分页存储过程

在圈子里的找了一个分页存储过程，

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

CREATE PROCEDURE [dbo].[Proc_Page]
(
     @TableName varchar(50),            --表名或视图
     @ReFieldsStr varchar(200) = '*',   --字段名(全部字段为*)
     @OrderFiled varchar(200),         --排序字段(必须!支持多字段不用加order by)
     @OrderType int = 0,                -- 设置排序类型, 非0 值则降序
     @WhereString varchar(500) =N'',  --条件语句(不用加where)
     @PageSize int,                     --每页多少条记录
     @PageIndex int = 1 ,               --指定当前为第几页
     @TotalRecord int output            --返回总记录数
)
AS
 
BEGIN    

    --处理开始点和结束点
    Declare @StartRecord int;
    Declare @EndRecord int; 
    Declare @TotalCountSql nvarchar(500); 
    Declare @SqlString nvarchar(2000);    
    set @StartRecord = (@PageIndex-1)*@PageSize + 1
    set @EndRecord = @StartRecord + @PageSize - 1 
    SET @TotalCountSql= N'select @TotalRecord = count(*) from [' + @TableName+']';--总记录数语句
    IF @OrderType!=0 --降序
    BEGIN 
    SET @SqlString = N'(select row_number() over (order by '+ @OrderFiled +' desc) as rowId,'+@ReFieldsStr+' from ['+ @TableName+']';--查询语句
    END 
    ELSE 
    BEGIN 
    SET @SqlString = N'(select row_number() over (order by '+ @OrderFiled +' asc) as rowId,'+@ReFieldsStr+' from ['+ @TableName+']';--查询语句
    END 
    --
    IF (@WhereString! = '' or @WhereString!=null)
        BEGIN
            SET @TotalCountSql=@TotalCountSql + '  where '+ @WhereString;
            SET @SqlString =@SqlString+ '  where '+ @WhereString;            
        END
    --第一次执行得到
    --IF(@TotalRecord is null)
    --   BEGIN
           EXEC sp_executesql @totalCountSql,N'@TotalRecord int out',@TotalRecord output;--返回总记录数
    --  END
    ----执行主语句
    set @SqlString ='select * from ' + @SqlString + ') as t where rowId between ' + ltrim(str(@StartRecord)) + ' and ' +  ltrim(str(@EndRecord));
    Exec(@SqlString)    
END
    

EXEC dbo.Proc_Page
    @TableName = 'Afagouinfo', -- varchar(50)
    @ReFieldsStr = 'diqu,flag', -- varchar(200)
    @OrderFiled = 'id', -- varchar(200)
    @OrderType = 0, -- int
    @WhereString = '', -- varchar(500)
    @PageSize = 10, -- int
    @PageIndex = 1, -- int
    @TotalRecord = 20 -- int