Alternative to Dynamic SQL inside trigger?

My database has the following tables:

    TAG    ----------------------    | tag_id | tag_name  |    ----------------------    TAG_VALUE: Stores values associated to each tag    ----------------------------------------    | tag_id | insertion_timestamp | value |    ----------------------------------------    ALARM: Defines alarms for each tag    -------------------------------------    | alarm_id | tag_id | function_name |    -------------------------------------    ALARM ACTIVATION: Stores information regarding each time the alarms were triggered    -----------------------------------------------------    | alarm_id | activation_timestamp | activation_value|    -----------------------------------------------------

So, everytime a new value is inserted into TAG_VALUE, I need to check if that new value triggers any alarm associated to it's tag. Since there is no common criteria between alarms, I'm just storing a function name, which will be used later on to determine if the alarm should be triggered or not

TAG_VALUE has the following AFTER_INSERT trigger:

CREATE DEFINER=`root`@`localhost` TRIGGER `mydb`.`tag_value_AFTER_INSERT` AFTER INSERT ON `tag_value` FOR EACH ROWBEGINcall sp_alarm_handler(NEW.tag_value, NEW.tag_id);END

And sp_alarm_handler is coded as follows:

CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_alarm_handler`(IN tag_value VARCHAR(255), IN value_tag_id INT(11))    BEGIN    DECLARE exit_loop BOOLEAN;    DECLARE v_alarm_id INT(11);    DECLARE function_name VARCHAR(255);    DECLARE value_triggers_alarm TINYINT(1);    DECLARE custom_alarm_cur CURSOR FOR    Select alarm_id, function_name From vw_custom_alarms where tag_id = value_tag_id;    DECLARE CONTINUE HANDLER FOR NOT FOUND SET exit_loop = TRUE;    OPEN custom_alarm_cur;    custom_alarm_lp: LOOP        FETCH custom_alarm_cur into v_alarm_id, function_name;        IF exit_loop THEN        leave custom_alarm_lp;        END IF;        #************************************************        #*********HERE'S THE DYNAMIC SQL PIECE'**********        #************************************************        set @query = CONCAT('Select ',function_name,'(',tag_value,')', 'into @value_triggers_alarm');        PREPARE stmt FROM @query;        Execute stmt;        IF fn_is_alarm_active(v_alarm_id) = 0 THEN            If @value_triggers_alarm = 1 THEN                    INSERT INTO alarm_activation(alarm_id, activation_timestamp, activation_value)                    VALUES (v_alarm_id, NOW(), tag_value);            end if;        ELSE IF @value_triggers_alarm = 0 THEN            call sp_deactivate_alarm(v_alarm_id);            END IF;        END IF;    END LOOP custom_alarm_lp;    Close custom_alarm_cur;    END

This gives me an ERROR 1336: 1336: Dynamic SQL is not allowed in stored function or triggerIs there any workaround in my case?