SQL 拆分函数和排序问题？

Question

我有以下 Split功能，

ALTER FUNCTION [dbo].[Split](@String varchar(8000), @Delimiter char(1))     
                returns @temptable TABLE (items varchar(8000))     
            as     
            begin
                set @String = RTRIM(LTRIM(@String))
                declare @idx int     
                declare @slice varchar(8000)     

                select @idx = 1     
                    if len(@String)<1 or @String is null  return     

                while @idx!= 0     
                begin     
                    set @idx = charindex(@Delimiter,@String)     
                    if @idx!=0     
                        set @slice = left(@String,@idx - 1)     
                    else     
                        set @slice = @String     

                    if(len(@slice)>0)
                        insert into @temptable(Items) values(@slice)     

                    set @String = right(@String,len(@String) - @idx)     
                    if len(@String) = 0 break     
                end 
            return     
            end

我写的时候，

SELECT Items 
FROM Split('around the home,clean and protect,soaps and air fresheners,air fresheners',',')

这会给我，

air fresheners
around the home
clean and protect
soaps and air fresheners

我需要维持秩序。

Answer 1

一个更简单的函数:

CREATE FUNCTION dbo.SplitStrings_Ordered
(
    @List       nvarchar(MAX),
    @Delimiter  nvarchar(255)
)
RETURNS TABLE
AS
RETURN 
(
  SELECT [Index] = CHARINDEX(@Delimiter, @List + @Delimiter, Number),
         Item = SUBSTRING(@List, Number, CHARINDEX(@Delimiter, 
                @List + @Delimiter, Number) - Number)
    FROM 
    (
      SELECT ROW_NUMBER() OVER (ORDER BY [object_id]) FROM sys.all_objects
    ) AS n(Number)
    WHERE Number <= CONVERT(INT, LEN(@List))
    AND SUBSTRING(@Delimiter + @List, Number, LEN(@Delimiter)) = @Delimiter
);
GO

示例用法:

DECLARE @s nvarchar(MAX) = N',around the home,clean and protect,soaps and air'
  + ' fresheners,air fresheners';

SELECT Item FROM dbo.SplitStrings_Ordered(@s, N',') ORDER BY [Index];

或者从按输入排序的表中返回订单:

SELECT o.OrderID
  FROM dbo.Orders AS o
  INNER JOIN dbo.SplitStrings_Ordered('123,789,456') AS f
  ON o.OrderID = CONVERT(int, f.Item)
  ORDER BY f.[Index];