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Methods and apparatus for querying a relational data store using schema-less queries

  • US 10,275,540 B2
  • Filed: 12/01/2016
  • Issued: 04/30/2019
  • Est. Priority Date: 05/15/2001
  • Status: Expired due to Term
First Claim
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1. A method to extract data in a data store, the method comprising:

  • executing by a processor of the computer system that transforms the computer system into a machine;

    receiving a first query specifying one or more resource description framework (RDF) triples to be identified in the data store and having a first storage schema, where the first query reflects either a schema-less storage of the RDF triples or reflects any of a second storage schema of the RDF triples, and the second storage schema differs from the first storage schema;

    extracting data, represented by one or more tokens in the first query and included within context-specific grammar events represented by the one or more tokens, from the context-specific grammar events to generate a second query that specifies the one or more RDF triples to be identified in the data store, is responsive to the first query, and reflects the first storage schema, wherein the events represent any of a declaration and a constraint specified in the first query;

    where the second query comprisesa single SQL SELECT statement with a WHERE clause containing three or more logical conditions limiting triples to be considered for retrieval from the RDF triples in the data store, where each logical condition specifies one or more RDF triples according to a Boolean condition;

    applying the single SQL SELECT statement second query to the data store for identification of the one or more specified RDF triples responsive to the first query.

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