A Declarative Concept-Based Query Language as a mean for Relational Database Querying

Abstract. The aim of the paper is to present a tool executing queries of a de-clarative concept-based query language over a relational database. As the con-cept-based query language the Semantically Complete Query Language (SCQL) is taken because of its property to be used without referencing to proper relation names. The tool is an additional program layer over a RDBMS of any vendor. The layer takes a conceptual query, maps it to SQL query, exe-cutes the SQL query using JDBC, and returns back the result. The tool is con-trolled by XML-based knowledge base that defines: named SCQL queries, a SCM model, and rules of mapping of the model to relational model. The tool is the part of a data integration system based on Semantically Complete Model (SCM).