Conference Proceeding Article
Wrappers export the schema and data of existing heterogeneous databases and support queries on them. In the context of cooperative information systems, we present a flexible approach to specify the derivation of object-oriented (OO) export databases from local relational databases. Our export database derivation consists of a set of extent derivation structures (EDS) which defines the extent and deep extent of export classes. Having well-defined semantics, the EDS can be readily used in transforming wrapper queries to local queries. Based on the EDS, we developed a wrapper query evaluation strategy which handles OO queries on the export databases. The strategy is unique in that it considers the limited query processing capabilities of local database systems as well as the language constraints on the local query languages.
Relational database systems, Object oriented programming, Information technology, Query languages, Data structures, Computational linguistics, Constraint theory, Export databases, Extent derivation structures, Legacy data, Interoperable databases
Databases and Information Systems | Numerical Analysis and Scientific Computing
Data Management and Analytics
Cooperative databases and applications: Proceedings of the International Symposium on Cooperative Database Systems for Advanced Applications, Kyoto, Japan, December 5-7, 1996
City or Country
LIM, Ee Peng and LEE, Hon-Kuan.
Export Database Derivation Approach for Supporting Object-oriented Wrapper Queries. (1996). Cooperative databases and applications: Proceedings of the International Symposium on Cooperative Database Systems for Advanced Applications, Kyoto, Japan, December 5-7, 1996. 337-346. Research Collection School Of Information Systems.
Available at: http://ink.library.smu.edu.sg/sis_research/1024
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