如何在 Lucene 搜索中匹配精确文本？

Question

Im trying to match a text Config migration from ASA5505 8.2 to ASA5516 in column TITLE .

My program looks like this.

Directory directory = FSDirectory.open(indexDir);

MultiFieldQueryParser queryParser = new MultiFieldQueryParser(Version.LUCENE_35,new String[] {"TITLE"}, new StandardAnalyzer(Version.LUCENE_35));        
IndexReader reader = IndexReader.open(directory);
IndexSearcher searcher = new IndexSearcher(reader);       
queryParser.setPhraseSlop(0);
queryParser.setLowercaseExpandedTerms(true);
Query query = queryParser.parse("TITLE:Config migration from ASA5505 8.2 to ASA5516");
System.out.println(queryStr);
TopDocs topDocs = searcher.search(query,100);
System.out.println(topDocs.totalHits);
ScoreDoc[] hits = topDocs.scoreDocs;
System.out.println(hits.length + " Record(s) Found");
for (int i = 0; i < hits.length; i++) {
    int docId = hits[i].doc;
    Document d = searcher.doc(docId);
    System.out.println("\"Title :\" " +d.get("TITLE") );
}

But its returning

"Title :" Config migration from ASA5505 8.2 to ASA5516
"Title :" Firewall  migration from ASA5585 to  ASA5555
"Title :" Firewall  migration from ASA5585 to  ASA5555

Second 2 results are not expected.So what modification required to match exact text Config migration from ASA5505 8.2 to ASA5516

And my indexing function looks like this

public class Lucene {
public static final String INDEX_DIR = "./Lucene";
private static final String JDBC_DRIVER = "oracle.jdbc.OracleDriver";
private static final String CONNECTION_URL = "jdbc:oracle:thin:xxxxxxx"

private static final String USER_NAME = "localhost";
private static final String PASSWORD = "localhost";
private static final String QUERY = "select * from TITLE_TABLE";

public static void main(String[] args) throws Exception {
    File indexDir = new File(INDEX_DIR);
    Lucene indexer = new Lucene();
    try {
        Date start = new Date();
        Class.forName(JDBC_DRIVER).newInstance();
        Connection conn = DriverManager.getConnection(CONNECTION_URL, USER_NAME, PASSWORD);
        SimpleAnalyzer analyzer = new SimpleAnalyzer(Version.LUCENE_35);
        IndexWriterConfig indexWriterConfig = new IndexWriterConfig(Version.LUCENE_35, analyzer);
        IndexWriter indexWriter = new IndexWriter(FSDirectory.open(indexDir), indexWriterConfig);
        System.out.println("Indexing to directory '" + indexDir + "'...");
        int indexedDocumentCount = indexer.indexDocs(indexWriter, conn);
        indexWriter.close();
        System.out.println(indexedDocumentCount + " records have been indexed successfully");
        System.out.println("Total Time:" + (new Date().getTime() - start.getTime()) / (1000));
    } catch (Exception e) {
        e.printStackTrace();
    }
}

int indexDocs(IndexWriter writer, Connection conn) throws Exception {
    String sql = QUERY;
    Statement stmt = conn.createStatement();
    stmt.setFetchSize(100000);
    ResultSet rs = stmt.executeQuery(sql);
    int i = 0;
    while (rs.next()) {
        System.out.println("Addind Doc No:" + i);
        Document d = new Document();
        System.out.println(rs.getString("TITLE"));
        d.add(new Field("TITLE", rs.getString("TITLE"), Field.Store.YES, Field.Index.ANALYZED));
        d.add(new Field("NAME", rs.getString("NAME"), Field.Store.YES, Field.Index.ANALYZED));
        writer.addDocument(d);
        i++;
    }
    return i;
}
}

Answer 1

Try PhraseQuery as follow:

BooleanQuery mainQuery= new BooleanQuery(); 
String searchTerm="config migration from asa5505 8.2 to asa5516";
String strArray[]= searchTerm.split(" ");
for(int index=0;index<strArray.length;index++)
{
    PhraseQuery query1 = new PhraseQuery();
     query1.add(new Term("TITLE",strArray[index]));
     mainQuery.add(query1,BooleanClause.Occur.MUST);
}

And then execute the mainQuery .

Check out this thread of stackoverflow, It may help you to use PhraseQuery for exact search.

Answer 2

PVR is correct, that using a phrase query is probably the right solution here, but they missed on how to use the PhraseQuery class. You are already using QueryParser though, so just use the query parser syntax by enclosing you search text in quotes:

Query query = queryParser.parse("TITLE:\"Config migration from ASA5505 8.2 to ASA5516\"");

---

Based on your update, you are using a different analyzer at index-time and query-time. SimpleAnalyzer and StandardAnalyzer don't do the same things. Unless you have a very good reason to do otherwise, you should analyze the same way when indexing and querying.

So, change the analyzer in your indexing code to StandardAnalyzer (or vice-versa, use SimpleAnalyzer when querying), and you should see better results.

Answer 3

Here is what i have written for you which works perfectly:

USE: queryParser.parse("\\"Config migration from ASA5505 8.2 to ASA5516\\"");

1. To create indexes

   public static void main(String[] args) { IndexWriter writer = getIndexWriter(); Document doc = new Document(); Document doc1 = new Document(); Document doc2 = new Document(); doc.add(new Field("TITLE", "Config migration from ASA5505 8.2 to ASA5516",Field.Store.YES,Field.Index.ANALYZED)); doc1.add(new Field("TITLE", "Firewall migration from ASA5585 to ASA5555",Field.Store.YES,Field.Index.ANALYZED)); doc2.add(new Field("TITLE", "Firewall migration from ASA5585 to ASA5555",Field.Store.YES,Field.Index.ANALYZED)); try { writer.addDocument(doc); writer.addDocument(doc1); writer.addDocument(doc2); writer.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static IndexWriter getIndexWriter() { IndexWriter indexWriter=null; try { File file=new File("D://index//"); if(!file.exists()) file.mkdir(); IndexWriterConfig conf=new IndexWriterConfig(Version.LUCENE_34, new StandardAnalyzer(Version.LUCENE_34)); Directory directory=FSDirectory.open(file); indexWriter=new IndexWriter(directory, conf); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return indexWriter; }

   }

2.To search string

    public static void main(String[] args) 
    {

    IndexReader reader=getIndexReader();

    IndexSearcher searcher = new IndexSearcher(reader);

    QueryParser parser = new QueryParser(Version.LUCENE_34, "TITLE" ,new StandardAnalyzer(Version.LUCENE_34));

    Query query;
    try 
    {
    query = parser.parse("\"Config migration from ASA5505 8.2 to ASA5516\"");

    TopDocs hits = searcher.search(query,3);

    ScoreDoc[] document = hits.scoreDocs;
    int i=0;
    for(i=0;i<document.length;i++)
    {
        Document doc = searcher.doc(i);

        System.out.println("TITLE=" + doc.get("TITLE"));
    }
        searcher.close();

    } 
    catch (Exception e) 
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } 
            }

public static IndexReader getIndexReader()
{
    IndexReader reader=null;

    Directory dir;
    try 
    {
        dir = FSDirectory.open(new File("D://index//"));
        reader=IndexReader.open(dir);
    } catch (IOException e) 
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    return reader;
}