--- /dev/null
+<?php
+
+namespace Drupal\{{ machine_name }}\Form;
+
+use Drupal\Core\Database\Connection;
+use Drupal\Core\Form\ConfirmFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a confirmation form before clearing out the examples.
+ */
+class {{ class }} extends ConfirmFormBase {
+
+ /**
+ * The database connection.
+ *
+ * @var \Drupal\Core\Database\Connection
+ */
+ protected $connection;
+
+ /**
+ * Constructs new {{ class }} object.
+ *
+ * @param \Drupal\Core\Database\Connection $connection
+ * The database connection.
+ */
+ public function __construct(Connection $connection) {
+ $this->connection = $connection;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('database')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFormId() {
+ return '{{ form_id }}';
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getQuestion() {
+ return $this->t('Are you sure you want to delete all examples?');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getCancelUrl() {
+ return new Url('system.admin');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $this->connection->delete('examples')->execute();
+ drupal_set_message($this->t('The examples have been deleted.'));
+ $form_state->setRedirectUrl($this->getCancelUrl());
+ }
+
+}