Return-Path: Delivered-To: apmail-db-jdo-dev-archive@www.apache.org Received: (qmail 72315 invoked from network); 11 Jun 2007 17:07:07 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.2) by minotaur.apache.org with SMTP; 11 Jun 2007 17:07:07 -0000 Received: (qmail 95156 invoked by uid 500); 11 Jun 2007 17:07:09 -0000 Mailing-List: contact jdo-dev-help@db.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: jdo-dev@db.apache.org Delivered-To: mailing list jdo-dev@db.apache.org Received: (qmail 95124 invoked by uid 99); 11 Jun 2007 17:07:08 -0000 Received: from herse.apache.org (HELO herse.apache.org) (140.211.11.133) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 11 Jun 2007 10:07:08 -0700 X-ASF-Spam-Status: No, hits=0.0 required=10.0 tests=UNPARSEABLE_RELAY X-Spam-Check-By: apache.org Received-SPF: pass (herse.apache.org: local policy) Received: from [192.18.43.132] (HELO sca-es-mail-1.sun.com) (192.18.43.132) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 11 Jun 2007 10:07:04 -0700 Received: from fe-sfbay-09.sun.com ([192.18.43.129]) by sca-es-mail-1.sun.com (8.13.7+Sun/8.12.9) with ESMTP id l5BH6ice003835 for ; Mon, 11 Jun 2007 10:06:44 -0700 (PDT) Received: from conversion-daemon.fe-sfbay-09.sun.com by fe-sfbay-09.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) id <0JJH00601DWWZ100@fe-sfbay-09.sun.com> (original mail from Craig.Russell@Sun.COM) for jdo-dev@db.apache.org; Mon, 11 Jun 2007 10:06:44 -0700 (PDT) Received: from [10.0.253.253] ([192.18.37.228]) by fe-sfbay-09.sun.com (Sun Java System Messaging Server 6.2-8.04 (built Feb 28 2007)) with ESMTPSA id <0JJH00I3BE6Z5130@fe-sfbay-09.sun.com> for jdo-dev@db.apache.org; Mon, 11 Jun 2007 10:06:36 -0700 (PDT) Date: Mon, 11 Jun 2007 10:06:33 -0700 From: Craig L Russell Subject: Referential integrity Sender: Craig.Russell@Sun.COM To: Apache JDO project , JDO Expert Group Message-id: <0CAE3983-0970-44B6-B307-BD8E4FE00A0D@Sun.COM> MIME-version: 1.0 X-Mailer: Apple Mail (2.752.3) Content-type: multipart/signed; protocol="application/pkcs7-signature"; boundary=Apple-Mail-23--736552492; micalg=sha1 X-Virus-Checked: Checked by ClamAV on apache.org --Apple-Mail-23--736552492 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed The JDO 2.0 specification requires that changes to one side of a relationship that is mapped to a single database artifact (e.g. mapping Department.employees and Employee.department to the same column) will affect both sides of the relationship both in the database and in memory. Is there interest in extending this concept to other datastores in which the relationships are not mapped to the same artifact? We might have to provide some metadata aside from "mapped-by" in case the relationships are inverse. Perhaps use an attribute "inverse" at the same level as "mapped-by"? Craig Craig Russell Architect, Sun Java Enterprise System http://java.sun.com/products/jdo 408 276-5638 mailto:Craig.Russell@sun.com P.S. A good JDO? 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