我有兩個具有1-n關係的類。像這樣: class Band
include Mongoid::Document
has_many :members
end
class Member
include Mongoid::Document
field :name, type: String
field :joined, type: Date
給定COM接口的名稱作爲字符串,我如何獲得相應的IID,以便我可以調用QueryInterface()? 例如: // Attempt to cast IDispatch referenced by pDisp to an ICommandBarButton
char *interface_name = "ICommandBarButton";
IID iid;
<<< code to
我想通過Rails查詢界面運行下面的查詢,但無法翻譯我的邏輯。查詢是 Select f.* from feeds f
Left join feed_items fi on fi.id = f.feedable_id
where
f.feedable_type in ('Homework', 'Datesheet')
and
(
(fi.assignable
我在我的Rails應用程序,哪些SQL我想要的模糊搜索是這樣的: select * from `user` where name like '%abc%'
我一直試圖做這樣的: name = 'abc'
User.where("name like '%?%'", name)
它失敗了,在控制檯登錄它: select * from `user` where name like '%'abc