ASP.NET存儲過程自定義分頁詳解
大家都知道Asp.net中的Gridview。datalist等都可以自定義分頁,但是當你翻頁的時候,數據表中的所有數據都會加載到內存,重 新綁定,當然要是數據量小的話,這是可以的,我們也很樂意用,原因簡單因爲方便,但是要是數據量是999999999999……,在信息爆炸的這個時代海 量數據是經常的時,那麼這些控件自帶的分頁就顯得有些……
解決這個問題辦法就是自己動手……不多廢話了,看代碼:
1.首先我是用存儲過程來解決的,要弄懂這個問題,首先要從存儲過程下手,代碼如下:
CREATE proc getdataset |
其實代碼也很簡單,學編程的人基本上都是懂數據庫的,這個存儲過程估計不是問題。
其他的代碼我都做了解釋,有顏色的那段我沒有解釋,我在這裏解釋一下。其實也很簡單,大家來看:
select top '+str((@intPageNo-1)*@intPageSize)+' '+@SelectOrderId+' from '+@TableName+' '+@SelectWhere +' '+@SelectOrder+'
這段代碼的執行結果是什麼了,是不是當前頁前面的主鍵的集合啊,現在我們從所有的表中選出主鍵的值不在這個結果的之內的pagesize個記錄不就是當前頁的內容了嗎?
2.Aspx頁面就不用再將了吧?我這裏將代碼寫上:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="aa.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>無標題頁</title> </head> <body> <form id="form1" runat="server"> <div> <Asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" Height="180px" Width="867px"> <Columns> <Asp:BoundField DataField="job_id" HeaderText="job_id" /> <Asp:BoundField DataField="job_desc" HeaderText="job_desc" /> <Asp:BoundField DataField="max_lvl" HeaderText="max_lxl" /> </Columns> </Asp:GridView> </div> <Asp:HyperLink ID="hylfirst" runat="server">首頁</Asp:HyperLink> <Asp:HyperLink ID="hylprev" runat="server">上一頁</Asp:HyperLink> <Asp:HyperLink ID="hylnext" runat="server">下一頁</Asp:HyperLink> <Asp:HyperLink ID="hylend" runat="server">尾頁</Asp:HyperLink> 第<Asp:Label ID="lbRow" runat="server" Text="Label"></Asp:Label>頁, 共<Asp:Label ID="lbpage" runat="server" Text="Label"></Asp:Label>頁,共<Asp:Label ID="lbRecord" runat="server" Text="Label"></Asp:Label>條記錄,轉到<Asp:TextBox ID="txtlink" runat="server" Width="29px"></Asp:TextBox> 頁<Asp:LinkButton ID="link" runat="server" OnClick="link_Click" TabIndex="1">轉到</Asp:LinkButton> </form> </body> </html> |
3.cs頁面其實也每頁什麼好講的,也就是一些常用的代碼罷了……CrazyCoder 傲博知識庫代碼加上,大家看看,要是有疑問的可以回覆我再解釋:
using System; using System.Data; using System.Configuration; using System.Collections; 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.SqlClient; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { this.bind(); } protected void link_Click(object sender, EventArgs e) { int page = Convert.ToInt32(txtlink.Text); Response.Redirect("aa.Aspx?CurrentPage="+page+""); } public void bind() { int sumPage; int pageNo = 1; int pageSize = 3; if (Request.QueryString["CurrentPage"] == null) { pageNo = 1; } else { pageNo = Int32.Parse(Request.QueryString["CurrentPage"]); } SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["ConStr"]); SqlDataAdapter da = new SqlDataAdapter(); da.SelectCommand = new SqlCommand(); da.SelectCommand.Connection = conn; da.SelectCommand.CommandText = "getdataset"; da.SelectCommand.CommandType = CommandType.StoredProcedure; da.SelectCommand.Parameters.Add("@TableList", SqlDbType.VarChar, 200).Value = "job_id,job_desc,max_lvl"; da.SelectCommand.Parameters.Add("@TableName", SqlDbType.VarChar, 30).Value = "jobs"; //da.SelectCommand.Parameters.Add("@SelectWhere", SqlDbType.VarChar, 500).Value = "where d=1"; da.SelectCommand.Parameters.Add("@SelectOrderId", SqlDbType.VarChar, 20).Value = "job_id"; da.SelectCommand.Parameters.Add("@SelectOrder", SqlDbType.VarChar, 200).Value = "order by min_lvl asc"; da.SelectCommand.Parameters.Add("@intPageNo", SqlDbType.Int).Value = pageNo; da.SelectCommand.Parameters.Add("@intPageSize", SqlDbType.Int).Value = pageSize; da.SelectCommand.Parameters.Add("@RecordCount", SqlDbType.Int).Direction = ParameterDirection.Output; da.SelectCommand.Parameters.Add("RowCount", SqlDbType.Int).Direction = ParameterDirection.ReturnValue; DataSet ds = new DataSet(); da.Fill(ds, "jobs"); GridView1.DataSource = ds; GridView1.DataBind(); Int32 RecordCount = (Int32)da.SelectCommand.Parameters["@RecordCount"].Value; //求出總記錄數,該值是output出來的值 Int32 RowCount = (Int32)da.SelectCommand.Parameters["RowCount"].Value; //求出當前頁中的記錄數,在最後一頁不等於pagesize, lbRecord.Text = RecordCount.ToString(); lbRow.Text = pageNo.ToString(); sumPage = (Int32)RecordCount / pageSize; if (RecordCount % pageSize > 0) { sumPage = sumPage + 1; } lbpage.Text = sumPage.ToString(); if (pageNo > 1) { hylfirst.NavigateUrl = "aa.Aspx?CurrentPage=1"; hylprev.NavigateUrl = string.Concat("aa.Aspx?CurrentPage=", "", pageNo - 1); } else { hylprev.NavigateUrl = ""; hylfirst.NavigateUrl = ""; hylfirst.Visible = false; hylprev.Visible = false; } if (pageNo < sumPage) { hylend.NavigateUrl = string.Concat("aa.Aspx?CurrentPage=", "", sumPage); hylnext.NavigateUrl = string.Concat("aa.Aspx?CurrentPage=", "", pageNo + 1); } else { hylnext.NavigateUrl = ""; hylend.NavigateUrl = ""; hylend.Visible = false; hylnext.Visible = false; } } } |