkey+" from "+tablename+" where "+condition+" and order by "+pkey+" desc) order by "+pkey+" desc";
}
else
{
sql="select top "+pagesize.ToString()+" "+fieldlist+" from "+tablename+" where "+pkey+" not in(select top "+pagesize*(cpage-1)+" "+pkey+" from "+tablename+" order by "+pkey+" desc) order by "+pkey+" desc";
}
}
else
{
if(condition!="")
{
sql="select top "+pagesize.ToString()+" "+fieldlist+" from "+tablename+" where "+condition+" and "+pkey+" not in(select top "+pagesize*(cpage-1)+" "+pkey+" from "+tablename+" where "+condition+" and order by "+pkey+" asc) order by "+pkey+" asc";
}
else
{
sql="select top "+pagesize.ToString()+" "+fieldlist+" from "+tablename+" where "+pkey+" not in(select top "+pagesize*(cpage-1)+" "+pkey+" from "+tablename+" order by "+pkey+" asc) order by "+pkey+" asc";
}
}
return sql;
}
public int GetCounts(string pkey,string tablename,string condition)//得到总记录数
{
string sql;
if(condition!="")
{
sql="select count("+pkey+") from "+tablename;
}
else
{
sql="select count("+pkey+") from "+tablename;
}
SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["cs"]);
SqlCommand cmd=new SqlCommand(sql,conn);
conn.Open();
SqlDataReader dr=cmd.ExecuteReader(CommandBehavior.CloseConnection);
dr.Read();
string str=dr[0].ToString();
dr.Close();
return Convert.ToInt32(str);
}
}
}
这里可以输出总记录数和当前页面的dataset。
针对此通用分页类的调用实例
1 建表News
CREATE TABLE [News] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[title] [nvarchar] (100) COLLATE Chinese_PRC_CI_AS NULL ,
[content] [text] COLLATE Chinese_PRC_CI_AS NULL ,
CONSTRAINT [PK_News] PRIMARY KEY CLUSTERED
(
[id]
) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
2 建立生成数据的存储过程
create proc addnews
@count int
as
declare @i int
set @i=0
set nocount on
while @i<@count
begin
set @i=@i+1
insert into news (title,content) values ('百万级数据分页测试','Test by 逐日★风')
end
set nocount off
GO
3 生成数据
addnews 2000000
4 建立Aspx文件
<asp:Repeater id="Repeater1" runat="server">
<HeaderTemplate>
<table width="800" border="1" cellpadding="3">
</HeaderTemplate>
<ItemTemplate>
<tr>
<td><%#DataBinder.Eval(Container.DataItem,"id")%></td>
<td><%#DataBinder.Eval(Container.DataItem,"title")%></td>
<td><%#DataBinder.Eval(Container.DataItem,"content")%></td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
</asp:Repeater>
<div align="center"><FONT face="宋体">共</FONT>
<asp:Label id="lblcount" runat="server"></asp:Label><FONT face="宋体">条记录，当前
<asp:Label id="lblcurrent" runat="server"></asp:Label>页
<asp:LinkButton id="hlprev" runat="server">上页</asp:LinkButton>
<asp:LinkButton id="hlnext" runat="server">下页</asp:LinkButton>
<asp:DropDownList id="DropDownList1" runat="server" AutoPostBack="True"></asp:DropDownList></FONT></div>
5 Cs文件
protected System.Web.UI.WebControls.Label lblcount;
protected System.Web.UI.WebControls.Label lblcurrent;
protected System.Web.UI.WebControls.DropDownList DropDownList1;
protected System.Web.UI.WebControls.LinkButton hlprev;
protected System.Web.UI.WebControls.LinkButton hlnext;
protected System.Web.UI.WebControls.Repeater Repeater1;
private int pagesize=20;
static int cpage;
static int TotalPages;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!this.IsPostBack)
{
cpage=1;
Class.Pager pg=new Class.Pager();
int Counts=pg.GetCounts("id","News","");
lblcount.Text=Counts.ToString();//得到总记录数
TotalPages=Counts/pagesize;
if(Counts<pagesize)
TotalPages=1;
else
{
if(Counts%pagesize!=0)TotalPages++;
}//计算总页数
lblcurrent.Text=cpage.ToString()+"/"+TotalPages;
DataSet ds=new DataSet();
ds=pg.GetCurrentDataSet("id,title,content","","id","News",1,10,cpage);
bind(ds);
Gethl();
Getddlist();
}
}
private void Getddlist()
{
if(TotalPages!=1)
{
for(int i=1;i<=TotalPages;i++)
{
DropDownList1.Items.Add(new ListItem(i.ToString(),i.ToString()));
}
}
else
{
DropDownList1.Items.Add(new ListItem("1","1"));
}
}
private void Gethl()//得到上页，下页状态
{
if(lblcurrent.Text=="1")
{
hlprev.Enabled=false;
hlnext.Enabled=false;
}
else
{
if(cpage==1)
hlprev.Enabled=false;
else
hlprev.Enabled=true;
if(cpage==Convert.ToInt32(TotalPages))
hlnext.Enabled=false;
else
hlnext.Enabled=true;
}
lblcurrent.Text=cpage.ToString()+"/"+TotalPages;
}
private void bind(DataSet ds)
{
Repeater1.DataSource=ds;
Repeater1.DataBind();
}
#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.hlprev.Click += new System.EventHandler(this.hlprev_Click);
this.hlnext.Click += new System.EventHandler(this.hlnext_Click);
this.DropDownList1.SelectedIndexChanged += new System.EventHandler(this.DropDownList1_SelectedIndexChanged);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void hlprev_Click(object sender, System.EventArgs e)
{
cpage=cpage-1;
Class.Pager pg=new Class.Pager();
DataSet ds=new DataSet();
ds=pg.GetCurrentDataSet("id,title,content","","id","News",cpage,10,cpage);
bind(ds);
Gethl();
DropDownList1.ClearSelection();
DropDownList1.Items.FindByValue(cpage.ToString()).Selected=true;
}
private void hlnext_Click(object sender, System.EventArgs e)
{
cpage=cpage+1;
Class.Pager pg=new Class.Pager();
DataSet ds=new DataSet();
ds=pg.GetCurrentDataSet("id,title,content","","id","News",cpage,10,cpage);
bind(ds);
Gethl();
DropDownList1.ClearSelection();
DropDownList1.Items.FindByValue(cpage.ToString()).Selected=true;
}
private void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
{
cpage=Convert.ToInt32(DropDownList1.SelectedValue);
Class.Pager pg=new Class.Pager();
DataSet ds=new DataSet();
ds=pg.GetCurrentDataSet("id,title,content","","id","News",cpage,10,cpage);
bind(ds);
Gethl();
}
本人机器Pentium M1.7G 480MDDRM ,可用物理内存70MB左右。200W数据平均分页时间0.5秒左右。
