How to convert varchar to numbers in sql developer - sql

Question

I trying to use list of numbers like this.
SELECT *
FROM users
WHERE id in (list_of_ids)
this is part of sql procedure and the variable 'list_of_ids' is varchar and it contains id's like this: 1,2,3,4,5........
How can i use this list and this query

Answer 1

Try this as well. This could be the better solution as it wont require any additional function to create.
oracle regexp_substr will split comma seperated values into different rows and passes to query.
SELECT *
FROM users
WHERE id in
(SELECT regexp_substr(list_of_ids,'[^,]+', 1, level) FROM dual
connect by regexp_substr(list_of_ids, '[^,]+', 1, level) is not NULL)

Answer 2

You can use a ref cursor to construct the sql query, as in this pl/sql block:
declare
list_of_ids varchar2(100) := '1,3,4'; -- example
c_cursor sys_refcursor;
result number;
begin
open c_cursor for ( 'SELECT id '||
'FROM users '||
'WHERE id in ('||list_of_ids||')'
);
fetch c_cursor into result;
while c_cursor%found
loop
dbms_output.put_line('ID='||to_char(result));
fetch c_cursor into result;
end loop;
close c_cursor;
end;
/

Answer 3

Try this solution in your project.
Add a new user function that returns a table.
Code is below:
CREATE FUNCTION [dbo].[fn_Split](#text varchar(8000), #delimiter
varchar(20) = ' ')
RETURNS #Strings TABLE
(
position int IDENTITY PRIMARY KEY,
value varchar(8000)
)
AS
BEGIN
DECLARE #index int
SET #index = -1
WHILE (LEN(#text) > 0)
BEGIN
SET #index = CHARINDEX(#delimiter , #text)
IF (#index = 0) AND (LEN(#text) > 0)
BEGIN
INSERT INTO #Strings VALUES (#text)
BREAK
END
IF (#index > 1)
BEGIN
INSERT INTO #Strings VALUES (LEFT(#text, #index - 1))
SET #text = RIGHT(#text, (LEN(#text) - #index))
END
ELSE
SET #text = RIGHT(#text, (LEN(#text) - #index))
END
RETURN
END
And then call it from your stored procedure like below.
DECLARE #list_of_ids AS VARCHAR(100)
SET #list_of_ids = '1,2,3,4,5,6,7,8,9,10,'
SELECT *
FROM users
WHERE id in (SELECT value FROM dbo.fn_Split(#list_of_ids,','))