A Model of Queries for Object-Oriented Databases
نویسنده
چکیده
One major source of confusion, and consequent c&icisms, about object-oriented databases has been the lack of a comprehensive model of queries. Although there is a reasonable degree of agreement about an object-oriented data model, few operational systems support a query model for object-oriented databases. In this paper, we present a rather comprehensive query model which is consistent with object-oriented concepts embodied in the object-oriented data model. The model takes into account the semantics of the class hierarchy and nested objects, and as such is inherently richer than the relational or nested relational model of queries. A significant subset of the model has been cast into a query language which is supported in the ORION object-oriented database system.
منابع مشابه
Apply Uncertainty in Document-Oriented Database (MongoDB) Using F-XML
As moving to big data world where data is increasing in unstructured way with high velocity, there is a need of data-store to store this bundle amount of data. Traditionally, relational databases are used which are now not compatible to handle this large amount of data, so it is needed to move on to non-relational data-stores. In the current study, we have proposed an extension of the Mongo...
متن کاملApply Uncertainty in Document-Oriented Database (MongoDB) Using F-XML
As moving to big data world where data is increasing in unstructured way with high velocity, there is a need of data-store to store this bundle amount of data. Traditionally, relational databases are used which are now not compatible to handle this large amount of data, so it is needed to move on to non-relational data-stores. In the current study, we have proposed an extension of the Mongo...
متن کاملQuery Interoperation Among Object-Oriented and Relational Databases
We develop an eecient algorithm for the translation of high-order object queries to rst-order relational queries. The translation utilizes a canonical deductive database as a uniform representation of object-oriented schema and data. Object queries are translated to the canonical deductive database in which they are partially evaluated and optimized, before being translated to relational querie...
متن کاملA Method for Protecting Access Pattern in Outsourced Data
Protecting the information access pattern, which means preventing the disclosure of data and structural details of databases, is very important in working with data, especially in the cases of outsourced databases and databases with Internet access. The protection of the information access pattern indicates that mere data confidentiality is not sufficient and the privacy of queries and accesses...
متن کاملExtending the Qualitative Trajectory Calculus Based on the Concept of Accessibility of Moving Objects in the Paths
Qualitative spatial representation and reasoning are among the important capabilities in intelligent geospatial information system development. Although a large contribution to the study of moving objects has been attributed to the quantitative use and analysis of data, such calculations are ineffective when there is little inaccurate data on position and geometry or when explicitly explaining ...
متن کامل