How to Execute a WHERE…IN Subquery Using Doctrine 2's Query Builder?

Leveraging Doctrine 2's Query Builder for WHERE…IN Subqueries

This guide demonstrates how to construct a Doctrine 2 query to select unique order items containing a specific item. The equivalent SQL query is:

<code class="language-sql">SELECT DISTINCT i.id, i.name, order.name 
FROM items i 
JOIN orders o ON i.order_id=o.id 
WHERE o.id IN (
   SELECT o2.id FROM orders o2
   JOIN items i2 ON i2.order_id=o2.id AND i2.id=5
)
AND i.id != 5
ORDER BY o.orderdate DESC
LIMIT 10</code>

Here's how to replicate this using Doctrine 2's query builder:

<code class="language-php">/** @var Doctrine\ORM\EntityManager $em */
$expr = $em->getExpressionBuilder();
$qb = $em->createQueryBuilder();
$qb->select(array('DISTINCT i.id', 'i.name', 'o.name'))
   ->from('Item', 'i')
   ->join('i.order', 'o')
   ->where(
       $expr->in(
           'o.id',
           $qb->createSubquery()
               ->select('o2.id')
               ->from('Order', 'o2')
               ->join('o2.items', 'i2') // Assuming a proper relationship
               ->where($expr->eq('i2.id', '?1'))
               ->getDQL()
       )
   )
   ->andWhere($expr->neq('i.id', '?2'))
   ->orderBy('o.orderdate', 'DESC')
   ->setMaxResults(10) // Use setMaxResults for LIMIT
   ->setParameter(1, 5)
   ->setParameter(2, 5);

$query = $qb->getQuery();
$results = $query->getResult();</code>

This improved query builder code uses a subquery more efficiently. It assumes a correctly defined relationship between Order and Item entities. setMaxResults(10) is used instead of relying on potential subquery limitations. Remember that the entities Item and Order must exist within your Doctrine 2 mappings. Thorough testing is still recommended to handle potential edge cases.

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