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;