如何得到一维标量数组作为dql查询结果?
我想从 Auction 表的 id 列中获取一组值.如果这是一个原始 SQL,我会写:
从拍卖中选择id
但是当我在 Doctrine 中这样做并执行时:
$em->createQuery("SELECT a.id FROM Auction a")->getScalarResult();
我得到一个这样的数组:
数组(数组('id' => 1),数组('id' => 2),)
相反,我想要一个这样的数组:
数组(1、2)
我如何使用 Doctrine 做到这一点?
解决方案PHP 5.5
您可以使用 array_map
,并且由于每个数组只有一个项目,因此您可以优雅地使用'current'
作为回调,而不是写一个 闭包.
$result = $em->createQuery("SELECT a.id FROM Auction a")->getScalarResult();$ids = array_map('current', $result);
<块引用>
有关内存使用的其他信息,请参阅Petr Sobotka 在下面的回答.
PHP >= 5.5
作为 jcbwlkr 在下面的回答,推荐使用 array_column
的方式.
I want to get an array of values from the id column of the Auction table. If this was a raw SQL I would write:
SELECT id FROM auction
But when I do this in Doctrine and execute:
$em->createQuery("SELECT a.id FROM Auction a")->getScalarResult();
I get an array like this:
array(
array('id' => 1),
array('id' => 2),
)
Instead, i'd like to get an array like this:
array(
1,
2
)
How can I do that using Doctrine?
解决方案PHP < 5.5
You can use array_map
, and since you only have on item per array, you can elegantly use
'current'
as callback, instead of writing a closure.
$result = $em->createQuery("SELECT a.id FROM Auction a")->getScalarResult();
$ids = array_map('current', $result);
See Petr Sobotka's answer below for additional info regarding memory usage.
PHP >= 5.5
As jcbwlkr's answered below, the recommended way it to use array_column
.
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