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                `Lock`方法是用于數據庫的鎖機制,如果在查詢或者執行操作的時候使用: ~~~ Db::name('user')->where('id',1)->lock(true)->find(); ~~~ 就會自動在生成的SQL語句最后加上 `FOR UPDATE`或者`FOR UPDATE NOWAIT`(Oracle數據庫)。 lock方法支持傳入字符串用于一些特殊的鎖定要求,例如: ~~~ Db::name('user')->where('id',1)->lock('lock in share mode')->find(); ~~~
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