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原创企业级控件库之大数据量分页控件

简介: 版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/chinahuyong/article/details/6084638 原创企...
版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/chinahuyong/article/details/6084638

原创企业级控件库之大数据量分页控件

                                                                                                                                                                                                                                  发布日期:2010年12月18日星期六作者:EricHu

 

       在上篇:我介绍了原创企业级控件库之组合查询控件,这篇我将给大家介绍:企业级控件库之大数据量分页控件。

  摘要

    说到分页,大家采用的方法各有千秋,分页在一个中大型软件项目中对数据的快速呈现起到很关键的作用,试想一个数据量上几十万或者几百万的数据表,要是没有分页功能会是一个什么样的效果。总的说来,大家采用的分页方法大同小异,但到底那种方法才是最佳的呢,各有各的看法,让数据说话最有效。今天我给大家分享一个WinForm下大数据量分页控件(当然分页思想也可用于WebForm)。虽然不能说是最佳的,但在我的几个实际项目中,用的都是它,效果不错,可放心使用。

   成就别人、等于成就自己。我没什么要求,欢迎大家多多支持与评论,觉得不错的,记得点击文章左下角的”关注博客”,就这么简单。同时,你要用什么好的想法,也可以与我交流,谢谢。

  分页控件运行效果如下图:

 

  

       用到的分页存储过程:  

 

/****** 对象:  StoredProcedure [dbo].[uspDividePage]    脚本日期: 12/18/2010 22:28:31 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

CREATE    PROCEDURE [dbo].[uspDividePage]
  /*
 ***************************************************************
 ** 千万数量级分页存储过程 **
 ***************************************************************
 参数说明:
 1.Tables	   :表名或视图名
 2.PrimaryKey  :主关键字
 3.Sort		   :排序语句,不带Order By 比如:UserId Desc,CreateDate Asc
 4.CurrentPage :当前页码
 5.PageSize	   :分页尺寸
 6.Fields      :字段列表(默认为:*)
 7.Filter      :过滤语句,不带Where 
 8.Group	   :Group语句,不带Group By
 ***************************************************************/
 (
 @Tables varchar(2000),
 @PrimaryKey varchar(500),
 @Sort varchar(500) = NULL,
 @CurrentPage int = 1,
 @PageSize int = 10,
 @Fields varchar(2000) = '*',
 @Filter varchar(1000) = NULL,
 @Group varchar(1000) = NULL
 )
 AS
/*默认排序*/
 IF @Sort IS NULL OR @Sort = ''
	 SET @Sort = @PrimaryKey

 DECLARE @SortTable varchar(1000)
 DECLARE @SortName varchar(1000)
 DECLARE @strSortColumn varchar(1000)
 DECLARE @operator char(2)
 DECLARE @type varchar(1000)
 DECLARE @prec int

  /*设定排序语句.*/
 IF CHARINDEX('DESC',@Sort)>0
	 BEGIN
	 SET @strSortColumn = REPLACE(@Sort, 'DESC', '')
	 SET @operator = '<='
	 END
 ELSE
	 BEGIN
	 IF CHARINDEX('ASC', @Sort) = 0
	 SET @strSortColumn = REPLACE(@Sort, 'ASC', '')
	 SET @operator = '>='
	 END

 IF CHARINDEX('.', @strSortColumn) > 0
	 BEGIN
	 SET @SortTable = SUBSTRING(@strSortColumn, 0, CHARINDEX('.',@strSortColumn))
	 SET @SortName = SUBSTRING(@strSortColumn, CHARINDEX('.',@strSortColumn) + 1, LEN(@strSortColumn))
	 END
 ELSE
	 BEGIN
	 SET @SortTable = @Tables
	 SET @SortName = @strSortColumn
	 END

 SELECT @type=t.name, @prec=c.prec
 FROM sysobjects o 
 JOIN syscolumns c on o.id=c.id
 JOIN systypes t on c.xusertype=t.xusertype
 WHERE o.name = @SortTable AND c.name = @SortName

 IF CHARINDEX('char', @type) > 0
	 SET @type = @type + '(' + CAST(@prec AS varchar) + ')'

 DECLARE @strPageSize varchar(500)
 DECLARE @strStartRow varchar(500)
 DECLARE @strFilter varchar(1000)
 DECLARE @strSimpleFilter varchar(1000)
 DECLARE @strGroup varchar(1000)
  /*默认当前页*/
 IF @CurrentPage < 1
	 SET @CurrentPage = 1

  /*设置分页参数.*/
 SET @strPageSize = CAST(@PageSize AS varchar(500))
 SET @strStartRow = CAST(((@CurrentPage - 1)*@PageSize + 1) AS varchar(500))

  /*筛选以及分组语句.*/
 IF @Filter IS NOT NULL AND @Filter != ''
	 BEGIN
	 SET @strFilter = ' WHERE ' + @Filter + ' '
	 SET @strSimpleFilter = ' AND ' + @Filter + ' '
	 END
 ELSE
	 BEGIN
	 SET @strSimpleFilter = ''
	 SET @strFilter = ''
	 END

 IF @Group IS NOT NULL AND @Group != ''
	 SET @strGroup = ' GROUP BY ' + @Group + ' '
 ELSE
	 SET @strGroup = ''

 /*执行查询语句*/
 EXEC(
	 '
	 DECLARE @SortColumn ' + @type + '
	 SET ROWCOUNT ' + @strStartRow + '
	 SELECT @SortColumn=' + @strSortColumn + ' FROM ' + @Tables + @strFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + '
	 SET ROWCOUNT ' + @strPageSize + '
	 SELECT ' + @Fields + ' FROM ' + @Tables + ' WHERE ' + @strSortColumn + @operator + ' @SortColumn ' + @strSimpleFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + '
	 ')


 

 

   本控件类图  

 

   本控件UcpageControl类详细信息


   本控件PageData类详细信息


   本控件核心代码

    一、数据源提供类PageData,主要负责与存储过程进行交互。

数据源提供(PageData)

  

数据源提供类PageData,主要负责与存储过程进行交互。
#region 数据源提供(PageData)
    /// <summary>
    /// 数据源提供
    /// </summary>
    public class PageData
    {
        DataSet ds                         = null;
        private int    _PageSize           = 50;           //分页大小
        private int    _PageIndex          = 1;            //当前页
        private int    _PageCount          = 0;            //总页数
        private int    _TotalCount         = 0;            //总记录数
        private string _QueryFieldName     = "*";          //表字段FieldStr
        private bool   _isQueryTotalCounts = true;         //是否查询总的记录条数
        private string _TableName          = string.Empty; //表名       
        private string _OrderStr           = string.Empty; //排序_SortStr
        private string _QueryCondition     = string.Empty; //查询的条件RowFilter
        private string _PrimaryKey         = string.Empty; //主键

        /// <summary>
        /// 是否查询总的记录条数
        /// </summary>
        public bool IsQueryTotalCounts
        {
            get { return _isQueryTotalCounts; }
            set { _isQueryTotalCounts = value; }
        }

        /// <summary>
        /// 分页大小(每页显示多少条数据)
        /// </summary>
        public int PageSize
        {
            get
            {
                return _PageSize;

            }
            set
            {
                _PageSize = value;
            }
        }

        /// <summary>
        /// 当前页
        /// </summary>
        public int PageIndex
        {
            get
            {
                return _PageIndex;
            }
            set
            {
                _PageIndex = value;
            }
        }

        /// <summary>
        /// 总页数
        /// </summary>
        public int PageCount
        {
            get
            {
                return _PageCount;
            }
        }

        /// <summary>
        /// 总记录数
        /// </summary>
        public int TotalCount
        {
            get
            {
                return _TotalCount;
            }
        }

        /// <summary>
        /// 表名或视图名
        /// </summary>
        public string TableName
        {
            get
            {
                return _TableName;
            }
            set
            {
                _TableName = value;
            }
        }

        /// <summary>
        /// 表字段FieldStr
        /// </summary>
        public string QueryFieldName
        {
            get
            {
                return _QueryFieldName;
            }
            set
            {
                _QueryFieldName = value;
            }
        }

        /// <summary>
        /// 排序字段
        /// </summary>
        public string OrderStr
        {
            get
            {
                return _OrderStr;
            }
            set
            {
                _OrderStr = value;
            }
        }

        /// <summary>
        /// 查询条件
        /// </summary>
        public string QueryCondition
        {
            get
            {
                return _QueryCondition;
            }
            set
            {
                _QueryCondition = value;
            }
        }

        /// <summary>
        /// 主键
        /// </summary>
        public string PrimaryKey
        {
            get 
            {
                return _PrimaryKey;
            }
            set 
            {
                _PrimaryKey = value;
            }
        }

        /// <summary>
        /// 得到分页数据
        /// </summary>
        /// <param name="connectionstring">连接字符串</param>
        /// <returns>DataSet</returns>
        public DataSet QueryDataTable(string connectionstring)
        {
            SqlParameter[] parameters = {
					new SqlParameter("@Tables",      SqlDbType.VarChar,  255),
				    new SqlParameter("@PrimaryKey" , SqlDbType.VarChar , 255),	
                    new SqlParameter("@Sort",        SqlDbType.VarChar , 255),
                    new SqlParameter("@CurrentPage", SqlDbType.Int          ),
					new SqlParameter("@PageSize",    SqlDbType.Int          ),									
                    new SqlParameter("@Fields",      SqlDbType.VarChar,  255),
					new SqlParameter("@Filter",      SqlDbType.VarChar,  1000),
                    new SqlParameter("@Group" ,      SqlDbType.VarChar,  1000)
					};
            parameters[0].Value = _TableName;
            parameters[1].Value = _PrimaryKey;
            parameters[2].Value = _OrderStr;
            parameters[3].Value = PageIndex;
            parameters[4].Value = PageSize;
            parameters[5].Value =_QueryFieldName;
            parameters[6].Value = _QueryCondition;
            parameters[7].Value = string.Empty;
            ds = null;
            ds = new DataSet();
            ds = DbHelperSQL.RunProcedure(connectionstring, "uspDividePage", parameters, "tbPageData");

            if (_isQueryTotalCounts)
            {
                _TotalCount = GetTotalCount(connectionstring);
            }

            if (_TotalCount == 0)
            {
                _PageIndex = 0;
                _PageCount = 0;
            }
            else
            {
                _PageCount = _TotalCount % _PageSize == 0 ? _TotalCount / _PageSize : _TotalCount / _PageSize + 1;

                if (_PageIndex > _PageCount)
                {
                    _PageIndex = _PageCount;
                    parameters[4].Value = _PageSize;
                    ds = QueryDataTable(connectionstring);
                }
            }

            return ds;
        }

        /// <summary>
        /// 得到总的记录数
        /// </summary>
        /// <param name="connectionstring">连接字符串</param>
        /// <returns>总的记录数</returns>
        public int GetTotalCount(string connectionstring)
        {
            string strSql = " select count(1) from "+_TableName;

            if (_QueryCondition != string.Empty)
            {
                strSql += " where " + _QueryCondition;
            }

            return Convert.ToInt32(DbHelperSQL.GetSingle(strSql.ToString(), connectionstring));
        }
    }
    #endregion


 

 窗体调用方法

 

 一、设置窗体调用公共方法。

#region 绑定DataGridView
        /// <summary>
        /// 绑定DataGridView
        /// </summary>
        /// <param name="sTb">表名</param>
        /// <param name="sPk">主键</param>
        /// <param name="sOrderField">排序字段</param>
        /// <param name="sWhere">查询条件</param>
        /// <param name="sQueryFieldName">字段列表</param>
        /// <returns>总记录数</returns>
        private int dgvBind(string sTb, string sPk, string sOrderField, string sWhere, string sQueryFieldName)
        {
            pageData = null;
            dtPub = null;
            pageData = new PageData();
            dtPub = new DataTable();
            pageData.TableName = sTb;
            pageData.PrimaryKey = sPk;
            pageData.OrderStr = sOrderField;
            pageData.PageIndex = this.ucPageControlTest.PageCurrent;
            pageData.PageSize = 200;
            pageData.QueryCondition = sWhere;
            pageData.QueryFieldName = sQueryFieldName;
            dtPub = pageData.QueryDataTable(ConfigurationSettings.AppSettings["DbConnection"]).Tables["tbPageData"];
            this.ucPageControlTest.bindingSource.DataSource = dtPub;
            this.ucPageControlTest.bindingNavigator.BindingSource = ucPageControlTest.bindingSource;
            dgvUcPageControlTest.DataSource = null;
            dgvUcPageControlTest.DataSource = this.ucPageControlTest.bindingSource;
            if (dgvUcPageControlTest.Rows.Count > 0)
            {
                dgvUcPageControlTest[4, ucPageControlTest.bindingSource.Position].Selected = true;
            }
            return pageData.TotalCount;
        }
        #endregion


二、在控件的EventPaging事件代码中调用即可。

 


return dgvBind("tbTestData", "UniqueID", "UniqueID", sQueryWhere, "*");
 

 

三、SqlServer测试数据代码如下:

 

-- =============================================
-- Author: EricHu  QQ:80368704 WebSite:http://www.cnblogs.com/huyong/
-- Create date: 2010-12-18  
-- Description: 原创企业级控件库之大数据量分页控件---测试数据
-- Modify Date: 2010-12-18   
-- =============================================  

/*一、创建数据库dbTest*/
CREATE DATABASE dbTest
go

/*二、创建数据表*/
USE [dbTest]
GO

CREATE TABLE [dbo].[tbTestData](
	[UniqueID] [bigint] IDENTITY(20000,1) NOT NULL,
	[CompanyName] [varchar](200) COLLATE Chinese_PRC_CI_AS NULL,
	[CompanyCode] [varchar](50) COLLATE Chinese_PRC_CI_AS NULL,
	[Address] [varchar](500) COLLATE Chinese_PRC_CI_AS NULL,
	[Owner] [varchar](100) COLLATE Chinese_PRC_CI_AS NULL,
	[Memo] [varchar](2000) COLLATE Chinese_PRC_CI_AS NULL,
	[InsetDataTime] [datetime] NULL CONSTRAINT [DF_tbTestData_InsetDataTime]  DEFAULT (getdate()),
 CONSTRAINT [PK_tbTestData] PRIMARY KEY CLUSTERED 
(
	[UniqueID] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

/*三、增加测试数据*/
declare @count bigint
select @count = 1
while @count <= 5000000
begin
	insert into tbTestData
	values('Company' + cast(@count as varchar),'CompanyCode' +  cast(@count as varchar)
		  ,'Address' +  cast(@count as varchar),'Owner' +  cast(@count as varchar)
		  ,'Memo'+ cast(@count as varchar),getdate())
	select @count = @count + 1	
  end


下面给出本控件完整代码

原创企业级控件库之大数据量分页控件 
 #region  版权信息
 /*---------------------------------------------------------------------*
 // Copyright (C) 2010 http://www.cnblogs.com/huyong
 // 版权所有。 
 // 项目  名称:《Winform通用控件库》
 // 文  件  名: UcPageControl.cs
 // 类  全  名: DotNet.Controls.UcPageControl 
 // 描      述:  分页控件
 // 创建  时间: 2010-06-05
 // 创建人信息: [**** 姓名:胡勇 QQ:80368704 E-Mail:80368704@qq.com *****]
 *----------------------------------------------------------------------*/
 #endregion
 
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Drawing;
 using System.Data;
 using System.Data.SqlClient;
 using System.Windows.Forms;
 using DotNet.Common;
 using DotNet.DBUtility;
 
 namespace DotNet.Controls
 {
     #region 委托申明
     /// <summary>
     /// 申明委托
     /// </summary>
     /// <param name="e"></param>
     /// <returns></returns>
     public delegate int EventPagingHandler(EventPagingArg e);
     #endregion
 
     #region 分页控件
     /// <summary>
     /// 分页控件
     /// 
     /// 修改纪录(此分页控件经过多次修改,已趋于完美,可放心使用。)
     ///     2010-12-06 胡勇 对上一条、下一条、首条、末条数据导航的隐藏,因为控件本身已做了处理。
     ///     2010-12-05 胡勇 对分页控件代码做了相应优化
     ///     2010-06-05 胡勇 创建分页控件
     ///     
     /// <author>
     ///     <name>胡勇</name>
     ///     <QQ>80368704</QQ>
     ///     <Email>80368704@qq.com</Email>
     /// </author>
     /// </summary>
     [ToolboxItem(true)]
     [DefaultEvent("EventPaging")]
     [ToolboxBitmap(typeof(UcPageControl), "DotNet.Controls.Images.UcPageControl.bmp")]
     [Description("分页控件")]
     public partial class UcPageControl : UserControl
     {
         #region 申明事件
         /// <summary>
         /// 单击移动到当前页上一末记录时发生
         /// </summary>
         [Category("数据分页"), Description("单击移动到当前页上一末记录时发生。"),Browsable(false)]
         public event EventHandler OnBindingNavigatorMovePreviousItemClick;
 
         /// <summary>
         /// 单击移动到当前页第一条记录时发生
         /// </summary>
         [Category("数据分页"), Description("单击移动到当前页第一条记录时发生。"), Browsable(false)]
         public event EventHandler OnBindingNavigatorMoveFirstItemClick;
 
         /// <summary>
         /// 单击移动到当前页下一条记录时发生
         /// </summary>
         [Category("数据分页"), Description("单击移动到当前页下一条记录时发生。"), Browsable(false)]
         public event EventHandler OnBindingNavigatorMoveNextItemClick;
 
         /// <summary>
         /// 单击移动到当前页最后一条记录时发生
         /// </summary>
         [Category("数据分页"), Description("单击移动到当前页最后一条记录时发生。"), Browsable(false)]
         public event EventHandler OnBindingNavigatorMoveLastItemClick;
 
         /// <summary>
         /// 单击各分页按钮(上一页、下一页、第一页、最后一页和转到某页)时发生
         /// </summary>
         [Category("数据分页"), Description("分页时发生。")]
         public event EventPagingHandler EventPaging;
         #endregion 
 
         #region 构造函数
         public UcPageControl()
         {
             InitializeComponent();
         }
         #endregion
 
         #region 属性
 
         private int _pageSize    = 50;  //每页显示记录数
         private int _nMax        = 0;   //总记录数
         private int _pageCount   = 0;   //页数=总记录数/每页显示记录数
         private int _pageCurrent = 0;   //当前页号
 
         /// <summary>
         /// 每页显示记录数
         /// </summary>
         [Category("数据分页"), Description("每页显示记录数。"), Browsable(false)]
         public int PageSize
         {
             get 
             { 
                 return _pageSize;
             }
             set
             {
                 _pageSize = value;
                 GetPageCount();//页数
             }
         }              
       
         /// <summary>
         /// 记录总数
         /// </summary>
         [Category("数据分页"), Description("记录总数。"),Browsable(false)]
         public int NMax
         {
             get 
             { 
                 return _nMax; 
             }
             set
             {
                 _nMax = value;
                 GetPageCount();
             }
         }       
 
         /// <summary>
         /// 页数
         /// </summary>
         [Category("数据分页"), Description("页数。"), Browsable(false)]
         public int PageCount
         {
             get 
             { 
                 return _pageCount;
             }
             set 
             { 
                 _pageCount = value; 
             }
         }       
 
         /// <summary>
         /// 当前页号
         /// </summary>
         [Category("数据分页"), Description("当前页号。"), Browsable(false)]
         public int PageCurrent
         {
             get 
             {
                 return _pageCurrent;
             }
             set 
             {
                 _pageCurrent = value; 
             }
         }
         #endregion
 
         #region 方法
         [Category("数据分页"), Description("bindingNavigator。"), Browsable(false)]
         public BindingNavigator ToolBar
         {
             get 
             { 
                 return this.bindingNavigator;
             }
         }
 
         /// <summary>
         /// 得到总页数
         /// </summary>
         private void GetPageCount()
         {
             if (this.NMax > 0)
             {
                 this.PageCount = Convert.ToInt32(Math.Ceiling(Convert.ToDouble(this.NMax) / Convert.ToDouble(this.PageSize)));
             }
             else
             {
                 this.PageCount = 0;
             }
         }
 
         /// <summary>
         /// 绑定分页控件(关键代码)
         /// </summary>
         public void Bind()
         {
             if (this.EventPaging != null)
             {
                 this.NMax = this.EventPaging(new EventPagingArg(this.PageCurrent));
             }
 
             if (this.PageCurrent > this.PageCount)
             {
                 this.PageCurrent = this.PageCount;
             }
             if (this.PageCount == 1)
             {
                 this.PageCurrent = 1;
             }
             lblPageCount.Text = this.PageCount.ToString();
             this.lblMaxPage.Text = "共"+this.NMax.ToString()+"条记录";
             this.txtCurrentPage.Text = this.PageCurrent.ToString();
 
             if (this.PageCurrent == 1)
             {
                 this.btnPrev.Enabled = false;
                 this.btnFirst.Enabled = false;
             }
             else
             {
                 btnPrev.Enabled = true;
                 btnFirst.Enabled = true;
             }
 
             if (this.PageCurrent == this.PageCount)
             {
                 this.btnLast.Enabled = false;
                 this.btnNext.Enabled = false;
             }
             else
             {
                 btnLast.Enabled = true;
                 btnNext.Enabled = true;
             }
 
             if (this.NMax == 0)
             {
                 btnNext.Enabled = false;
                 btnLast.Enabled = false;
                 btnFirst.Enabled = false;
                 btnPrev.Enabled = false;
             }
         }
 
         #endregion
 
         #region 按钮事件
         private void btnFirst_Click(object sender, EventArgs e)
         {
             PageCurrent = 1;
             this.Bind();
         }
 
         private void btnPrev_Click(object sender, EventArgs e)
         {
             PageCurrent -= 1;
             if (PageCurrent <= 0)
             {
                 PageCurrent = 1;
             }
             this.Bind();
         }
 
         private void btnNext_Click(object sender, EventArgs e)
         {
             this.PageCurrent += 1;
             if (PageCurrent > PageCount)
             {
                 PageCurrent = PageCount;
             }
             this.Bind();
         }
 
         private void btnLast_Click(object sender, EventArgs e)
         {
             PageCurrent = PageCount;
             this.Bind();
         }
 
         private void btnGo_Click(object sender, EventArgs e)
         {
             if (this.txtCurrentPage.Text != null && txtCurrentPage.Text != "")
             {
                 if (Int32.TryParse(txtCurrentPage.Text, out _pageCurrent))
                 {
                     this.Bind();
                 }
                 else
                 {
                     DialogHelper.ShowErrorMsg("输入数字格式错误!");
                 }
             }
         }
 
         private void txtCurrentPage_KeyDown(object sender, KeyEventArgs e)
         {
             if (e.KeyCode == Keys.Enter)
             {
                 this.Bind();
             }
         }
 
         private void bindingNavigatorMovePreviousItem_Click(object sender, EventArgs e)
         {
             if(OnBindingNavigatorMovePreviousItemClick != null)
             {
                 OnBindingNavigatorMovePreviousItemClick(this, null);
             }
         }
 
         private void bindingNavigatorMoveFirstItem_Click(object sender, EventArgs e)
         {
             if (OnBindingNavigatorMoveFirstItemClick != null)
             {
                 OnBindingNavigatorMoveFirstItemClick(this, null);
             }
         }
 
         private void bindingNavigatorMoveNextItem_Click(object sender, EventArgs e)
         {
             if (OnBindingNavigatorMoveNextItemClick != null)
             {
                 OnBindingNavigatorMoveNextItemClick(this, null);
             }
         }
 
         private void bindingNavigatorMoveLastItem_Click(object sender, EventArgs e)
         {
             if (OnBindingNavigatorMoveLastItemClick != null)
             {
                 OnBindingNavigatorMoveLastItemClick(this, null);
             }
         }
     #endregion
     }
     #endregion
 
     #region 自定义事件数据基类
     /// <summary>
     /// 自定义事件数据基类
     /// </summary>
     public class EventPagingArg : EventArgs
     {
         private int _intPageIndex;
         public EventPagingArg(int PageIndex)
         {
             _intPageIndex = PageIndex;
         }
     }
     #endregion
 
     #region 数据源提供(PageData)
     /// <summary>
     /// 数据源提供
     /// </summary>
     public class PageData
     {
         DataSet ds                         = null;
         private int    _PageSize           = 50;           //分页大小
         private int    _PageIndex          = 1;            //当前页
         private int    _PageCount          = 0;            //总页数
         private int    _TotalCount         = 0;            //总记录数
         private string _QueryFieldName     = "*";          //表字段FieldStr
         private bool   _isQueryTotalCounts = true;         //是否查询总的记录条数
         private string _TableName          = string.Empty; //表名        
         private string _OrderStr           = string.Empty; //排序_SortStr
         private string _QueryCondition     = string.Empty; //查询的条件 RowFilter
         private string _PrimaryKey         = string.Empty; //主键
 
         /// <summary>
         /// 是否查询总的记录条数
         /// </summary>
         public bool IsQueryTotalCounts
         {
             get { return _isQueryTotalCounts; }
             set { _isQueryTotalCounts = value; }
         }
 
         /// <summary>
         /// 分页大小(每页显示多少条数据)
         /// </summary>
         public int PageSize
         {
             get
             {
                 return _PageSize;
 
             }
             set
             {
                 _PageSize = value;
             }
         }
 
         /// <summary>
         /// 当前页
         /// </summary>
         public int PageIndex
         {
             get
             {
                 return _PageIndex;
             }
             set
             {
                 _PageIndex = value;
             }
         }
 
         /// <summary>
         /// 总页数
         /// </summary>
         public int PageCount
         {
             get
             {
                 return _PageCount;
             }
         }
 
         /// <summary>
         /// 总记录数
         /// </summary>
         public int TotalCount
         {
             get
             {
                 return _TotalCount;
             }
         }
 
         /// <summary>
         /// 表名或视图名
         /// </summary>
         public string TableName
         {
             get
             {
                 return _TableName;
             }
             set
             {
                 _TableName = value;
             }
         }
 
         /// <summary>
         /// 表字段FieldStr
         /// </summary>
         public string QueryFieldName
         {
             get
             {
                 return _QueryFieldName;
             }
             set
             {
                 _QueryFieldName = value;
             }
         }
 
         /// <summary>
         /// 排序字段
         /// </summary>
         public string OrderStr
         {
             get
             {
                 return _OrderStr;
             }
             set
             {
                 _OrderStr = value;
             }
         }
 
         /// <summary>
         /// 查询条件
         /// </summary>
         public string QueryCondition
         {
             get
             {
                 return _QueryCondition;
             }
             set
             {
                 _QueryCondition = value;
             }
         }
 
         /// <summary>
         /// 主键
         /// </summary>
         public string PrimaryKey
         {
             get 
             {
                 return _PrimaryKey;
             }
             set 
             {
                 _PrimaryKey = value;
             }
         }
 
         /// <summary>
         /// 得到分页数据
         /// </summary>
         /// <param name="connectionstring">连接字符串</param>
         /// <returns>DataSet</returns>
         public DataSet QueryDataTable(string connectionstring)
         {
             SqlParameter[] parameters = {
                     new SqlParameter("@Tables",      SqlDbType.VarChar,  255),
                     new SqlParameter("@PrimaryKey" , SqlDbType.VarChar , 255),    
                     new SqlParameter("@Sort",        SqlDbType.VarChar , 255),
                     new SqlParameter("@CurrentPage", SqlDbType.Int          ),
                     new SqlParameter("@PageSize",    SqlDbType.Int          ),                                    
                     new SqlParameter("@Fields",      SqlDbType.VarChar,  255),
                     new SqlParameter("@Filter",      SqlDbType.VarChar,  1000),
                     new SqlParameter("@Group" ,      SqlDbType.VarChar,  1000)
                     };
             parameters[0].Value = _TableName;
             parameters[1].Value = _PrimaryKey;
             parameters[2].Value = _OrderStr;
             parameters[3].Value = PageIndex;
             parameters[4].Value = PageSize;
             parameters[5].Value =_QueryFieldName;
             parameters[6].Value = _QueryCondition;
             parameters[7].Value = string.Empty;
             ds = null;
             ds = new DataSet();
             ds = DbHelperSQL.RunProcedure(connectionstring, "uspDividePage", parameters, "tbPageData");
 
             if (_isQueryTotalCounts)
             {
                 _TotalCount = GetTotalCount(connectionstring);
             }
 
             if (_TotalCount == 0)
             {
                 _PageIndex = 0;
                 _PageCount = 0;
             }
             else
             {
                 _PageCount = _TotalCount % _PageSize == 0 ? _TotalCount / _PageSize : _TotalCount / _PageSize + 1;
 
                 if (_PageIndex > _PageCount)
                 {
                     _PageIndex = _PageCount;
                     parameters[4].Value = _PageSize;
                     ds = QueryDataTable(connectionstring);
                 }
             }
 
             return ds;
         }
 
         /// <summary>
         /// 得到总的记录数
         /// </summary>
         /// <param name="connectionstring">连接字符串</param>
         /// <returns>总的记录数</returns>
         public int GetTotalCount(string connectionstring)
         {
             string strSql = " select count(1) from "+_TableName;
 
             if (_QueryCondition != string.Empty)
             {
                 strSql += " where " + _QueryCondition;
             }
 
             return Convert.ToInt32(DbHelperSQL.GetSingle(strSql.ToString(), connectionstring));
         }
     }
     #endregion
 }


 

© 2010  EricHu

原创作品,转贴请注明作者和出处,留此信息。


------------------------------------------------

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