drupal/core/modules/comment/comment.install

<?php

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

/**
 * Implements hook_uninstall().
 */
function comment_uninstall() {
  // Remove variables.
  variable_del('comment_block_count');
  $node_types = array_keys(node_type_get_types());
  \Drupal::entityManager()->addNamespaces(new ArrayIterator(array(
    'Drupal\comment' => DRUPAL_ROOT . '/core/modules/comment/lib',
  )));
  drupal_classloader_register('comment', 'core/modules/comment');
  foreach ($node_types as $node_type) {
    entity_invoke_bundle_hook('delete', 'comment', 'comment_node_' . $node_type);
    variable_del('comment_' . $node_type);
    variable_del('comment_anonymous_' . $node_type);
    variable_del('comment_controls_' . $node_type);
    variable_del('comment_default_mode_' . $node_type);
    variable_del('comment_default_order_' . $node_type);
    variable_del('comment_default_per_page_' . $node_type);
    variable_del('comment_form_location_' . $node_type);
    variable_del('comment_preview_' . $node_type);
    variable_del('comment_subject_field_' . $node_type);
  }

  // Remove states.
  \Drupal::state()->delete('comment.node_comment_statistics_scale');
}

/**
 * Implements hook_enable().
 */
function comment_enable() {
  // Insert records into the node_comment_statistics for nodes that are missing.
  $query = db_select('node_field_data', 'n');
  $query->leftJoin('node_comment_statistics', 'ncs', 'ncs.nid = n.nid AND n.default_langcode = 1');
  $query->addField('n', 'created', 'last_comment_timestamp');
  $query->addField('n', 'uid', 'last_comment_uid');
  $query->addField('n', 'nid');
  $query->addExpression('0', 'comment_count');
  $query->addExpression('NULL', 'last_comment_name');
  $query->isNull('ncs.comment_count');

  db_insert('node_comment_statistics')
    ->from($query)
    ->execute();
}

/**
 * Implements hook_modules_enabled().
 *
 * Creates comment body fields for node types existing before the Comment module
 * is enabled. We use hook_modules_enabled() rather than hook_enable() so we can
 * react to node types of existing modules, and those of modules being enabled
 * both before and after the Comment module in the loop of module_enable().
 *
 * There is a separate comment bundle for each node type to allow for
 * per-node-type customization of comment fields. Each one of these bundles
 * needs a comment body field instance. A comment bundle is needed even for
 * node types whose comments are disabled by default, because individual nodes
 * may override that default.
 *
 * @see comment_node_type_insert()
 */
function comment_modules_enabled($modules) {
  // Only react if the Comment module is one of the modules being enabled.
  // hook_node_type_insert() is used to create body fields while the comment
  // module is enabled.
  if (in_array('comment', $modules)) {
    // Create comment body fields for each node type, if needed.
    foreach (node_type_get_types() as $type => $info) {
      _comment_body_field_create($info);
    }
  }
}

/**
 * Implements hook_schema().
 */
function comment_schema() {
  $schema['comment'] = array(
    'description' => 'Stores comments and associated data.',
    'fields' => array(
      'cid' => array(
        'type' => 'serial',
        'not null' => TRUE,
        'description' => 'Primary Key: Unique comment ID.',
      ),
      'uuid' => array(
        'description' => 'Unique Key: Universally unique identifier for this entity.',
        'type' => 'varchar',
        'length' => 128,
        'not null' => FALSE,
      ),
      'pid' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The {comment}.cid to which this comment is a reply. If set to 0, this comment is not a reply to an existing comment.',
      ),
      'nid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The {node}.nid to which this comment is a reply.',
      ),
      'uid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The {users}.uid who authored the comment. If set to 0, this comment was created by an anonymous user.',
      ),
      'subject' => array(
        'type' => 'varchar',
        'length' => 64,
        'not null' => TRUE,
        'default' => '',
        'description' => 'The comment title.',
      ),
      'hostname' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
        'description' => "The author's host name.",
      ),
      'created' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The time that the comment was created, as a Unix timestamp.',
      ),
      'changed' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The time that the comment was last edited, as a Unix timestamp.',
      ),
      'status' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 1,
        'size' => 'tiny',
        'description' => 'The published status of a comment. (0 = Not Published, 1 = Published)',
      ),
      'thread' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'description' => "The alphadecimal representation of the comment's place in a thread, consisting of a base 36 string prefixed by an integer indicating its length.",
      ),
      'name' => array(
        'type' => 'varchar',
        'length' => 60,
        'not null' => FALSE,
        'description' => "The comment author's name. Uses {users}.name if the user is logged in, otherwise uses the value typed into the comment form.",
      ),
      'mail' => array(
        'type' => 'varchar',
        'length' => 64,
        'not null' => FALSE,
        'description' => "The comment author's e-mail address from the comment form, if user is anonymous, and the 'Anonymous users may/must leave their contact information' setting is turned on.",
      ),
      'homepage' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => FALSE,
        'description' => "The comment author's home page address from the comment form, if user is anonymous, and the 'Anonymous users may/must leave their contact information' setting is turned on.",
      ),
      'langcode' => array(
        'description' => 'The {language}.langcode of this comment.',
        'type' => 'varchar',
        'length' => 12,
        'not null' => TRUE,
        'default' => '',
      ),
    ),
    'indexes' => array(
      'comment_status_pid' => array('pid', 'status'),
      'comment_num_new' => array('nid', 'status', 'created', 'cid', 'thread'),
      'comment_uid' => array('uid'),
      'comment_nid_langcode' => array('nid', 'langcode'),
      'comment_created' => array('created'),
    ),
    'primary key' => array('cid'),
    'unique keys' => array(
      'uuid' => array('uuid'),
    ),
    'foreign keys' => array(
      'comment_node' => array(
        'table' => 'node',
        'columns' => array('nid' => 'nid'),
      ),
      'comment_author' => array(
        'table' => 'users',
        'columns' => array('uid' => 'uid'),
      ),
    ),
  );

  $schema['node_comment_statistics'] = array(
    'description' => 'Maintains statistics of node and comments posts to show "new" and "updated" flags.',
    'fields' => array(
      'nid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The {node}.nid for which the statistics are compiled.',
      ),
      'cid' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The {comment}.cid of the last comment.',
      ),
      'last_comment_timestamp' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The Unix timestamp of the last comment that was posted within this node, from {comment}.changed.',
      ),
      'last_comment_name' => array(
        'type' => 'varchar',
        'length' => 60,
        'not null' => FALSE,
        'description' => 'The name of the latest author to post a comment on this node, from {comment}.name.',
      ),
      'last_comment_uid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The user ID of the latest author to post a comment on this node, from {comment}.uid.',
      ),
      'comment_count' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The total number of comments on this node.',
      ),
    ),
    'primary key' => array('nid'),
    'indexes' => array(
      'node_comment_timestamp' => array('last_comment_timestamp'),
      'comment_count' => array('comment_count'),
      'last_comment_uid' => array('last_comment_uid'),
    ),
    'foreign keys' => array(
      'statistics_node' => array(
        'table' => 'node',
        'columns' => array('nid' => 'nid'),
      ),
      'last_comment_author' => array(
        'table' => 'users',
        'columns' => array(
          'last_comment_uid' => 'uid',
        ),
      ),
    ),
  );

  return $schema;
}

/**
 * @addtogroup updates-7.x-to-8.x
 * @{
 */

/**
 * Renames {comment}.language to {comment}.langcode.
 */
function comment_update_8000() {
  db_drop_index('comment', 'comment_nid_language');
  $langcode_spec = array(
    'type' => 'varchar',
    'length' => 12,
    'not null' => TRUE,
    'default' => '',
    'description' => "Language code, e.g. 'de' or 'en-US'.",
  );
  db_change_field('comment', 'language', 'langcode', $langcode_spec);
  db_add_index('comment', 'comment_nid_langcode', array('nid', 'langcode'));
}

/**
 * Create a UUID column for comments.
 */
function comment_update_8001() {
  $spec = array(
    'description' => 'Unique Key: Universally unique identifier for this entity.',
    'type' => 'varchar',
    'length' => 128,
    'not null' => FALSE,
  );
  $keys = array(
    'unique keys' => array(
      'uuid' => array('uuid'),
    ),
  );
  // Account for sites having the contributed UUID module installed.
  if (db_field_exists('comment', 'uuid')) {
    db_change_field('comment', 'uuid', 'uuid', $spec, $keys);
  }
  else {
    db_add_field('comment', 'uuid', $spec, $keys);
  }
}

/**
 * Make *id fields unsigned.
 */
function comment_update_8002() {
  db_drop_index('comment', 'comment_num_new');
  db_drop_index('comment', 'comment_nid_langcode');
  db_change_field('comment', 'nid', 'nid',
    array(
      'type' => 'int',
      'unsigned' => TRUE,
      'not null' => TRUE,
      'default' => 0,
      'description' => 'The {node}.nid to which this comment is a reply.',
    ),
    array('indexes' => array(
      'comment_num_new' => array('nid', 'status', 'created', 'cid', 'thread'),
      'comment_nid_langcode' => array('nid', 'langcode'),
    ))
  );
  db_drop_index('comment', 'comment_uid');
  db_change_field('comment', 'uid', 'uid',
    array(
      'type' => 'int',
      'unsigned' => TRUE,
      'not null' => TRUE,
      'default' => 0,
      'description' => 'The {users}.uid who authored the comment. If set to 0, this comment was created by an anonymous user.',
    ),
    array('indexes' => array(
      'comment_uid' => array('uid'),
    ))
  );

  db_drop_index('node_comment_statistics', 'last_comment_uid');
  db_change_field('node_comment_statistics', 'last_comment_uid', 'last_comment_uid',
    array(
      'type' => 'int',
      'unsigned' => TRUE,
      'not null' => TRUE,
      'default' => 0,
      'description' => 'The user ID of the latest author to post a comment on this node, from {comment}.uid.',
    ),
    array('indexes' => array(
      'last_comment_uid' => array('last_comment_uid'),
    ))
  );
}

/**
 * Generate a UUID for all comments.
 */
function comment_update_8003(&$sandbox) {
  if (!isset($sandbox['progress'])) {
    $sandbox['progress'] = 0;
    $sandbox['last'] = 0;
    $sandbox['max'] = db_query('SELECT COUNT(cid) FROM {comment} WHERE uuid IS NULL')->fetchField();
  }

  $cids = db_query_range('SELECT cid FROM {comment} WHERE cid > :cid AND uuid IS NULL ORDER BY cid ASC', 0, 10, array(':cid' => $sandbox['last']))->fetchCol();
  update_add_uuids($sandbox, 'comment', 'cid', $cids);

  $sandbox['#finished'] = empty($sandbox['max']) ? 1 : ($sandbox['progress'] / $sandbox['max']);
}

/**
 * Convert variables to state.
 */
function comment_update_8004() {
  update_variables_to_state(array(
    'node_cron_comments_scale' => 'comment.node_comment_statistics_scale',
  ));
}

/**
 * @} End of "addtogroup updates-7.x-to-8.x".
 * The next series of updates should start at 9000.
 */