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    MiniOB 1
    
   MiniOB is one mini database, helping developers to learn how database works. 
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成员的完整列表,这些成员属于 ThreadHandler,包括所有继承而来的类成员
| await_stop()=0 | ThreadHandler | pure virtual | 
| close_connection(Communicator *communicator)=0 | ThreadHandler | pure virtual | 
| create(const char *name) | ThreadHandler | static | 
| new_connection(Communicator *communicator)=0 | ThreadHandler | pure virtual | 
| start()=0 | ThreadHandler | pure virtual | 
| stop()=0 | ThreadHandler | pure virtual | 
| ThreadHandler()=default (定义于 ThreadHandler) | ThreadHandler | |
| ~ThreadHandler()=default (定义于 ThreadHandler) | ThreadHandler | virtual |