How to do a select query in LeftJoin querybuilder - php

Question

How can I convert below query to Doctrine:
SELECT restaurants.restaurant_name ,
restaurants.restaurant_id,
j.LASTPRICE
FROM restaurants
LEFT JOIN
(
SELECT f.food_id AS fid,
f.restaurants_restaurant_id AS rid,
Max(f.food_last_price) AS LASTPRICE
FROM foods AS f
LEFT JOIN restaurants AS r
ON r.restaurant_id = f.restaurants_restaurant_id
WHERE f.food_last_price IS NOT NULL
GROUP BY r.restaurant_id) j
ON restaurants.restaurant_id = j.rid
Here is my code:
$qb = $this->_em->createQueryBuilder();
$qb2 = $this->_em->createQueryBuilder();
$getMaxPercentage = $qb2
->select(
'MAX (Food.foodLastPrice) AS LASTPRICE ',
'Food.foodId AS fId',
'Food.restaurantsRestaurantId AS rID'
)
->from($this->entityClass,'Restaurant')
->innerJoin('Restaurant.foods','Food')
->where('Food.foodLastPrice IS NOT NULL')
->groupBy('Restaurant.restaurantId')
->getDQL();
$restaurantList = $qb
->select('Restaurants.restaurantName, Restaurants.restaurantId , j.LASTPRICE')
->from($this->entityClass,'Restaurants')
->leftJoin($getMaxPercentage,'j','WITH','Restaurants.restaurantId = j.rID')
->getQuery()->execute();
dd($restaurantList);
I give an error :
SELECT Restaurants.restaurantName,': Error: Class 'SELECT' is not defined.
I've already known I could set sub queries in main query, Although in this case I does not want to use sub query in Where expression. Any suggestion for using select in LeftJoin in doctrine?
EDITED : I've tried to use DQL in my query:
$query = $this->_em->createQuery(
'
SELECT Restaurants.restaurantName , Restaurants.restaurantId
FROM App\\Restaurant AS Restaurants
LEFT JOIN (
SELECT f.foodId AS fid,
f.restaurantsRestaurantId AS rid,
Max(f.foodLastPrice) AS LASTPRICE
FROM App\\Food AS f
LEFT JOIN App\\Restaurant AS r
WITH r.restaurantId = f.restaurantsRestaurantId
GROUP BY r.restaurantId) AS J
ON Restaurants.restaurantId = j.rid
');
But I gave an another error :
[Semantical Error] Error: Class '(' is not defined.
Is it possible to use select in left join in Doctrine?
EDITED 2 : I read a similar question and I've decided to write in another way :
$qb = $this->_em->createQueryBuilder();
$qb2 = $this->_em->createQueryBuilder();
$subSelect = $qb2
->select(
array(
'Food.foodLastPrice AS LASTPRICE ',
'Food.foodId AS fId',
'Food.restaurantsRestaurantId AS rId')
)
->from($this->entityClass,'Restaurant')
->innerJoin('Restaurant.foods','Food')
->where('Food.foodLastPrice IS NOT NULL')
->groupBy('Restaurant.restaurantId')
->getQuery()->getSQL();
$restaurantList =
$qb->select(
'Restaurant1'
)
->from($this->entityClass, 'Restaurant1')
->leftJoin('Restaurant1',sprintf('(%s)',$subSelect),'internalQuery','Restaurant1.restaurantId = internalQuery.rId')
->getQuery()->getSQL();
dd($restaurantList);
Again, I got an error:
near 'Restaurant1 (SELECT': Error: Class 'Restaurant1' is not defined.

Answer 1

What you're trying to do is impossible :
https://github.com/doctrine/doctrine2/issues/3542 (november 2013, but doctrine concept didn't change since and doctrinebot closed this on 7 Dec 2015)
DQL is about querying objects. Supporting subselects in the FROM
clause means that the DQL parser is not able to build the result set
mapping anymore (as the fields returned by the subquery may not match
the object anymore). This is why it cannot be supported (supporting it
only for the case you run the query without the hydration is a no-go
IMO as it would mean that the query parsing needs to be dependant of
the execution mode).
In your case, the best solution is probably to run a SQL query instead
(as you are getting a scalar, you don't need the ORM hydration anyway)
You can find workarounds like raw sql, or rethinking your query.