Comments on: Object-Oriented Oracle with Substitutable Types

By: Bill

Bill — Thu, 29 Jul 2010 13:25:33 +0000

Hope nobody minds me posting up to an old thread.

Why doesn’t 10g allow types to reference a table column type for it’s children?

I.e.:
create or replace type car as object (
model dbo_space.car_table.modle%type) not final;

Or does it and I’m just going about it all wrong?
Thanks,
Bill

By: K Roy

K Roy — Wed, 08 Jul 2009 18:32:52 +0000

Thanks for the interesting article Steve!

By: Bryan Mack

Bryan Mack — Tue, 26 Feb 2008 03:24:51 +0000

Thanks for this info! Was very helpful to me in my first creation of a column object!

By: Sridhar Pandari

Sridhar Pandari — Wed, 03 Oct 2007 19:33:02 +0000

Excellent article with good examples.
I wanted to share one issue we ran into while implementing substitutable object types.
When we declare a column in a table as an object type, Oracle stores all the attributes of the type and all its sub-types as hidden columns in the table. If we have lots of sub-types, we could run into an oracle error “maximum number of columns exceeded” since there is a 1000 column limit for an Oracle table.
We ran into this situation recently where we needed to add more sub-types and it will not let us do that. I am currently trying to figure out a work-around for this problem

Sridhar

By: RMorgan

RMorgan — Thu, 27 Sep 2007 13:58:44 +0000

Great example! Thank you for clarifying several questions I had about substitutable types. Keep up the great site and work!

RMorgan

By: sandeep

sandeep — Tue, 26 Dec 2006 06:37:07 +0000

great example

By: LewisC

LewisC — Sun, 19 Nov 2006 23:11:09 +0000

Steve,

Great example and demo. I use OO in my PL/SQL quite frequently but in my SQL less so. This example is something to keep in mind.

Thanks,

LewisC