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


*/