private void performUpdate(HttpServletRequest request, HttpServletResponse response) throws Exception {
User user = AuthenticationUtils.getUserFromRequest(request);
String tableName = getTableNameFromRequest(request);
DbTableAccess tableAccess = DbTableAccess.getAccess(dbSecurity, tableName, new DbUserAdaptor(user));
List<RecordSelector> whereMap = getRecordSelectorsFromRequest(request);
Map<String,String> setterMap = getSetParametersMap(request);
JSONArray updatedObjects = tableAccess.update(whereMap, setterMap);
JSONObject obj = new JSONObject();
obj.put("updated", updatedObjects);
sendJsonResponse(response, obj);