updated.install

<?php
/**
 * @file
 * Install, Uninstall, Update, and Requirements functions for update module.
 */

/**
 * Implements hook_install().
 */
function updated_install() {
  // Add a show_updated column to the node table.
  db_add_field('node', 'show_updated', array(
    'type' => 'int',
    'not null' => TRUE,
    'default' => 0,
  ));
  // Add a show_updated column to the node_revision table.
  db_add_field('node_revision', 'show_updated', array(
    'type' => 'int',
    'not null' => TRUE,
    'default' => 0,
  ));
}

/**
 * Implements hook_uninstall().
 */
function updated_uninstall() {
  // Remove show_updated column from node table.
  db_drop_field('node', 'show_updated');
  // Remove show_updated column from node_revision table.
  db_drop_field('node_revision', 'show_updated');
}

/**
 * Convert variables to config.
 */
function updated_update_1000() {
  $config = config("updated.settings");
  foreach (node_type_get_types() as $type) {
    $variable_name = 'node_updated_' . $type->name;
    if ($value = update_variable_get($variable_name, NULL)) {
      $config->set($type->name, $value)->save();
    }
    update_variable_del($variable_name);
  }
}