sqlserver字符串拆分(split)方法汇总(转载并仔细学习)

sqlserver字符串拆分(split)方法汇总

--方法0：动态SQL法

declare @s varchar(100),@sql varchar(1000)

set @s='1,2,3,4,5,6,7,8,9,10'

set @sql='select col='''+ replace(@s,',',''' union all select ''')+''''

PRINT @sql

exec (@sql)

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_splitSTR]') and xtype in (N'FN', N'IF', N'TF'))

drop function [dbo].[f_splitSTR]

GO

--方法1：循环截取法

CREATE FUNCTION f_splitSTR(

@s varchar(8000), --待分拆的字符串

@split varchar(10) --数据分隔符

)RETURNS @re TABLE(col varchar(100))

AS

BEGIN

DECLARE @splitlen int

SET @splitlen=LEN(@split+'a')-2

WHILE CHARINDEX(@split,@s)>0

BEGIN

INSERT @re VALUES(LEFT(@s,CHARINDEX(@split,@s)-1))

SET @s=STUFF(@s,1,CHARINDEX(@split,@s)+@splitlen,'')

END

INSERT @re VALUES(@s)

RETURN

END

GO

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_splitSTR]') and xtype in (N'FN', N'IF', N'TF'))

drop function [dbo].[f_splitSTR]

GO

--方法2：使用临时性分拆辅助表法

CREATE FUNCTION f_splitSTR(

@s varchar(8000), --待分拆的字符串

@split varchar(10) --数据分隔符

)RETURNS @re TABLE(col varchar(100))

AS

BEGIN

--创建分拆处理的辅助表(用户定义函数中只能操作表变量)

DECLARE @t TABLE(ID int IDENTITY,b bit)

INSERT @t(b) SELECT TOP 8000 0 FROM syscolumns a,syscolumns b

INSERT @re SELECT SUBSTRING(@s,ID,CHARINDEX(@split,@s+@split,ID)-ID)

FROM @t

WHERE ID<=LEN(@s+'a')

AND CHARINDEX(@split,@split+@s,ID)=ID

RETURN

END

GO

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_splitSTR]') and xtype in (N'FN', N'IF', N'TF'))

drop function [dbo].[f_splitSTR]

GO

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[tb_splitSTR]') and objectproperty(id,N'IsUserTable')=1)

drop table [dbo].[tb_splitSTR]

GO

--方法3：使用永久性分拆辅助表法

--字符串分拆辅助表

SELECT TOP 8000 ID=IDENTITY(int,1,1) INTO dbo.tb_splitSTR

FROM syscolumns a,syscolumns b

GO

--字符串分拆处理函数

CREATE FUNCTION f_splitSTR(

@s varchar(8000), --待分拆的字符串

@split varchar(10) --数据分隔符

)RETURNS TABLE

AS

RETURN(

SELECT col=CAST(SUBSTRING(@s,ID,CHARINDEX(@split,@s+@split,ID)-ID) as varchar(100))

FROM tb_splitSTR

WHERE ID<=LEN(@s+'a')

AND CHARINDEX(@split,@split+@s,ID)=ID)

GO

--方法4：利用sql server2005的OUTER APPLY

CREATE FUNCTION [dbo].[ufn_SplitStringToTable]

(

@str VARCHAR(MAX) ,

@split VARCHAR(10)

)

RETURNS TABLE

AS

RETURN

( SELECT B.id

FROM ( SELECT [value] = CONVERT(XML , '<v>' + REPLACE(@str , @split , '</v><v>')

+ '</v>')

) A

OUTER APPLY ( SELECT id = N.v.value('.' , 'varchar(100)')

FROM A.[value].nodes('/v') N ( v )

) B

)

备注说明：

方法4必须在sql server2005下才可以运行