public int update() {
   session.commit(true);
   Database db = session.getDatabase();
   session.getUser().checkRight(table, Right.ALL);
   table.checkSupportAlter();
   table.renameColumn(column, newName);
   table.setModified();
   db.update(session, table);
   for (DbObject child : table.getChildren()) {
     if (child.getCreateSQL() != null) {
       db.update(session, child);
     }
   }
   return 0;
 }