Drupal 8 lotus.install Task 20

<?php

use Drupal\Core\Database\Database;

function lotus_update_8001(&$sandbox) {
  $spec = [
    'type' => 'varchar',
    'description' => "New Col",
    'length' => 20,
    'not null' => FALSE,
  ]; 
  $schema = Database::getConnection()->schema();
  $schema->addField('lotus', 'newcol', $spec);
  $schema->addIndex('lotus', ['newcol']);
}

function lotus_update_8002(&$sandbox) {
  $spec = array(
    'description' => 'My description',
    'fields' => array(
      'myfield1' => array(
        'description' => 'Myfield1 description.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'myfield2' => array(
        'description' => 'Myfield2 description',
        'type' => 'text',
        'not null' => TRUE,
      ),
    ),
    'primary key' => array('myfield1'),
  ); 
 $schema = Database::getConnection()->schema();
 $schema->createTable('lotustwo', $spec);
}

function lotus_post_update_change_title_of_node() {
  $node = \Drupal::entityManager()->loadEntityByUuid('FC0C01C6-B758-450D-A1BC-93D91D7786CB');
  $node->setTitle('hello world');
  $node->save();

  return t('Node successfully updated.');
}