Export database derivation in object-oriented wrappers |
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| Affiliation: | 1. School of Accountancy, Singapore Management University, Singapore;2. Department of Accountancy, College of Business, City University of Hong Kong, Hong Kong Special Administrative Region;3. College of Business, Sun Yat Sen University, Guangzhou, China;1. The Corporate Executive Board, Singapore;2. Singapore Management University, Singapore;1. Department of Information Systems, W.P. Carey School of Business, Arizona State University, United States;2. Department of Mathematics and Statistics, Hang Seng Management College, Hong Kong, China;3. School of Information Systems, Singapore Management University, Singapore |
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| Abstract: | 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. |
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