Items属性未被缓存，因此总是从数据库中反复不断地请求所有数据项。
The Items property is not cached and therefore always requests all items from the database over and over again. Here is how the first loop iterations look
如果只是因为数据库允许您请求，就不断地为一个已经预订的房间保存新的预订请求，那没有比这更令人沮丧的了！
Nothing would be more frustrating than to have to repeatedly save new reservation requests for an already-reserved room just because the database lets you request it anyway!
持续不断地将你的请求交给你的潜意识来解决，总会守得云开见月明。
Keep on turning your request over to your subconscious until the day breaks and the shadows flee away.
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