php - TRIGGER CREATED 成功，但 information_schema TRIGGERS 表中没有触发器

Question

您好，我正在尝试使用触发器，我的 MySQL 版本是 5.5.8

事情是当我创建触发器时，PHPMyadmin 说它已成功创建，

这是我的触发器

DELIMITER $$
CREATE TRIGGER `check_pupil_before_insert` BEFORE INSERT ON `pupil_data`
FOR EACH ROW  BEGIN
  IF  CHAR_LENGTH( NEW.DateOfBirth ) < 4 THEN
       SIGNAL SQLSTATE '12345'
        SET MESSAGE_TEXT := 'check constraint on pupil_data.DateOfBirth  failed';
    END IF;
END$$  
DELIMITER ;

它说

Your SQL query has been executed successfully
DELIMITER $$ CREATE TRIGGER `check_pupil_before_insert` BEFORE INSERT ON  `pupil_data` 
FOR EACH
ROW BEGIN 
IF CHAR_LENGTH( NEW.DateOfBirth ) <4
THEN SIGNAL SQLSTATE '12345'
SET MESSAGE_TEXT :=  'check constraint on pupil_data.DateOfBirth  failed';

END IF ;

但是当我

select * from information_schema.triggers

MySQL returned an empty result set (i.e. zero rows). ( Query took 0.0843 sec )
SELECT * 
FROM information_schema.triggers
LIMIT 0 , 30

为什么会这样，请帮助我，在此先感谢。

Answer 1

检查这个..它会帮助你......并确保查询与图像中显示的相同，将“:=”更改为“=”