public function Sql::getHighestId

Returns the highest ID tracked by the implementing plugin.

Return value

int The highest ID.

Overrides HighestIdInterface::getHighestId

File

core/modules/migrate/src/Plugin/migrate/id_map/Sql.php, line 1038

Class

Sql

Namespace

Code

public function getHighestId() {

  // Ensure that the first ID is an integer.
  $keys = $this->migration
    ->getDestinationPlugin()
    ->getIds();
  if (reset($keys)['type'] !== 'integer') {
    throw new \LogicException('To determine the highest migrated ID the first ID must be an integer');
  }

  // List of mapping tables to look in for the highest ID.
  $map_tables = [
    $this->migration
      ->id() => $this
      ->mapTableName(),
  ];

  // If there's a bundle, it means we have a derived migration and we need to
  // find all the mapping tables from the related derived migrations.
  if ($base_id = substr($this->migration
    ->id(), 0, strpos($this->migration
    ->id(), $this::DERIVATIVE_SEPARATOR))) {
    $migrations = $this->migrationPluginManager
      ->getDefinitions();
    foreach ($migrations as $migration_id => $migration) {
      if ($migration['id'] === $base_id) {

        // Get this derived migration's mapping table and add it to the list
        // of mapping tables to look in for the highest ID.
        $stub = $this->migrationPluginManager
          ->createInstance($migration_id);
        $map_tables[$migration_id] = $stub
          ->getIdMap()
          ->mapTableName();
      }
    }
  }

  // Get the highest id from the list of map tables.
  $ids = [
    0,
  ];
  foreach ($map_tables as $map_table) {

    // If the map_table does not exist then continue on to the next map_table.
    if (!$this
      ->getDatabase()
      ->schema()
      ->tableExists($map_table)) {
      continue;
    }
    $query = $this
      ->getDatabase()
      ->select($map_table, 'map')
      ->fields('map', $this
      ->destinationIdFields())
      ->range(0, 1);
    foreach (array_values($this
      ->destinationIdFields()) as $order_field) {
      $query
        ->orderBy($order_field, 'DESC');
    }
    $ids[] = $query
      ->execute()
      ->fetchField();
  }

  // Return the highest of all the mapped IDs.
  return (int) max($ids);
}