sqlserver字符串拆分(split)方法汇总

Posted 2020-08-07 Twang

--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)

--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(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

 --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(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

 

转：aierong原创技术随笔  sqlserver字符串拆分(split)方法汇总