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Full-Text index producing device for producing a full-text index and full-text data base retrieving device having the full-text index

  • US 5,940,836 A
  • Filed: 04/21/1997
  • Issued: 08/17/1999
  • Est. Priority Date: 04/19/1996
  • Status: Expired due to Fees
First Claim
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1. A full-text data base retrieving device for retrieving a data base on the basis of a query, said full-text data base retrieving device comprising:

  • a full-text index having character location information representative of location of each of key character sequences of N characters that appear in said data base, where N is a positive integer, said character location information being produced in accordance with the sorts of said key character sequences and classified contexts which have classification numbers and each of which has any one of said key character sequences;

    query memory means for memorizing an inputted query as a retrieval key character sequence;

    separating means for separating said retrieval key character sequence into a plurality of retrieval key character sequences of N characters to extract contexts as extracted contexts from said retrieval key character sequence in accordance with said retrieval key character sequences;

    context classifying means for classifying said extracted contexts into classified contexts having classification numbers, respectively;

    index retrieving means for retrieving said full-text index in accordance with the sorts of said retrieval key character sequences and said classified contexts to read said character location information as a retrieval result out of said full-text index; and

    detecting means for detecting appearance locations of said retrieval key character sequence in said full-text data base to produce said appearance locations as a detected result.

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