Return-Path: Delivered-To: apmail-db-jdo-dev-archive@www.apache.org Received: (qmail 94731 invoked from network); 20 Dec 2005 21:23:57 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (209.237.227.199) by minotaur.apache.org with SMTP; 20 Dec 2005 21:23:57 -0000 Received: (qmail 45100 invoked by uid 500); 20 Dec 2005 21:23:56 -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 45089 invoked by uid 99); 20 Dec 2005 21:23:56 -0000 Received: from asf.osuosl.org (HELO asf.osuosl.org) (140.211.166.49) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 20 Dec 2005 13:23:56 -0800 X-ASF-Spam-Status: No, hits=0.0 required=10.0 tests=HTML_MESSAGE,UNPARSEABLE_RELAY X-Spam-Check-By: apache.org Received-SPF: pass (asf.osuosl.org: local policy) Received: from [192.18.98.36] (HELO brmea-mail-4.sun.com) (192.18.98.36) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 20 Dec 2005 13:23:55 -0800 Received: from fe-amer-02.sun.com ([192.18.108.176]) by brmea-mail-4.sun.com (8.12.10/8.12.9) with ESMTP id jBKLNYD7021027 for ; Tue, 20 Dec 2005 14:23:34 -0700 (MST) Received: from conversion-daemon.mail-amer.sun.com by mail-amer.sun.com (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) id <0IRT00K01F49SD00@mail-amer.sun.com> (original mail from Craig.Russell@Sun.COM) for jdo-dev@db.apache.org; Tue, 20 Dec 2005 14:23:34 -0700 (MST) Received: from [129.145.133.145] by mail-amer.sun.com (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPSA id <0IRT00EGRFF9QI00@mail-amer.sun.com> for jdo-dev@db.apache.org; Tue, 20 Dec 2005 14:23:34 -0700 (MST) Date: Tue, 20 Dec 2005 13:23:31 -0800 From: Craig L Russell Subject: [VOTE] Issue 139: Add attribute field-type to element field Sender: Craig.Russell@Sun.COM To: JDO Expert Group , Apache JDO project Message-id: MIME-version: 1.0 X-Mailer: Apple Mail (2.746.2) Content-type: multipart/signed; protocol="application/pkcs7-signature"; boundary=Apple-Mail-49-40305633; micalg=sha1 X-Virus-Checked: Checked by ClamAV on apache.org X-Spam-Rating: minotaur.apache.org 1.6.2 0/1000/N --Apple-Mail-49-40305633 Content-Type: multipart/alternative; boundary=Apple-Mail-48-40305058 --Apple-Mail-48-40305058 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes; format=flowed Javadogs, This will resolve an issue in the TCK where fields of type Object =20 cannot be stored because there is no standard way to map them, even =20 if usage restricts the type of instances assigned to the field. This =20 is an issue in particular for relational mappings of classes that use =20= interfaces or Object in the class definition. This proposal would allow more specific field type to be specified at =20= deployment time compared to compile time. For example, a field of =20 type Object could be specified in the jdo metadata as containing only =20= instances of type SimpleClass. 18.14 ELEMENT field The field-type attribute is used to specify a more restrictive type =20 than the field definition in the class. This might be required in =20 order to map the field to the datastore. To be portable, specify the =20 name of a single type that is itself able to be mapped to the =20 datastore (e.g. a field of type Object can specify field-=20 type=3D=94Integer=94). Other values for this attribute are not defined. 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? O, Gasp! --Apple-Mail-48-40305058 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=WINDOWS-1252

This will = resolve an issue in the TCK where fields of type Object cannot be stored = because there is no standard way to map them, even if usage restricts = the type of instances assigned to the field. This is an issue in = particular for relational mappings of classes that use interfaces or = Object in the class definition.=A0

This proposal = would allow more specific field type to be specified at deployment time = compared to compile time. For example, a field of type Object could be = specified in the jdo metadata as containing only instances of type = SimpleClass.

18.14 ELEMENT = field

<!ATTLIST field field-type = CDATA #IMPLIED>

The field-type attribute is = used to specify a more restrictive type than the field definition in the = class. This might be required in order to map the field to the = datastore. To be portable, specify the name of a single type that is = itself able to be mapped to the datastore (e.g. a field of type Object = can specify field-type=3D=94Integer=94). Other values for this attribute = are not defined.

</proposal>

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? O, Gasp!

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