mysql - INSERT 后触发到 INCREMENT

Question

如果行的faction.factionname 与 INSERT 的 cards.faction 匹配，我正在尝试创建一个触发器，在 INSERT into card 之后增加派系表中的 cardcount .

到目前为止，我已经尝试了几种不同的方法，但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 values(11,'x') x 是派系，如果一行派系有 factionname=x触发器应该将该行的“cardcount”增加 1

Answer 1

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 ;