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Bruno René Santos | 5 Jan 2011 01:14
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Left Outer Joins without expressions

Hello all,

Is there any way to create a left outer join without using an actual 
path on the query expressions? I tried something like this:

query.addPrefetch(HoTiposFechoContas.TO_HO_TABLE_PROPERTY + 
"+").setSemantics(PrefetchTreeNode.JOINT_PREFETCH_SEMANTICS);

but cayenne raises an exception because of the concatenated '+' sign.

Regards
Bruno
--

-- 
Bruno René Santos | brunorene <at> holos.pt <mailto:brunorene <at> holos.pt> | 
Gestor de Projectos | Analista | Programador | Tech Hunter

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Andrus Adamchik | 5 Jan 2011 19:20
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Re: Left Outer Joins without expressions

IIRC in 3.0 PrefetchTreeNode.JOINT_PREFETCH_SEMANTICS generates an outer join by default (???)

Andrus

On Jan 5, 2011, at 2:14 AM, Bruno René Santos wrote:

> Hello all,
> 
> Is there any way to create a left outer join without using an actual path on the query expressions? I tried
something like this:
> 
> query.addPrefetch(HoTiposFechoContas.TO_HO_TABLE_PROPERTY + "+").setSemantics(PrefetchTreeNode.JOINT_PREFETCH_SEMANTICS);
> 
> but cayenne raises an exception because of the concatenated '+' sign.
> 
> Regards
> Bruno
> -- 
> Bruno René Santos | brunorene <at> holos.pt <mailto:brunorene <at> holos.pt> | Gestor de Projectos | Analista
| Programador | Tech Hunter
> 
> Holos - Soluções Avançadas em Tecnologias de Informação S.A.
> Parque de Ciência e Tecnologia de Almada/Setúbal . Edifício Madan Parque
> Rua dos Inventores . Quinta da Torre . 2825 - 182 Caparica . Portugal
> Phone: +351 210 438 686 . Fax: +351 210 438 687 . Web: www.holos.pt
> 
> 
> This email and any files transmitted with it are confidential and intended solely for the use of the
individual or entity to whom they are addressed. If you are not the intended recipient or the person
responsible for delivering the email to the intended recipient, be advised that you have received this
(Continue reading)

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Bruno René Santos | 6 Jan 2011 00:37
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Re: Left Outer Joins without expressions

Hello Andrus,

In Mysql the generated join is:

... from table1 join table2

which is an inner join... I needed a

... from table1 left join table2

Regards
Bruno

Em 05-01-2011 18:20, Andrus Adamchik escreveu:
> IIRC in 3.0 PrefetchTreeNode.JOINT_PREFETCH_SEMANTICS generates an outer join by default (???)
>
> Andrus
>
> On Jan 5, 2011, at 2:14 AM, Bruno René Santos wrote:
>
>> Hello all,
>>
>> Is there any way to create a left outer join without using an actual path on the query expressions? I tried
something like this:
>>
>> query.addPrefetch(HoTiposFechoContas.TO_HO_TABLE_PROPERTY + "+").setSemantics(PrefetchTreeNode.JOINT_PREFETCH_SEMANTICS);
>>
>> but cayenne raises an exception because of the concatenated '+' sign.
>>
>> Regards
(Continue reading)

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Andrus Adamchik | 6 Jan 2011 10:13
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Re: Left Outer Joins without expressions

Which version of Cayenne are you using?

I am checking our unit tests (Cayenne 3.1, but this part hasn't changed from 3.0) including simple to-one
and to-many joint prefetching and both generate outer joins:

 SELECT DISTINCT t0.DATE_OF_BIRTH, t0.ARTIST_ID, t0.ARTIST_NAME, t1.ESTIMATED_PRICE,
t1.PAINTING_DESCRIPTION, t1.PAINTING_TITLE, t1.ARTIST_ID, t1.GALLERY_ID, t1.PAINTING_ID FROM
ARTIST t0 LEFT JOIN PAINTING t1 ON (t0.ARTIST_ID = t1.ARTIST_ID) 

SELECT t0.ARTIST_ID, t0.PAINTING_ID, t0.GALLERY_ID, t0.PAINTING_DESCRIPTION,
t0.ESTIMATED_PRICE, t0.PAINTING_TITLE, t1.ARTIST_NAME, t1.DATE_OF_BIRTH, t1.ARTIST_ID FROM
PAINTING t0 LEFT JOIN ARTIST t1 ON (t0.ARTIST_ID = t1.ARTIST_ID) ORDER BY t0.PAINTING_ID 

Andrus

On Jan 6, 2011, at 1:37 AM, Bruno René Santos wrote:

> Hello Andrus,
> 
> In Mysql the generated join is:
> 
> ... from table1 join table2
> 
> which is an inner join... I needed a
> 
> ... from table1 left join table2
> 
> Regards
> Bruno
>
(Continue reading)

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Bruno René Santos | 6 Jan 2011 10:41
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Re: Left Outer Joins without expressions

Hello Andrus,

I am so sorry you are right Cayenne is generating outer joins. The 
problem was that i was checking one of the prefetches for a Many-to-one 
relationship where the second query uses an inner join to join the 
related table with the root table.

Thank you
Bruno

Em 06-01-2011 09:13, Andrus Adamchik escreveu:
> Which version of Cayenne are you using?
>
> I am checking our unit tests (Cayenne 3.1, but this part hasn't changed from 3.0) including simple to-one
and to-many joint prefetching and both generate outer joins:
>
>   SELECT DISTINCT t0.DATE_OF_BIRTH, t0.ARTIST_ID, t0.ARTIST_NAME, t1.ESTIMATED_PRICE,
t1.PAINTING_DESCRIPTION, t1.PAINTING_TITLE, t1.ARTIST_ID, t1.GALLERY_ID, t1.PAINTING_ID FROM
ARTIST t0 LEFT JOIN PAINTING t1 ON (t0.ARTIST_ID = t1.ARTIST_ID)
>
> SELECT t0.ARTIST_ID, t0.PAINTING_ID, t0.GALLERY_ID, t0.PAINTING_DESCRIPTION,
t0.ESTIMATED_PRICE, t0.PAINTING_TITLE, t1.ARTIST_NAME, t1.DATE_OF_BIRTH, t1.ARTIST_ID FROM
PAINTING t0 LEFT JOIN ARTIST t1 ON (t0.ARTIST_ID = t1.ARTIST_ID) ORDER BY t0.PAINTING_ID
>
> Andrus
>
> On Jan 6, 2011, at 1:37 AM, Bruno René Santos wrote:
>
>> Hello Andrus,
>>
(Continue reading)

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