Need skeleton for this

Question

Using Dynamic
Creating a procedure emp_data with three parameters p_colname varchar2, p_value varchar2, p_ref ref_cursor
Based on the value in p_colname and p_value query the emp table and return the result set in a Cursor.
Validate the value of p_colname , it must be a valid column_name in table emp
can u give the skeleton for this ... i am nt getting how to do this for REF Cursor as parameter

Answer 1

need skeleton for thisalmost the whole body ;) :
SQL> create or replace procedure emp_data (p_colname varchar2, p_value varchar2,
p_ref out sys_refcursor)
as
   p_cnt integer := 0;
begin
   select count ( * )
     into p_cnt
     from cols
    where table_name = 'EMP' and column_name = upper (p_colname);
   if p_cnt = 1
   then
      open p_ref for
         'select ' || p_colname || ' from emp where ' || p_colname || ' = :1'
         using p_value;
   else
      raise_application_error (-20003,
      'Column ' || p_colname || ' does not exist');
   end if;
end emp_data;
Procedure created.
SQL> var c refcursor
SQL> exec emp_data('eame', 'SCOTT',:c)
BEGIN emp_data('eame', 'SCOTT',:c); END;
Error at line 27
ORA-20003: Column eame does not exist
ORA-06512: at "MICHAEL.EMP_DATA", line 17
ORA-06512: at line 1
SQL> exec emp_data('ename', 'SCOTT',:c)
PL/SQL procedure successfully completed.
SQL> print
ENAME    
SCOTT    
1 row selected.