I have an index and one of the items to search for is an identifier that
will always be 3 characters, like ABC or XYZ. If I do a search for ABC I get
no matches. If I add 1 more character so that ABC becomes ABCD and search
for ABCD, it matches. I have been looking through the code (I inherited and
the original coder is no longer with the company) to see if there is any
place where he might have put a limitation in, but testing indicates that it
is creating a query. Some code below:
QueryParser parser = new QueryParser(Version.LUCENE_34,
TaskRecord.BaseFields.PUBLIC_DEFAULT_FIELD.getName(), getAnalyzer());
parser.setDefaultOperator(Operator.AND);
Query query = parser.parse(qstring);
qstring is the search text and getAnalyser returns a StandardAnalyzer.
The Query is then used to search using the following code:
public List<Long> search(Query query) throws IOException
{
IndexReader reader = null;
try
{
reader = IndexReader.open(getRoot(), true);
IndexSearcher searcher = new IndexSearcher(reader);
// Do the search with an artificial limit of 32 results
TopDocs hits = searcher.search(query, 32);
// If the search actually has more hits, then run it again with
correct max
if(hits.totalHits > 32)
{
if(log.isDebugEnabled())
{
log.debug("Rerunning query with max size of " + hits.totalHits + "
" + query);
}
hits = searcher.search(query, hits.totalHits);
}
// Create task ID list and return
if(hits.totalHits < 1)
{
if(log.isDebugEnabled())
log.debug("Query has no hits " + query);
return Collections.emptyList();
}
else
{
if(log.isDebugEnabled())
log.debug("Query has " + hits.totalHits + " hits " + query);
List<Long> taskIds = new ArrayList<Long>(hits.totalHits);
for(ScoreDoc doc: hits.scoreDocs)
{
taskIds.add(Long.valueOf(searcher.doc(doc.doc).get("task")));
}
return taskIds;
}
}
finally
{
try
{
if(reader != null)
reader.close();
}
catch(IOException e)
{
}
}
}
> -----Original Message-----
> From: Chris Hostetter [mailto:[email protected]]
> Sent: Wednesday, September 26, 2012 5:18 PM
> To: [email protected]
> Subject: Re: short search terms
>
>
> : I have a key field that will only ever have a length of 3 characters.
> I am
> : using a StandardAnalyzer and a QueryParser to create the Query
> : (parser.parse(string)), and an IndexReader and IndexSearcher to
> execute the
> : query (searcher(query)). I can't seem to find a setter to allow for a
> 3
> : character search string. There is one setMinWordLen, but it isn't
> applicable
>
> there's a lot of missing information here ... what do you mean "allow
> for
> a 3 character search string" .. the query parser doesn't have anything
> in
> it that would prevent a 3 (or 3, or 1) character search string, so i
> suspect that's not really the question you mean to ask.
>
> what is problem you are actaully seeing? do you have a query that
> isn't
> matching the docs you think it should? what query? what docs? what does
> the code look like?
>
> can you explain more what this 3 character ifeld represents, and how
> you
> want to use it?
>
> https://people.apache.org/~hossman/#xyproblem
> Your question appears to be an "XY Problem" ... that is: you are
> dealing
> with "X", you are assuming "Y" will help you, and you are asking about
> "Y"
> without giving more details about the "X" so that we can understand the
> full issue. Perhaps the best solution doesn't involve "Y" at all?
> See Also: http://www.perlmonks.org/index.pl?node_id=542341
>
> -Hoss
>
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