Best way of recreating type

Question

Hi,
I have an object table. The table contains data. I need to alter an object type the table is based on. I could'nt simple recreate the object with CREATE OR REPLACE because the table is dependent on it. What do you suggest?
I need the data in the table to be safety, of course.
Thanks in advance...
JackK

Answer 1

JackK wrote:
I have an object table. The table contains data. I need to alter an object type the table is based on. I could'nt simple recreate the object with CREATE OR REPLACE because the table is dependent on it. What do you suggest?
I need the data in the table to be safety, of course.The simple answer is to alter the type and cascade the change to dependent objects. But it is not always that straight forward when dealing with complex class hierarchies.
The basic approach is demonstrated below:
SQL> create or replace type TFoo as object(
  2          id      number,
  3          name    varchar2(30)
  4  );
  5  /
Type created.
SQL>
SQL> create table testtab of TFoo(
  2          id primary key,
  3          name not null
  4  ) organization index;
Table created.
SQL>
SQL> insert into testtab select rownum, object_name from user_objects;
139 rows created.
SQL> commit;
Commit complete.
SQL>
SQL> select * from testtab where rownum < 6;
        ID NAME
         1 PK_PARTC_CUST_ID
         2 IDX1_CHILD_CUST_CODE
         3 IDX1_INC_EX
         4 INDX_CHILD_CUST_ID_001
         5 INDX_INC_ID_001
SQL> --// changing the type and cascading the change to the table
SQL> alter type TFoo add attribute(
  2          create_date     date
  3  ) cascade;
Type altered.
SQL>
SQL> select * from testtab where rownum < 6;
        ID NAME                           CREATE_DATE
         1 PK_PARTC_CUST_ID
         2 IDX1_CHILD_CUST_CODE
         3 IDX1_INC_EX
         4 INDX_CHILD_CUST_ID_001
         5 INDX_INC_ID_001