Abstract
We discuss the important database theme of Data Independence and how object oriented database applications are failing to perceive its benefits, and instead put too much reliance on encapsulation. The P/FDM object-oriented database is based on the functional data model and has a modular design based on data independence, which allows alternative kinds of object storage to be used. In this work, a relational database management system has been used to provide object storage, and we describe how the data access routines have been implemented. The principal query language used with P/FDM is Daplex, which is normally translated to Prolog, including calls to the basic data access routines. The query is optimised to minimise the expected number of calls. This gives very general method execution and pattern matching search. However, much better performance can be achieved for simpler data-intensive Daplex queries against a relational storage module by translating these to a single SQL statement, which is possible because of data independence.
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Gray, P.M.D., Kemp, G.J.L. (1995). Object-Oriented Systems and Data Independence. In: Patel, D., Sun, Y., Patel, S. (eds) OOIS’94. Springer, London. https://doi.org/10.1007/978-1-4471-3016-1_1
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DOI: https://doi.org/10.1007/978-1-4471-3016-1_1
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