mysql合并两个触发器

Question

我正在尝试使该触发器适用于表中的两列，有人可以帮我吗？ MariaDB每个表仅支持一个触发器。

begin
    if (select count(*) from reservation where res_room = new.res_room) > 3 then
        signal sqlstate '45000';
    END if;
END

---

这是我的合并尝试：

begin
    if (select count(*) from reservation where res_room = new.res_room) > 3 then
        signal sqlstate '45000';
    if (select count(*) from reservation where res_time = new.res_time) > 8 then
        signal sqlstate '45000';
    END if;
END

---

Answer 1

我认为您想要的语法是：

BEGIN
    if (select count(*) from reservation where res_room = new.res_room) > 3 then
        signal sqlstate '45000';
    elseif (select count(*) from reservation where res_time = new.res_time) > 8 then
        signal sqlstate '45000';
    END if;
END

即，您想要elseif。