Home » Php » php – Fetch multi-row, single-column array using Doctrine

php – Fetch multi-row, single-column array using Doctrine

Posted by: admin July 12, 2020 Leave a comment

Questions:

I have a Doctrine fetch statement like this

$query = "SELECT id FROM table LIMIT 2";
$result = $db->fetchAll($query);

which returns the array like this:

Array
(
[0] => Array
    (
        [id] => 1
    )

[1] => Array
    (
        [id] => 2
    )
)

Since the only column I fetch is ID, I don’t need the array scope do be that deep. Is there a convenient way of making Doctrine return the results in a “flat” array, similar to what what PDO does:

$result = $db->query($query)->fetchAll(PDO::FETCH_COLUMN);

will return

Array
(
    [0] => 1
    [1] => 2
)

Currently I am flattening it using

$result = call_user_func_array('array_merge', array_map("array_values", $result));
How to&Answers:

You can simply use the PDO functionality (at least if you have MySQL).

$ids = $db
    ->executeQuery($query)
    ->fetchAll(\PDO::FETCH_COLUMN)
;

Answer:

To resolve this problem you have to make your custom doctrine hydrator.

  1. First: Make your own hydrator
<?php
namespace MyProject\Hydrators;

use Doctrine\ORM\Internal\Hydration\AbstractHydrator;

class CustomHydrator extends AbstractHydrator
{
    protected function _hydrateAll()
    {
        return $this->_stmt->fetchAll(PDO::FETCH_COLUMN);
    }
}
  1. Add your hydrator to Doctrine configuration file :
<?php
$em->getConfiguration()->addCustomHydrationMode('CustomHydrator','MyProject\Hydrators\CustomHydrator');
  1. Finaly you can use your cutom hidrator :
<?php
$query = $em->createQuery('SELECT u FROM CmsUser u');
$results = $query->getResult('CustomHydrator');

Answer:

Fetch the data using fetchAssoc:

$result = $db->query($query)->fetchAssoc(PDO::FETCH_COLUMN);

You will get an Array like this:

Array ( 
    [id] => 11
)