update all string

Hi dear X*Nai, i download with your site addon “BDB delete swith”, this very cool addon for plagins, but me need exactly, but only with “Update”, say me pliz what part a code prevens me ‘update’ all the line?

class PDb_Record_Delete_Switch {

  private $update_switch_field_name = 'update_record';

  private $participant_record_ubdate;
	
  public function __construct()
  {

    add_action( 'pdb-after_submit_update', array($this, 'check_for_update') );

    add_filter( 'pdb-register_global_event', array($this, 'register_events'), 30 );
  } 
 private function process_deletion()
  {
    global $wpdb;
    $sql = 'UPDATE FROM *' . Participants_Db::$participants_table . ' WHERE <code>id_person</code> < 0';
    $success = $wpdb->query( $wpdb->prepare( $sql, $this->participant_record_update['id_person'] ) );

    // if we're debugging, dump the query to the log
    if ( PDB_DEBUG )
      error_log( __METHOD__ . ' query: ' . $wpdb->last_query );

    if ( $success ) {

      Participants_Db::$plugin_options['no_record_error_message'] = __( 'Все записи обновлены.' );

      do_action( 'pdb-record-delete-switch_record_deleted', $this->participant_record_update );
    }
  }

lic function register_events()
  {
    return array(
        'pdb-record-delete-switch_record_deleted' => __( 'User Record UPDATE' ),
    );
  }

}

new PDb_Record_Delete_Switch();

P.s You ask why would I do that? – in order for the user to be able to update their records(after the” update ” user record rises to the first position), if you know how to do it differently, then share the decision pliz