Unified Class Evolution by Object-Oriented Views
نویسنده
چکیده
Object-oriented databases are said to support evolution and incremental development. On the schema level, a rm restriction in this evolution is that it can only be done by evolving class hierarchies downwards by subclassing. We show a uni ed approach to class evolution in object-oriented databases, where class hierarchies are allowed to grow in all directions, covering for evolution situations like generalisation, specialisation, and class versioning. We show how to make the evolution transparent, allowing existing and new clients to coexist and be clients of the same (existing and new) objects. A design of this approach based on object-oriented database views is shown.
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