Updating a nested table of references

Question

Hi,
Can anyone tell me the syntax for updating a nested table of references?
For example:
CREATE TYPE purchaseorder_ob AS OBJECT(
order_number NUMBER(6),
shipping_date DATE,
city VARCHAR2(30),
orderlineitem orderlineitem_va);
CREATE TYPE refpurchaseorder_tab AS TABLE of REF purchaseorder_ob;
CREATE TYPE customer_ob AS OBJECT(
customer_number NUMBER(5),
customer_name VARCHAR2(50),
city VARCHAR2(30),
reftopurchaseorder refpurchaseorder_tab)
NOT FINAL;
CREATE TABLE customer_t OF customer_ob (customer_number Primary key)
NESTED TABLE reftopurchaseorder STORE AS reftopurchaseorder_nt;
UPDATE customer_t
SET reftopurchaseorder = ???????
WHERE customer_number = 1;
What do I put for ??????
Any help would be greatly appreciated.
Fernanda.

Answer 1

Type declarations are not complete, nevertheless for example:
SQL> CREATE TYPE orderlineitem_va AS VARRAY(10) of NUMBER(10);
  2  /
Type created.
SQL> CREATE OR REPLACE TYPE purchaseorder_ob AS OBJECT(
  2  order_number NUMBER(6),
  3  shipping_date DATE,
  4  city VARCHAR2(30),
  5  orderlineitem orderlineitem_va);
  6  /
Type created.
SQL> CREATE TYPE refpurchaseorder_tab AS TABLE of REF purchaseorder_ob;
  2  /
Type created.
SQL> CREATE TYPE customer_ob AS OBJECT(
  2  customer_number NUMBER(5),
  3  customer_name VARCHAR2(50),
  4  city VARCHAR2(30),
  5  reftopurchaseorder refpurchaseorder_tab)
  6  NOT FINAL;
  7  /
Type created.
SQL> CREATE TABLE customer_t OF customer_ob (customer_number Primary key)
  2  NESTED TABLE reftopurchaseorder STORE AS reftopurchaseorder_nt;
Table created.
SQL> desc customer_t
Name                                      Null?    Type
CUSTOMER_NUMBER                           NOT NULL NUMBER(5)
CUSTOMER_NAME                                      VARCHAR2(50)
CITY                                               VARCHAR2(30)
REFTOPURCHASEORDER                                 REFPURCHASEORDER_TAB
SQL> insert into customer_t values(customer_ob(1,'James','Dublin',null));
1 row created.
SQL> commit;
Commit complete.
SQL> create table purchase_t of purchaseorder_ob;
Table created.
SQL> insert into purchase_t values(purchaseorder_ob(1,sysdate,'London',null));
1 row created.
SQL> insert into purchase_t values(purchaseorder_ob(2,sysdate,'London',null));
1 row created.
SQL> commit;
Commit complete.
SQL> select ref(p) from purchase_t p;
REF(P)
000028020918B2D893716E47CE91690542A6898D71432C6F6282764771BFD25979B8BCB3DB01000C
2D0000
0000280209EA531A4F6833495A9AF846C57A846A4D432C6F6282764771BFD25979B8BCB3DB01000C
2D0001
SQL> update customer_t
  2  set REFTOPURCHASEORDER =
  3  CAST(MULTISET(SELECT REF(p) FROM purchase_t p) AS REFPURCHASEORDER_TAB)
  4  WHERE customer_number = 1
  5  /
1 row updated.
SQL> commit;
Commit complete.
SQL> select * from customer_t;
CUSTOMER_NUMBER CUSTOMER_NAME
CITY
REFTOPURCHASEORDER
              1 James
Dublin
REFPURCHASEORDER_TAB(000022020818B2D893716E47CE91690542A6898D71432C6F6282764771B
FD25979B8BCB3DB, 0000220208EA531A4F6833495A9AF846C57A846A4D432C6F6282764771BFD25
979B8BCB3DB)Rgds.