Query translation from SQL to XPath
ABSTRACT Today XML is the de facto standard of data exchange format for the information on the Web. At the same time, database systems are well known for consistent storage, retrieval and manipulation of data. XML querying language (XPath) is used to access XML documents whereas Structured Query Language (SQL) for retrieving and manipulating data in relational database. It may not be possible for users and developers to be familiar with both the query languages easily and quickly. Here, we examine how XML data can be queried using SQL. In this paper, we propose a new concept and framework where SQL statements can be easily transformed to XPath expressions. We use SQL, as it has long been the standard language. Users can access XML database and relational database through the query language SQL using our framework. We present algorithms for translating queries expressed in SQL (SELECT, DELETE, RENAME) to XPath. The procedure provides relational interface to XML database and the experimental results validate the proposed approach.
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ABSTRACT: This work describes an architecture for integrating heterogeneous data sources under an XML global schema, following the local-as-view approach (local sources' schemas are described as views over the global schema). In this context, we focus on the problem of translating the user's query against the XML global schema into a SQL query over the local data sources.10/2001;
Article: XQuery: An XML query language[Show abstract] [Hide abstract]
ABSTRACT: The World Wide Web Consortium has convened a working group to design a query language for Extensible Markup Language (XML) data sources. This new query language, called XQuery, is still evolving and has been described in a series of drafts published by the working group. XQuery is a functional language comprised of several kinds of expressions that can be nested and composed with full generality. It is based on the type system of XML Schema and is designed to be compatible with other XML-related standards. This paper explains the need for an XML query language, provides a tutorial overview of XQuery, and includes several examples of its use.Ibm Systems Journal 02/2002; · 1.29 Impact Factor
Conference Paper: SQL to XQuery Translation in the AquaLogic Data Services Platform[Show abstract] [Hide abstract]
ABSTRACT: SQL has long been the standard language for retrieving and manipulating data in relational database systems. XML has become the standard format for data exchange, and XQuery is on its way to becoming the standard language for querying XML data. The BEA AquaLogic Data Services Platform provides a service-oriented, XML-based view of heterogeneous enterprise data sources and allows this view to be queried using XQuery. AquaLogic DSP includes a JDBC driver that connects the old (SQL) world with the new (XML) world via a SQL-to-XQuery translator. This paper outlines the issues related to creating such a driver and details the approach used to translate SQL queries into XQuery expressions. The paper also touches on performance considerations related to handling XML query results in a context where JDBC result sets are the desired output format.Data Engineering, 2006. ICDE '06. Proceedings of the 22nd International Conference on; 05/2006