SIEMENS数控系统为满足数控加工中心高速、高效、高精度加工零件的要求，提供了一系列特有的指令功能， 其程序结构有独特的要求。使用UG软件的数控编程人员往往只需关心加工刀轨，把生成程序代码的任务交给后置处理来完 成。为满足数控编程人员的需求，就需要使用TCL语言制作后置处理。本文结合SIEMENS系统指令特点，简要介绍TCL语 言替换命令、流程控制命令在SIEMENS系统后置处理制作中的应用。

With the continuous development of information technology, the era of big data has come. There is more and more unstructured data. The society urgently needs new type of database personnel. The traditional teaching system of database application course cannot meet the needs of talent training in the new era, so it needs to be reformed and optimized. This paper mainly analyzes the reform of the teaching system of database application course in big data time.