I have a multilingual database(inspired from here, the 3rd option .)
My database schema looks like this:
Article: (id, fk_name, fk_description, fk_reference, fk_um)
Translation: (id)
TranslationText: (id, fk_translation, fk_language,text)
Language (id, name)
Article --(M:1)--> Translation --(1:M)--> TranslationText --(M:1)--> Language
I'm using Symfony 2 with Doctrine and i need a report for all Articles in a certain language(passsed as parameter).
The problem appers when an Article has a Name , Description or Reference in a particular language but doesn't have Um (at least not in the language requested).
My best aproach so far is this SQL that i can't implement in Doctrine 2 due to the lack of nested joins.( language_id = 28 )
select ing.*
, tx_name.text, tx_description.text, tx_reference.text, tx_um.text
from Article ing
left join (Translation t_name left
join TranslationText tx_name
on t_name.id = tx_name.fk_translation
and tx_name.fk_language = 28)
on ing.fk_name = t_name.id
left join (Translation t_description
left join TranslationText tx_description
on t_description.id = tx_description.fk_translation
and tx_description.fk_language = 28)
on ing.fk_description = t_description.id
left join (Translation t_reference
left join TranslationText tx_reference
on t_reference.id = tx_reference.fk_translation
and tx_reference.fk_language = 28)
on ing.fk_reference = t_reference.id
left join (Translation t_um
left join TranslationText tx_um
on t_um.id = tx_um.fk_translation
and tx_um.fk_language = 28)
on ing.fk_um = t_um.id
;
Is there anyway to simplify the query and to make it work in Doctrine's DQL ?
Kind Regards,
Dan Cearnau
I'll try to write your query without subselects(subjoins): The indented join are at the same level of dbms pov, but for us are dependent on previous tables.
select ing.*
, tx_name.text
, tx_description.text
, tx_reference.text
, tx_um.text
from Article ing
left join Translation t_name on ing.fk_name = t_name.id
left join TranslationText tx_name
on (t_name.id = tx_name.fk_translation
and tx_name.fk_language = 28)
left join Translation t_description on ing.fk_description = t_description.id
left join TranslationText tx_description
on (t_description.id = tx_description.fk_translation
and tx_description.fk_language = 28)
left join Translation translation_reference on ing.fk_reference = translation_reference.id
left join TranslationText tx_reference
on (translation_reference.id = tx_reference.fk_translation
and tx_reference.fk_language = 28)
left join Translation translation_um on ing.fk_um = translation_um.id
left join TranslationText tx_um
on (translation_um.id = tx_um.fk_translation
and tx_um.fk_language = 28);
Also, I think your model is overnormalized. For me, this is better:
Article: (id, another_columns)
TranslationText: (fk_article_id, fk_language,name_text, description_text, reference_text, um_text)
Language (id, name)
As I see now, this is the model indicate in the most voted answer for the question indicated in your link
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