Using parameters in procedures - plsql

Question

I need to create a procedure that receives as a parameter a month and a year.
Inside the procedure I need to have a query to retrieve some values, that will have to take in account the parameters received.
create or replace procedure GET_REVS(MONTH in VARCHAR2,YEAR in varchar2) is
SELECT
*
FROM
REVENUS_TABLE
WHERE
Y_CODE IN ('YEAR')
AND M_CODE IN ()
Now, M_CODE should have the values since the start of the year until the month received by parameter.
Example if i receive in as parameter for the month a 4 i want my select to like this AND M_CODE IN ('1','2','3','4')
But if i receive MONTH = 3.. i need the select to have AND M_CODE IN ('1','2','3')
So what is the best way to do the procedure in order to be able to do that?
Thanks a lot

Answer 1

You could cast both M_CODE and MONTH as numbers and use BETWEEN operator or just <=:
CREATE OR REPLACE PROCEDURE get_revs(month IN VARCHAR2, year IN VARCHAR2) IS
BEGIN
....
SELECT *
FROM revenus_table
WHERE y_code = year
AND TO_NUMBER(m_code) BETWEEN 1 AND TO_NUMBER(month);
...
END;

Answer 2

You can do some thing like below example to make your procedure more dynamic
CREATE OR REPLACE PROCEDURE get_revs (
MONTH IN VARCHAR2,
YEAR IN VARCHAR2
)
IS
variable_name table_name%ROWTYPE;
v_sql VARCHAR2 (1000)
:= 'SELECT * FROM REVENUS_TABLE WHERE Y_CODE IN ('
|| MONTH
|| ')';
BEGIN
IF MONTH = 4 THEN
v_sql := v_sql || ' and M_CODE IN (''1'',''2'',''3'',''4'')';
END IF;
IF MONTH = 3 THEN
v_sql := v_sql || 'and M_CODE IN (''1'',''2'',''3'')';
END IF;
EXECUTE IMMEDIATE v_sql
INTO variable_name;
END;

Answer 3

Just an alternative to think about.
CREATE OR REPLACE PROCEDURE get_revs(month IN VARCHAR2, year IN VARCHAR2) IS
lv_in_clause VARCHAR2(100 CHAR);
p_ref sys_refcursor;
BEGIN
SELECT 'IN ('
||WMSYS.WM_CONCAT(A.NUM)
||')'
INTO lv_in_clause
FROM
(SELECT ''''
||LEVEL
||'''' NUM,
1 ID1
FROM DUAL
CONNECT BY LEVEL < to_number(MONTH)
)A
GROUP BY a.ID1;
OPEN p_ref FOR 'SELECT *
FROM revenus_table
WHERE y_code = '|| year
||' AND m_code '||lv_in_clause;
END;