Doctrine DBAL 2: fetchAll() unnecessary array dimensions - php

Question

In doctrine DBAL2 when I execute a query like this:
<?php
$connection = $this->getDatabaseConnection();
$sql = "SELECT page_url
FROM cms_user_page
WHERE site_id = :siteid
AND active = '1'
";
$stmt = $connection->prepare($sql);
$stmt->bindValue("siteid", $id);
$stmt->execute();
return $stmt->fetchAll();
?>
I get a result like this:
Array
(
[0] => Array
(
[page_url] => index.php?action=login
)
[1] => Array
(
[page_url] => index.php?action=shoppingcart
)
[2] => Array
(
[page_url] => index.php?action=products
)
)
My question is, is there a fetch mode that produces an result like this:
Array
(
[0] => index.php?action=login
[1] => index.php?action=shoppingcart
[2] => index.php?action=products
)
I could not find any info about fetch modes in the documentation. and i could do an array map. But thats overhead in my opinion..

Answer 1

You can pass a fetch mode parameter to fetchAll().
$stmt->fetchAll(\PDO::FETCH_COLUMN)

Answer 2

This answer has been edited because this answer is correct.
You can use the FETCH_COLUMN fetch mode in fetchAll():
$stmt->fetchAll(\PDO::FETCH_COLUMN)
As another user points out in the comments, fetchAll() can return data formatted in a multitude of interesting formats.
Or you can iterate with fetchColumn():
while($page_url = $stmt->fetchColumn()) {
echo $page_url . PHP_EOL;
}

Answer 3

As of PHP5.5 you could use aray_column to achieve required result like so:
<?php
$connection = $this->getDatabaseConnection();
$sql = "SELECT page_url
FROM cms_user_page
WHERE site_id = :siteid
AND active = '1'
";
$stmt = $connection->prepare($sql);
$stmt->bindValue("siteid", $id);
$stmt->execute();
$data = array_column($stmt->fetchAll(), 'page_url');
return $data;

Answer 4

If you have more than one case where you need that form of result, although i dont really understand the sense too, you could implement AbstractHydrator interface to create your own ArrayHydrator that returns the structure as you need it.
Hydration Classes reside in NS:
Doctrine\ORM\Internal\Hydration

Answer 5

It looks like fetchAll was made deprecated in a recent version of DBAL. However I found another method called fetchFirstColumn which appears to do the same thing as fetchAll(\PDO::FETCH_COLUMN). I am currently on version 2.11.1 Doctrine DBAL.
I am using it like this in Symfony:
$statement = $connection->prepare('SELECT foo FROM bar WHERE baz = :baz');
$statement->execute([':baz' => 1]);
$result = $statement->fetchFirstColumn();
The value of $result will be a numerically indexed array starting at 0 like this:
[
0 => 'foo1',
1 => 'foo2'
];

Answer 6

As soon as you're requesting multiple rows in a database it does not make sense.
RDBMS stores rows and columns so the result is represented as rows and columns.
In the programming world it is called a matrix, in the PHP world it is an array.
________________
| id | name |
|______|_________|
| 1 | foo |
|______|_________|
| 2 | bar |
|______|_________|
will results in
array(
0 => array(
'id' => 1,
'name' => 'foo',
),
1 => array(
'id' => 2,
'name' => 'foo',
)
);
So no, you can't do that, you'd rather to process the result to fit your needs.