Path: csiph.com!x330-a1.tempe.blueboxinc.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!news.linkpendium.com!news.linkpendium.com!newsfeeds.ihug.co.nz!lust.ihug.co.nz!ihug.co.nz!not-for-mail From: Lawrence D'Oliveiro Newsgroups: comp.lang.java.programmer Subject: Re: ORM or JDBC? Followup-To: comp.lang.java.programmer Date: Sat, 02 Apr 2011 15:44:11 +1300 Organization: Geek Central Lines: 17 Message-ID: References: <0c5037ee-f217-487c-9760-affd4bb6f181@n10g2000yqf.googlegroups.com> <4d8afdfe$0$41117$e4fe514c@news.xs4all.nl> <4d8ca45b$0$65870$e4fe514c@news.xs4all.nl> <4d8d53b1$0$23765$14726298@news.sunsite.dk> <4d90373e$0$81476$e4fe514c@news.xs4all.nl> <7rudncLSMpvB0A3QnZ2dnUVZ876dnZ2d@telenor.com> NNTP-Posting-Host: 118-92-92-183.dsl.dyn.ihug.co.nz Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8Bit X-Trace: lust.ihug.co.nz 1301712252 25018 118.92.92.183 (2 Apr 2011 02:44:12 GMT) X-Complaints-To: abuse@ihug.co.nz NNTP-Posting-Date: Sat, 2 Apr 2011 02:44:12 +0000 (UTC) User-Agent: KNode/4.4.7 Xref: x330-a1.tempe.blueboxinc.net comp.lang.java.programmer:2709 In message , Arved Sandstrom wrote: > A conceptual model equates to a business model. You might have entities > for Person, Address, and LifeEvent, say. There is just enough > information in the description of each to support a _business-level_ > discussion of relationships and identifying information and extra > information. > > It's in the logical model that, assuming we are talking about a > relational logical data model, that we might say that Person has > person_id as a primary key, that there's a M:N between Person and > Address and we describe the join table, there's a 1:N between Person and > LifeEvent, we specify exactly what the tables are and what columns > exist, what columns are foreign keys, and so forth. I still don’t see how you separate between “conceptual” and “logical”. One flows from the other; there is no boundary between them.