Error will creating function

Question

Hi Team,
I am getting error message while creating Function script as below..
CREATE TYPE Book_t AS OBJECT
( name VARCHAR2(100),
  AUTHOR VARCHAR2(30),
  ABSTRACT VARCHAR2(1000));
CREATE TYPE BOOKSET_T AS TABLE OF BOOK_T;
CREATE TABLE Catalogs
( NAME VARCHAR2(30),
  CAT CLOB);
  CREATE or replace FUNCTION GetBooks(a CLOB) RETURN BookSet_t;
Error message :=
Error(1): PLS-00378: invalid compilation unit for this release of PL/SQL
But All object are valid state only.

Answer 1

You cannot forward declare functions as database objects like you do in packages, you have to actually provide the body of the function as well..
SQL> CREATE or replace FUNCTION GetBooks(a CLOB) RETURN BookSet_t;
  2  /
Warning: Function created with compilation errors.
SQL> sho err
Errors for FUNCTION GETBOOKS:
LINE/COL ERROR
0/0      PLS-00378: invalid compilation unit for this release of PL/SQL
SQL> CREATE or replace FUNCTION GetBooks(a CLOB) RETURN BookSet_t IS
  2  BEGIN
  3    NULL;
  4  END;
  5  /
Function created.