Multiple-value in one parameter - sql-server

Question

CREATE FUNCTION [dbo].[func_1]
(
#ListNum AS nvarchar(MAX)
)
RETURNS #t TABLE
(
col_1 nvarchar(MAX)
)
AS
BEGIN
INSERT #t
SELECT col_1
FROM table_name
WHERE col_2 IN (#ListNum)
RETURN
END
When I pass only one value in paramater (for example : 1) the function correctly works but how can I pass multiple value (for example : 1,2,3,4,5). I get the following error :
Procedure execution failed
42000 - [SQL Server]Error converting data type nvarchar to bigint.
Is there a simple way to solve this?

Answer 1

Hi you can try like this,
CREATE FUNCTION Splitstring (#Input NVARCHAR(MAX),
#Character CHAR(1))
RETURNS #Output TABLE (
Item NVARCHAR(1000))
AS
BEGIN
DECLARE #StartIndex INT,
#EndIndex INT
SET #StartIndex = 1
IF Substring(#Input, Len(#Input) - 1, Len(#Input)) <> #Character
BEGIN
SET #Input = #Input + #Character
END
WHILE Charindex(#Character, #Input) > 0
BEGIN
SET #EndIndex = Charindex(#Character, #Input)
INSERT INTO #Output
(Item)
SELECT Substring(#Input, #StartIndex, #EndIndex - 1)
SET #Input = Substring(#Input, #EndIndex + 1, Len(#Input))
END
RETURN
END
GO
CREATE FUNCTION [dbo].[Func_1] (#ListNum AS NVARCHAR(MAX))
RETURNS #t TABLE (
col_1 NVARCHAR(MAX))
AS
BEGIN
INSERT #t
SELECT p.col1
FROM dbo.Splitstring(#ListNum, ',') s
JOIN Table_Name t
ON t.col2 = s.Item
RETURN
END
DECLARE #var VARCHAR(100)='1,2,3,4'
SELECT *
FROM dbo.Func_1(#var)
Introduce one more function called split string. It will return the comma separated list as a table. Join the comma separated table with your actual table. This will gives the result.

Answer 2

For versions 2008+ using table separated values can assist where the calling procedure can construct the table and you are able to create a table type. If you must pass comma (or other character separated values) in a single string then you will need to separate the comma delimited string into a result set of its own.
The XML method works well when your string doesn't contain any special XML characters such as angle brackets <> - how-to-split-a-comma-separated-value-to-columns
I think this will work for your adjusted function;
CREATE FUNCTION [dbo].[func_1]
(
#ListNum AS nvarchar(MAX)
)
RETURNS #t TABLE
(
col_1 nvarchar(MAX)
)
AS
BEGIN
DECLARE #S varchar(max),
#Split char(1),
#X xml
SELECT #S = #ListNum,
#Split = ','
SELECT #X = CONVERT(xml,' <root> <s>' + REPLACE(#S,#Split,'</s> <s>') + '</s> </root> ')
INSERT #t
SELECT col_1
FROM table_name
WHERE col_2 IN (SELECT [Value] = T.c.value('.','varchar(20)')
FROM #X.nodes('/root/s') T(c))
RETURN
END