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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