使用存储过程分页

USE [OA]
GO
/****** Object:  StoredProcedure [dbo].[spGetByPage]    Script Date: 11/05/2014 13:01:37 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[spGetByPage]
(
@tblName   varchar(255),       -- 表名

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

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

@PageSize   int = 5,          -- 页尺寸

@PageIndex  int = 1,           -- 页码

@doCount  bit = 5,   -- 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)='1=1'  -- 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) +' '+@strGetFields+ '  from ' + @tblName + ' where ' + @strWhere + ' ' + @strOrder

     else

     set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ '  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) +' '+@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)

C#调用

  /// <summary>
        /// get balanceServers by page
        /// </summary>
        /// <param name="pageSize"></param>
        /// <param name="pageIndex"></param>
        /// <param name="totalCount"></param>
        /// <returns></returns>
        public List<BalanceServers> GetBalanceServerByPage(int pageSize, int pageIndex, out int totalCount)
        {
            List<BalanceServers> balanceList = null;
            totalCount = 0;
            string sp = "spGetByPage";
            SqlParameter[] spPage ={
                                    new SqlParameter("@tblName","BalanceServers"),
                                    new SqlParameter("@strGetFields","*"),
                                    new SqlParameter("@fldName","Guid"),
                                    new SqlParameter("@PageSize",pageSize),
                                    new SqlParameter("@PageIndex",pageIndex),
                                    new SqlParameter("@doCount",0),
                                    new SqlParameter("@OrderType",0)                                
                                };try
            {
          using (SqlDataReader reader = SqlHelper.ExecuteReader(conn, CommandType.StoredProcedure, sp, spPage))
                {

                    balanceList = CBO.FillCollection<BalanceServers>(reader);
                }
            }
            catch (Exception ex)
            {

                log.Info("Error:" + ex);

            }
            return balanceList;
        }

  public static List<T> FillCollection<T>(SqlDataReader reader) where T : class, new()
        {
            List<T> tlist = new List<T>() ;

            while (reader.Read())
            {
                if (tlist == null)
                    tlist = new List<T>();

                T t = new T();
                foreach (PropertyInfo p in t.GetType().GetProperties())
                {
                    try
                    {
                        object coloumnValue = reader[p.Name];
                        Type objDataType = coloumnValue.GetType();
                        if (coloumnValue == null || coloumnValue == DBNull.Value)
                        {
                            p.SetValue(t, Null.SetNull(p), null);
                        }
                        else
                        {
                            p.SetValue(t, coloumnValue, null);
                        }
                    }
                    catch (Exception)
                    {
                    }
                }
                tlist.Add(t);
            }
            return tlist;
        }