sql 分隔符字符串转换成表以及多行记录列值转换成字符串

--1. 字符串(分隔符分隔组成的字符串)转换成多行记录的表
-- Function
create FUNCTION [dbo].[fn_Split1](
@String nvarchar (max),
@Delimiter nvarchar (10)
)
RETURNS @ValueTable TABLE ([Value] NVARCHAR(max),[id] int)
BEGIN
DECLARE @NextString nvarchar(max),
@Pos int,
@NextPos int,
@CommaCheck nvarchar(1),
@id int

set @id=1

SET @NextString = ''
SET @CommaCheck = right(@String,1)

SET  @String = @String + @Delimiter

SET @Pos = CHARINDEX(@Delimiter,@String)
SET @NextPos = 1

WHILE (@pos <>  0)
BEGIN
SET @NextString = SUBSTRING(@String,1,@Pos - 1)

INSERT INTO @ValueTable ( [Value],[id]) VALUES (@NextString,@id)

SET @String = SUBSTRING(@String,@pos +1,LEN(@String))

SET @NextPos = @Pos
SET @pos  = CHARINDEX(@Delimiter,@String)

set @id = @id +1
END

RETURN
END

GO

--使用

SELECT * FROM dbo.fn_Split1('11111;22222;3333;4444',';');
--结果，列如下
/*
Value	id
----------
11111	1
22222	2
3333	3
4444	4
*/

--2.多行记录某一个列，转换成一个字符串

IF EXISTS(SELECT TOP 1 1 FROM sysobjects WHERE id=OBJECT_ID('fn_GetProductTypeCodeList') AND type='FN')
DROP FUNCTION  fn_GetProductTypeCodeList
GO
CREATE FUNCTION  fn_GetProductTypeCodeList
( @chvReportProductTypeGUID varchar(40))
RETURNS  varchar(max)

AS

BEGIN

declare @chvProductTypeCodeList varchar(max)
set @chvProductTypeCodeList = ''
select @chvProductTypeCodeList = @chvProductTypeCodeList+';'+ ProductTypeCode from p_Report2ProductType
WHERE ReportProductTypeGUID=@chvReportProductTypeGUID
set @chvProductTypeCodeList = stuff(@chvProductTypeCodeList,1,1,'')

return @chvProductTypeCodeList

END
GO

--使用
SELECT dbo.fn_GetProductTypeCodeList(NEWID())
--结果
/*
--多行数据
Value	id
--------------
11111	1
22222	2
3333	3
4444	4
--最后得到
11111;22222;3333;4444

*/