Firstly, please do not double-post, other comments inline:
On Mon, 26 Jul 2004, lingaraju wrote:
> Dear All
>
> I need help to update the index created for the database search
>
> I created the index with three field mapping to the three column of
> database(oid(primarykey),title, contents)
> Then I created the document for each row and added to the writer
>
> doc.add(Field.Keyword("OID",oid+""));
> doc.add(Field.Text("title",title));
> doc.add(Field.Text("contents",contents));
> writer.addDocument(doc);
>
> Here search is only on title and the contents and oid is the key to retrieve the
> details from the database.
>
> Later if the "contents" column in the database is updated. We have to updated the
> content in the index also
>
> If I use the writer with false
>
> IndexWriter writer = new IndexWriter("C\index", new StandardAnalyzer(),false);
>
> then all the record are inserted in to index without deleting the old index causing
> duplication
It's a question of efficiency. The procedure for doing updates is
described here:
http://wiki.apache.org/jakarta-lucene/UpdatingAnIndex
In a nutshell, it's up to you to decide when a record is modified and
needs to be removed, then readded (there is no update)
> If I use the writer with true
>
> IndexWriter writer = new IndexWriter("C\index", new StandardAnalyzer(),false);
>
> then record are inserted in to index deleting all the old index.
>
> My question is
> 1) How to update the existing index
> 2) When I fetch the rows from the database in order to update or insert in index how
> to know which record is modified in database and which record is not present is index
>
> Thanks is advance
> Raju
>
sv
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