Question

我在创建MySQL（5.1）触发器时遇到了麻烦，我真的没有看到我在这里做错了什么。这是代码：

DELIMITER //
CREATE TRIGGER CheckSoftware BEFORE INSERT ON Software
FOR EACH ROW BEGIN
    -- Uppercase the first letter
    SET NEW.name = CONCAT(UPPER(SUBSTRING(NEW.name, 1, 1)), SUBSTRING(NEW.name, 2));

    -- If price isn't round
    IF NEW.price != TRUNCATE(NEW.price) THEN
        IF NEW.price - TRUNCATE(NEW.price) <= 0.49 THEN
            -- Sets it to xx.49
            SET NEW.price = TRUNCATE(NEW.price) + 0.49;
        ELSIF (NEW.price - TRUNCATE(NEW.price)) <= 0.99 THEN
            -- Sets it to xx.99
            SET NEW.price = TRUNCATE(NEW.price) + 0.99;
        END IF;
    END IF;
END;
//
DELIMITER ;

以及MySQL在我脸上抛出的东西：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') THEN
        IF NEW.price - TRUNCATE(NEW.price) <= 0.49 THEN    
    ' at line 7

非常感谢您的关注！

Answer 1

DELIMITER //
    CREATE TRIGGER CheckSoftware BEFORE INSERT ON Software
    FOR EACH ROW BEGIN
        -- Uppercase the first letter
        SET NEW.name = CONCAT(UPPER(SUBSTRING(NEW.name, 1, 1)), SUBSTRING(NEW.name, 2));

        -- If price isn't round
        IF NEW.price != TRUNCATE(NEW.price,2) THEN
            IF NEW.price - TRUNCATE(NEW.price,2) <= 0.49 THEN
                -- Sets it to xx.49
                SET NEW.price = TRUNCATE(NEW.price,2) + 0.49;
            ELSIF (NEW.price - TRUNCATE(NEW.price,2)) <= 0.99 THEN
                -- Sets it to xx.99
                SET NEW.price = TRUNCATE(NEW.price,2) + 0.99;
            END IF;
        END IF;
    END;
    //

DELIMITER ;

截断函数使用两个参数！

Answer 2

DELIMITER # 

CREATE TRIGGER CheckSoftware BEFORE INSERT ON Software
FOR EACH ROW BEGIN
    SET NEW.name = CONCAT(UPPER(SUBSTRING(NEW.name, 1, 1)), SUBSTRING(NEW.name, 2));
    IF NEW.price != TRUNCATE(NEW.price) THEN
      ...
    END IF;
END # -- end of create trigger

DELIMITER ;

编辑 - 差异：

...
END; <----
# -- end of create trigger


DELIMITER ;

触发器中的语法错误

2 个答案: