A split table-valued function for SQL server

1  CREATE  FUNCTION  [ dbo ] . [ Fn_Split ] 
2  (
 3      @SplitString  text , -- If you want to pass in the NText type, the following needs to be modified accordingly, and the comment behavior is the same as under NText 
4      @Separator  varchar ( 2 ) =  ' , ' -- NVarChar(2) = N',' 
5  )
 6  RETURNS  @SplitStringsTable  TABLE 
7  (
 8      [ id ]  int  identity ( 1 , 1 ),
 9     [ value ]  varchar ( 8000 ) -- NVarChar(4000) 
10  )
 11  AS 
12  BEGIN 
13      -- ------ @CurrentIndex records the value of the current Index, and @NextIndex records the value of the next Index in the string -- ----- 
14      DECLARE  @CurrentIndex  int ;
 15      DECLARE  @NextIndex  int ;
 16      -- ----------@ReturnText: record the string between the character at CurrentIndex and NextIndex ----- ------------ 
17      DECLARE  @ReturnText  varchar ( 8000 ); -- NVarChar(4000) 
18      SELECT @CurrentIndex=1;----为@CurrentIndex赋初值
19     WHILE(@CurrentIndex<=DATALENGTH(@SplitString)) -- DATALENGTH(@SplitString)/2
20     BEGIN
21         SELECT @NextIndex=CHARINDEX(@Separator,@SplitString,@CurrentIndex);
22         IF(@NextIndex=0 OR @NextIndex IS NULL)
23             SELECT @NextIndex=DATALENGTH(@SplitString)+1;--DATALENGTH(@SplitString)/2
24         SELECT @ReturnText=SUBSTRING(@SplitString,@CurrentIndex,@NextIndex-@CurrentIndex);
25         INSERT INTO @SplitStringsTable([value])
26         VALUES(@ReturnText);
27         SELECT @CurrentIndex=@NextIndex+1;
28     END
29     RETURN;
30 END

EX:

SELECT FN.value
FROM fn_split('A/B/C/D/E', '/') FN