SQL SERVER 2008使用CTE转换string到Table
栏目：Sqlserver时间：2014-01-14 11:46:51
多少次我们会面临这样的问题:我们需要把一组ID的Array做为参数传给存储过程.在存储过程中能转换成Table后我们会更喜欢使用这种数据.
这里我们使用CTE来实现，例如我们有这样的字符串：'1,2,4,8'，想转成这个table:
T-sql：
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: Amit Gaur
-- Create date: July 25th 2008
-- Description: Convert a string to a table
-- =============================================
CREATE FUNCTION [dbo].[strToTable]
(
@array varchar(max),
@del char(1)
)
RETURNS
@listTable TABLE
(
item int
)
AS
BEGIN
WITH rep (item,list) AS
(
SELECT SUBSTRING(@array,1,CHARINDEX(@del,@array,1) - 1) as item,
SUBSTRING(@array,CHARINDEX(@del,@array,1) + 1, LEN(@array)) + @del list
UNION ALL
SELECT SUBSTRING(list,1,CHARINDEX(@del,list,1) - 1) as item,
SUBSTRING(list,CHARINDEX(@del,list,1) + 1, LEN(list)) list
FROM rep
WHERE LEN(rep.list) > 0
)
INSERT INTO @listTable
SELECT item FROM rep
RETURN
END
GO
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: Amit Gaur
-- Create date: July 25th 2008
-- Description: Convert a string to a table
-- =============================================
CREATE FUNCTION [dbo].[strToTable]
(
@array varchar(max),
@del char(1)
)
RETURNS
@listTable TABLE
(
item int
)
AS
BEGIN
WITH rep (item,list) AS
(
SELECT SUBSTRING(@array,1,CHARINDEX(@del,@array,1) - 1) as item,
SUBSTRING(@array,CHARINDEX(@del,@array,1) + 1, LEN(@array)) + @del list
UNION ALL
SELECT SUBSTRING(list,1,CHARINDEX(@del,list,1) - 1) as item,
SUBSTRING(list,CHARINDEX(@del,list,1) + 1, LEN(list)) list
FROM rep
WHERE LEN(rep.list) > 0
)
INSERT INTO @listTable
SELECT item FROM rep
RETURN
END
GO
如何调用呢：
1: DECLARE @array VARCHAR(max)
2: SET @array = '1,2,4,8'
3: SELECT item FROM strToTable(@array,',')
完了，实际以前你可以用function递归来实现，这里我们使用CTE．希望这篇POST对您有帮助．
转自：http://wintersun.cnblogs.com
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