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Add note about debugging DQL queries.

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Benjamin Eberlei 2012-02-20 10:48:57 +01:00
parent 361c88d6ea
commit 35ded56fdd
1 changed files with 18 additions and 0 deletions
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en/reference/faq.rst
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@ -204,3 +204,21 @@ No, it is not supported to sort by function in DQL. If you need this functionali
use a native-query or come up with another solution. As a side note: Sorting with ORDER BY RAND() is painfully slow
starting with 1000 rows.
A Query fails, how can I debug it?
----------------------------------
First, if you are using the QueryBuilder you can use
``$queryBuilder->getDQL()`` to get the DQL string of this query. The
corresponding SQL you can get from the Query instance by calling
``$query->getSQL()``.
.. code-block:: php
<?php
$dql = "SELECT u FROM User u";
$query = $entityManager->createQuery($dql);
var_dump($query->getSQL());
$qb = $entityManager->createQueryBuilder();
$qb->select('u')->from('User', 'u');
var_dump($qb->getDQL());