Re: Object Inherit and Retrieve

hi,

Oracle 8 does not support object inheritance. From oracle documentation, Oracle8i Application Developer's Guide - Fundamental V 8.1.5: "The Oracle type model does not support inheritance directly. However, you can map your current Oracle object types to Java classes and then leverage the inheritance features native to Java. See Also: Oracle8i JDBC Developer's Guide and Reference and Oracle8i SQLJ Developer's Guide and Reference for more information about mapping Oracle objects to Java classes."

yong321_at_yahoo.com wrote:
>
> In article <39405696.1FC8B7C1_at_ucalgary.ca>,
> cfei_at_ucalgary.ca wrote:
> > Hi, folks,
> >
> > Oracle 8 can create objects which encapsulated data and methods. I
 have two questions and hope to
> > get your help:
> >
> > 1. how to implement the object inherit?
> >
> > I have a data model which organized by object inheritance hierarchy,
 like triangle and rectangle
> > inherits from polygon. How to implement this data model in Oracle 8?
>
> I don't see anything special. If you think a triangle is also a
> polygon, think of the textbook example of manager entity vs employee
> entity; if you don't think a triangle should also be a polygon (so it's
> only a child of the polygon category), think of the textbook example of
> department vs employee. In either case, you use foreign key constraint
> to implement their relationship.
>
> --
> Yong Huang
>
> (yong321_at_yahoo.com)
> (http://www.stormloader.com/yonghuang/)
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.
Received on Thu Jun 22 2000 - 00:00:00 CDT