How to determine types of subprograms in Oracle Package

Question

This is best explained with an example. Given the below database objects:

CREATE OR REPLACE PROCEDURE TEST_PROCEDURE IS
BEGIN
  NULL;
END;
/

CREATE OR REPLACE F         


        

Answer 1

Similar idea to @collapsar, but using the argument position to differentiate between a procedure and a function. A function has an (unnamed) argument in position zero, in addition to any formal parameters which start at position one. Procedures don't have the position zero argument.

select up.object_name, up.procedure_name,
  case ua.position when 0 then 'FUNCTION' else 'PROCEDURE' end as type
from user_procedures up
left join user_arguments ua
on ua.object_id = up.object_id
and ua.subprogram_id = up.subprogram_id
and position = 0
where up.object_type = 'PACKAGE'
and up.object_name = 'TEST_PACKAGE'
and up.procedure_name is not null;

OBJECT_NAME                    PROCEDURE_NAME                 TYPE    
------------------------------ ------------------------------ ---------
TEST_PACKAGE                   TEST_FUNCTION                  FUNCTION 
TEST_PACKAGE                   TEST_PROCEDURE                 PROCEDURE

Answer 2

You may identify package functions and procedures by using the all_procedures view, examining the data on the method's arguments as it is stored in the data dictionary for a return value:

    SELECT p.object_name
         , p.procedure_name
         , CASE WHEN a.object_id IS NULL THEN 'PROCEDURE' ELSE 'FUNCTION' END ptype
      FROM all_procedures p
 LEFT JOIN all_arguments  a ON (
                                     a.object_id     = p.object_id
                                 AND a.subprogram_id = p.subprogram_id
                                 AND a.data_level    = 0
                                 AND a.argument_name IS NULL
                               )
     WHERE p.object_name IS NOT NULL
         ;