Database-independent mechanism for retrieving relational data as XML
First Claim
1. A computer-implemented method comprising:
- receiving, by a processor, an XQuery query from a Java application via an XQuery API for Java (XQJ), the Java application attempting to access a relational data source having a relational data model;
generating, by the processor, XML results responsive to the XQuery query and based on data from the relational data source by;
dividing the XQuery query into one or more XQuery expressions;
determining for the one or more XQuery expressions whether an XML data source or the relational data source is being queried, the one or more XQuery expressions including a first XQuery expression querying the relational data source;
determining that the first XQuery expression cannot be translated into one or more relational queries for the relational data source and equivalent to the first XQuery expression;
retrieving, by an XQuery engine having a first data model incompatible with the relational data model, the relational data from the relational data source; and
executing, in the XQuery engine, the first XQuery expression using the retrieved relational data to generate, at least in part, the XML results responsive to the XQuery query and based on the relational data retrieved from the relational data source, the XML results responsive to the XQuery query and based on data from the relational data source generated without one or more relational queries equivalent to the first XQuery expression; and
sending the XML results to the Java application via the XQJ.
6 Assignments
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Accused Products
Abstract
Techniques are disclosed for retrieving both data stored in relational form and data stored in XML form responsive to a single XQuery query. The techniques allow applications to retrieve relational data residing in various relational database management systems by using XQuery and XQuery for Java. In one such embodiment, an embeddable serverless computer component implements the techniques, and includes a combination of one or more relational adaptors and a mediator to access relational data and transform it into appropriate XML. The techniques are embeddable, and can be standards-based, database-independent, and operating-system independent. Optimized performance and scalability from desktop to enterprise applications are enabled as the number of users and/or database size increases.
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Citations
20 Claims
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1. A computer-implemented method comprising:
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receiving, by a processor, an XQuery query from a Java application via an XQuery API for Java (XQJ), the Java application attempting to access a relational data source having a relational data model; generating, by the processor, XML results responsive to the XQuery query and based on data from the relational data source by; dividing the XQuery query into one or more XQuery expressions; determining for the one or more XQuery expressions whether an XML data source or the relational data source is being queried, the one or more XQuery expressions including a first XQuery expression querying the relational data source; determining that the first XQuery expression cannot be translated into one or more relational queries for the relational data source and equivalent to the first XQuery expression; retrieving, by an XQuery engine having a first data model incompatible with the relational data model, the relational data from the relational data source; and executing, in the XQuery engine, the first XQuery expression using the retrieved relational data to generate, at least in part, the XML results responsive to the XQuery query and based on the relational data retrieved from the relational data source, the XML results responsive to the XQuery query and based on data from the relational data source generated without one or more relational queries equivalent to the first XQuery expression; and sending the XML results to the Java application via the XQJ. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory machine-readable storage medium having machine-executable instructions, that when executed by a processor, cause the processor to carry out a process comprising:
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receiving an XQuery query from a Java application via an XQuery API for Java (XQJ), the Java application attempting to access a relational data source having a relational data model; generating XML results responsive to the XQuery query and based on data from the relational data source by; dividing the XQuery query into one or more XQuery expressions; determining for the one or more XQuery expressions whether an XML data source or the relational data source is being queried, the one or more XQuery expressions including a first XQuery expression querying the relational data source; determining that the first XQuery expression cannot be translated into one or more relational queries for the relational data source, and equivalent to the first XQuery expression; retrieving, by an XQuery engine having a first data model incompatible with the relational data model, the relational data from the relational data source; and executing, in the XQuery engine, the first XQuery expression using the retrieved relational data to generate, at least in part, the XML, results responsive to the XQuery query and based on the relational data retrieved from the relational data source, the XML results responsive to the XQuery query and based on data from the relational data source generated without one or more relational queries equivalent to the first XQuery expression; and sending the XML results to the Java application via the XQJ. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A system comprising:
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a processor; and a machine-readable storage medium having machine-executable instructions, that when executed by the processor, cause the processor to carry out a process for transforming between the relational data and the XML data, the process including; receiving an XQuery query from an application attempting to access a relational data source having a relational data model; and an XQuery engine, the XQuery engine having a first data model incompatible with the relational data model, for generating XML results responsive to the XQuery query and based on data from the relational data source by; dividing the XQuery query into one or more XQuery expressions; retrieving the relational data from the relational data source; executing a first XQuery expression using the retrieved relational data to generate, at least in part, the XML results responsive to the XQuery query and based on the relational data retrieved from the relational data source, the XML results generated without one or more relational queries equivalent to the first XQuery expression; and sending the XML results to the application via the XQuery interface; and wherein the XQuery engine includes a mediator module for determining for the one or more XQuery expressions whether an XML data source or the relational data source is being queried, the one or more XQuery expressions including the first XQuery expression querying the relational data source and determining that the first XQuery expression cannot be translated into one or more relational queries for the relational data source and equivalent to the first XQuery expression. - View Dependent Claims (19, 20)
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Specification