我想与React（hooks）和Firebase一起创建一个不错的仪表板。但是我想知道为什么在类组件中多次调用CREATE TRIGGER edit_total ON dbo.User
FOR INSERT , UPDATE , DELETE
AS
BEGIN
IF NOT EXISTS(SELECT * FROM INSERTED)
-- DELETE
UPDATE dbo.group SET total = total - 1 FROM inserted WHERE group.grp = inserted.grpe;
ELSE
BEGIN
IF NOT EXISTS(SELECT * FROM DELETED)
-- INSERT
UPDATE dbo.group SET total = total + 1 FROM inserted WHERE group.grp = inserted.grp;
ELSE
-- UPDATE
END
END;
.on或child_added。代码（index.js）：
value由于某种原因，console.log被触发了3次，无法弄清为什么会这样。我在此处实施Firebase还是在React上执行错误？