Method do_check

sql/sys_vars.h:907–958

    DBUG_ASSERT(size == sizeof(ulonglong));
  }
  bool do_check(THD *thd, set_var *var)
  {
    char buff[STRING_BUFFER_USUAL_SIZE];
    String str(buff, sizeof(buff), system_charset_info), *res;
    ulonglong default_value, current_value;
    if (var->type == OPT_GLOBAL)
    {
      default_value= option.def_value;
      current_value= global_var(ulonglong);
    }
    else
    {
      default_value= global_var(ulonglong);
      current_value= session_var(thd, ulonglong);
    }

    if (var->value->result_type() == STRING_RESULT)
    {
      if (!(res=var->value->val_str(&str)))
        return true;
      else
      {
        char *error;
        uint error_len;

        var->save_result.ulonglong_value=
              find_set_from_flags(&typelib,
                                  typelib.count,
                                  current_value,
                                  default_value,
                                  res->ptr(), res->length(),
                                  &error, &error_len);
        if (error)
        {
          ErrConvString err(error, error_len, res->charset());
          my_error(ER_WRONG_VALUE_FOR_VAR, MYF(0), name.str, err.ptr());
          return true;
        }
      }
    }
    else
    {
      longlong tmp=var->value->val_int();
      if ((tmp < 0 && ! var->value->unsigned_flag)
          || (ulonglong)tmp > MAX_SET(typelib.count))
        return true;
      else
        var->save_result.ulonglong_value= tmp;
    }

    return false;
  }
  bool session_update(THD *thd, set_var *var)
  {
    session_var(thd, ulonglong)= var->save_result.ulonglong_value;