PLS-00455: cursor 'CUR_1' cannot be used in dynamic SQL OPEN statement

Question

create or replace function f_my_test_func
return refcur_pkg.refcur_t1
is
cur_1  refcur_pkg.refcur_t1;
begin
open cur_1
for
'select * from dept';
return cur_1;
exception
when others
then
insert into ddl_log (SQLTEXT)
values
('fucntion error'); 
end;

Answer 1

I would suggest that cur_1 refcur_pkg.refcur_t1 is a stongly typed ref cursor i.e. it has RETURN dept%ROWTYPE or something similar in the declaration. You can't use strongly typed ref cursors with dynamic SQL in this way. The declaration should be weakly typed or just use sys_refcursor.
DTYLER_APP@pssdev2> DECLARE
  2
  3      TYPE t_Strong   IS REF CURSOR RETURN dual%ROWTYPE;
  4
  5      lc_Strong       t_Strong;
  6
  7  BEGIN
  8
  9      OPEN lc_Strong FOR
10      'SELECT * FROM dual';
11
12  END;
13  /
    OPEN lc_Strong FOR
ERROR at line 9:
ORA-06550: line 9, column 10:
PLS-00455: cursor 'LC_STRONG' cannot be used in dynamic SQL OPEN statement
ORA-06550: line 9, column 5:
PL/SQL: Statement ignored
DTYLER_APP@pssdev2>
DTYLER_APP@pssdev2> DECLARE
  2
  3      TYPE t_Weak   IS REF CURSOR;
  4
  5      lc_Weak       t_Weak;
  6
  7  BEGIN
  8
  9      OPEN lc_Weak FOR
10      'SELECT * FROM dual';
11
12  END;
13  /
PL/SQL procedure successfully completed.
DTYLER_APP@pssdev2> DECLARE
  2
  3      lc_Weak       sys_refcursor;
  4
  5  BEGIN
  6
  7      OPEN lc_Weak FOR
  8      'SELECT * FROM dual';
  9
10  END;
11  /
PL/SQL procedure successfully completed.
DTYLER_APP@pssdev2>HTH
David