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101.
本文介绍一种面向对象的数据模型,这个模型CORE模型为基础,给出LOGICWORKS公司的ERwin采用的ER图模型,接着着重讨论一种面向对象数据模型到ER图模型的转换算法。 相似文献
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ODM is a new data model thatintegrates the features of object oriented programming languages (e.g. Smalltalk-80) and Relational Data Model (RDM). It extends the
data structures and operations of RDM and also provides the features of object oriented programming such as improved semantics,
data abstraction, reusability of data structures and codes, and extensibility.
We have introduced the concept of ‘u-set’ (uniform set) as an extension of relation of RDM. We employ messages to define an extension of RDM attributes and tuples.
Definition of classes for databases, u-sets, and tuples allows us to define new (or modify existing) operations for the databases,
u-sets, or tuples. Each database and its elements are u-sets. 相似文献
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Rajendra K. Raj Ewan Tempero Henry M. Levy Andrew P. Black Norman C. Hutchinson Eric Jul 《Software》1991,21(1):91-118
Emerald is a general-purpose language with aspects of traditional object-oriented languages, such as Smalltalk, and abstract data type languages, such as Modula-2 and Ada. It is strongly typed with a non-traditional object model and type system that emphasize abstract types, allow separation of typing and implementation, and provide the flexibility of polymorphism and subtyping with compile-time checking. This paper describes the Emerald language and its programming methodology. We give examples that demonstrate Emerald's features, and compare and contrast the Emerald approach to programming with the approaches used in other similar languages. 相似文献
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Keith E. Gorlen 《Software》1987,17(12):899-922
The Object-Oriented Program Support (OOPS) class library is a portable collection of classes similar to those of Smalltalk-80 that has been developed using the C++ programming language under the UNIX operating system. The OOPS library includes generally useful data types, such as String, Date and Time, and most of the Smalltalk-80 collection classes such as OrderedCtn (indexed arrays), LinkedList (singly linked lists), Set (hash tables), and Dictionary (associative arrays). Arbitrarily complex data structures comprised of OOPS and user-defined objects can be stored on disk files or moved between UNIX processes by means of an object I/O facility. The classes Process, Scheduler, Semaphore and SharedQueue provide multiprogramming with coroutines. This paper gives a brief introduction to object-oriented programming and how it is supported by the C+ + programming language. An overview of the OOPS library is also presented, followed by a programming example. The implementation details of two of the class library's more interesting features, object I/O and processes, are described. The paper concludes with a discussion of the differences between the OOPS library and Smalltalk-80 and some observations based on our programming experience with C++ and OOPS. 相似文献
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以博山石刻艺术园设计为例.分析设计思维在对传统的“继承与创新”命题下思考与蜕变的过程,以及建筑形象塑造的尝试,探讨设计思想摆脱传统风格与形式的束缚,以环境为主题,从环境中具有生命力的要素中寻求启发,进行建筑创作的问题。 相似文献
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