Data Modeling Design

Data Types and Persistence by Malcolm P. Atkinson, Peter Buneman, Ronald Morrison

By Malcolm P. Atkinson, Peter Buneman, Ronald Morrison

There is a longtime curiosity in integrating databases and programming languages. This e-book on information forms and patience advanced from the court cases of a workshop held on the Appin in August 1985. the aim of the Appin workshop used to be to target those facets: patience and knowledge kinds, and to assemble humans from a variety of disciplines who've considered those difficulties. specific themes of"interest contain the layout of kind platforms acceptable for database paintings, the illustration of power gadgets resembling facts varieties and modules, and the supply of orthogonal patience and likely points of transactions and concurrency. The programme was once damaged into 3 periods: morning, overdue afternoon and night to permit the members to use appealing days within the Scottish Highlands. The monetary suggestions of the technological know-how and Engineering learn Council, the nationwide technological know-how starting place and foreign desktops Ltd. is gratefully stated. we'd additionally wish to thank Isabel Graham, Anne Donnelly and Estelle Taylor for his or her assist in setting up the workshop. eventually our because of Pete Bailey, Ray Carick and Dave Munro for the large activity they undertook in typesetting the publication. The convergence of programming languages and databases to a coherent and constant entire calls for rules from, and adjustment in, either highbrow camps. the 1st workforce of chapters during this e-book current principles and changes coming from the programming language learn group. This group usually discusses varieties and makes use of them as a framework for different discussions.

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Separately-compiled program units and program libraries are naturally viewed as persistent (pure) functors. Since a functor is an object, object persistence provides the means of supporting separately compiled program units and program libraries. But since functors have no nonlocal references to the heap, they may be isolated from the rest of the heap, much as we isolated structure hierarchies above. As a result, a simpler implementation strategy is 29 available for the support of persistent functors based on the import and export primitives defined above.

Whether or not full persistence is necessary for our purposes remains unclear, though it appears that the real advantages of persistence lie in the context of database programming. ACKNOWLEDGEMENTS Kevin Mitchell and Dave MacQueen carefully read a draft of this paper and made many valuable suggestions. REFERENCES [ACC81] [AG085] [AM85b] [CM85] [HARP86] [MACQ85] [MATI85B] [MILN85] Chapter 3 Persistence and Type Abstraction Luca Cardelli AT&T Bell Laboratories David MacQueen AT&T Bell Laboratories ABSTRACT Abstract types are a familiar and effective way of structuring programs.

Here t is a bound type variable, and v is a bound variable pattern of type cr(t). For example, we can use the point package to generate the point (2,3) in the following way: open Point as t, In f(p,2,3) Here t is not used, but in general it could appear in function definitions in the body of open. The treatment of the binding of t will differ according to the model of abstraction we adopt, as explained in the next section. 2. PACKAGES AND ABSTRACTION There are several alternative ways of treating the type component of a package, and these alternative treatments lead to different styles of type abstraction [MACQ86].

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