TYPO3 Extbase Join - sql

Question

I'm try to make this query with extbase work:
SELECT a.*
FROM tx_apartments_domain_model_apartment a
LEFT
JOIN tx_apartments_domain_model_booking b
ON b.apartment = a.uid
AND b.start <= '2018-07-23'
AND b.end >= '2018-07-21'
WHERE b.uid IS NULL AND a.hidden=0 AND a.deleted=0;
the following code does not work, i get an empty result:
/** #var QueryBuilder $queryBuilder */
$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
->getQueryBuilderForTable('tx_apartments_domain_model_apartment');
$statement = $queryBuilder
->select('a.*')
->from('tx_apartments_domain_model_apartment','a')
->leftJoin(
'a',
'tx_apartments_domain_model_booking',
'b',
$queryBuilder->expr()->andX(
$queryBuilder->expr()->eq('b.apartment','a.uid'),
$queryBuilder->expr()->lte('b.start', '2018-07-23'),
$queryBuilder->expr()->gte('b.end', '2018-07-21')
)
)
->where(
$queryBuilder->expr()->isNull('b.uid')
)
->execute();
//DebuggerUtility::var_dump($queryBuilder->getSQL());
return $statement->fetchAll();
can anybody help me?

Answer 1

What kind of records do you expect to get?
as uid is a mandantory field you never have records where the uid is NULL.
If you want to access new records which are not stored to the database yet: they get a faked uid like NEW123

Answer 2

This works for me:
/** #var QueryBuilder $queryBuilder */
$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
->getQueryBuilderForTable('tx_apartments_domain_model_apartment');
$queryBuilder
->getRestrictions()
->removeAll();
$statement = $queryBuilder
->select('a.*')
->from('tx_apartments_domain_model_apartment','a')
->leftJoin(
'a',
'tx_apartments_domain_model_booking',
'b',
$queryBuilder->expr()->andX(
$queryBuilder->expr()->eq('b.apartment','a.uid'),
$queryBuilder->expr()->lte('b.start', $queryBuilder->createNamedParameter('2018-07-23')),
$queryBuilder->expr()->gte('b.end', $queryBuilder->createNamedParameter('2018-07-21'))
)
)
->where(
$queryBuilder->expr()->andX(
$queryBuilder->expr()->isNull('b.uid'),
$queryBuilder->expr()->eq('a.hidden',0),
$queryBuilder->expr()->eq('a.deleted',0)
)
)
->execute();
$results = $statement->fetchAll();
// DebuggerUtility::var_dump($queryBuilder->getSQL());
// DebuggerUtility::var_dump($results);
return $results;

Answer 3

I do not know where exactly you are using this code. Typically I would think that retrieving records from the database should happen in a repository.
If you are using this in the ApartmentRepository and if there is a relation properly configured between apartments and bookings (1:n, I would assume) in the TCA, then you could use something like this:
public function findInDateRange ($dateConstraint)
{
$query = $this->createQuery();
$constraints = [];
$constraints[] = $query->lessThanOrEqual(
'bookings.start',
$dateConstraint['start']
);
$constraints[] = $query->greaterThanOrEqual(
'bookings.end',
$dateConstraint['end']
);
$query->matching($query->logicalAnd($constraints));
return $query->execute();
}
I deliberately left out the b.uid IS NULL part here, as that should always return nothing since uid should be AUTO_INCREMENT. Unless the default query settings are changed, there is also no need to check the disable fields (hidden, deleted) manually.
Note that in order for this to work, the Apartment Domain Model needs a field bookings with a corresponding column in the database (that is something I stumbled over last year).
As a side-note: Is it intentional that you allow for the end to be before the start in your query (start: 2018-07-23, end: 2018-07-21), or is that just exemplary?