Re: OO future

Karel Zak kirjutas K, 30.10.2002 kell 10:08:
> 
>  Hi, 
> 
>  I read a presentation about Object-Oriented features in relation DBs.
>  The nice are UDT (user defined type):
> 
>  CREATE TABLE person (
>     name varchar(32),
>     address ROW( street varchar(32),
>                  town   varchar(32)),
>     age int
>  );
> 
>  INSERT INTO person VALUES ('Bill', ('Somestreet', 'Sometown'), 33);
> 
>  SELECT name, address.town FROM person;
> 
> 
>  We have composite types in PostgreSQL and I think we can use it for this:
> 
>  CREATE TYPE addr AS (street varchar(32), town varchar(32));
>  CREATE TABLE person (
>     name varchar(32),
>     address addr,
>     age int
>  );
>  
> 
>  Comments? I nothinig found about OO in the current TODO.

I'm writing a small proposal for evoving inheritance and other OO
features in 7.4 and beyond. Will post once 7.3 is out.

> BTW, my
>  examples are only small part of possible OO features, the others
>  ideas are for example define PRIVATE/PUBLIC attributes in composite
>  types

At least the "Third Manifesto" by Date et.al. claims that PRIVATE/PUBLIC
is better left to standard access control mechanisms (GRANT/REVOKE). 

I agree to that.

> and methods, "SELECT p.name FROM person p WHERE p.pay->tax() > 100;"

The methods will probably have problems with syntax clashes with
existing stuff.

--------------
Hannu