Schema evolution in OODBs using class versioning

1 September 1993

journal article
Published by Association for Computing Machinery (ACM) in ACM SIGMOD Record

Vol. 22 (3) , 16-22
https://doi.org/10.1145/163090.163094

Abstract

This paper describes work carried out on a model for the versioning of class definitions in an object-oriented database. By defining update and backdate functions on attributes of the previous and current version of a class definition, instances of any version of the class can be converted to instances of any other version. This allows programs written to access an old version of the schema to still use data created in the format of the changed schema.

Keywords

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