引发错误在 MySQL 触发器中不起作用

Question

如果一个人的姓氏不是全大写或者他们名字的第一个字母不是大写，我试图在我的触发器中引发错误。但如果满足这些情况，我的代码似乎不会发出警报。有人可以向我解释一下我该怎么做吗？

这是我的table:

DROP TABLE IF EXISTS people;
CREATE TABLE IF NOT EXISTS people (
Id_People smallint(5) unsigned NOT NULL AUTO_INCREMENT,
Firstname varchar(20) NOT NULL,
Lastname varchar(20) NOT NULL,
Birth     DATE,
PRIMARY KEY (Id_People)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1002 ;DROP TRIGGER IF EXISTS insert_people;

这是我的触发器

DROP TRIGGER IF EXISTS insert_people;
DELIMITER $$
CREATE TRIGGER insert_people BEFORE INSERT ON people
FOR EACH ROW BEGIN 
    IF NOT  (NEW.Lastname like UCASE ) THEN 
          SIGNAL SQLSTATE '45000'
            SET MESSAGE_TEXT = 'the lastname must be in full caps ';
           
    ELSE IF
         NOT (NEW.Firstname like ucfirst ) THEN
           SIGNAL SQLSTATE '45000'
            SET MESSAGE_TEXT = 'the first letter of the firstname must be in caps'; 
    
     END IF; 
  END IF;
 
END$$

Answer 1

你找到那些的代码不正确。

请将 DELIMITER 添加到触发代码，因为在示例站点中不需要

DROP TABLE IF EXISTS people;
CREATE TABLE IF NOT EXISTS people (
Id_People smallint(5) unsigned NOT NULL AUTO_INCREMENT,
Firstname varchar(20) NOT NULL,
Lastname varchar(20) NOT NULL,
Birth     DATE,
PRIMARY KEY (Id_People)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1002 ;DROP TRIGGER IF EXISTS insert_people;

CREATE TRIGGER insert_people BEFORE INSERT ON people
FOR EACH ROW BEGIN 
    IF NOT  (NEW.Lastname=BINARY UPPER(NEW.Lastname)) THEN 
          SIGNAL SQLSTATE '45000'
            SET MESSAGE_TEXT = 'the lastname must be in full caps ';
           
    ELSE IF
         NOT (ASCII(NEW.Firstname) BETWEEN 65 AND 90 ) THEN
           SIGNAL SQLSTATE '45000'
            SET MESSAGE_TEXT = 'the first letter of the firstname must be in caps'; 
    
     END IF; 
  END IF;
 
END

INSERT INTO people VALUES (NULL,'Hallo','Kitty','1980-01-01')

the lastname must be in full caps

INSERT INTO people VALUES (NULL,'hallo','KITTY','1980-01-01')

the first letter of the firstname must be in caps

db<>fiddle here

引发错误在 MySQL 触发器中不起作用

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