使用控件自带的分页功能时，会先将所查询的数据全部加载出来，若数据量较大，则造成浏览器端等待时间过长。
然而在庞大的数据量，用户所需要的不过是那么几条，甚至只要其中的一条数据，所以，为了减少开销，每次只从数据库中读取10条数据。
以下是我做过的一个例子，该数据库表中有101万行数据，只要将数据库连接修改一下，即可复制，粘贴使用。
以下是aspx中的代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="test" %> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <link rel="stylesheet" type="text/css" href="../Styles/bootstrap.min.css" /> <link rel="stylesheet" type="text/css" href="../Styles/admin-all.css" /> <link rel="stylesheet" type="text/css" href="../Styles/ui-lightness/jquery-ui-1.8.22.custom.css" /> <link rel="stylesheet" type="text/css" href="../Styles/web.css" /> <script type="text/javascript" src="../Scripts/jquery-1.7.2.js"></script> <script type="text/javascript" src="../Scripts/jquery-ui-1.8.22.custom.min.js"></script> <script type="text/javascript" src="../Scripts/My97DatePicker/WdatePicker.js"></script> </head> <body> <form id="form1" runat="server"> <div> <table id="Search" class="table table-striped table-bordered table-condensed"> <thead> <tr> <td colspan="6"> 患者管理查询 </td> </tr> </thead> <tr> <td rowspan="2"> 精确查找 </td> <td> 编号： </td> <td> <asp:TextBox ID="TextBoxIDNumber" runat="server"></asp:TextBox> </td> </tr> <tr> <td> 姓名： </td> <td> <asp:TextBox ID="TextBoxName" runat="server"></asp:TextBox> </td> </tr> <tr> <td rowspan="2"> 模糊查询： </td> <td> 编号： </td> <td> <asp:TextBox ID="TextBoxNumberx" runat="server"></asp:TextBox> </td> </tr> <tr> <td> 姓名： </td> <td> <asp:TextBox ID="TextBoxNamex" runat="server"></asp:TextBox> </td> </tr> <tr> <td> </td> <td> 排列方式 </td> <td> <asp:DropDownList ID="DropDownList1" runat="server"> <asp:ListItem Value="1">按ID正序</asp:ListItem> <asp:ListItem Value="2">按ID倒序</asp:ListItem> </asp:DropDownList> </td> </tr> <tr> <td colspan="3"> <asp:Button ID="ButtonSearch" runat="server" Text="查询" OnClick="ButtonSearch_Click" /> <asp:Button ID="ButtonExcel" runat="server" Text="导出" OnClick="ButtonExcel_Click" /> </td> </tr> </table> <asp:Repeater ID="Repeater1" runat="server"> <HeaderTemplate> <table> <tr> <td style="50px;"> ID </td> <td style="150px;"> 编号 </td> <td style="100px;"> 姓名 </td> </tr> </HeaderTemplate> <ItemTemplate> <tr> <td style=" color:Green;"> <%#Eval("ID")%> </td> <td style="color:Blue;"> <%#Eval("Number")%> </td> <td style="color:Red;"> <%#Eval("Name")%> </td> </tr> </ItemTemplate> <FooterTemplate> </table> </FooterTemplate> </asp:Repeater> <table> <tr > <td> <asp:LinkButton ID="LinkButtonFirst" runat="server" onclick="LinkButtonFirst_Click">首页</asp:LinkButton></td> <td> <asp:TextBox ID="TextBoxGo" runat="server" Width="29px"></asp:TextBox></td> <td> <asp:LinkButton ID="LinkButtonGo" runat="server" onclick="LinkButtonGo_Click">前往</asp:LinkButton></td> <td> <asp:Label ID="Label1" runat="server" Text="第"></asp:Label></td> <td> <asp:Label ID="index" runat="server" Text="1"></asp:Label></td> <td> <asp:Label ID="Label3" runat="server" Text="页"></asp:Label></td> <td> <asp:Label ID="Label2" runat="server" Text="共"></asp:Label></td> <td> <asp:Label ID="labcount" runat="server" Text=""></asp:Label></td> <td> <asp:Label ID="Label5" runat="server" Text="页"></asp:Label></td> <td> <asp:LinkButton ID="LinkButtonBefore" runat="server" onclick="LinkButtonBefore_Click">上一页</asp:LinkButton></td> <td> <asp:LinkButton ID="LinkButtonAfter" runat="server" onclick="LinkButtonAfter_Click">下一页</asp:LinkButton></td> <td> <asp:LinkButton ID="LinkButtonLast" runat="server" onclick="LinkButtonLast_Click">尾页</asp:LinkButton></td> </tr> </table> </div> </form> </body> </html>
下面是后台cs代码：
public partial class test : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { this.shuju(); } } /// <summary> /// 获取数据，并设置页数 /// </summary> /// <param name="pagenumber"></param> public void GetData(int pagenumber) { string str_sql1 = "select id,number,name from dbo.test "; string str_sql2 = "select count(*) from dbo.test "; //获得数据总行数 if (ViewState["where"] != null) { str_sql2 += ViewState["where"].ToString(); str_sql1 += ViewState["where"].ToString(); } if (ViewState["order"] != null) { str_sql1 += ViewState["order"].ToString(); } else { str_sql1 += " order by id "; } str_sql1 += " offset " + pagenumber + " rows fetch next 10 rows only "; string rowsNumber = MySql.GetSingleStr(str_sql2); //获得数据总行数 DataTable dt = MySql.GetDataTable(str_sql1); if (Convert.ToInt32(rowsNumber) % 10 != 0) { labcount.Text = (Convert.ToInt32(rowsNumber) / 10 + 1).ToString(); //返回总页数，不能被10整除则加一页 } else { labcount.Text = (Convert.ToInt32(rowsNumber) / 10).ToString(); //返回总页数 } this.Repeater1.DataSource = dt; this.Repeater1.DataBind(); } /// <summary> /// 初始化数据 /// </summary> public void shuju() { GetData(0); index.Text = "1"; //当前页为1 //把首页和上一页设置为不可操作 if (index.Text == "1") { LinkButtonFirst.Enabled = false; LinkButtonBefore.Enabled = false; } if (index.Text == labcount.Text) { LinkButtonAfter.Enabled = false; LinkButtonLast.Enabled = false; } else { LinkButtonAfter.Enabled = true; LinkButtonLast.Enabled = true; } } /// <summary> /// 首页按钮事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void LinkButtonFirst_Click(object sender, EventArgs e) { GetData(0); index.Text = "1"; //当前页为1 //把首页和上一页设置为不可操作 if (index.Text == "1") { LinkButtonFirst.Enabled = false; LinkButtonBefore.Enabled = false; } if (index.Text == labcount.Text) { LinkButtonAfter.Enabled = false; LinkButtonLast.Enabled = false; } else { LinkButtonAfter.Enabled = true; LinkButtonLast.Enabled = true; } } /// <summary> /// Go按钮事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void LinkButtonGo_Click(object sender, EventArgs e) { if (TextBoxGo.Text != "") { string pageindex = TextBoxGo.Text; //获取要前往的页数 int intpageindex = Convert.ToInt32(pageindex); //转为整型 int pagecount = Convert.ToInt32(labcount.Text); if (intpageindex > pagecount&&intpageindex<=0) //判断，如果输入的数字大于总页数就返回 { return; } else { int pageNumber = Convert.ToInt32(TextBoxGo.Text)*10-10; GetData(pageNumber); if (TextBoxGo.Text == "1") //判断如果输入1，首页和上一页不可操作，但是尾页和下一页可以操作 { LinkButtonFirst.Enabled = false; LinkButtonBefore.Enabled = false; LinkButtonAfter.Enabled = true; LinkButtonLast.Enabled = true; } else if (TextBoxGo.Text == labcount.Text) //判断如果输入的数等于总页数，首页和第一页可以操作，但是尾页和下一页不可操作 { LinkButtonAfter.Enabled = false; LinkButtonLast.Enabled = false; LinkButtonFirst.Enabled = true; LinkButtonBefore.Enabled = true; } else //如果是其他情况，首页和下一页，尾页和下一页都可操作 { LinkButtonAfter.Enabled = true; LinkButtonLast.Enabled = true; LinkButtonFirst.Enabled = true; LinkButtonBefore.Enabled = true; } } index.Text = TextBoxGo.Text; //设置当前页数等于输入的页数 } else { return; } } /// <summary> /// 上一页按钮事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void LinkButtonBefore_Click(object sender, EventArgs e) { string pageindex = index.Text; //获取当前页数 int pageNumber = Convert.ToInt32(pageindex) * 10 - 20; //获取上一页之前的总行数 GetData(pageNumber); int intindex = Convert.ToInt32(index.Text); index.Text = (intindex - 1).ToString(); //当前页-1 LinkButtonAfter.Enabled = true; LinkButtonLast.Enabled = true; if (index.Text == "1") { LinkButtonFirst.Enabled = false; LinkButtonBefore.Enabled = false; } } /// <summary> /// 下一页按钮事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void LinkButtonAfter_Click(object sender, EventArgs e) { string pageindex = index.Text; //获取当前页数 int pageNumber = Convert.ToInt32(pageindex)*10; //获取下一页之前的总行数 GetData(pageNumber); int intindex = Convert.ToInt32(index.Text); index.Text = (intindex + 1).ToString(); //当前页+1 LinkButtonFirst.Enabled = true; LinkButtonBefore.Enabled = true; if (index.Text == labcount.Text) { LinkButtonAfter.Enabled = false; LinkButtonLast.Enabled = false; } } /// <summary> /// 尾页按钮事件 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> protected void LinkButtonLast_Click(object sender, EventArgs e) { int pageNumber = (Convert.ToInt32(labcount.Text) - 1) * 10; //获取最后一页之前的总行数 GetData(pageNumber); index.Text = labcount.Text; LinkButtonFirst.Enabled = true; LinkButtonBefore.Enabled = true; LinkButtonAfter.Enabled = false; LinkButtonLast.Enabled = false; } protected void ButtonSearch_Click(object sender, EventArgs e) { string strWhere = " where "; string strOrder = " order by ID "; if (TextBoxIDNumber.Text != "") //填写编号 { strWhere += "Number='" + TextBoxIDNumber.Text + "' and "; } if (TextBoxName.Text != "") //填写姓名 { strWhere += "Name='" + TextBoxName.Text + "' and "; } if (TextBoxNumberx.Text != "") //填写模糊编号 { strWhere += "Number like '" + TextBoxNumberx.Text + "%' and "; } if (TextBoxNamex.Text != "") //编写模糊姓名 { strWhere += "Name like '" + TextBoxNamex.Text + "%' and "; } strWhere += " 1=1 "; if (DropDownList1.SelectedValue == "2") //选择倒序 { strOrder += " desc"; } ViewState["where"] = strWhere; ViewState["order"] = strOrder; shuju(); } protected void ButtonExcel_Click(object sender, EventArgs e) { string sql = "select id,number,name from dbo.test "; if(ViewState["where"]!=null) { sql += ViewState["where"].ToString(); } if (ViewState["order"] != null) { sql += ViewState["order"].ToString(); } DataTable dtexcel = MySql.GetDataTable(sql); Random ran = new Random(); string temp = ran.Next(1000, 9999).ToString(); string excel = "Excel-" + DateTime.Now.ToString("yyyyMMdd") + temp; CreateExcel(dtexcel, "application/ms-excel", excel); } /// <summary> /// 导出excel /// </summary> /// <param name="dt">数据源</param> /// <param name="FileType">文件类型</param> /// <param name="FileName">文件名</param> public void CreateExcel(DataTable dt, string FileType, string FileName) { Response.Clear(); Response.Charset = "UTF-8"; Response.Buffer = true; Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312"); Response.AppendHeader("Content-Disposition", "attachment;filename="" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls""); Response.ContentType = FileType; string colHeaders = string.Empty; string ls_item = string.Empty; ls_item += "ID 编号 姓名 "; DataRow[] myRow = dt.Select(); int i = 0; int cl = dt.Columns.Count; foreach (DataRow row in myRow) { for (i = 0; i < cl; i++) { if (i == (cl - 1)) { ls_item += row[i].ToString() + " "; } else { ls_item += row[i].ToString() + " "; } } Response.Output.Write(ls_item); ls_item = string.Empty; } Response.Output.Flush(); Response.End(); } }
附带excel导出功能。