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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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