Collection in objecttype and in objectview

Question

Hi,
I have a type a_type:
create type a_type as object ( code varchar2(20));
And a collection of that type:
create type a_list as table of a_type;
and there are two tables:
create table A (id number, code a_type);
create table B (id number, a_id number, code a_type);
Then I create a objecttype b_type:
create type b_type as object (a_id number,
a_code a_type,
b_codes a_list);
And finally an objectview:
create view b_view OF b_type with object OID (a_id)
AS
SELECT a.id as a_id,
a.code as a_code,
b.??? as b_codes -- a list of all codes (table B joined with table A))
FROM A a, B b
WHERE a.id = b.a_id
AND ????
Is this possible wihout PL/SQL ?
Thanks,
Kristoffel DE GEEST

Answer 1

Not sure if this is exactly what you want, but it seems to work....
SQL> INSERT INTO a VALUES (1, a_type('APC'))
  2  /
1 row created.
SQL> INSERT INTO a VALUES (2, a_type('XYZ'))
  2  /
1 row created.
SQL> INSERT INTO b VALUES (1, 1, a_type('123'))
  2  /
1 row created.
SQL> INSERT INTO b VALUES (2, 1, a_type('456'))
  2  /
1 row created.
SQL> INSERT INTO b VALUES (3, 2, a_type('789'))
  2  /
1 row created.
SQL> CREATE VIEW b_view OF b_type  WITH OBJECT IDENTIFIER  (a_id)
  2  AS
  3  SELECT a.id AS a_id
  4         , a.code AS a_code
  5         , a_list(b.code) AS b_codes
  6  FROM   A a, B b
  7  WHERE a.id = b.a_id
  8  /
View created.
SQL> select * from b_view;
      A_ID
A_CODE(CODE)
B_CODES(CODE)
         1
A_TYPE('APC')
A_LIST(A_TYPE('123'))
         1
A_TYPE('APC')
A_LIST(A_TYPE('456'))
         2
A_TYPE('XYZ')
A_LIST(A_TYPE('789'))
SQL> "It's a far cry from small boys in the park, jumpers for goalposts. Isn't it? Mmmmm. Marvellous!" -- Ron Manager
Cheers, APC