# Program additional checks

### Database example

First you have to write a PHP class in your plugin that contains the logic. It is important that the interface `` `HealthCheckInterface` `` is implemented.

```php
namespace ShopStudio\HealthCheck\Core\HealthCheck;

use Doctrine\DBAL\Connection;

class DatabaseHealthCheck implements HealthCheckInterface
{
    public const NAME = 'database';

    private Connection $connection;

    public function __construct(Connection $connection)
    {
        $this->connection = $connection;
    }

    public function getName(): string
    {
        return self::NAME;
    }

    public function check(): ?HealthCheckResult
    {
        $up = true;

        try {
            $this->connection->executeQuery($this->connection->getDatabasePlatform()->getDummySelectSQL());
        } catch (\Throwable $throwable) {
            $up = false;
        }

        return new HealthCheckResult($up, ['additional' => 'payload']);
    }
}

```

Then implement the PHP class as a service in services.xml. Don't forget to tag the service as `shop-studio.health-check.`

```xml
<?xml version="1.0" ?>

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

        <service id="ShopStudio\HealthCheck\Core\HealthCheck\DatabaseHealthCheck">
            <argument type="service" id="Doctrine\DBAL\Connection" />
            <tag name="shop-studio.health-check"/>
        </service>

    </services>
</container>

```


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