create procedure updateAP()
    READS SQL DATA
    DETERMINISTIC
begin
    declare v_id int;
    declare v_parent_id int;
    declare v_type varchar(50);
    declare v_tree_id int;
    declare v_pos int;
    declare v_temp_data varchar(100);
    declare v_data varchar(100);

    DECLARE cur CURSOR FOR SELECT something from sometable;

    DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = 1;

    OPEN cur;

    WHILE done = 0 DO

            FETCH cur INTO v_id, v_parent_id,  v_tree_id,  v_type, v_pos, v_data;

        IF NOT done THEN
            IF v_type = 'month_period' THEN
                set v_temp_data = set_cost_date(v_data, '01.11.2022');
            elseif v_type = 'month_cost' THEN
               set v_temp_data = set_cost(v_data);
            end if;

            insert mtree_node(parent_node, mtree_id, type, data, pos)
            values(last_insert_id(), v_tree_id, v_type, v_temp_data, v_pos);

        END IF;

    END WHILE;

    CLOSE cur;
end;

[HY000][1193] Unknown system variable 'done'