Inserting data into subtypes by making use of the super type

Question

Dear All,
Let's say I have the following statements defining two object types and create two tables for them:
create type t1 as object(x number) not final;
create type t2 under t1(y number);
create table t1t of t1;
create table t2t of t2;
I know I can use insert into t2t values(t2(12,12)) to get a new row.
However, let's say I have run an insert into t1t values(t1(12)) and I want to make use of that object in the insert for t2t (something like
insert into t2t values(t1value,12)). Is this possible?
Jim

Answer 1

>
That works, but do we need to repeat all the data in t1's constructor? In the trivial example it is easy because t1 has a single argument but if you are meant to be typing everythinh again, you might as well do the full insert. Is there not something that will give you the value of the object you need (something like select value(e) from t1...)?
Another idea that I am going to try is various member methods so that if you know the ID of the superclass objects you get the information; still can not beleive there is no function that will give me the values of the superclass.
>
You are using the default constructor.
Just create your own constructors. Create several of them if you want: one that takes a T1 instance. Then you can provide that T1 instance statically or from a query and the constructor will access the values without you needing to specify them.
You could also create your own constructor so that if you only provide one value the constructor calls 'super' and creates some 'default' T1.x value.