delimiter //
CREATE TRIGGER `range` BEFORE INSERT ON touristCompany.hotels
FOR EACH ROW 
    BEGIN
        IF NEW.star >5 THEN
            SET NEW.star = 5;
        ELSEIF NEW.star < 1 THEN
            SET NEW.star = 1;
        END IF;

    END;//
delimiter ;

解决方法:

您需要在发生插入操作的同一模式/数据库中创建触发器.从触发器定义来看,触发操作显然是在touristCompany数据库下.确保在同一数据库下创建触发器.

修改您的触发器定义,如下所示

delimiter //
CREATE TRIGGER `touristCompany`.`range` 
BEFORE INSERT ON `touristCompany`.`hotels`
FOR EACH ROW 
    BEGIN
        IF NEW.star > 5 THEN
            SET NEW.star = 5;
        ELSEIF NEW.star < 1 THEN
            SET NEW.star = 1;
        END IF;

    END;//
delimiter ;

(或)在创建触发器之前选择数据库

USE `touristCompany`;

delimiter //
CREATE TRIGGER `range` ...
<rest of code here>