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<H1>[MUD-Dev] Re: DBMS in MU*'s</H1>
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<LI><em>To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
<LI><em>Subject</em>: [MUD-Dev] Re: DBMS in MU*'s </LI>
<LI><em>From</em>: J C Lawrence <<A HREF="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</A>></LI>
<LI><em>Date</em>: Tue, 11 Aug 1998 16:14:22 -0700</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
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<PRE>
On Sun, 19 Jul 1998 20:46:15 +0200
Asmodai <Jeroen> wrote:
> At 19:37 19-07-98 , you wrote:
Please use full attributions that identify the original poster.
Attributing to "you" is not good enough. See:
<A HREF="http://www.kanga.nu/~petidomo/lists/mud-dev/index.html#rules">http://www.kanga.nu/~petidomo/lists/mud-dev/index.html#rules</A>
and rule #5 in particular.
> A ORDBMS would be better than either a OO- or R-DBMS alone in my
> humble revised opinion as objects (or items and such) are related to
> a person or location, but can be children of one parent.
This depends on your object model. It can be true, or might not.
There are (dis-)advantages both ways. Consider the implications for
user programming for one.
>> How do I implement an object model that specifies what objects
>> provide direct objects for various verbs? There isn't a one-to-one
>> mapping between classes as defined above and direct-object-classes.
>> For example, say we have a class liquid_container; now both a
>> wineskin and a crystal goblet are liquid_containers. But one
>> provides a direct object to "break" and one does not.
>>
>> Multiple inheritance may provide a solution. That is, I create an
>> empty table (class) "fragile" and nestle it under "object". Then
>> the goblet inherits both "liquid_container" and "fragile". And if
>> someone tries to break it, we look to see if it's a member of
>> "fragile" (or "fragile*" if I have subclassed "fragile" in the
>> meantime).
>>
>> I'm worried that this will cause a huge explosion in the number of
>> tables, though. Plus an awful lot of ugly special case code in the
>> server.
> I understand yer concern, but is a 'condition' table (or something
> like that) which lists the states an object can be in not the
> solution then? I mean, create a table with entries like:
> rock, glass, velvet, wood and paper and assign values about the
> subject being able to break, torn apart etc...
I'd suggest an analogue of Java interfaces would be a much more native
approach. There's a fairly decent article in this month's C++ Report
(might have been CUJ, but I don't think so and the mags are at home)
on implementing interfaces under C++ which is worth reading.
> This would eliminate multiple tables and generally provide a good
> addition to the MU*.
I see horrors when you start to get:
volcanic_glass, silicate_glass, pyrex, lead_crytal, etc.
--
J C Lawrence Internet: claw#null,net
(Contractor) Internet: coder#ibm,net
---------(*) Internet: claw#under,engr.sgi.com
...Honourary Member of Clan McFud -- Teamer's Avenging Monolith...
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<li><strong><A NAME="00678" HREF="msg00678.html">[MUD-Dev] Re: DBMS in MU*'s</A></strong>
<ul compact><li><em>From:</em> quzah#geocities,com</li></ul>
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<LI><STRONG><A NAME="00259" HREF="msg00259.html">[MUD-Dev] Re: DBMS in MU*'s</A></STRONG>
<UL><LI><EM>From:</EM> Jeroen Ruigrok/Asmodai <asmodai#wxs,nl></LI></UL></LI>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>[MUD-Dev] Re: DBMS in MU*'s</STRONG>, <EM>(continued)</EM>
<ul compact>
<LI><strong><A NAME="00255" HREF="msg00255.html">[MUD-Dev] Re: DBMS in MU*'s</A></strong>,
Adam J. Thornton <a href="mailto:adam#phoenix,Princeton.EDU">adam#phoenix,Princeton.EDU</a>, Sun 19 Jul 1998, 15:28 GMT
<UL>
<LI><strong><A NAME="00256" HREF="msg00256.html">[MUD-Dev] Re: DBMS in MU*'s</A></strong>,
Jeroen Ruigrok/Asmodai <a href="mailto:asmodai#wxs,nl">asmodai#wxs,nl</a>, Sun 19 Jul 1998, 15:46 GMT
<UL>
<LI><strong><A NAME="00258" HREF="msg00258.html">[MUD-Dev] Re: DBMS in MU*'s</A></strong>,
Adam J. Thornton <a href="mailto:adam#phoenix,Princeton.EDU">adam#phoenix,Princeton.EDU</a>, Sun 19 Jul 1998, 17:47 GMT
<UL>
<LI><strong><A NAME="00259" HREF="msg00259.html">[MUD-Dev] Re: DBMS in MU*'s</A></strong>,
Jeroen Ruigrok/Asmodai <a href="mailto:asmodai#wxs,nl">asmodai#wxs,nl</a>, Sun 19 Jul 1998, 18:45 GMT
<UL>
<LI><strong><A NAME="00668" HREF="msg00668.html">[MUD-Dev] Re: DBMS in MU*'s</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Tue 11 Aug 1998, 23:14 GMT
<UL>
<LI><strong><A NAME="00678" HREF="msg00678.html">[MUD-Dev] Re: DBMS in MU*'s</A></strong>,
quzah <a href="mailto:quzah#geocities,com">quzah#geocities,com</a>, Wed 12 Aug 1998, 10:55 GMT
</LI>
</UL>
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<LI><strong><A NAME="00267" HREF="msg00267.html">[MUD-Dev] Re: DBMS in MU*'s</A></strong>,
Ross Nicoll <a href="mailto:rnicoll#lostics,demon.co.uk">rnicoll#lostics,demon.co.uk</a>, Mon 20 Jul 1998, 07:34 GMT
</LI>
<LI><strong><A NAME="00666" HREF="msg00666.html">[MUD-Dev] Re: DBMS in MU*'s</A></strong>,
J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Tue 11 Aug 1998, 22:26 GMT
<UL>
<LI><strong><A NAME="00675" HREF="msg00675.html">[MUD-Dev] Re: DBMS in MU*'s</A></strong>,
Jon A. Lambert <a href="mailto:jlsysinc#ix,netcom.com">jlsysinc#ix,netcom.com</a>, Wed 12 Aug 1998, 04:26 GMT
</LI>
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