How to Use the MySQL FIELD Function with Doctrine 2?

Using Doctrine 2 FIELD Function in Order By

Doctrine 2 does not natively support the MySQL FIELD function. However, there is an extension available that adds this functionality.

Using the DoctrineExtension

To use the FIELD function in Doctrine 2, you can install the DoctrineExtensions package. Once installed, you need to add the following configuration to your Doctrine configuration:

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

After adding this configuration, you can use the FIELD function in your Doctrine queries.

Example

The following example shows how to use the FIELD function to order a query by a set of values:

<code class="php">$qb = $em->createQueryBuilder();

$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>

This query will return the results ordered by the FIELD value, which will be 1 for the first value in the $ids array, 2 for the second value, and so on.

Note:

The FIELD function can only be used in SELECT, WHERE, and BETWEEN clauses. It cannot be used in ORDER BY clauses. To work around this limitation, the example above uses a hidden field to store the FIELD value.

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