Sql Server字符串拆分(Split)方法汇总

时间:2023-10-13 16:21:32
详细链接:https://shop499704308.taobao.com/?spm=a1z38n.10677092.card.11.594c1debsAGeak
--方法0:动态SQL法
declare @s varchar(),@sql varchar()
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) --方法1:循环截取法
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 CREATE FUNCTION f_splitSTR(
@s varchar(), --待分拆的字符串
@split varchar() --数据分隔符
)RETURNS @re TABLE(col varchar())
AS
BEGIN
DECLARE @splitlen int
SET @splitlen=LEN(@split+'a')-
WHILE CHARINDEX(@split,@s)>
BEGIN
INSERT @re VALUES(LEFT(@s,CHARINDEX(@split,@s)-))
SET @s=STUFF(@s,,CHARINDEX(@split,@s)+@splitlen,'')
END
INSERT @re VALUES(@s)
RETURN
END
GO --方法2:使用临时性分拆辅助表法
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 CREATE FUNCTION f_splitSTR(
@s varchar(), --待分拆的字符串
@split varchar() --数据分隔符
)RETURNS @re TABLE(col varchar())
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 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 --方法3:使用永久性分拆辅助表法
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')=)
drop table [dbo].[tb_splitSTR]
GO --字符串分拆辅助表
SELECT TOP ID=IDENTITY(int,,) 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(), --待分拆的字符串
@split varchar() --数据分隔符
)RETURNS TABLE
AS
RETURN(
SELECT col=CAST(SUBSTRING(@s,ID,CHARINDEX(@split,@s+@split,ID)-ID) as varchar())
FROM tb_splitSTR
WHERE ID<=LEN(@s+'a')
AND CHARINDEX(@split,@split+@s,ID)=ID)
GO --方法4:循环字符串分割
create FUNCTION [dbo].[Fun_SplitStr]
(
@originalStr VARCHAR(), --要分割的字符串
@split varchar() --分隔符号
)
RETURNS @temp TABLE(Result VARCHAR())
AS
BEGIN
DECLARE @result AS VARCHAR(); --定义变量用于接收单个结果 SET @originalStr = @originalStr + @split ; WHILE (@originalStr <> '')
BEGIN
SET @result = LEFT(@originalStr, CHARINDEX(@split, @originalStr, ) -) ; INSERT @temp VALUES(@result) ; --STUFF()函数用于删除指定长度的字符,并可以在指定的起点处插入另一组字符。
SET @originalStr = STUFF(@originalStr, , CHARINDEX(@split, @originalStr, ), '');
END
RETURN END --方法5:利用sql server2005的OUTER APPLY CREATE FUNCTION [dbo].[ufn_SplitStringToTable]
(
@str VARCHAR(MAX) ,
@split VARCHAR()
)
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
)