Caching

A Doctrine\DBAL\Connection can automatically cache result sets. The feature is optional though, and by default, no result set is cached.

To use the result cache, there are three mandatory steps:

1. Configure a global result cache, or provide one at query time.
2. Provide a cache profile for the result set you want to cache when making a query.

Configuring the result cache

Any instance of Psr\Cache\CacheItemPoolInterface can be used as a result cache and can be set on the configuration object (optionally it can also be passed at query time):

::

<?php
$cache = new \Symfony\Component\Cache\Adapter\ArrayAdapter();
$config = $conn->getConfiguration();
$config->setResultCache($cache);

Note that this documentation uses Symfony Cache in all examples. Any other cache implementation that follows the PSR-6 standard can be used instead.

Providing a cache profile

To get the result set of a query cached, it is necessary to pass a Doctrine\DBAL\Cache\QueryCacheProfile instance to the executeQuery() or executeCacheQuery() methods. The difference between these two methods is that the former has the cache profile as an optional argument, whereas it is required when calling the latter:

::

<?php
$stmt = $conn->executeQuery($query, $params, $types, new QueryCacheProfile(0, "some key"));
$stmt = $conn->executeCacheQuery($query, $params, $types, new QueryCacheProfile(0, "some key"));

As stated before, it is also possible to pass in a Psr\Cache\CacheItemPoolInterface instance into the constructor of Doctrine\DBAL\Cache\QueryCacheProfile in which case it overrides the default cache instance:

::

<?php
$cache = new \Symfony\Component\Cache\Adapter\FilesystemAdapter();
new QueryCacheProfile(0, "some key", $cache);