Sql server存儲過程和C#分頁類簡化你的代碼

2024-07-21 02:29:47

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sqlserver存儲過程和c#分頁類簡化你的代碼!
在最近的項目中，由于要用到自定義分頁的功能，本人就在網上找了個存儲過程。結合c#寫了個分頁類。由于本人第一次寫文章。寫得不好，大家不要扔雞蛋。。

下面是存儲過程（sqlserver2000下通過)

--最通用的分頁存儲過程
-- 獲取指定頁的數據

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,          -- 頁尺寸

@pageindex int = 1,           -- 頁碼

@docount bit = 0,   -- 返回記錄總數, 非 0 值則返回

@ordertype bit = 0, -- 設置排序類型, 非 0 值則降序

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

as

declare @strsql   varchar(5000)       -- 主語句

declare @strtmp   varchar(110)        -- 臨時變量

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傳遞過來的不是0，就執行總數統計。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) +' '[email protected]+ ' from ['+ @tblname +'] where ' + @strwhere + ' ' + @strorder

    else

    set @strsql = 'select top ' + str(@pagesize) +' '[email protected]+ ' from ['+ @tblname +'] '+ @strorder

--如果是第一頁就執行以上代碼，這樣會加快執行速度

end

else

begin

--以下代碼賦予了@strsql以真正執行的sql代碼

set @strsql = 'select top ' + str(@pagesize) +' '[email protected]+ ' 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) +' '[email protected]+ ' 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>
    /// 分頁類pagerhelper 的摘要說明。
    /// </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>
        /// 得到記錄集的構造函數
        /// </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("要返回總數統計，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)
                );
        }

    }



}

如何調用？？？

假如我已經建立了2個類。一個是favlist數據庫實體類，一個favlistcollection集合類。favlistcollection存儲了favlist實體類的集合。

我可以這樣寫一個方法。

/**//// <summary>
        /// 返回favlist集合,使用存儲過程自定義分頁。
        /// </summary>
        /// <param name="userid">數據庫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，只能是一個字段</param>
        /// <param name="pagesize">每頁的記錄數</param>
        /// <param name="pageindex">到第幾頁的參數，由1開始。1表示第一頁，以此類推。</param>
        /// <param name="recordcount">總記錄數。</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調用就不用說了吧。。