To update a document you need to insert the modified document, then delete the
old one.
Here is some code that I use to get you going in the right direction (it wont
compile, but if you follow it closely you will see how I take an array of
lucene documents with new properties and add them, then delete the old ones.):
public void updateDocuments( Document[] documentsToUpdate )
{
if ( documentsToUpdate.length > 0 )
{
String updateDate = Dates.formatDate( new Date(),
"yyyyMMddHHmm" );
// wait on some other modification to finish
HashSet failedToAdd = new HashSet();
waitToModify();
synchronized(directory)
{
IndexWriter indexWriter = null;
try
{
indexWriter = getWriter();
indexWriter.mergeFactor = 2; //this
seems to be needed to accomodate a lucene (ver 1.4.2) bug
//otherwise the index does not
accurately reflect the change
//load data from new document into old
document
for ( int i = 0; i <
documentsToUpdate.length; i++ )
{
try
{
Document newDoc =
modifyDocument( documentsToUpdate[i], updateDate );
if ( newDoc != null )
{
documentsToUpdate[i] = newDoc;
indexWriter.addDocument( newDoc );
}
else
{
failedToAdd.add( documentsToUpdate[i].get( "messageid" ) );
}
}
catch ( IOException
addDocException )
{
//if we fail to add,
make a note and dont delete it
logger.error( "
["+getContext().getID()+"] error updating message:" +
documentsToUpdate[i].get("messageid") ,addDocException );
failedToAdd.add(
documentsToUpdate[i].get( "messageid" ) );
}
catch (
java.lang.IllegalStateException ise )
{
//if we fail to add,
make a note and dont delete it
logger.error( "
["+getContext().getID()+"] error updating message:" +
documentsToUpdate[i].get("messageid") ,ise );
failedToAdd.add(
documentsToUpdate[i].get( "messageid" ) );
}
}
//if we fail to close the writer, we
dont want to continue
closeWriter();
searcherVersion = -1; //establish that
the searcher needs to update
IndexReader reader = IndexReader.open(
indexPath );
int testid = -1;
for ( int i = 0; i <
documentsToUpdate.length; i++ )
{
Document newDoc =
documentsToUpdate[i];
try
{
logger.debug( "delete
id:" + newDoc.get( "deleteid" ) + " messageid: "
+ newDoc.get(
"messageid" ) );
reader.delete(
Integer.parseInt( newDoc.get( "deleteid" ) ) );
testid =
Integer.parseInt( newDoc.get( "deleteid" ) );
}
catch ( NumberFormatException
nfe )
{
logger.warn( "unable to
parse the deleteid:" + newDoc.get( "deleteid" ) );
}
}
reader.close();
}
catch ( IOException ioe )
{
logger.error( "Unable to update
messages ["+getContext().getID()+"]", ioe );
}
finally
{
searcherVersion = -15;
stateMask -= stateMask &
STATE_MODIFYING;
logUpdate( documentsToUpdate,
failedToAdd );
}
}
}
//optimizeIndex();
}
-----Original Message-----
From: Santosh [mailto:[EMAIL PROTECTED]
Sent: Tuesday, November 23, 2004 2:59 PM
To: Lucene Users List
Subject: modifying existing index
I am using lucene for indexing, when I am creating Index the docuemnts are
added. but when I want to modify the single existing document and reIndex
again, it is taking as new document and adding one more time, so that I am
getting same document twice in the results.
To overcome this I am deleting existing Index and again recreating whole Index.
but is it possibe to index the modified document again and overwrite existing
document without deleting and recreation. can I do this? If so how?
and one more question.
can lucene will be able to do stemming?
If I am searching for "roam" then I know that it can give result for "foam"
using fuzzy query. But my requirement is if I search for "roam" can I get the
similar worlist as output. so that I can show the end user in the column
--------------- do you mean "foam"?
How can I get similar word list in the given content?
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