Short and Simple: From time to time we send gifts to some of our users. I have a user table and a gift table with a many-to-many relationship. I want to fetch all users which did NOT receive a particular gift.
The following query however returns me all users and the gifts they've received, with the particular gift excluded.
$qb = $this->_em->createQueryBuilder();
$qb->select('u, g')
->from('Application\Entity\User', 'u')
->leftJoin('u.gifts', 'g')
->where('g.id != = :giftId')
->setParameter('giftId', 2);
If a user received a particular gift, I want to exclude that user from the result set. Is this possible with Doctrine2?
You first need to select all users, then exclude those who had your gift already:
SELECT
u
FROM
Application\Entity\User u
WHERE
u.id NOT IN(
SELECT
u2.id
FROM
Application\Entity\User u2
JOIN
u2.gifts g
WHERE
g.id = :giftId
)
In QueryBuilder API, it looks like following:
$qb1 = $em->createQueryBuilder();
$qb2 = $em->createQueryBuilder();
$qb2
->select('u2')
->from('Application\Entity\User', 'u2')
->join('u2.gifts', 'g')
->andWhere($qb2->expr()->eq('g.id', ':giftId');
$users = $qb1
->select('u')
->from('Application\Entity\User', 'u')
->andWhere($qb1->expr->in($qb2->getDQL())
->setParameter('giftId', $giftId)
->getQuery()
->getResult();
Also, I don't personally think the QueryBuilder is suited for this use case unless you have dynamic DQL. As you can see, the query gets quite complex, and at some point you're even falling back to QueryBuilder#getDQL, which builds the DQL string and makes recycling of $qb2 impossible.
Plain DQL works just fine here.
Related
I am using symfony 2.8.39 and Doctrine 2.4.8 and have problems with paged results. Underlying is an Mysql5.7 server.
The documentation on doctrine paging says:
Paginating Doctrine queries is not as simple as you might think in the
beginning. If you have complex fetch-join scenarios with one-to-many
or many-to-many associations using the "default" LIMIT functionality
of database vendors is not sufficient to get the correct results.
https://www.doctrine-project.org/projects/doctrine-orm/en/latest/tutorials/pagination.html
This is exactly the situation I have. My statement in SQL translation looks like this:
SELECT sc.id, sc.name, scc.prio, sd.description
FROM sang_contents sc
JOIN sang_categories_contents scc
JOIN sang_descriptions sd
JOIN sang_languages sl
WHERE
sc.id = scc.content_id AND
scc.category_id = 20 AND
scc.is_enabled = 1 AND
sc.id = sd.content_id AND
sd.language_id = sl.id AND
sd.description != "" AND
sl.name = "DE"
ORDER BY scc.prio ASC, sc.id DESC
As ORM is at Version 3.0 and this problem exists since the beginning I don't think it will be fixed anytime by ORM.
So what to do to achieve proper results for paging?
My idea to solve this is so far to paginate over simplified data the paging should be able to handle correctly:
create a table containing the result for all categories and languages and access it with an extra entity.
The disadvantage is, that I would have to update this table every time a change is done in the for connected tables.
Would you suggest another solution to this problem?
I guess 3rd party software like
https://github.com/KnpLabs/KnpPaginatorBundle/releases
or
https://github.com/whiteoctober/WhiteOctoberPagerfantaBundle/releases
are just sitting on top of the ORM pagination and would not fix the underlying problem.
Correct?
This is my code at the moment:
$page = max(0, $request->query->getInt('page', 0));
$pageRequest = new PageRequest($itemsPerPage, $page);
$query = $this->em->createQuery(
'SELECT sc, sd
FROM NamiApiCoreBundle:Content sc
JOIN sc.categoryContents scc
JOIN sc.descriptions sd
JOIN sd.language sl
WHERE
sc.id = scc.content AND
scc.category = :id AND
scc.enabled = 1 AND
sc.id = sd.content AND
sd.language = sl.id AND
sd.description != \'\' AND
sl.iso = :lang
ORDER BY scc.priority ASC, sc.id DESC'
)
->setFirstResult($pageRequest->getOffset())
->setParameter('lang', $lang)
->setParameter('id', $categoryId)
->useResultCache(true, $this->cache_lifetime);
if ($itemsPerPage > 0) {
$query->setMaxResults($pageRequest->getSize());
}
$paginator = new Paginator($query);
I have some One-To-Many, unidirectional with Join Table relationships in a Symfony App which I need to query and I can't figure out how to do that in DQL or Query Builder.
The Like entity doesn't have a comments property itself because it can be owned by a lot of different types of entities.
Basically I would need to translate something like this:
SELECT likes
FROM AppBundle:Standard\Like likes
INNER JOIN comment_like ON comment_like.like_id = likes.id
INNER JOIN comments ON comment_like.comment_id = comments.id
WHERE likes.created_by = :user_id
AND likes.active = 1
AND comments.id = :comment_id
I've already tried this but the join output is incorrect, it selects any active Like regardless of its association with the given comment
$this->createQueryBuilder('l')
->select('l')
->innerJoin('AppBundle:Standard\Comment', 'c')
->where('l.owner = :user')
->andWhere('c = :comment')
->andWhere('l.active = 1')
->setParameter('user', $user)
->setParameter('comment', $comment)
I see 2 options to resolve this:
Make relation bi-directional
Use SQL (native query) + ResultSetMapping.
For the last option, here is example of repository method (just checked that it works):
public function getLikes(Comment $comment, $user)
{
$sql = '
SELECT l.id, l.active, l.owner
FROM `like` l
INNER JOIN comment_like ON l.id = comment_like.like_id
WHERE comment_like.comment_id = :comment_id
AND l.active = 1
AND l.owner = :user_id
';
$rsm = new \Doctrine\ORM\Query\ResultSetMappingBuilder($this->_em);
$rsm->addRootEntityFromClassMetadata(Like::class, 'l');
return $this->_em->createNativeQuery($sql, $rsm)
->setParameter('comment_id', $comment->getId())
->setParameter('user_id', $user)
->getResult();
}
PS: In case of Mysql, 'like' is reserved word. So, if one wants to have table with name 'like' - just surround name with backticks on definition:
* #ORM\Table(name="`like`")
I find the Symfony documentation very poor about unidirectional queries.
Anyway I got it working by using DQL and sub-select on the owning entity, which is certainly not as fast. Any suggestion on how to improve that is more than welcomed!
$em = $this->getEntityManager();
$query = $em->createQuery('
SELECT l
FROM AppBundle:Standard\Like l
WHERE l.id IN (
SELECT l2.id
FROM AppBundle:Standard\Comment c
JOIN c.likes l2
WHERE c = :comment
AND l2.owner = :user
AND l2.active = 1
)'
)
->setParameter('user', $user)
->setParameter('comment', $comment)
;
I want to use DQL to create a query which looks like this in SQL:
select
e.*
from
e
inner join (
select
uuid, max(locale) as locale
from
e
where
locale = 'nl_NL' or
locale = 'nl'
group by
uuid
) as e_ on e.uuid = e_.uuid and e.locale = e_.locale
I tried to use QueryBuilder to generate the query and subquery. I think they do the right thing by them selves but I can't combine them in the join statement. Does anybody now if this is possible with DQL? I can't use native SQL because I want to return real objects and I don't know for which object this query is run (I only know the base class which have the uuid and locale property).
$subQueryBuilder = $this->_em->createQueryBuilder();
$subQueryBuilder
->addSelect('e.uuid, max(e.locale) as locale')
->from($this->_entityName, 'e')
->where($subQueryBuilder->expr()->in('e.locale', $localeCriteria))
->groupBy('e.uuid');
$queryBuilder = $this->_em->createQueryBuilder();
$queryBuilder
->addSelect('e')
->from($this->_entityName, 'e')
->join('('.$subQueryBuilder.') as', 'e_')
->where('e.uuid = e_.uuid')
->andWhere('e.locale = e_.locale');
You cannot put a subquery in the FROM clause of your DQL.
I will assume that your PK is {uuid, locale}, as of discussion with you on IRC. Since you also have two different columns in your query, this can become ugly.
What you can do is putting it into the WHERE clause:
select
e
from
MyEntity e
WHERE
e.uuid IN (
select
e2.uuid
from
MyEntity e2
where
e2.locale IN (:selectedLocales)
group by
e2.uuid
)
AND e.locale IN (
select
max(e3.locale) as locale
from
MyEntity e3
where
e3.locale IN (:selectedLocales)
group by
e3.uuid
)
Please note that I used a comparison against a (non empty) array of locales that you bind to to the :selectedLocales. This is to avoid destroying the query cache if you want to match against additional locales.
I also wouldn't suggest building this with the query builder if there's no real advantage in doing so since it will just make it simpler to break the query cache if you add conditionals dynamically (also, it's 3 query builders involved!)
I have several database tables with 2 primary keys, id and date. I do not update the records but instead insert a new record with the updated information. This new record has the same id and the date field is NOW(). I will use a product table to explain my question.
I want to be able to request the product details at a specific date. I therefore use the following subquery in DQL, which works fine:
WHERE p.date = (
SELECT MAX(pp.date)
FROM Entity\Product pp
WHERE pp.id = p.id
AND pp.date < :date
)
This product table has some referenced tables, like category. This category table has the same id and date primary key combination. I want to be able to request the product details and the category details at a specific date. I therefore expanded the DQL as shown above to the following, which also works fine:
JOIN p.category c
WHERE p.date = (
SELECT MAX(pp.date)
FROM Entity\Product pp
WHERE pp.id = p.id
AND pp.date < :date
)
AND c.date = (
SELECT MAX(cc.date)
FROM Entity\ProductCategory cc
WHERE cc.id = c.id
AND cc.date < :date
)
However, as you can see, if I have multiple referenced tables I will have to copy the same piece of DQL. I want to somehow add these subqueries to the entities so that every time an entity is called it adds this subquery.
I have thought of adding this in a __construct($date) or some kind of setUp($date) method, but I'm kind of stuck here. Also, would it help to add #Id to Entity\Product::date?
I hope someone can help me. I do not expect a complete solution, one step in a good direction would be very much appreciated.
I think I've found my solution. The trick was (first, to update to Doctrine 2.2 and) using a filter:
namespace Filter;
use Doctrine\ORM\Mapping\ClassMetaData,
Doctrine\ORM\Query\Filter\SQLFilter;
class VersionFilter extends SQLFilter {
public function addFilterConstraint(ClassMetadata $targetEntity, $targetTableAlias) {
$return = $targetTableAlias . '.date = (
SELECT MAX(sub.date)
FROM ' . $targetEntity->table['name'] . ' sub
WHERE sub.id = ' . $targetTableAlias . '.id
AND sub.date < ' . $this->getParameter('date') . '
)';
return $return;
}
}
Add the filter to the configuration:
$configuration->addFilter("version", Filter\VersionFilter");
And enable it in my repository:
$this->_em->getFilters()->enable("version")->setParameter('date', $date);
I want to implement this SQL using doctrine2 query builder:
SELECT c.*, COUNT(s.id) AS studentCount
FROM classes c
LEFT JOIN (
SELECT *
FROM student_classes
WHERE YEAR = '2012'
) sc ON c.id = sc.class_id
LEFT JOIN students s ON sc.student_id = s.id
GROUP BY c.id
I tried this one but didn't work
$qb = $this->getEntityManager()
->getRepository('Classes')
->createQueryBuilder('c');
$qb->select('c.id AS id, c.name AS name, COUNT(s) AS studentCount');
$qb->leftJoin(
$qb->select('sc1')
->from('StudentClasses', 'sc1')
->where('sc1.year = :year')
->setParameter('year', $inputYear),
'sc2'
);
$qb->leftJoin('sc2.students', 's');
$qb->groupBy('c.id');
return $qb->getQuery()->getScalarResult();
or should I use nativeSQL instead?
any help would be appreciated,
thanks.
What are you trying to do is really interesting, because JOIN on a SELECT seems to not be supported by Doctrine2 with DQL or QueryBuilder. Of course, you can try with a native query.
However, to answer to your question, I believe that you don't need to make a JOIN on a SELECT. Simply, JOIN on StudentClasses and then add a condition in the WHERE about the $year! The WHERE clause is made for that.
You can use WITH clause to join entity with additional check, For your subquery you can write the same using left join with year filter, In join part i have used c.studentClasses based on the assumption that in Classes entity you have some mapped property for StudentClasses entity
$qb = $this->getEntityManager()
->getRepository('Classes')
->createQueryBuilder('c');
$qb->select('c.id AS id, c.name AS name, COUNT(s) AS studentCount');
$qb->leftJoin('c.studentClasses','sc2', 'WITH', 'sc2.year = :year');
$qb->leftJoin('sc2.students', 's');
$qb->setParameter('year', $inputYear);
$qb->groupBy('c.id');