sqlserver中字符串切割函数总结

ALTER FUNCTION [dbo].[Split]
(
@Array VARCHAR(7000)
,@Split CHAR(1)
)
RETURNS @T TABLE(v VARCHAR(100))
AS
BEGIN
WHILE(CHARINDEX(@Split,@Array)<>0)
BEGIN
INSERT @T VALUES(SUBSTRING(@Array,1,CHARINDEX(@Split,@Array)-1));
SET @Array=STUFF(@Array,1,CHARINDEX(@Split,@Array),'');
END
INSERT @T VALUES(@Array);
RETURN;
END;

CREATE FUNCTION dbo.f_str(
@str varchar(8000)
)RETURNS @r TABLE(id int IDENTITY(1, 1), value varchar(5000))
AS
BEGIN
/* Function body */
DECLARE @pos int
SET @pos = CHARINDEX(',', @str)
WHILE @pos > 0
BEGIN
INSERT @r(value) VALUES(LEFT(@str, @pos - 1))
SELECT
@str = STUFF(@str, 1, @pos, ''),
@pos = CHARINDEX(',', @str)
END
IF @str > ''
INSERT @r(value) VALUES(@str)
RETURN

END

select * from f_splitstr('中,国,人')

CREATE Get_StrArrayLength
(
@str varchar(1024), --要分割的字符串
@split varchar(10) --分隔符号
)
returns int
as
begin
declare @location int
declare @start int
declare @length int

set @str=ltrim(rtrim(@str))
set @location=charindex(@split,@str)
set @length=1
while @location<>0
begin
set @start=@location+1
set @location=charindex(@split,@str,@start)
set @length=@length+1
end
return @length
end
调用示例：select dbo.Get_StrArrayLength('78,1,2,3',',')
返回值：4

CREATE function Get_StrArrayStrOfIndex
(
@str varchar(1024), --要分割的字符串
@split varchar(10), --分隔符号
@index int --取第几个元素
)
returns varchar(1024)
as
begin
declare @location int
declare @start int
declare @next int
declare @seed int

set @str=ltrim(rtrim(@str))
set @start=1
set @next=1
set @seed=len(@split)

set @location=charindex(@split,@str)
while @location<>0 and @index>@next
begin
set @start=@location+@seed
set @location=charindex(@split,@str,@start)
set @next=@next+1
end
if @location =0 select @location =len(@str)+1
--这儿存在两种情况：1、字符串不存在分隔符号 2、字符串中存在分隔符号，跳出while循环后，@location为0，那默认为字符串后边有一个分隔符号。

return substring(@str,@start,@location-@start)
end