sqlserver 高性能分页实现分析

Declare @ID int
Declare @MoveRecords int

--@CurrentPage和@PageSize是传入参数
Set @MoveRecords=@CurrentPage * @PageSize+1

--下面两行实现快速滚动到我们要取的数据的行，并把ID记录下来
Set Rowcount @MoveRecords
Select @ID=ID from Table1 Order by ID

Set Rowcount @PageSize
--最恨为了减少麻烦使用*了，但是在这里为了说明方便，暂时用一下
Select * From Table1 Where ID>=@ID Order By ID
Set Rowcount 0

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
Create PROCEDURE [dbo].[Tag_Page_Name_Select]
-- 传入最大显示纪录数和当前页码
@MaxPageSize int,
@PageNum int,
-- 设置一个输出参数返回总纪录数供分页列表使用
@Count int output
AS
BEGIN
SET NOCOUNT ON;

DECLARE
-- 定义排序名称参数
@Name nvarchar(50),
-- 定义游标位置
@Cursor int
-- 首先得到纪录总数
Select @Count = count(tag_Name)
FROM [viewdatabase0716].[dbo].[view_tag];
-- 定义游标需要开始的位置
Set @Cursor = @MaxPageSize*(@PageNum-1)+1
-- 如果游标大于纪录总数将游标放到最后一页开始的位置
IF @Cursor > @Count
BEGIN
-- 如果最后一页与最大每次纪录数相等，返回最后整页
IF @Count % @MaxPageSize = 0
BEGIN
IF @Cursor > @MaxPageSize
Set @Cursor = @Count - @MaxPageSize + 1
ELSE
Set @Cursor = 1
END
-- 否则返回最后一页剩下的纪录
ELSE
Set @Cursor = @Count - (@Count % @MaxPageSize) + 1
END
-- 将指针指到该页开始
Set Rowcount @Cursor
-- 得到纪录开始的位置
Select @Name = tag_Name
FROM [viewdatabase0716].[dbo].[view_tag]
orDER BY tag_Name;
-- 设置开始位置
Set Rowcount @MaxPageSize
-- 得到该页纪录
Select *
From [viewdatabase0716].[dbo].[view_tag]
Where tag_Name >= @Name
order By tag_Name

Set Rowcount 0
END

using System.Data;
using System.Configuration;
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.Text;

/// summary>
/// 扩展连接字符串
/// /summary>
public class ExStringBuilder
{
private StringBuilder InsertString;
private StringBuilder PageString;
private int PrivatePageNum = 1;
private int PrivateMaxPageSize = 25;
private int PrivateMaxPages = 10;
private int PrivateCount;
private int PrivateAllPage;
public ExStringBuilder()
{
InsertString = new StringBuilder("");
}
/// summary>
/// 得到生成的HTML
/// /summary>
public string GetHtml
{
get
{
return InsertString.ToString();
}
}
/// summary>
/// 得到生成的分页HTML
/// /summary>
public string GetPageHtml
{
get
{
return PageString.ToString();
}
}
/// summary>
/// 设置或获取目前页数
/// /summary>
public int PageNum
{
get
{
return PrivatePageNum;
}
set
{
if (value >= 1)
{
PrivatePageNum = value;
}
}
}
/// summary>
/// 设置或获取最大分页数
/// /summary>
public int MaxPageSize
{
get
{
return PrivateMaxPageSize;
}
set
{
if (value >= 1)
{
PrivateMaxPageSize = value;
}
}
}
/// summary>
/// 设置或获取每次显示最大页数
/// /summary>
public int MaxPages
{
get
{
return PrivateMaxPages;
}
set
{
PrivateMaxPages = value;
}
}
/// summary>
/// 设置或获取数据总数
/// /summary>
public int DateCount
{
get
{
return PrivateCount;
}
set
{
PrivateCount = value;
}
}
/// summary>
/// 获取数据总页数
/// /summary>
public int AllPage
{
get
{
return PrivateAllPage;
}
}
/// summary>
/// 初始化分页
/// /summary>
public void Pagination()
{
PageString = new StringBuilder("");
//得到总页数
PrivateAllPage = (int)Math.Ceiling((decimal)PrivateCount / (decimal)PrivateMaxPageSize);
//防止上标或下标越界
if (PrivatePageNum > PrivateAllPage)
{
PrivatePageNum = PrivateAllPage;
}
//滚动游标分页方式
int LeftRange, RightRange, LeftStart, RightEnd;
LeftRange = (PrivateMaxPages + 1) / 2-1;
RightRange = (PrivateMaxPages + 1) / 2;
if (PrivateMaxPages >= PrivateAllPage)
{
LeftStart = 1;
RightEnd = PrivateAllPage;
}
else
{
if (PrivatePageNum = LeftRange)
{
LeftStart = 1;
RightEnd = LeftStart + PrivateMaxPages - 1;
}
else if (PrivateAllPage - PrivatePageNum RightRange)
{
RightEnd = PrivateAllPage;
LeftStart = RightEnd - PrivateMaxPages + 1;
}
else
{
LeftStart = PrivatePageNum - LeftRange;
RightEnd = PrivatePageNum + RightRange;
}
}

//生成页码列表统计
PageString.Append(...);

StringBuilder PreviousString = new StringBuilder("");
//如果在第一页
if (PrivatePageNum > 1)
{
...
}
else
{
...
}
//如果在第一组分页
if (PrivatePageNum > PrivateMaxPages)
{
...
}
else
{
...
}
PageString.Append(PreviousString);
//生成中间页
for (int i = LeftStart; i = RightEnd; i++)
{
//为当前页时
if (i == PrivatePageNum)
{
...
}
else
{
...
}
}
StringBuilder LastString = new StringBuilder("");
//如果在最后一页
if (PrivatePageNum PrivateAllPage)
{
...
}
else
{
...
}
//如果在最后一组
if ((PrivatePageNum + PrivateMaxPages) PrivateAllPage)
{
...
}
else
{
...
}
PageString.Append(LastString);
}
/// summary>
/// 生成Tag分类表格
/// /summary>
public void TagTable(ExDataRow myExDataRow)
{
InsertString.Append(...);
}

调用方法:
//得到分页设置并放入Session
ExRequest myExRequest = new ExRequest();
myExRequest.PageSession("Tag_", new string[] { "page", "size" });
//生成Tag分页
ExStringBuilder Tag = new ExStringBuilder();
//设置每次显示多少条纪录
Tag.MaxPageSize = Convert.ToInt32(Session["Tag_size"]);
//设置最多显示多少页码
Tag.MaxPages = 9;
//设置当前为第几页
Tag.PageNum = Convert.ToInt32(Session["Tag_page"]);
string[][] myNamenValue = new string[2][]{
new string[]{"MaxPageSize","PageNum","Count"},
new string[]{Tag.MaxPageSize.ToString(),Tag.PageNum.ToString()}
};
//调用存储过程
DataTable myDataTable = mySQL.BatchGetDB("Tag_Page_Name_Select", myNamenValue, "Count");
Tag.DateCount = (int)mySQL.OutputCommand.Parameters["@Count"].Value;
Tag.Pagination();

HeadPage.InnerHtml = FootPage.InnerHtml = Tag.GetPageHtml;

for (int i = 0, j = myDataTable.Rows.Count; i j; i++)
{
Tag.TagTable(new ExDataRow(myDataTable.Rows[i]));
}
TagBox.InnerHtml = Tag.GetHtml;