Connection.php

<?php

namespace Drupal\driver_test\Driver\Database\DrivertestMysqlDeprecatedVersion;

use Drupal\Core\Database\Driver\mysql\Connection as CoreConnection;

/**
 * MySQL test implementation of \Drupal\Core\Database\Connection.
 */
class Connection extends CoreConnection {
    
    /**
     * Constructs a Connection object.
     */
    public function __construct(\PDO $connection, array $connection_options = []) {
        // Alias the MySQL classes to avoid having unnecessary copies.
        foreach ([
            'Delete',
            'Insert',
            'Merge',
            'Schema',
            'Upsert',
            'Select',
            'Update',
        ] as $class) {
            class_alias('Drupal\\Core\\Database\\Driver\\mysql\\' . $class, 'Drupal\\driver_test\\Driver\\Database\\DrivertestMysqlDeprecatedVersion\\' . $class);
        }
        parent::__construct($connection, $connection_options);
    }
    
    /**
     * Hardcoded database server version.
     *
     * Faking that we are on a deprecated database.
     *
     * @var string
     */
    protected $databaseVersion = '5.5.2';
    
    /**
     * {@inheritdoc}
     */
    public function driver() {
        return 'DrivertestMysqlDeprecatedVersion';
    }
    
    /**
     * {@inheritdoc}
     */
    public function version() {
        return $this->databaseVersion;
    }

}