webform.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the Webform module.
 */

// Webform install helper functions.
include_once 'includes/webform.install.inc';

// Webform requirements.
include_once 'includes/webform.install.requirements.inc';

// Webform update hooks.
include_once 'includes/webform.install.update.inc';

/**
 * Implements hook_uninstall().
 */
function webform_uninstall() {
  // Issue #2793597: uninstall error You have requested a non-existent service
  // "webform.email_provider".
  // Workaround: Don't use the webform.email_provider in hook_uninstall().
  // @see \Drupal\webform\WebformEmailProvider::uninstall()
  $config = \Drupal::configFactory()->getEditable('system.mail');
  $mail_plugins = $config->get('interface');
  unset($mail_plugins['webform']);
  $config->set('interface', $mail_plugins)->save();
}

/**
 * Implements hook_schema().
 *
 * Even though Webform's are config entities we need to create a 'webform' table
 * to track webform submission serial numbers using DB transaction locking.
 *
 * @see \Drupal\webform\WebformEntityStorage
 */
function webform_schema() {
  $schema['webform'] = [
    'description' => 'Stores all webform data.',
    'fields' => [
      'webform_id' => [
        'description' => 'The webform id.',
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
      ],
      'next_serial' => [
        'description' => 'The serial number to give to the next submission to this webform.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 1,
      ],
    ],
    'primary key' => ['webform_id', 'next_serial'],
  ];
  return $schema;
}