Sql server存儲(chǔ)過(guò)程和C#分頁(yè)類簡(jiǎn)化你的代碼

2019-11-18 19:02:31

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Sqlserver存儲(chǔ)過(guò)程和C#分頁(yè)類簡(jiǎn)化你的代碼!
在最近的項(xiàng)目中，由于要用到自定義分頁(yè)的功能，本人就在網(wǎng)上找了個(gè)存儲(chǔ)過(guò)程。結(jié)合C#寫了個(gè)分頁(yè)類。由于本人第一次寫文章。寫得不好，大家不要扔雞蛋。。

下面是存儲(chǔ)過(guò)程（sqlserver2000下通過(guò))

--最通用的分頁(yè)存儲(chǔ)過(guò)程
-- 獲取指定頁(yè)的數(shù)據(jù)

CREATE PROCEDURE Pagination

@tblName   varchar(255),       -- 表名

@strGetFields varchar(1000) = '*', -- 需要返回的列

@fldName varchar(255)='',      -- 排序的字段名

@PageSize   int = 10,          -- 頁(yè)尺寸

@PageIndex int = 1,           -- 頁(yè)碼

@doCount bit = 0,   -- 返回記錄總數(shù), 非 0 值則返回

@OrderType bit = 0, -- 設(shè)置排序類型, 非 0 值則降序

@strWhere varchar(1500) = '' -- 查詢條件 (注意: 不要加 where)

AS

declare @strSQL   varchar(5000)       -- 主語(yǔ)句

declare @strTmp   varchar(110)        -- 臨時(shí)變量

declare @strOrder varchar(400)        -- 排序類型

if @doCount != 0

begin

   if @strWhere !=''

   set @strSQL = 'select count(*) as Total from ['+ @tblName +'] where '+ @strWhere

   else

   set @strSQL = 'select count(*) as Total from ['+ @tblName +']'

end

--以上代碼的意思是如果@doCount傳遞過(guò)來(lái)的不是0，就執(zhí)行總數(shù)統(tǒng)計(jì)。以下的所有代碼都
--是@doCount為0的情況

else

begin

if @OrderType != 0

begin

   set @strTmp = '<(select min'

set @strOrder = ' order by ['+ @fldName +'] desc'

--如果@OrderType不是0，就執(zhí)行降序，這句很重要！

end

else

begin

   set @strTmp = '>(select max'

   set @strOrder = ' order by ['+ @fldName +'] asc'

end

if @PageIndex = 1

begin

   if @strWhere != ''

    set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from ['+ @tblName +'] where ' + @strWhere + ' ' + @strOrder

    else

    set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from ['+ @tblName +'] '+ @strOrder

--如果是第一頁(yè)就執(zhí)行以上代碼，這樣會(huì)加快執(zhí)行速度

end

else

begin

--以下代碼賦予了@strSQL以真正執(zhí)行的SQL代碼

set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from [' + @tblName +'] where [' + @fldName + ']' + @strTmp + '(['+ @fldName + '])
from (select top ' + str((@PageIndex-1)*@PageSize) + ' ['+ @fldName + '] from ['+ @tblName +']' + @strOrder + ') as tblTmp)'+ @strOrder

if @strWhere != ''

   set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ ' from ['+ @tblName +'] where [' + @fldName + ']' + @strTmp + '(['+ @fldName + ']) from (select top ' + str((@PageIndex-1)*@PageSize) + ' ['+ @fldName + ']
from ['+ @tblName +'] where ' + @strWhere + ' ' + @strOrder + ') as tblTmp) and ' + @strWhere + ' ' + @strOrder

end

end

exec ( @strSQL)
GO

下面是C#的代碼

using System.Data ;
using System.Data.SqlClient ;
using Microsoft.applicationBlocks.Data ;
using System.Web ;
using System.Web.UI ;
namespace rssLayer.PageHelper
{
    /**//// <summary>
    /// 分頁(yè)類PagerHelper 的摘要說(shuō)明。
    /// </summary>
    public class PagerHelper
    {
        private string connectionString;



        public PagerHelper(string tblname,string sortname,bool docount,string connectionString)
        {
            this.tblName = tblname;
            this.fldName = sortname ;
            this.connectionString = connectionString ;
            this.docount = docount;
        }

        public PagerHelper(string tblname,bool docount,
            string strGetFields,    string fldName,int pagesize,
            int pageindex,bool ordertype,string strwhere,string connectionString
            )
        {
            this.tblName = tblname ;
            this.docount = docount ;
            this.strGetFields = strGetFields ;
            this.fldName = fldName;
            this.pagesize = pagesize ;
            this.pageindex = pageindex;
            this.ordertype = ordertype ;
            this.strwhere = strwhere ;
            this.connectionString = connectionString ;

        }

        /**//// <summary>
        /// 得到記錄集的構(gòu)造函數(shù)
        /// </summary>
        /// <param name="tblname"></param>
        /// <param name="strwhere"></param>
        /// <param name="connectionString"></param>
        public PagerHelper(string tblname,string strwhere,string connectionString)
        {
            this.tblName = tblname;
            this.strwhere = strwhere ;
            this.docount = true;
            this.connectionString = connectionString ;
        }

        private string tblName;
        public string TblName
        {
            get{return tblName;}
            set{tblName =value;}
        }

        private string strGetFields="*";
        public string StrGetFields
        {
            get{return strGetFields ;}
            set{strGetFields =value;}
        }

        private string fldName=string.Empty;
        public string FldName
        {
            get{return fldName ;}
            set{fldName =value;}
        }



        private int pagesize =10;
        public int PageSize
        {
            get{return pagesize ;}
            set{pagesize =value;}
        }

        private int pageindex =1;
        public int PageIndex
        {
            get{return pageindex ;}
            set{pageindex =value;}
        }

        private bool docount=false;
        public bool DoCount
        {
            get{return docount ;}
            set{docount =value;}
        }

        private bool ordertype=false;
        public bool OrderType
        {
            get{return ordertype ;}
            set{ordertype =value;}
        }

        private string strwhere=string.Empty ;
        public string StrWhere
        {
            get{return strwhere ;}
            set{strwhere =value;}
        }





        public IDataReader GetDataReader()
        {

            if(this.docount)
            {
                throw new ArgumentException("要返回記錄集，DoCount屬性一定為false");
            }



        //    System.Web.HttpContext.Current.Response.Write(pageindex);

            return SqlHelper.ExecuteReader(connectionString,CommandType.StoredProcedure,"Pagination",
                new SqlParameter("@tblName",this.tblName),
                new SqlParameter("@strGetFields",this.strGetFields),
                new SqlParameter("@fldName",this.fldName),
                new SqlParameter("@PageSize",this.pagesize),
                new SqlParameter("@PageIndex",this.pageindex),
                new SqlParameter("@doCount",this.docount),
                new SqlParameter("@OrderType",this.ordertype),
                new SqlParameter("@strWhere",this.strwhere)
                );
        }

        public DataSet GetDataSet()
        {
            if(this.docount)
            {
                throw new ArgumentException("要返回記錄集，DoCount屬性一定為false");
            }

            return SqlHelper.ExecuteDataset(connectionString,CommandType.StoredProcedure,"Pagination",
                new SqlParameter("@tblName",this.tblName),
                new SqlParameter("@strGetFields",this.strGetFields),
                new SqlParameter("@fldName",this.fldName),
                new SqlParameter("@PageSize",this.pagesize),
                new SqlParameter("@PageIndex",this.pageindex),
                new SqlParameter("@doCount",this.docount),
                new SqlParameter("@OrderType",this.ordertype),
                new SqlParameter("@strWhere",this.strwhere)
                );
        }

        public int GetCount()
        {
            if(!this.docount)
            {
                throw new ArgumentException("要返回總數(shù)統(tǒng)計(jì)，DoCount屬性一定為true");
            }



            return (int)SqlHelper.ExecuteScalar(connectionString,CommandType.StoredProcedure,"Pagination",
                new SqlParameter("@tblName",this.tblName),
                new SqlParameter("@strGetFields",this.strGetFields),
                new SqlParameter("@fldName",this.fldName),
                new SqlParameter("@PageSize",this.pagesize),
                new SqlParameter("@PageIndex",this.pageindex),
                new SqlParameter("@doCount",this.docount),
                new SqlParameter("@OrderType",this.ordertype),
                new SqlParameter("@strWhere",this.strwhere)
                );
        }

    }



}

如何調(diào)用？？？

假如我已經(jīng)建立了2個(gè)類。一個(gè)是FavList數(shù)據(jù)庫(kù)實(shí)體類，一個(gè)FavListCollection集合類。FavListCollection存儲(chǔ)了FavList實(shí)體類的集合。

我可以這樣寫一個(gè)方法。

/**//// <summary>
        /// 返回FavList集合,使用存儲(chǔ)過(guò)程自定義分頁(yè)。
        /// </summary>
        /// <param name="userid">數(shù)據(jù)庫(kù)FavList的字段，用戶ID</param>
        /// <param name="strwhere">查找的條件</param>
        /// <param name="ordertype">排序，true表示Desc,false表示asc</param>
        /// <param name="fldname">排序的字段，只能是一個(gè)字段</param>
        /// <param name="pagesize">每頁(yè)的記錄數(shù)</param>
        /// <param name="pageindex">到第幾頁(yè)的參數(shù)，由1開始。1表示第一頁(yè)，以此類推。</param>
        /// <param name="recordcount">總記錄數(shù)。</param>
        /// <returns></returns>
        public override FavListCollection GetFavListsByUser(int userid, string strwhere,
            bool ordertype, string fldname, int pagesize,
            int pageindex,out int recordcount
            )
        {
            recordcount = 0;
            PagerHelper helper = new PagerHelper("Vfavlist",strwhere,ConnectionString); //VFavList是View
            recordcount = helper.GetCount();

            PagerHelper helper2 = new PagerHelper("Vfavlist",false," * ",fldname,
                pagesize,pageindex,ordertype,strwhere,ConnectionString);

            IDataReader dr = helper2.GetDataReader();

            FavListCollection list = new FavListCollection();

            while(dr.Read())
            {
                list.Add(PopulateFavList(dr));
            }

            dr.Close();

            return list;
        }
DataGrid調(diào)用就不用說(shuō)了吧。。