方法可能未关闭数据库资源，未关闭数据库资源将会导致性能变差，还可能引起应用与服务器间的通讯问题。
Failure to close database resources on all paths out of a method may result in poor performance, and could cause the application to have problems communicating with the database.
采用多媒体定时器以及多线程技术，实现高速下数据在串口系统中的传输以及多串口数据通讯问题。
The multimedia timer and multithread technique were used to solve the high speed data transmission in serial port system and data communication in multi-serial port system.
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