How to Order Results Using MySQL\'s FIELD Function in Doctrine 2?

Ordering by MySQL FIELD Function in Doctrine 2

Doctrine 2 does not natively support the MySQL FIELD function out of the box. To utilize it, you can leverage custom string functions provided by extensions.

DoctrineExtensions Solution:

The DoctrineExtensions library includes a custom string function named 'FIELD' that emulates the MySQL FIELD function. To implement this, add the following configuration:

<code class="php">$doctrineConfig = $this->em->getConfiguration();
$doctrineConfig->addCustomStringFunction('FIELD', 'DoctrineExtensions\Query\Mysql\Field');</code>

Usage:

The FIELD function can be used in SELECT, WHERE, and BETWEEN clauses. While it cannot be directly used in ORDER BY, a workaround involves adding an additional field in the SELECT clause and ordering by that field instead:

<code class="php">$qb
    ->select("r, field(r.id, " . implode(", ", $ids) . ") as HIDDEN field")
    ->from("Entities\Round", "r")
    ->where($qb->expr()->in("r.id", $ids))
    ->orderBy("field");</code>

By specifying HIDDEN in the SELECT clause, you can avoid having the additional field appear in the result row. This allows you to order values efficiently within the IN expression using Doctrine 2.2.

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