大数据量的数据分页2-存储过程

首先创建一个用户控件名称为pager,在控件中拖入bindingNavigator和bindingSource，修改bindingNavigator，加入必要的一些控件。

效果如下：

代码实现如下：

namespace WindowsApp.MyControl
{
    /**//// <summary>
    /// 申明委托
    /// </summary>
    /// <param name="e"></param>
    /// <returns></returns>
    public delegate int EventPagingHandler(EventPagingArg e);
    /**//// <summary>
    /// 分页控件呈现
    /// </summary>
    public partial class Pager : UserControl
    {
        public Pager()
        {
            InitializeComponent();
        }
        public event EventPagingHandler EventPaging;
        /**//// <summary>
        /// 每页显示记录数
        /// </summary>
        private int _pageSize = 20;
        /**//// <summary>
        /// 每页显示记录数
        /// </summary>
        public int PageSize
        {
            get { return _pageSize; }
            set
            {
                _pageSize = value;
                GetPageCount();
            }
        }

        private int _nMax = 0;
        /**//// <summary>
        /// 总记录数
        /// </summary>
        public int NMax
        {
            get { return _nMax; }
            set
            {
                _nMax = value;
                GetPageCount();
            }
        }

        private int _pageCount = 0;
        /**//// <summary>
        /// 页数=总记录数/每页显示记录数
        /// </summary>
        public int PageCount
        {
            get { return _pageCount; }
            set { _pageCount = value; }
        }

        private int _pageCurrent = 0;
        /**//// <summary>
        /// 当前页号
        /// </summary>
        public int PageCurrent
        {
            get { return _pageCurrent; }
            set { _pageCurrent = value; }
        }


        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>
        /// 翻页控件数据绑定的方法
        /// </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;
            }
        }

        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
                {
                    Common.MessageProcess.ShowError("输入数字格式错误！");
                }
            }
        }

    }
    /**//// <summary>
    /// 自定义事件数据基类
    /// </summary>
    public class EventPagingArg : EventArgs
    {
        private int _intPageIndex;
        public EventPagingArg(int PageIndex)
        {
            _intPageIndex = PageIndex;
        }
    }
}

控件功能基本实现。

如何绑定数据呢？

大数量分页，使用存储过程。

这个存储过程是网络上考的。。。。。

ALTER    PROCEDURE SP_Pagination
/**//*
***************************************************************
** 千万数量级分页存储过程 **
***************************************************************
参数说明:
1.Tables :表名称,视图
2.PrimaryKey :主关键字
3.Sort :排序语句，不带Order By 比如：NewsID Desc,OrderRows Asc
4.CurrentPage :当前页码
5.PageSize :分页尺寸
6.Filter :过滤语句，不带Where 
7.Group :Group语句,不带Group By
效果演示：http://www.cn5135.com/_App/Enterprise/QueryResult.aspx
***************************************************************/
(
@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 + '
'
)

使用该存储过陈，得到数据，将数据绑定到数据控件，提供了一个pageData类

/**//// <summary>
    /// 数据源提供
    /// </summary>
    public class PageData
    {
        private int _PageSize = 10;
        private int _PageIndex = 1;
        private int _PageCount = 0;
        private int _TotalCount = 0;
        private string _TableName;//表名
        private string _QueryFieldName = "*";//表字段FieldStr
        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>
        /// 显示页数
        /// </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，包括视图
        /// </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;
            }
        }
        public DataSet QueryDataTable()
        {
            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;
            DataSet ds = DbHelperSQL.RunProcedure("SP_Pagination", parameters, "dd");
            _TotalCount = GetTotalCount();
            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();
                }
            }
            return ds;
        }

        public int GetTotalCount()
        {
            string strSql = " select count(1) from "+_TableName;
            if (_QueryCondition != string.Empty)
            {
                strSql +=" where " + _QueryCondition;
            }
            return int.Parse(DbHelperSQL.GetSingle(strSql).ToString());
        }
    }

好了，在页面放个DATAGRIDVIEW 拖入控件pager

private void ReceiveOrderJLForm_Load(object sender, EventArgs e)
        {
            this.pager1.PageCurrent = 1;
            this.pager1.Bind();
        }
        private int dgvBind()
        {
            WindowsApp.MyControl.PageData pageData = new WindowsApp.MyControl.PageData();
            pageData.TableName = "T_ReceiveOrder";
            pageData.PrimaryKey = "ReceiveOrderID";
            pageData.OrderStr = "ReceiveOrderID desc";
            pageData.PageIndex = this.pager1.PageCurrent;
            pageData.PageSize = this.pager1.PageSize;
            pageData.QueryCondition = _strSql + strWhere.ToString();
            pageData.QueryFieldName = "*";

            this.pager1.bindingSource.DataSource = pageData.QueryDataTable().Tables[0];
            this.pager1.bindingNavigator.BindingSource = pager1.bindingSource;
            dgvReceiveOrder.AutoGenerateColumns = false;
            dgvReceiveOrder.DataSource = this.pager1.bindingSource;
            return pageData.TotalCount;
        }
        private int pager1_EventPaging(WindowsApp.MyControl.EventPagingArg e)
        {
            return dgvBind();
        }

效果如下：