对于触发器中的每个循环

Question

无法在触发器中使用每个循环 我正在

  

错误代码：1064

DELIMITER $$
CREATE
    TRIGGER `TRG_AU_DEVICES_HOWLONG` AFTER UPDATE ON `devices` 
    FOR EACH ROW BEGIN
     DECLARE lastid INTEGER;
     DECLARE a, b, c VARCHAR(255);
    SET @lastid := (SELECT deviceId FROM devices ORDER BY packetDate DESC LIMIT 1);
    DECLARE cur1 CURSOR FOR SELECT alertType,deviceId FROM alerts WHERE alerts.deviceId = @lastid ;
        OPEN cur1;
        read_loop: LOOP
        FETCH cur1 INTO a, b;
      insert into test(alertType,deviceId) values(a,b);
    END LOOP;
CLOSE cur1;
END;
$$
DELIMITER ;

无法在触发器中使用每个循环，我得到Error Code: 1064。如何在触发器中使用每个循环

Answer 1

DELIMITER $$

CREATE    TRIGGER TRG_TEST更新devices之前     为了每行开始     DECLARE完成INT DEFAULT 0;     DECLARE alert VARCHAR（255）;

DECLARE my_cur CURSOR FOR SELECT alertType FROM alerts WHERE deviceId = 8170610948;    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;          打开my_cur;     my_cur_loop：     LOOP FETCH my_cur INTO a;         如果完成= 1那么             离开my_cur_loop;         万一;         INSERT INTO test（alertType）VALUES（alert）;     END LOOP my_cur_loop; 关闭my_cur;

END; $$