Question

我只想在插入触发器之后创建以在历史表中插入新行。为什么运行查询时出错？

订单

create table orders
(
    id int auto_increment
        primary key,
    id_user int not null,
    picture_name varchar(100) not null,
    time date not null,
    constraint FK_USER
        foreign key (id_user) references stef.users (id)
)
;

create index FK_USER_idx
    on orders (id_user)
;

记录

create table history
(
    id int auto_increment
        primary key,
    id_order int not null,
    id_action int not null,
    time date not null,
    constraint FK_ORDER
        foreign key (id_order) references stef.orders (id),
    constraint FK_ACTION
        foreign key (id_action) references stef.actions (id)
)
;

create index FK_ORDER_idx
    on history (id_order)
;

create index FK_ACTION_idx
    on history (id_action)
;

我的触发器......

CREATE TRIGGER orders_AFTER_INSERT
AFTER INSERT ON stef.orders
FOR EACH ROW
  BEGIN
    INSERT INTO history('id_order', 'id_action', 'time')
    VALUES (NEW.id, 1, NOW());
  END;

我只想在插入触发器之后创建以在历史表中插入新行。为什么运行查询时出错？

Answer 1

试试这个

DELIMITER $$
CREATE TRIGGER orders_AFTER_INSERT
AFTER INSERT ON stef.orders
FOR EACH ROW
BEGIN
    INSERT INTO history(`id_order`, `id_action`, `time`)
    VALUES (NEW.id, 1, NOW());
END$$
DELIMITER ;

您需要暂时覆盖分隔符，以便MySQL可以区分触发器（或过程或函数）体内的语句结束与正文结束。

编辑：单引号（'）仅用于表示字符串值，因为字段名称使用`（或在某些配置中使用"）

Answer 2

CREATE TRIGGER orders_AFTER_INSERT
AFTER INSERT ON stef.orders
FOR EACH ROW
BEGIN
    INSERT INTO stef.history()
    VALUES (null, NEW.id, 1, NOW());
END

无法创建触发器

2 个答案: