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Eric的超高效数据分页(图示+代码) ^_^ |
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作者：未知 来源：月光软件站 加入时间：2005-2-28 月光软件站 |
运行截图:
数据表结构:
megaid int IDENTITY (1, 1) NOT NULL PRIMARY KEY CLUSTERED
megaguid char (36) NOT NULL INDEX
数据生成脚本:
 DECLARE @i int
SET @i = 1
WHILE @i < 1000001
BEGIN
INSERT INTO megatable (megaguid) VALUES(NEWID())
SET @i = @i + 1
END
GO
C#代码:
DateTime startTime;
void Page_Init(Object sender, EventArgs e)
   {
 startTime = DateTime.Now;
 }
protected override void Render(HtmlTextWriter writer)
{
base.Render(writer);
Response.Write("本页执行时间: " + (DateTime.Now - startTime));
}
int records = 10000;
int pages = 10;
int pageSize = 15;
SqlConnection conn = new SqlConnection("Server=(local);Database=megadata;User Id=sa;Password=xxx");
void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
  {
dgBind(getSqlString(1));
 }
int firstPage = int.Parse(hidFirstPage.Value);
pnlButtons.Controls.Add(getPager(firstPage));
lblPrompt.Text = "数据提取范围: <B>SELECT TOP " + records.ToString() + " megaid FROM megatable ORDER BY megaguid</B>";
}
string getSqlString(int selectedPage)
{
string[] idsStrArray;
string sqlStr;
if (Session["idStr"] != null)
{
idsStrArray = Session["idStr"].ToString().Split('#');
}
else
{
sqlStr = "SELECT TOP " + records.ToString() + " megaid FROM megatable ORDER BY megaguid";
SqlCommand cmd = new SqlCommand(sqlStr, conn);
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
StringBuilder sb = new StringBuilder("");
int n = 1;
while (dr.Read())
{
if (n % pageSize == 0)
{
sb.Append(dr[0].ToString() + "#");
}
else
{
sb.Append(dr[0].ToString() + ",");
}
n++;
}
dr.Close();
conn.Close();
sb.Remove(sb.Length - 1, 1);
idsStrArray = sb.ToString().Split('#');
Session["idStr"] = sb.ToString();
}
hidPageCount.Value = idsStrArray.Length.ToString();
sqlStr = "SELECT megaid, megaguid FROM megatable WHERE megaid IN (" + idsStrArray[selectedPage - 1] + ") ";
sqlStr += "ORDER BY megaguid";
return sqlStr;
}
Panel getPager(int firstPage)
{
int pageCount = int.Parse(hidPageCount.Value);
Panel pnlPager = new Panel();
pnlPager.Controls.Add(new LiteralControl("<BR> 共" + pageCount.ToString() + "页 "));
pnlPager.Controls.Add(getLinkButton("Fst", "首页", "pgBtn", "1"));
pnlPager.Controls.Add(new LiteralControl(" "));
if (firstPage > 0)
{
pnlPager.Controls.Add(getLinkButton("Pre", "前" + pages.ToString() + "页", "pgBtn", (firstPage - pages + 1).ToString()));
pnlPager.Controls.Add(new LiteralControl(" "));
}
for (int i = firstPage + 1; i < firstPage + pages + 1; i++)
{
if (i > pageCount)
{
break;
}
pnlPager.Controls.Add(getLinkButton(i.ToString(), "[" + i.ToString() + "]", "pgBtn", i.ToString()));
pnlPager.Controls.Add(new LiteralControl(" "));
}
if (firstPage + pages < pageCount)
{
pnlPager.Controls.Add(getLinkButton("Nxt", "后" + pages.ToString() + "页", "pgBtn", (firstPage + pages + 1).ToString()));
pnlPager.Controls.Add(new LiteralControl(" "));
}
pnlPager.Controls.Add(getLinkButton("Lst", "末页", "pgBtn", pageCount.ToString()));
return pnlPager;
}
LinkButton getLinkButton(string lbId, string lbText, string lbCmdName, string lbCmdArg)
{
LinkButton lb = new LinkButton();
lb.ID = lbCmdName + lbId;
lb.Text = lbText;
lb.CommandName = lbCmdName;
lb.CommandArgument = lbCmdArg;
lb.Command += new CommandEventHandler(pageTurn);
return lb;
}
void pageTurn(object sender, CommandEventArgs e)
{
LinkButton lb = (LinkButton)sender;
int selectedPage = int.Parse(lb.CommandArgument);
int firstPage = selectedPage / pages * pages;
firstPage = (selectedPage % pages == 0) ? (firstPage - pages) : firstPage;
hidFirstPage.Value = firstPage.ToString();
dgBind(getSqlString(selectedPage));
pnlButtons.Controls.RemoveAt(pnlButtons.Controls.Count - 1);
pnlButtons.Controls.Add(getPager(firstPage));
lb = (LinkButton)pnlButtons.Controls[pnlButtons.Controls.Count - 1].FindControl("pgBtn" + selectedPage.ToString());
lb.Enabled = false;
}
void dgBind(string sqlStr)
{
SqlDataAdapter da = new SqlDataAdapter(sqlStr, conn);
DataTable dt = new DataTable();
conn.Open();
da.Fill(dt);
conn.Close();
da.Dispose();
dg.DataSource = dt;
dg.DataBind();
}
void dg_ItemDataBound(object sender, DataGridItemEventArgs e)
{
dg.Controls[0].EnableViewState = false;
}
ASPX代码:
<%@ Import Namespace="System.Text" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Data" %>
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<HTML>
<HEAD>
<TITLE>Pager</TITLE>
<SCRIPT runat="server">
//插入上面的C#代码
</SCRIPT>
<STYLE>BODY {}{ FONT-SIZE: 9pt; FONT-FAMILY: Tahoma,宋体; TEXT-ALIGN: center }
TD {}{ FONT-SIZE: 9pt; FONT-FAMILY: Tahoma,宋体; TEXT-ALIGN: center }
</STYLE>
</HEAD>
<BODY>
<FORM id="form1" runat="server">
<DIV>
<ASP:LABEL id="lblPrompt" runat="server" text="?" enableviewstate="False" enabletheming="True"></ASP:LABEL>
<BR>
<ASP:PANEL id="pnlButtons" runat="server" width="560px">
<INPUT id="hidFirstPage" type="hidden" value="0" runat="server"><INPUT id="hidPageCount" type="hidden" runat="server">
<ASP:DATAGRID id="dg" runat="server" width="100%" onitemdatabound="dg_ItemDataBound" cellpadding="4"
backcolor="White" borderwidth="1px" borderstyle="None" bordercolor="#CC9966" autogeneratecolumns="False"
pagesize="5">
<FOOTERSTYLE forecolor="#330099" backcolor="#FFFFCC"></FOOTERSTYLE>
<HEADERSTYLE font-bold="True" forecolor="#FFFFCC" backcolor="#990000"></HEADERSTYLE>
<PAGERSTYLE horizontalalign="Center" forecolor="#330099" backcolor="#FFFFCC"></PAGERSTYLE>
<SELECTEDITEMSTYLE font-bold="True" forecolor="#663399" backcolor="#FFCC66"></SELECTEDITEMSTYLE>
<ITEMSTYLE forecolor="#330099" backcolor="White"></ITEMSTYLE>
<COLUMNS>
<ASP:BOUNDCOLUMN datafield="megaid" headertext="MegaID"></ASP:BOUNDCOLUMN>
<ASP:BOUNDCOLUMN datafield="megaguid" headertext="MegaGUID"></ASP:BOUNDCOLUMN>
</COLUMNS>
</ASP:DATAGRID>
</ASP:PANEL></DIV>
<BR>
<ASP:HYPERLINK id="lnkReload" runat="server" width="80px" navigateurl="Pager.aspx" enableviewstate="False">重载</ASP:HYPERLINK>
</FORM>
</BODY>
</HTML>
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