v PERSISTENT PROGRAMMING: A PROGRAMMING LANGUAGE AND DATABASE INTEGRATION TECHNOLOGY R Morrison Rapporteur: Robert Allen and Dr Robert Stroud V.2 V. 3 PERSISTENT PROGRAMMING: A PROGRAMMING LANGUAGE AND DATABASE INTEGRATION TECHNOLOGY R Morrison, R C H Connor, Q I Cutts, G N C Kirby & D Munro School of Mathematical and Computational Sciences, University of St Andrews, North Haugh, St Andrews KY16 9SS, Scotland
[email protected] M P Atkinson Department of Computer Science, University of Glasgow, Glasgow G 12 8QQ, Scotland
[email protected] ABSTRACT Persistent programming is concerned with creating and manipulating data in a manner that is independent of its lifetime. The persistence abstraction yields a number of advantages in terms of orthogonal design and programmer productivity. One major advantage is that the abstraction integrates the database view of information with the programming language view. For this reason persistent programming languages are sometimes called database programming languages. A number of design principles have been devised for persistent systems. Following these rules, languages may provide persistence as a basic abstraction. In this paper the motivation for persistence is reviewed along with the above mentioned design rules for orthogonal persistence. Three examples of the integration of programming languages and databases through the persistence abstraction are given along with a discussion of their benefits. The examples are linguistic reflection, concurrency control and a new technology only available in persistent systems, called hyper-programming. 1 Introduction The aim of persistent programming is to support the activity of applications construction. Currently the technology underlying applications building relies on a number of disparate mechanisms and philosophical assumptions for support and efficient implementation.