FAQ
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@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
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  • Andrus Adamchik at Jan 5, 2011 at 6:21 pm
    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@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 email in error and that any use, dissemination, forwarding, printing, or copying of this email is strictly prohibited. If you have received this email in error please notify Carlos Fazenda by telephone on +351 210 438 686
  • Bruno René Santos at Jan 5, 2011 at 11:38 pm
    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
    Bruno
    --
    Bruno René Santos | brunorene@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 email in error and that any use, dissemination, forwarding, printing, or copying of this email is strictly prohibited. If you have received this email in error please notify Carlos Fazenda by telephone on +351 210 438 686

    --
    Bruno René Santos | brunorene@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 email in error and that any use,
    dissemination, forwarding, printing, or copying of this email is
    strictly prohibited. If you have received this email in error please
    notify Bruno René Santos by telephone on +351 210 438 686
  • Andrus Adamchik at Jan 6, 2011 at 9:13 am
    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
    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
    Bruno
    --
    Bruno René Santos | brunorene@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 email in error and that any use, dissemination, forwarding, printing, or copying of this email is strictly prohibited. If you have received this email in error please notify Carlos Fazenda by telephone on +351 210 438 686

    --
    Bruno René Santos | brunorene@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 email in error and that any use, dissemination, forwarding, printing, or copying of this email is strictly prohibited. If you have received this email in error please notify Bruno René Santos by telephone on +351 210 438 686
  • Bruno René Santos at Jan 6, 2011 at 9:48 am
    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,

    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
    Bruno
    --
    Bruno René Santos | brunorene@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 email in error and that any use, dissemination, forwarding, printing, or copying of this email is strictly prohibited. If you have received this email in error please notify Carlos Fazenda by telephone on +351 210 438 686
    --
    Bruno René Santos | brunorene@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 email in error and that any use, dissemination, forwarding, printing, or copying of this email is strictly prohibited. If you have received this email in error please notify Bruno René Santos by telephone on +351 210 438 686

    --
    Bruno René Santos | brunorene@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 email in error and that any use,
    dissemination, forwarding, printing, or copying of this email is
    strictly prohibited. If you have received this email in error please
    notify Bruno René Santos by telephone on +351 210 438 686

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groupuser @
categoriescayenne
postedJan 5, '11 at 12:15a
activeJan 6, '11 at 9:48a
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websitecayenne.apache.org

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