Converting String List into Int List in 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'));