RefCursor pl/sql

Question

CREATE OR REPLACE Function FnLoc(p_unit VARCHAR2,
               p_locationa     VARCHAR2,
               p_locationb     VARCHAR2)
RETURN SYS_REFCURSOR
IS
LocResultSet SYS_REFCURSOR;
BEGIN
Open LOcResultSet is
select col1,col2,col3,col4,col5
from table_nm
where unit=punit
order by col1,col2; ---query1
Return LOcResultSet;
END;
Now I have to also add following conditions for p_locationa and plocationb in query1(refcursor)
IF p_locationa is null and p_locationz is null then
          execute query1
     if p_locationa is not null and p_locationb is null then
          locationa=plocationa or locationb=plocationa
     if p_locationa is null and p_locationb is not null then
          locationa=plocationb or locationb=plocationb
     if p_locationa is not null and p_locationb is not null then
          locationa=plocationa and locationb=plocationb.
Please suggest.
Thanks.

Answer 1

before opening the ref cursor ,u can check the following conditions i.e.
IF p_locationa is null and p_locationz is null
THEN
Open LOcResultSet is
select col1,col2,col3,col4,col5
from table_nm
where unit=punit
order by col1,col2; ---query1
ELSIF p_locationa is not null and p_locationb is null
THEN
locationa := plocationa ;
locationb := plocationa;
ELSIF p_locationa is null and p_locationb is not null
THEN
locationa := plocationb ;
locationb := plocationb;
ELSIF p_locationa is not null and p_locationb is not null
THEN
locationa := plocationa;
locationb := plocationb;
ELSE
NULL;
END IF;
I think so above code satisfy your answer, otherwise just more clarify your query.