Cool man.
The Hits.id(int) worked fine. Thanks for the detailed info.
And hopefully your answer is going to usefull for future Google searches. ;)
Cesar
Steven A Rowe wrote:
>
> Hi Cesar,
>
> On 02/11/2008 at 2:19 PM, Cesar Ronchese wrote:
>> I'm running problems with document deletion.
>> [...]
>> This simply doesn't delete anything from the Index.
>>
>> //see the code sample:
>> //"theFieldName" was previously stored as Field.Store.YES and
>> Field.Index.TOKENIZED.
>> Term t = new Terms("theFieldName", "theFieldContent");
>> objIndexReader.DeleteDocuments(t);
>
> (You have two typos here - "new Term/s/" and /D/eleteDocuments() - I
> assume that this is just a transcription error, since you must have gotten
> this code to run...)
>
> When you construct a Term instance, no analysis will be performed on
> "theFieldContent". Since "theFieldName" is TOKENIZED, it was analyzed,
> and this is likely where the mismatch is occurring. From
> <http://lucene.apache.org/java/2_3_0/api/org/apache/lucene/index/IndexReader.html#deleteDocuments(org.apache.lucene.index.Term)>:
>
> This is useful if one uses a document field to
> hold a unique ID string for the document.
>
> If you're trying to delete documents based on a document ID held as the
> entire value of a field, then you should be using
> Field.Index.UN_TOKENIZED. From
> http://lucene.apache.org/java/2_3_0/api/org/apache/lucene/document/Field.Index.html#UN_TOKENIZED>:
>
> Index the field's value without using an Analyzer,
> so it can be searched. As no analyzer is used the
> value will be stored as a single term. This is
> useful for unique Ids like product numbers.
>
>> 2) DeleteDocument(numDoc) <== this problem is a woot problem
>>
>> [...]
>>
>> I mean, if I call objIndexReader.DeleteDocument(0), it will
>> delete the first document from the entire INDEX, not the
>> first document in the Hits collection. So, it deleted the
>> first documents I have inserted some days ago, in previous
>> indexing sessions.
>
> Yes, this is how this method is designed to function. The javadoc
> description is perhaps too brief: "Deletes the document numbered
> 'docNum'". As you have discovered, "docNum" is the one-up number assigned
> internally by Lucene to each document as it is added to the index.
>
>> I ask: is there a way to get the correct docNum from the
>> document retrieved in the Hits collection?
>
> Check out Hits.id(int):
> <http://lucene.apache.org/java/2_3_0/api/org/apache/lucene/search/Hits.html#id(int)>
>
> The "id" returned by Hits.id(int) is the same thing as the "docNum"
> parameter to IndexReader.deleteDocument(int).
>
> It sounds like the documentation could benefit from some more discussion
> of the "docNum"/document "id" feature...
>
> Steve
>
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>
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