Re: Multi Tiered ODBC

cbbrowne@wolfe.brownes.org (Christopher B. Browne) writes: > > On 07 Nov 1996 21:26:23 -0600, Michael Leo <mal@visi.com> posted: > > > >If you prefer the cutting edge, check out the 3 tier Java/RDBMS architecture > >sported by Caribou Lake Software: > > > > http://www.cariboulake.com > > This is neat and all, but is it actually 3 tier? > > Looks pretty much like a two tier system where application logic runs on the > "presentation" server and the DB runs on the "DB" server. > > Usually there's an expectation that in a 3 tier system the application logic > (or at least *some* logic) runs at a separate level. > -- > Christopher B. Browne, cbbrowne@unicomp.net, chris_browne@sdt.com > "When you say 'I wrote a program that crashed Windows', people just stare at > you blankly and say 'Hey, I got those with the system, *for free*" > - Linus Torvalds Sorry it took so long to respond. I've been pretty busy. I wasn't refering to Caribou Lake's JSQL driver when I was referring to three tier. JSQL is merely the mechanism to provide persistence for Java objects. Rather, I was referring to the Object/Relational mapping solution. This architecture is somewhat like: Client(Java) RMI Object Server(Java) JDBC RDBMS (Presentation) -------> (Business Logic -------> (JSQL running and Object to against Ingres, Relational mapping) msql, whatever) To me, this is three tier. The second tier can be partitioned across several tiers and servers. All of the tiers can run on 1 to N servers as your needs dictate. Lastly, serveral JSQL servers can run on serveral different hosts accessing the the same or different databases on the local or remote (via Ingres/Net) hosts. Let me know if you disagree. Cheers, Mike Leo Caribou Lake Software mal@visi.com