Abstract

Object-oriented (OO) databases have happened important for both research and development area in the past decade. On the other hand, databases of this type have been found too expansive and not too functional in a planty of practical tasks. New architectures appeared: object-relational data managers, relational wrapper libraries, and OO databases. The attractiveness of these solutions is that enable OO applications to be written against today's enterprise data both file- and relation-oriented. Moreover, they make OO design methodologies available for implementing business objects. Our solution of persistence of C++object includes possibilities: to handle persistent objects via C++ prgrams, to conceive rows of relations as C++ objects, to use high-level query facilities in C++ programs, and to use many of database-oriented features on the level of C++ programming. The article is focused on some implementation techniques used in the GEN.LIB - a library managing a persistence through relations stored in a commercial RDBMS. The results are a part of the COPERNICUS project ADOORE.

Highlights

  • Object-oriented databases have happened important for both research and development area in the past decade

  • Two significant development lines are recently at disposal: ODMG-93 standard Release 1.2 with its language OQL [Ca96] and the work proposed by the ANSI X3H2 group well-known as SQL3 that stores objects in special kinds of columns in relations

  • GEN.LIB is a library managing a persistency of application domain objects using a relational database server

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Summary

Introduction

Object-oriented databases have happened important for both research and development area in the past decade. The GEN.LIB part of the projects provides a support for persistence of C++ application objects and some possibilities to use relational tuples as objects in C++ programs. GEN.LIB is a library managing a persistency of application domain objects using a relational database server. GEN.LIB is, in general, a part of the client application, which provides an interface between two different paradigms: an object oriented environment on side of the client, and a relational database server on the other side. GEN.LIB is a library of components that provides transparent storage/retrieval services of the objects written in the target programming language (C++) in the relational database(s). We will discuss some features of the GEN.LIB more deeply

Database independence
Persistent Object Prototypes
Referencing of the Persistent Objects
Querying Objects
Relationships Between Objects
Maintaining Polymorphic Collections
Conclusions

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