Doctrine Query Builder, "between" expression and subquery - symfony

Question

I'm trying to create a quite complex query with Doctrine's Query Builder (I'm using Doctrine 2.2). In the model, i have a Distributor class and a DistributorVisit class with a one-to-many relationship. Every time a Distributor is visited by a representative, a new row is added to the DistributorVisit table with the visit date. An ER diagram of the two tables can be found here.
Now i want to be able to filter Distributors by their last visit date. So the user enters a date range (last visit from and last visit to) and Distributors whose last visit date is between those two dates are listed. I'm using Doctrine's Query Builder because there are a lot of other conditional queries I do in the filter, and I found the object-oriented approach to work best in this scenario. Here's what i did in the DistributorRepository class:
$qb = $this->getEntityManager()->createQueryBuilder()
->select('o')
->from('MyBundle:Distributor', 'o');
// Lots of 'andWhere's here
$qbv = $this->getEntityManager()->createQueryBuilder();
$qb->andWhere($qb->expr()->between(
$qbv->select($qbv->expr()->max('v.visitDate'))
->from('MyBundle:DistributorVisit', 'v')
->join('MyBundle:Distributor', 'o2',
Join::WITH,
$qbv->expr()->andX(
$qbv->expr()->eq('o2.id', 'v.distributorId'),
$qbv->expr()->eq('o2.id', 'o.id')
))
->getDQL(),
$filter->getLastVisitFrom()->getTimestamp(),
$filter->getLastVisitTo()->getTimestamp()
));
This gives me the following error:
[Syntax Error] line 0, col 83: Error: Expected Literal, got 'SELECT'
I guess this is because the Query Builder expects a literal where my sub-select is, however, the result of the sub-query should be a literal, right? May it be because the Query Builder does not add parenthesis accordingly?
Thanks a lot for your help.

Answer 1

I now resolved the issue the following way:
$qb = $this->getEntityManager()->createQueryBuilder()
->select('o')
->from('MyBundle:Distributor', 'o');
$qbdv = $this->getEntityManager()->createQueryBuilder();
$qbdv->select('MAX(dv2.visitDate)')
->from('MyBundle:DistributorVisit', 'dv2')
->where($qbdv->expr()->eq('dv2.distributor', 'o'));
$maxVisitDate = '('.$qbdv->getDQL().')';
$qb->leftJoin(
'o.distributorVisits',
'dv',
Join::WITH,
$qb->expr()->eq('dv.visitDate', $maxVisitDate)
);
$qb->andWhere(
$qb->expr()->between(
'dv.visitDate',
':dateFrom',
':dateTo'
)
)
->setParameter('dateFrom', $filter->getLastVisitFrom())
->setParameter('dateTo', $filter->getLastVisitTo());
So what I basically did is the following: I joined the DistributorVisit table to the Distributor table with the maximum visit date. The trick was the fact that one can pass the DQL of a (sub-)query ($qb1->getDQL()) directly to a Doctrine expression ($qb2->expr()->eq('column', $qb1->getDQL()). I did this with the left join in the code above.

Answer 2

I guess that your current DQL looks like this:
SELECT ..
FROM ..
WHERE SELECT .. FROM .. BETWEEN .. AND ..
But should look like this:
SELECT ..
FROM ..
WHERE (SELECT .. FROM ..) BETWEEN .. AND ..
To fix your code, i'd just put the subquery's dql inside parentheses:
$subQueryDQL = $qbv->select($qbv->expr()->max('v.visitDate'))
->from('MyBundle:DistributorVisit', 'v')
...
->getDQL();
$qb->andWhere($qb->expr()->between(
sprintf('(%s)', $subQueryDQL),
$filter->getLastVisitFrom()->getTimestamp(),
$filter->getLastVisitTo()->getTimestamp()
));

Answer 3

My case:
$qb->andWhere(
"t.field BETWEEN (
{$subQuerybuilder1->getDQL()}
) AND (
{$subQuerybuilder2->getDQL()}
)
");
Got:
SELECT ... WHERE t.field BETWEEN (
SELECT t1.field FROM t1
) AND (
SELECT t2.field FROM t2
)