ASP.NET和MSSQL高性能分页

2/11/2016来源:C#应用人气:1232

首先是存储过程,只取出我需要的那段数据,如果页数超过数据总数,自动返回最后一页的纪录:

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: Clear
-- Description: 高性能分页
-- http://www.cnblogs.com/roucheng/
-- =============================================
Alter 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

  然后是分页控件(... 为省略的生成HTML代码方法):

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 http://www.cnblogs.com/roucheng/
        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));
        }
        TagBox.InnerHtml = Tag.GetHtml;