T-SQL存储过程：ROW_NUMBER()分页

CREATE   PROCEDURE  GET_MSGLIST
@PageIndex   int = 1 ,
@PageSize   int = 20 ,
@OrderField   nvarchar ( 20 ),
@IsDesc   int = 0
AS
DECLARE   @sql   nvarchar ( 4000 ), @HighSide   int , @LowSide   int , @OrderMark   nvarchar ( 5 );
BEGIN
IF ( @IsDesc = 1 )
BEGIN
     SET   @OrderMark = ' DESC ' ;
END ;
ELSE
BEGIN
     SET   @OrderMark = ' ASC ' ;
END ;
IF ( @PageIndex = 1 )
BEGIN
     SET   @LowSide = 1 ;
     SET   @HighSide = @PageSize ;
END ;
ELSE
BEGIN
     SET   @LowSide = @PageIndex * @PageSize - @PageSize ;
     SET   @HighSide = @PageIndex * @PageSize ;
END ;

SET   @sql = ' select c.* from (select top  ' + cast ( @HighSide   as   nvarchar ) +
     '  ROW_NUMBER() OVER(ORDER BY  ' + @OrderField + '   ' + @OrderMark + ' ) AS RowID,ML.*,MT.[Name],MT.Description  ' +
     ' FROM MsgList ML INNER JOIN MsgType MT ON ML.TID=MT.ID) c  ' +
     ' WHERE RowID BETWEEN  ' + cast ( @LowSide   as   nvarchar )  + '  AND  ' + cast ( @HighSide   as   nvarchar );
PRINT ( @sql );
EXEC ( @sql );
END