Call me a conservative....but why bother with all these
proprietary networking stuff? Bound data
type controls are renowned for making unscalable applications - the
little bit of time saved in throwing apps together is usually absorbed in the
maintenance and slow performance that these complicated technologies
result in - especially when they don't work.
DCOM and CORBA etc. don't achieve what they are supposed to - which is
transparent operation of applications over networks. I haven't used MIDAS to
be
honest but I bet it's not the magic panacea that the spec sheet describes.
The best approach is also the simplest. Implement your own simple
client-server library
based on on straight TCP/IP or maybe RPC, stream over some type of hash table
object with a
version numbering scheme, and get your server to decipher the calls and talk to
the
database.
The advantages are that it's transparent - you know exactly when and what data
is being
sent across the network. It's easy to debug, you have complete control so it's
easy to optimise
- you don't have to spend heaps of time evaluating crap third party products
which don't work.
And lastly no license fees or danger of your client-server architecture
becoming obsolete if
the product you used gets dumped or the company which makes it goes under.
Yanbo Li wrote:
> Thanks Nic, dbOverNet licence sounds much cheaper than Midia.
> I will contact with them.
> I've already developed a Midas prototype. But the licence is too
> expensive, we have to get rid of it.
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]] On Behalf Of Nic Wise
> Sent: Wednesday, April 21, 1999 9:23 AM
> To: Multiple recipients of list delphi
> Subject: Re: [DUG]: How thin the client will be?
>
> have you thought about using dbOverNet?
> www.dbovernet.com - same idea as MIDAS (which, IMO, is your best option,
> tho it IS expensive), but I'm guessing their cost structure is a little
> different :)
> N
> Yanbo Li wrote:
> >
> > Thanks, Your information is very helpful.
> >
> > Cheers
> > Yanbo
> >
> > -----Original Message-----
> > From:
> [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]] On Behalf
> Of
> > [EMAIL PROTECTED]
> > Sent: Tuesday, April 20, 1999
> 2:14 PM
> > To: Multiple recipients of
> list delphi
> > Subject: RE: [DUG]: How
> thin the client will be?
> >
> > IB Objects and FIB components
> rep[lace the BDE for
> > Interbase but you still
> > need the IB Client.
> >
> > DCOM is not necessarily
> Windows only... but if you can
> > find anyone who nows
> > how to get DCOM for Mac or
> DCOM or Solaris working then
> > you are doing well.
> > It's hard enough to get it
> going on NT!
> >
> > You could use JBuilder and
> Corba for the server end
> > too...
> >
> > Peter Harrison IT
> <[EMAIL PROTECTED]> on 20/04/99
> > 14:45:54
> >
> > Please respond to
> [EMAIL PROTECTED]
> >
> > To: Multiple recipients of
> list delphi
> > <[EMAIL PROTECTED]>
> > cc: (bcc: Peter
> Jones/Logistics&Information
> >
> Technology/Christchurch/Foodstuffs)
> > Subject: RE: [DUG]: How
> thin the client will be?
> >
> > Using standard Delphi the
> TQuery requires the BDE to be
> > installed, along
> > with the database client of
> choice. You don't mention
> > the database
> > type, so lets assume we are
> talking Interbase. You will
> > need to install
> > the Interbase Client on the
> client machines, the BDE,
> > and your
> > application.
> >
> > This is not 'thin' client in
> the least.
> >
> > If you want to use Interbase
> you havn't got much choice
> > about any of
> > this, except that you might go
> with a product which
> > replaces the BDE
> > with a driver specifically for
> Interbase eliminating the
> > need for the
> > BDE (do these exist?)
> >
> > If you want to go with File
> Based Databases, such as
> > dBASE, you can
> > probably eliminate the
> database client and bde, and have
> > a single app,
> > and perhaps a DLL or two.
> 'Apollo' is an example
> > product for this
> > approach.
> >
> > Besides the n tier stuff there
> isn't much alternative.
> > You could always
> > start writing DCOM interfaces
> - conceivable by really
> > ugly - and Windows
> > dependant.
> >
> > Good luck...
> >
> > -----Original Message-----
> > From: Yanbo Li
> [mailto:[EMAIL PROTECTED]]
> > Sent: Tuesday, April 20, 1999
> 1:10 PM
> > To: Multiple recipients of
> list delphi
> > Subject: [DUG]: How thin
> the client will be?
> >
> > Many thanks in advance.
> > I need to know how thin the
> application will be if I
> > only use TQuery
> > and TDatabase to connect to
> remote server. If the app is
> > still very fat,
> > I have to manage to write my
> own driver which I am not
> > found of. Please
> > do not suggest me to use
> TClientDataSet and 3tier
> > technology.
> >
> >
> ------------------------------------------------------------------------
> > ---
> > New Zealand Delphi Users
> group - Delphi List -
> > [EMAIL PROTECTED]
> > Website:
> http://www.delphi.org.nz
> >
> >
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> > Website:
> http://www.delphi.org.nz
> >
> >
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> List - [EMAIL PROTECTED]
> > Website:
> http://www.delphi.org.nz
>
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