【摘要】 本文介绍一个采用APPLEⅡPASCAL的简化CODASYL型数据库管理系统。该系统向用户提供的全部功能是一个模式处理程序和一组相当于DML的数据库操作过程。用户可以利用模式处理程序生成一个特定于模式的内部程序单元,供用户书写任何PASCAL程序调用。本文扼要地介绍了该系统的主要特性和功能,较祥细地讨论了若干实现方法问题。更多还原

【Abstract】 A simple CODASYL-like DBMS using APPLE II PASCAL is presented.The system consists of a dbm skelet on,a set of data manipulating procedures,and a schema processor by which the dbm skeleton and the procedures are combined with a given schema producing an intrinsical dbm unit that can be invoked by any user’s PASCAL program.In this paper,the main features and functions of the system are briefly introduced,the implementation methods are fully discussed.更多还原