問題描述
我對 Php PDO 函數有點困惑:lastInsertID.如果我理解正確，它會返回插入到數據庫中的最后一個自動增量 ID.
I have little confusion about the Php PDO function: lastInsertID. If I understand correctly, it returns the last auto-incremental id that was inserted in the database.
當我在創建注冊用戶的功能時執行在我的數據庫中插入用戶的查詢時，我通常會使用此函數.
I usually use this function when I execute a query that inserts a user in my database when I am creating the functionality of registering a user.
我的問題是，例如，我有一百個人同時在我的網站上注冊.并且可能是一個用戶在另一個用戶之后一毫秒點擊了注冊"按鈕.那么這個函數lastInsertId是否有可能返回另一個剛剛注冊的用戶的id?
My question is that say I have a hundred people registering on my site at one point for example. And may be one user hit the 'Register' button a millisecond after another user. Then is there a chance that this function lastInsertId will return the id of another user that register just momentarily earlier?
可能是我想問的是服務器是否一次處理一個請求并一次處理一個 php 文件?
May be what I am trying to ask is does the server handle one request at a time and go through a php file one at a time?
請告訴我這件事.
謝謝.
推薦答案
完全安全.沒有競爭條件.它只從進行插入的 pdo 對象返回最后插入的 Id.
Perfectly safe. There is no race condition. It only returns the last inserted Id from the pdo object that made the insert.
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