class TableSortExampleController

class TableSortExampleController extends ControllerBase {
    
    /**
     * The Database Connection.
     *
     * @var \Drupal\Core\Database\Connection
     */
    protected $database;
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        $controller = new static($container->get('database'));
        $controller->setStringTranslation($container->get('string_translation'));
        return $controller;
    }
    
    /**
     * TableSortExampleController constructor.
     *
     * @param \Drupal\Core\Database\Connection $database
     *   The database connection.
     */
    public function __construct(Connection $database) {
        $this->database = $database;
    }
    
    /**
     * A simple controller method to explain what the tablesort example is about.
     */
    public function description() {
        // We are going to output the results in a table with a nice header.
        $header = [
            // The header gives the table the information it needs in order to make
            // the query calls for ordering. TableSort uses the field information
            // to know what database column to sort by.
[
                'data' => $this->t('Numbers'),
                'field' => 't.numbers',
            ],
            [
                'data' => $this->t('Letters'),
                'field' => 't.alpha',
            ],
            [
                'data' => $this->t('Mixture'),
                'field' => 't.random',
            ],
        ];
        // Using the TableSort Extender is what tells  the query object that we
        // are sorting.
        $query = $this->database
            ->select('tablesort_example', 't')
            ->extend('Drupal\\Core\\Database\\Query\\TableSortExtender');
        $query->fields('t');
        // Don't forget to tell the query object how to find the header information.
        $result = $query->orderByHeader($header)
            ->execute();
        $rows = [];
        foreach ($result as $row) {
            // Normally we would add some nice formatting to our rows
            // but for our purpose we are simply going to add our row
            // to the array.
            $rows[] = [
                'data' => (array) $row,
            ];
        }
        // Build the table for the nice output.
        $build = [
            '#markup' => '<p>' . t('The layout here is a themed as a table
           that is sortable by clicking the header name.') . '</p>',
        ];
        $build['tablesort_table'] = [
            '#theme' => 'table',
            '#header' => $header,
            '#rows' => $rows,
        ];
        return $build;
    }

}