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_splitstr(
@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 function 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