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From "jitender ahuja" <ajiten...@aalayance.com>
Subject Re: Conversion of Query object to a String object in 1.2 ver.
Date Sat, 17 Apr 2004 10:59:45 GMT
Hi Erik,

              Thanks for your detailed response. It works now in a jsp page.

Regards,
Jitender

----- Original Message ----- 
From: "Erik Hatcher" <erik@ehatchersolutions.com>
To: "Lucene Developers List" <lucene-dev@jakarta.apache.org>
Sent: Saturday, April 17, 2004 4:08 PM
Subject: Re: Conversion of Query object to a String object in 1.2 ver.


> What is even more confusing is why you would take a perfectly good
> Query object, convert it to a String, and then parse it back to get a
> Query object.  You've already got a Query, just hand it to the search
> method and forget about QueryParser altogether in the code you have.
>
> The whole point of QueryParser it to take a string expression and turn
> it into a Query - which you've already got.
>
> Going back and forth from Query.toString and QueryParser is going to be
> problematic in most cases due to analysis.  It can be a lossy
> conversion from String->QueryParser->toString
>
> Erik
>
> On Apr 17, 2004, at 4:23 AM, jitender ahuja wrote:
>
> >
> > // kindly take my earlier mail as invalid as the Query object is shown
> > in the attached code without conversion
> >
> > Hi all,
> >           I intend to convert Query object to a String object for the
> > purpose of passing it to the parse method of the QueryParser class
> > i.e.,
> > Query query = QueryParser.parse(searchStr.toString(), field name ,
> > analyzer);        // searchStr is the query string passed
> > but, it retrieves nothing as output , whatsoever.
> >
> > I  am quite confused as how to usefully convert a Query object to a
> > String.
> >
> >  Even the Hits object, i.e. ,  hits = indexSrch.search(query),
> > returned by a searcher object of my own class Searcher yields nothing.
> >
> > Regards,
> > Jitender
> >
> > //////////////////////////////////////////////////////////////////////
> > //////////////////////////////////////////////////////////////////////
> > ///////////////////////////
> > My searcher class is stated below :
> >
> >
> > public class Searcher {
> >
> >   public static void main(String[] args) {
> >
> >   }
> >
> >   public static Hits searchDB(Query searchStr) // it has to be a query
> > type parameter as the
> >
> > //results.jsp has stmt. : Hits hits = searcher.searchDB(query)
> >   {
> >      ArrayList results = new ArrayList();
> >      Hits hits = null;
> >
> >      try {
> >        //search on index directory
> >        Searcher indexSrch = new IndexSearcher("C:\\Temp\\DBDEX_GT");
> > // index already delivers by a seperate code
> >        Analyzer analyzer = new StandardAnalyzer();
> >
> >        //create a query to search for the target string in the
> > description field
> >        Query query = QueryParser.parse(searchStr.toString(), contents,
> > analyzer);
> >
> >        hits = indexSrch.search(query);   // returns nothing and no
> > output is displayed for the next two print stmts.
> >        System.out.println(hits);              // displays nothing
> >        System.out.println(hits.length() + " total matching
> > documents");   // displays nothing
> >
> >     }
> >       catch (ParseException ex1) {
> >       ex1.printStackTrace();
> >
> >     }
> >     catch (IOException ex) {
> >       ex.printStackTrace();
> >
> >     }catch(Exception e){
> >     e.printStackTrace();
> >   }
> >      return hits;
> >   }
> >  }
> > }
>
>
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