[MUD-Dev] Database vs. Disk
J C Lawrence
claw at kanga.nu
Fri May 23 01:07:21 New Zealand Standard Time 2003
On Thu, 22 May 2003 16:06:37 -0400 (EDT)
Zach Collins <(Siege)" <zcollins at seidata.com>> wrote:
> On Thu, 22 May 2003, Nicolai Hansen wrote:
>> Despite my search I have never encountered a database that allowed me
>> to store an object. I always have to write Object.Save() /
>> Object.Load() methods which is a pain, especially when you want to
>> change stuff.
> I believe a number of interpreted languages offer object serialization
> - Python and Java at the very least...
cf ZODB for the Python world.
> ... - but compiled languages like C++ tend not to have options like
> that by default.
Certainly there are a great many external libraries which offer object
(de-)serialisation for C++ (usually in platform dependent ways), but
yes, its not a base language feature.
> In part, I think, this is because objects are more complex after
> compile-time than the sum of their parts as coded, so that you have to
> pick and choose what gets serialized and how.
Given: ObjectA contains a pointer to ObjectB, a reference to ObjectC,
and an attribute of ObjectD, and inherits from ObjectX and ObjectY,
each of which potentially have their own variously complex multiple
When I serialise ObjectA, how much do I have to serialise? For that
choice, how do I guarantee logical consistency across the DB for
crash-recovery or rollbacks or even simple updates to objects which are
commonly inherited from or otherwise referenced?
J C Lawrence
---------(*) Satan, oscillate my metallic sonatas.
claw at kanga.nu He lived as a devil, eh?
http://www.kanga.nu/~claw/ Evil is a name of a foeman, as I live.
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