轉載一個存儲過程分頁

其實原理也很簡單，存儲過程裏面主要是根據傳入的參數來取總記錄數，和需要查詢的數據，而不是一次把全部數據都取出來，提高了執行速度。

存儲過程代碼如下：

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

/****
使用幫助
首先查詢表總行數，再查詢分頁數據
查詢行數傳入參數：@doCount，@tblName
查詢分頁傳入參數：@tblName，@PageSize，@PageIndex，@fldName
*以上不帶查詢條件的查詢
帶條件的加參數：@strWhere
*分頁查詢可以使用排序
參數：@OrderType
****/ 

ALTER PROCEDURE [dbo].[Sp_Conn_Sort]
(
	@tblName varchar(255), -- 表名
	@strGetFields varchar(1000) = '*', -- 需要返回的列 
	@fldName varchar(255)='', -- 排序的字段名
	@PageSize int = 40, -- 頁尺寸
	@PageIndex int = 1, -- 頁碼
	@doCount bit = 0, -- 返回記錄總數, 非 0 值則返回
	@OrderType bit = 0, -- 設置排序類型, 非 0 值則降序
	@strWhere varchar(1500)='' -- 查詢條件 (注意: 不要加 where)
)
AS

	declare @strSQL varchar(5000) -- 主語句
	declare @strTmp varchar(110) -- 臨時變量
	declare @strOrder varchar(400) -- 排序類型


if @doCount != 0
begin
	if @strWhere !=''
		set @strSQL = 'select count(*) as Total from ' + @tblName + ' where '+@strWhere
	else
		set @strSQL = 'select count(*) as Total from ' + @tblName 
	end 
--以上代碼的意思是如果@doCount傳遞過來的不是0，就執行總數統計。以下的所有代碼都是@doCount爲0的情況
else
begin

	if @OrderType != 0
	begin
		set @strTmp = '<(select min'
		set @strOrder = ' order by ' + @fldName +' desc'
		--如果@OrderType不是0，就執行降序，這句很重要！
	end
	else
	begin
		set @strTmp = '>(select max'
		set @strOrder = ' order by ' + @fldName +' asc'
	end



if @PageIndex = 1

begin
if @strWhere != '' 
	set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from ' + @tblName + ' where ' + @strWhere + ' ' + @strOrder
else
	set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from '+ @tblName + ' '+ @strOrder
	--如果是第一頁就執行以上代碼，這樣會加快執行速度
end
else
begin
	--以下代碼賦予了@strSQL以真正執行的SQL代碼
	set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from '
	+ @tblName + ' where ' + @fldName + '' + @strTmp + '('+ @fldName + ') from (select top ' + str((@PageIndex-1)*@PageSize) + ' '+ @fldName + ' from ' + @tblName + '' + @strOrder + ') as tblTmp)'+ @strOrder

	if @strWhere != ''
	set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from '
	+ @tblName + ' where ' + @fldName + '' + @strTmp + '('
	+ @fldName + ') from (select top ' + str((@PageIndex-1)*@PageSize) + ' '
	+ @fldName + ' from ' + @tblName + ' where ' + @strWhere + ' '
	+ @strOrder + ') as tblTmp) and ' + @strWhere + ' ' + @strOrder
end 

end 

exec (@strSQL)

 

下面是後臺代碼，這個部分寫出了怎麼樣調用存儲過程，以及構建翻頁按鈕，在寫法上有一些亂，可以參考一下算法。

int ToatalCountRecord;//總記錄數 
int PageItem = 10;//每頁顯示的條數 
int CurrentPage = 1;//當前頁數 
protected void Page_Load(object sender, EventArgs e)
{

if (!this.Page.IsPostBack)
{
if (Request.QueryString["page"] != null)
{
if (!Int32.TryParse(Request.QueryString["page"].ToString(), out CurrentPage))
{
Response.Write("請輸入分頁參數!");
Response.End();
return;
}
}

this.BuidGrid();
}
}

private void BuidGrid()
{
SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["constr"]);
con.Open();
SqlCommand cmd = new SqlCommand("Sp_Conn_Sort", con);
SqlParameter sp5 = new SqlParameter("@doCount", 1);
SqlParameter sp6 = new SqlParameter("@tblName", "num_s");
cmd.Parameters.Add(sp5);
cmd.Parameters.Add(sp6);
cmd.CommandType = CommandType.StoredProcedure;
ToatalCountRecord = Convert.ToInt32(cmd.ExecuteScalar());
SqlDataAdapter sda = new SqlDataAdapter("Sp_Conn_Sort", con);
sda.SelectCommand.CommandType = CommandType.StoredProcedure;
SqlParameter sp1 = new SqlParameter("@tblName", "num_s");
SqlParameter sp2 = new SqlParameter("@PageSize", PageItem);
SqlParameter sp3 = new SqlParameter("@PageIndex", CurrentPage);
SqlParameter sp4 = new SqlParameter("@fldName", "id");
sda.SelectCommand.Parameters.Add(sp1);
sda.SelectCommand.Parameters.Add(sp2);
sda.SelectCommand.Parameters.Add(sp3);
sda.SelectCommand.Parameters.Add(sp4);
DataSet ds = new DataSet();
sda.Fill(ds);
int s = ds.Tables[0].Rows.Count;
GridView1.DataSource = ds;
GridView1.DataBind();
con.Close();
BuildPages();
}
private void BuildPages()
{
int LeftStep = 3;//左偏移量
int RightStep = 2;//右偏移量
int LeftNum = 0;//左界限 
int RightNum = 0;//右界限 
string PageUrl = Request.FilePath;
int PageCount = (int)Math.Ceiling((double)(ToatalCountRecord) / PageItem);
if (CurrentPage < 5)
{
LeftNum = 1;
RightStep = 6 - CurrentPage;
}
else
{
if (PageCount - CurrentPage < 2)
{
RightNum = PageCount;
LeftStep = 5 - (PageCount - CurrentPage);
}
LeftNum = CurrentPage - LeftStep;
}
if (PageCount - CurrentPage > 1)
RightNum = CurrentPage + RightStep;
//上面代碼有點混亂，重讀需琢磨。
StringBuilder stringbuilder = new StringBuilder();
if (CurrentPage > 1)
{
string OutPut = " <a href='" + PageUrl + "?page=" + (CurrentPage - 1) + "'>" + "上一頁" + " </a>";
stringbuilder.Append(OutPut);
}
for (int i = LeftNum; i <= RightNum; i++)
{
if (i == CurrentPage)
{
string OutPut = " <font color=red>" + " " + "[" + i.ToString() + "]" + "" + " </font>";
stringbuilder.Append(OutPut);
}
else
{
string OutPut = " <a href='" + PageUrl + "?page=" + i.ToString() + "'>" + " " + "[" + i.ToString() + "]" + " " + " </a>";
stringbuilder.Append(OutPut);
}
}
if (PageCount - CurrentPage > 2)
{
string OutPut = " <a href='" + PageUrl + "?page=" + PageCount + "'>..." + PageCount + "</a>";
stringbuilder.Append(OutPut);
}
if (CurrentPage < PageCount)
{
string OutPut = " <a href='" + PageUrl + "?page=" + (CurrentPage + 1) + "'>" + "下一頁" + " </a>";
stringbuilder.Append(OutPut);
} this.PageInfo.InnerHtml = stringbuilder.ToString();
}

 

前臺代碼如下：

<div>
<div id="PageInfo" runat="server"></div>
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="id"
Height="303px">
<Columns>
<asp:BoundField DataField="id" HeaderText="編號" />
<asp:BoundField DataField="num" HeaderText="號碼" />
</Columns>
</asp:GridView>
</div>