Dear Neal,
I appreciate so much for your help!
Even though I updated the code as follows, there are still no results
for the term-based search.
......
IndexSearcher searcher = new IndexSearcher(fsDirectory);
Term term = new Term(searchField, searchKeyword);
TermQuery termQuery = new TermQuery(term);
Hits results = searcher.Search(termQuery);
......
However, the Query search got results. The searchKeyword is just an
ordinary word, no any special characters, since I just want to learn
how to use Term to use.
Any particular requirements to generate the index? I can figure out
the problems.
Thanks so much!
LB
On Tue, Aug 25, 2009 at 2:37 AM, Granroth, Neal
V.<[email protected]> wrote:
>
> The difference in operation would be due to differences in the search
> requested by the two sections of code. What does searchKeyword contain?
> QueryParser may be splitting the string into multiple terms.
> The code shown for BooleanQuery will only work when searchKeyword is a single
> term. That is, it will search for the text specified as a single term.
>
>
> By the way, as the code shown for BooleanQuery only uses a single term, the
> clause Occur.MUST or Occur.Should is unimportant. For a single term there is
> really no need for the BooleanQuery object at all, you could instead use the
> TermQuery object directly in the call to Search()
>
>
> -- Neal
>
> -----Original Message-----
> From: Li Bing [mailto:[email protected]]
> Sent: Monday, August 24, 2009 1:12 PM
> To: [email protected]
> Cc: [email protected]
> Subject: Re: Query vs. BooleanQuery
>
> I tried. But it still doesn't work.
>
> Thanks so much!
> LB
>
> On Tue, Aug 25, 2009 at 1:20 AM, [email protected]<[email protected]> wrote:
>> It is due to :
>>
>> booleanQuery.Add(termQuery, BooleanClause.Occur.MUST);
>>
>> Change it to
>>
>> booleanQuery.Add(termQuery, BooleanClause.Occur.SHOULD);
>>
>> and you'll see same results.
>>
>>
>> Li Bing:
>>>
>>> Dear all,
>>>
>>> (The codes in the previous email have something specific in my
>>> applications. I made changes in this email)
>>>
>>> I tried to search using two approaches, Query and BooleanQuery. To my
>>> surprise, the two behaves different on the same index? Or I made
>>> something wrong?
>>>
>>> On the same index, Query can get results whereas BooleanQuery get NOTHING.
>>> Why?
>>>
>>> The codes are shown as follows.
>>>
>>> Using Query,
>>>
>>> ......
>>> IndexSearcher searcher = new IndexSearcher(fsDirectory);
>>> Analyzer chineseAnalyzer = new ChineseAnalyzer();
>>> QueryParser queryParser = new QueryParser(searchField,
>>> chineseAnalyzer);
>>> Query query = queryParser.Parse(searchKeyword);
>>> Hits results = searcher.Search(query);
>>> ......
>>>
>>> Using BooleanQuery,
>>>
>>> ......
>>> IndexSearcher searcher = new IndexSearcher(fsDirectory);
>>> Term term = new Term(searchField, searchKeyword);
>>> TermQuery termQuery = new TermQuery(term);
>>> BooleanQuery booleanQuery = new BooleanQuery();
>>> booleanQuery.Add(termQuery, BooleanClause.Occur.MUST);
>>> Hits results = searcher.Search(booleanQuery);
>>> ......
>>>
>>> I think the codes should be correct. But why do they get different
>>> results on the same index?
>>>
>>> Thanks so much for your help!
>>> LB
>>>
>>>
>>>
>>
>>
>
