How to Register custom DQL Functions

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Doctrine allows you to specify custom DQL functions. For more information on this topic, read Doctrine's cookbook article DQL User Defined Functions.

In Symfony, you can register your custom DQL functions as follows:

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        # config/packages/doctrine.yaml
doctrine:
    orm:
        # ...
        dql:
            string_functions:
                test_string: App\DQL\StringFunction
                second_string: App\DQL\SecondStringFunction
            numeric_functions:
                test_numeric: App\DQL\NumericFunction
            datetime_functions:
                test_datetime: App\DQL\DatetimeFunction
    

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        <!-- config/packages/doctrine.xml -->
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:doctrine="http://symfony.com/schema/dic/doctrine"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/doctrine
        https://symfony.com/schema/dic/doctrine/doctrine-1.0.xsd">

    <doctrine:config>
        <doctrine:orm>
            <!-- ... -->
            <doctrine:dql>
                <doctrine:string-function name="test_string">App\DQL\StringFunction</doctrine:string-function>
                <doctrine:string-function name="second_string">App\DQL\SecondStringFunction</doctrine:string-function>
                <doctrine:numeric-function name="test_numeric">App\DQL\NumericFunction</doctrine:numeric-function>
                <doctrine:datetime-function name="test_datetime">App\DQL\DatetimeFunction</doctrine:datetime-function>
            </doctrine:dql>
        </doctrine:orm>
    </doctrine:config>
</container>
    

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        // config/packages/doctrine.php
use App\DQL\DatetimeFunction;
use App\DQL\NumericFunction;
use App\DQL\SecondStringFunction;
use App\DQL\StringFunction;

$container->loadFromExtension('doctrine', [
    'orm' => [
        // ...
        'dql' => [
            'string_functions' => [
                'test_string'   => StringFunction::class,
                'second_string' => SecondStringFunction::class,
            ],
            'numeric_functions' => [
                'test_numeric' => NumericFunction::class,
            ],
            'datetime_functions' => [
                'test_datetime' => DatetimeFunction::class,
            ],
        ],
    ],
]);
    

Note

In case the entity_managers were named explicitly, configuring the functions with the ORM directly will trigger the exception Unrecognized option "dql" under "doctrine.orm". The dql configuration block must be defined under the named entity manager.

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        # config/packages/doctrine.yaml
doctrine:
    orm:
        # ...
        entity_managers:
            example_manager:
                # Place your functions here
                dql:
                    datetime_functions:
                        test_datetime: App\DQL\DatetimeFunction
    

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        <!-- config/packages/doctrine.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:doctrine="http://symfony.com/schema/dic/doctrine"
    xsi:schemaLocation="http://symfony.com/schema/dic/services
        https://symfony.com/schema/dic/services/services-1.0.xsd
        http://symfony.com/schema/dic/doctrine
        https://symfony.com/schema/dic/doctrine/doctrine-1.0.xsd">

    <doctrine:config>
        <doctrine:orm>
            <!-- ... -->

            <doctrine:entity-manager name="example_manager">
                <!-- place your functions here -->
                <doctrine:dql>
                    <doctrine:datetime-function name="test_datetime">
                        App\DQL\DatetimeFunction
                    </doctrine:datetime-function>
                </doctrine:dql>
            </doctrine:entity-manager>
        </doctrine:orm>
    </doctrine:config>
</container>
    

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        // config/packages/doctrine.php
use App\DQL\DatetimeFunction;

$container->loadFromExtension('doctrine', [
    'orm' => [
        // ...
        'entity_managers' => [
            'example_manager' => [
                // place your functions here
                'dql' => [
                    'datetime_functions' => [
                        'test_datetime' => DatetimeFunction::class,
                    ],
                ],
            ],
        ],
    ],
]);
    

Caution

DQL functions are instantiated by Doctrine outside of the Symfony service container so you can't inject services or parameters into a custom DQL function.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.

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