Sql server存储过程和C#分页类简化你的代码

2024-07-21 02:29:47

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sqlserver存储过程和c#分页类简化你的代码!
在最近的项目中，由于要用到自定义分页的功能，本人就在网上找了个存储过程。结合c#写了个分页类。由于本人第一次写文章。写得不好，大家不要扔鸡蛋。。

下面是存储过程（sqlserver2000下通过)

--最通用的分页存储过程
-- 获取指定页的数据

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,          -- 页尺寸

@pageindex int = 1,           -- 页码

@docount bit = 0,   -- 返回记录总数, 非 0 值则返回

@ordertype bit = 0, -- 设置排序类型, 非 0 值则降序

@strwhere varchar(1500) = '' -- 查询条件 (注意: 不要加 where)

as

declare @strsql   varchar(5000)       -- 主语句

declare @strtmp   varchar(110)        -- 临时变量

declare @strorder varchar(400)        -- 排序类型

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

--以上代码的意思是如果@docount传递过来的不是0，就执行总数统计。以下的所有代码都
--是@docount为0的情况

else

begin

if @ordertype != 0

begin

   set @strtmp = '<(select min'

set @strorder = ' order by ['+ @fldname +'] desc'

--如果@ordertype不是0，就执行降序，这句很重要！

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

--如果是第一页就执行以上代码，这样会加快执行速度

end

else

begin

--以下代码赋予了@strsql以真正执行的sql代码

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#的代码

using system.data ;
using system.data.sqlclient ;
using microsoft.applicationblocks.data ;
using system.web ;
using system.web.ui ;
namespace rsslayer.pagehelper
{
    /**//// <summary>
    /// 分页类pagerhelper 的摘要说明。
    /// </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>
        /// 得到记录集的构造函数
        /// </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("要返回记录集，docount属性一定为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("要返回记录集，docount属性一定为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("要返回总数统计，docount属性一定为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)
                );
        }

    }



}

如何调用？？？

假如我已经建立了2个类。一个是favlist数据库实体类，一个favlistcollection集合类。favlistcollection存储了favlist实体类的集合。

我可以这样写一个方法。

/**//// <summary>
        /// 返回favlist集合,使用存储过程自定义分页。
        /// </summary>
        /// <param name="userid">数据库favlist的字段，用户id</param>
        /// <param name="strwhere">查找的条件</param>
        /// <param name="ordertype">排序，true表示desc,false表示asc</param>
        /// <param name="fldname">排序的字段，只能是一个字段</param>
        /// <param name="pagesize">每页的记录数</param>
        /// <param name="pageindex">到第几页的参数，由1开始。1表示第一页，以此类推。</param>
        /// <param name="recordcount">总记录数。</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调用就不用说了吧。。