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Date: Thu, 25 Aug 2005 22:01:56 -0700
From: Craig Russell <Craig.Russell@Sun.COM>
Subject: Re: Minutes: JDO TCK Conference Call Friday, Aug 19, 9 am PST
In-reply-to: <200508201025.08092.andy@jpox.org>
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Hi Andy,

On Aug 20, 2005, at 2:25 AM, Andy Jefferson wrote:

>> CollectionOfObject doesn't work JDO-121. AI: Need feedback from Erik
>> or Andy.
>>
>
> Feedback : CollectionCollections has a field Object1 that is a
> Collection<SimpleClass> embedded in the join table. The TCK is  
> expecting a
> schema with join table having columns for the FK back to the owner  
> object,
> and the fields for the element. JPOX looks at this from a different  
> angle and
> requires a PK on this join table and so, since we don't have an id  
> for the
> embedded SimpleClass, we add an "adapter index" column to form the  
> PK. As has
> been discussed in the past, the user has no obvious way of saying  
> that they
> don't want a PK applying to the join table. They have the <primary- 
> key>
> element but that is only currently for specifying the pk name.

There is a natural PK for the join table. It's a combination of the  
FK plus the column mapped to the id field. If this were defined to be  
the PK for the join table in the schema, would that work?

Craig

>
> In addition, since the test is using java.util.Collection, which  
> can allow
> duplicates, the JDO impl can utilise an "adapter index" in the same  
> way to
> allow duplicates in the join table.
>
>
>
> -- 
> Andy
> Java Persistent Objects - JPOX
>

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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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; ">Hi Andy,<DIV><BR><DIV><DIV>On =
Aug 20, 2005, at 2:25 AM, Andy Jefferson wrote:</DIV><BR =
class=3D"Apple-interchange-newline"><BLOCKQUOTE type=3D"cite"><BLOCKQUOTE =
type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">CollectionOfObject doesn't work =
JDO-121. AI: Need feedback from Erik</DIV><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">or =
Andy.</DIV> <BR></BLOCKQUOTE><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: =
14px; "><BR></DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">Feedback : CollectionCollections =
has a field Object1 that is a<SPAN =
class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; =
">Collection&lt;SimpleClass&gt; embedded in the join table. The TCK is =
expecting a<SPAN class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">schema with join table having columns for the FK =
back to the owner object,<SPAN =
class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">and the =
fields for the element. JPOX looks at this from a different angle =
and<SPAN class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">requires a PK on this join table and so, since we =
don't have an id for the<SPAN =
class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">embedded =
SimpleClass, we add an "adapter index" column to form the PK. As =
has<SPAN class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">been discussed in the past, the user has no obvious =
way of saying that they<SPAN =
class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">don't =
want a PK applying to the join table. They have the =
&lt;primary-key&gt;<SPAN =
class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">element =
but that is only currently for specifying the pk =
name.</DIV></BLOCKQUOTE><DIV><BR =
class=3D"khtml-block-placeholder"></DIV>There is a natural PK for the =
join table. It's a combination of the FK plus the column mapped to the =
id field. If this were defined to be the PK for the join table in the =
schema, would that work?</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Craig</DIV><DIV><BR><BLOCKQUO=
TE type=3D"cite"><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">In addition, since the test is using =
java.util.Collection, which can allow<SPAN =
class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; =
">duplicates, the JDO impl can utilise an "adapter index" in the same =
way to<SPAN class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">allow duplicates in the join table.</DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; =
min-height: 14px; "><BR></DIV><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: =
14px; "><BR></DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">--<SPAN =
class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; =
">Andy</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">Java Persistent Objects - =
JPOX</DIV> <BR =
class=3D"Apple-interchange-newline"></BLOCKQUOTE></DIV><BR><DIV> <P =
style=3D"margin: 0.0px 0.0px 0.0px 0.0px"><FONT face=3D"Helvetica" =
size=3D"3" style=3D"font: 12.0px Helvetica">Craig Russell</FONT></P> <P =
style=3D"margin: 0.0px 0.0px 0.0px 0.0px"><FONT face=3D"Helvetica" =
size=3D"3" style=3D"font: 12.0px Helvetica">Architect, Sun Java =
Enterprise System <A =
href=3D"http://java.sun.com/products/jdo">http://java.sun.com/products/jdo=
</A></FONT></P> <P style=3D"margin: 0.0px 0.0px 0.0px 0.0px"><FONT =
face=3D"Helvetica" size=3D"3" style=3D"font: 12.0px Helvetica">408 =
276-5638 <A =
href=3D"mailto:Craig.Russell@sun.com">mailto:Craig.Russell@sun.com</A></FO=
NT></P> <P style=3D"margin: 0.0px 0.0px 0.0px 0.0px"><FONT =
face=3D"Helvetica" size=3D"3" style=3D"font: 12.0px Helvetica">P.S. A =
good JDO? O, Gasp!</FONT></P>  </DIV><BR></DIV></BODY></HTML>=

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