dbDelete example

  protected function updateLocation($string) {
    if ($locations = $string->getLocations(TRUE)) {
      $created = FALSE;
      foreach ($locations as $type => $location) {
        foreach ($location as $name => $lid) {
          // Make sure that the name isn't longer than 255 characters.           $name = substr($name, 0, 255);
          if (!$lid) {
            $this->dbDelete('locales_location', ['sid' => $string->getId(), 'type' => $type, 'name' => $name])
              ->execute();
          }
          elseif ($lid === TRUE) {
            // This is a new location to add, take care not to duplicate.             $this->connection->merge('locales_location', $this->options)
              ->keys(['sid' => $string->getId(), 'type' => $type, 'name' => $name])
              ->fields(['version' => \Drupal::VERSION])
              ->execute();
            $created = TRUE;
          }
          // Loaded locations have 'lid' integer value, nor FALSE, nor TRUE.