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From Ian Lea <ian....@blackwell.co.uk>
Subject Re: database searching and lucene
Date Mon, 12 Nov 2001 11:00:40 GMT
> I have read in past that lucene can work on any database using JDBC.
> Can anyone please guide me where can I find documents or the source code
> which will help me to search on the database using lucene?

Lucene works on Documents that you fill with data that you get from
anywhere you like.  To index data in a database table you could use
something like:

	Analyzer analyzer = new StandardAnalyzer(); 
	IndexWriter writer = new IndexWriter("dbindex", analyzer, true);
	Connection conn = getConnection();
	String sql = "select id, firstname, lastname from people";
	Statement stmt = conn.createStatement(sql);
	ResultSet rs = stmt.executeQuery();
	while (rs.next()) {
	    Document d = new Document();
	    d.add(Field.Text("id", rs.getString("id")));
	    d.add(Field.UnStored("firstname", rs.getString("firstname")));
	    d.add(Field.UnStored("lastname", rs.getString("lastname")));
	    writer.addDocument(d);
	}
	writer.close();

The id field is indexed and stored since will want to extract it from lucene.
The name fields are not stored since they are already stored on the database,
although you could store them if wanted to avoid having to go back to the
database for display.


To search and display results, with details coming from the database,
something along the lines of:

	Searcher searcher = new IndexSearcher(IndexReader.open("dbindex"));
	Query query = QueryParser.parse("fred", "firstname", analyzer);
	Hits hits = searcher.search(query);
	String sql = "select * from people where id = ?";
	PreparedStatement pstmt = conn.prepareStatement(sql);
	for (int i = 0; i < hits.length(); i++) {
	    String id = hits.doc(i).get("id");
	    pstmt.setString(1, id);
	    displayResults(pstmt);
	}



Hope this helps.



--
Ian.
ian.lea@blackwell.co.uk

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