Oracle limitation? function created using "or replace" clause

Question

How I can know if function is created using "or replace" clause?
I mean we can use "create function xxx" or "create or replace function xxx" to create function.
when we check all_source (select text from all_source) to get the function body. The "or replace" clause is missing. Both are like "Function xxx".
We are asked to be able to identify if the function create using "create" or "create or replace".
what we should do? Is this Oracle limitation?

Answer 1

That only works if nothing other than create create/replace happens tot he function over time. consider:
SQL> CREATE TABLE t AS
  2  SELECT rownum id, TO_CHAR(TO_DATE(rownum, 'J'), 'Jsp') descr
  3  FROM all_objects
  4  WHERE rownum < 10;
Table created.
SQL> CREATE FUNCTION f (p_num IN NUMBER) RETURN VARCHAR2 AS
  2     l_v VARCHAR2(30);
  3  BEGIN
  4     SELECT descr INTO l_v
  5     FROM t
  6     WHERE id = p_num;
  7     RETURN l_v;
  8  END;
  9  /
Function created.
SQL> SELECT object_name, created, last_ddl_time, timestamp
  2  FROM user_objects
  3  WHERE object_name = 'F';
OBJECT_NAM CREATED              LAST_DDL_TIME        TIMESTAMP
F          09-aug-2010 09:45:39 09-aug-2010 09:45:39 2010-08-09:09:45:39As a brand new function, all dates agree, as expected. But now, I want someone to actually be abl to use this function so:
SQL> GRANT EXECUTE ON f TO john;
Grant succeeded.
SQL> SELECT object_name, created, last_ddl_time, timestamp
  2  FROM user_objects
  3  WHERE object_name = 'F';
OBJECT_NAM CREATED              LAST_DDL_TIME        TIMESTAMP
F          09-aug-2010 09:45:39 09-aug-2010 09:47:00 2010-08-09:09:45:39Note that grant is ddl and it was performed on this function, so last_ddl is different, but I have not done a create or replace. The timestamp is still the same, so maybe that is a possibility? But ...
SQL> ALTER TABLE t ADD (descr2 VARCHAR2(30));
Table altered.
SQL> SELECT status
  2  FROM user_objects
  3  WHERE object_name = 'F';
STATUS
INVALID
SQL> SELECT f(1) FROM dual; -- auto recompile
F(1)
One
SQL> SELECT object_name, created, last_ddl_time, timestamp
  2  FROM user_objects
  3  WHERE object_name = 'F';
OBJECT_NAM CREATED              LAST_DDL_TIME        TIMESTAMP
F          09-aug-2010 09:45:39 09-aug-2010 09:49:03 2010-08-09:09:49:03So, I have still not explicitly done a create or replace, but timestamp is now different. Does this auto recompile count as create or replace?
John