我正在尝试创建一个触发器,如果行的faction.factionname
与INSERT的cards.faction
匹配,则在将INSERT插入卡后增加派生表中的卡数。
到目前为止,我已经尝试了几种不同的方法,但是下面的代码是我最接近的猜测
create table cards(
cardid int not null,
faction varchar(255) not null,
primary key(cardid)
);
create table faction(
factionname varchar(255) not null,
cardcount int not null,
primary key(factionname)
);
create trigger updatecountinsert
after insert on cards
for each row
begin
update faction
set cardcount=carcount+1
where last_insert_id().faction=faction.factionname
end;
基本上,如果我插入的值(11,'x')x是该派系,如果一行的派系具有factionname = x
触发应该
该行的“卡数”增加1
最佳答案
DELIMITER $$
CREATE TRIGGER updatecountinsert
AFTER INSERT ON cards
FOR EACH ROW
BEGIN
-- NEW is used to qualify references values of the row that was just inserted
-- e.g. NEW.faction is a reference to the value in the faction column
UPDATE faction f
SET f.cardcount = f.cardcount + 1
WHERE f.factionname = NEW.faction ;
END;
$$
DELIMITER ;
关于mysql - 插入后触发到INCREMENT,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/55403894/