Converting String List into Int List in SQL - sql

Question

I have a nvarchar(MAX) in my stored procedure which contains the list of int values, I did it like this as it is not possible to pass int list to my stored procedure,
but, now I am getting problem as my datatype is int and I want to compare the list of string.
Is there a way around by which I can do the same?
---myquerry----where status in (#statuslist)
but the statuslist contains now string values not int, so how to convert them into INT?
UPDate:
USE [Database]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[SP]
(
#FromDate datetime = 0,
#ToDate datetime = 0,
#ID int=0,
#List nvarchar(MAX) //This is the List which has string ids//
)
AS
SET FMTONLY OFF;
DECLARE #sql nvarchar(MAX),
#paramlist nvarchar(MAX)
SET #sql = 'SELECT ------ and Code in(#xList)
and -------------'
SELECT #paramlist = '#xFromDate datetime,#xToDate datetime,#xId int,#xList nvarchar(MAX)'
EXEC sp_executesql #sql, #paramlist,
#xFromDate = #FromDate ,#xToDate=#ToDate,#xId=#ID,#xList=#List
PRINT #sql
So when I implement that function that splits then I am not able to specify the charcter or delimiter as it is not accepting it as (#List,',').
or (','+#List+',').

Answer 1

It is possible to send an int list to your stored procedure using XML parameters. This way you don't have to tackle this problem anymore and it is a better and more clean solution.
have a look at this question:
Passing an array of parameters to a stored procedure
or check this code project:
http://www.codeproject.com/Articles/20847/Passing-Arrays-in-SQL-Parameters-using-XML-Data-Ty
However if you insist on doing it your way you could use this function:
CREATE FUNCTION [dbo].[fnStringList2Table]
(
#List varchar(MAX)
)
RETURNS
#ParsedList table
(
item int
)
AS
BEGIN
DECLARE #item varchar(800), #Pos int
SET #List = LTRIM(RTRIM(#List))+ ','
SET #Pos = CHARINDEX(',', #List, 1)
WHILE #Pos > 0
BEGIN
SET #item = LTRIM(RTRIM(LEFT(#List, #Pos - 1)))
IF #item <> ''
BEGIN
INSERT INTO #ParsedList (item)
VALUES (CAST(#item AS int))
END
SET #List = RIGHT(#List, LEN(#List) - #Pos)
SET #Pos = CHARINDEX(',', #List, 1)
END
RETURN
END
Call it like this:
SELECT *
FROM Table
WHERE status IN (SELECT * from fnStringList2Table(#statuslist))

Answer 2

You can work with string list too. I always do.
declare #statuslist nvarchar(max)
set #statuslist = '1, 2, 3, 4'
declare #sql nvarchar(max)
set #sql = 'select * from table where Status in (' + #statuslist + ')'
Execute(#sql)

Answer 3

You can do this by using sql function which will return you an integer array..
It would be great if you pass #Delimiter separated string to your stored procedure which could be processed properly afterwards.
Write one function to split the data as following
CREATE FUNCTION [dbo].[SplitValues] (#StringArray NVARCHAR(MAX), #Delimiter NVARCHAR(10))
RETURNS #ResultedValues table
(
ResultValue INT
)
AS
BEGIN
DECLARE #Tokens TABLE(Token nvarchar)
DECLARE #String nvarchar
WHILE (CHARINDEX(#Delimiter,#StringArray)>0)
BEGIN
INSERT INTO #Tokens (Token) VALUES (LTRIM(RTRIM(SUBSTRING(#StringArray,1,CHARINDEX(#Delimiter,#StringArray)-1))))
SET #String = SUBSTRING(#StringArray,
CHARINDEX(#Delimiter,#StringArray)+LEN(#Delimiter),LEN(#StringArray))
END
INSERT INTO #ResultedValues (ResultValue ) VALUES ( CAST(LTRIM(RTRIM(#String)) AS INT))
RETURN
END
And then use it like following, i am using (,) as #Delimiter here
SELECT ResultValue [YourSchema].[SplitValues](#statuslist,',')

Answer 4

Actually, you can send the list of int values to your procedure by creating a User Defined Table Type. However, this implies more work in order to populate the table parameter.
In your case, you can use the sp_executesql stored procedure to achieve what you want like this:
declare #statement nvarchar(4000) = '----your query---- where status in ('
+ #statusList +')'
sp_executesql #statement

Answer 5

here is an example of how to do it and the Link for more informations
ALTER FUNCTION iter_intlist_to_tbl (#list nvarchar(MAX))
RETURNS #tbl TABLE (listpos int IDENTITY(1, 1) NOT NULL,
number int NOT NULL) AS
BEGIN
DECLARE #startpos int,
#endpos int,
#textpos int,
#chunklen smallint,
#str nvarchar(4000),
#tmpstr nvarchar(4000),
#leftover nvarchar(4000)
SET #textpos = 1
SET #leftover = ''
WHILE #textpos <= datalength(#list) / 2
BEGIN
SET #chunklen = 4000 - datalength(#leftover) / 2
SET #tmpstr = ltrim(#leftover + substring(#list, #textpos, #chunklen))
SET #textpos = #textpos + #chunklen
SET #startpos = 0
SET #endpos = charindex(' ' COLLATE Slovenian_BIN2, #tmpstr)
WHILE #endpos > 0
BEGIN
SET #str = substring(#tmpstr, #startpos + 1, #endpos - #startpos - 1)
IF #str <> ''
INSERT #tbl (number) VALUES(convert(int, #str))
SET #startpos = #endpos
SET #endpos = charindex(' ' COLLATE Slovenian_BIN2, #tmpstr, #startpos + 1)
END
SET #leftover = right(#tmpstr, datalength(#tmpstr) / 2 - #startpos)
END
IF ltrim(rtrim(#leftover)) <> ''
INSERT #tbl (number) VALUES(convert(int, #leftover))
RETURN
END
-- ############################ Example ############################
--CREATE PROCEDURE get_product_names_iter #ids varchar(50) AS
--SELECT P.ProductName, P.ProductID
--FROM Northwind..Products P
--JOIN iter_intlist_to_tbl(#ids) i ON P.ProductID = i.number
--go
--EXEC get_product_names_iter '9 12 27 37'
-- ############################ WICHTIG ############################

Answer 6

This works for me on an Informix DataBase:
DROP FUNCTION rrhh:fnc_StringList_To_Table;
CREATE FUNCTION rrhh:fnc_StringList_To_Table (pStringList varchar(250))
RETURNING INT as NUMERO;
/* A esta Funcion le podes pasar una cadena CSV con una lista de numeros
* Ejem: EXECUTE FUNCTION fnc_StringList_To_Table('1,2,3,4');
* y te devolvera una Tabla con dichos numeros separados uno x fila
* Autor: Jhollman Chacon #Cutcsa - 2019 */
DEFINE _STRING VARCHAR(255);
DEFINE _LEN INT;
DEFINE _POS INT;
DEFINE _START INT;
DEFINE _CHAR VARCHAR(1);
DEFINE _VAL INT;
LET _STRING = REPLACE(pStringList, ' ', '');
LET _START = 0;
LET _POS = 0;
LET _LEN = LENGTH(_STRING);
FOR _POS = _START TO _LEN
LET _CHAR = SUBSTRING(pStringList FROM _POS FOR 1);
IF _CHAR <> ',' THEN
LET _VAL = _CHAR::INT;
ELSE
LET _VAL = NULL;
END IF;
IF _VAL IS NOT NULL THEN
RETURN _VAL WITH RESUME;
END IF;
END FOR;
END FUNCTION;
EXECUTE FUNCTION fnc_StringList_To_Table('1,2,3,4');
SELECT * FROM TABLE (fnc_StringList_To_Table('1,2,3,4'));