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From Bon <bon...@unipattern.com>
Subject Why it doesn't work about IndexWriter deleteDocuments
Date Thu, 01 Oct 2009 07:50:55 GMT

Hi all,

    I've a problem about using IndexWriter#deleteDocuments to delete more
then one document at once.
    the following is my code:
    Try 1:
        StringBuffer query_values = new StringBuffer();
        query_values.append(UNIQUEID_FIELD_NAME);
        query_values.append(":(");
        boolean started = false;
        for(int i=0; i<uniqueIds.length; i++) {
    	if(started) query_values.append(" OR ");
    	else started = true;
    	query_values.append("\"");
    	query_values.append(uniqueIds[i]);
    	query_values.append("\"");
        }
        query_values.append(")");
        Query query = new QueryParser(UNIQUEID_FIELD_NAME, new
StandardAnalyzer()).parse(query_values.toString());
        IdxWriter.deleteDocuments(query);
        The Result of Try 1: fail, one document has be deleted

        Try 2:
    	Query[] querys = new Query[uniqueIds.length];
    	QueryParser qp = new QueryParser(UNIQUEID_FIELD_NAME, new
KeywordAnalyzer());
    	for(int i=0; i<querys.length; i++) {
    	    String queryStr = UNIQUEID_FIELD_NAME + ":(\"" + uniqueIds[i] +
"\")";
    	    querys[i] = qp.parse(queryStr);
    	}
        	IdxWriter.deleteDocuments(querys);
        The result of Try 2: fail, one document has be deleted.

        Try 3:
    	for(int i=0; i<uniqueIds.length; i++) {
    	    Term terms = new Term(UNIQUEID_FIELD_NAME, uniqueIds[i]);
        	    IdxWriter.deleteDocuments(terms);
   	}
         The result of Try 3: its work, I can delete all of the document.

        Try 4:
            Term[] terms = new Term[uniqueIds.length];
            for(int i=0; i<terms.length; i++) {
                terms[i] = new Term(UNIQUEID_FIELD_NAME, uniqueIds[i]);
            }
    	IdxWriter.deleteDocuments(terms);
         The result of Try 4: if the uniqueId with more then it will be
fail, no document has be deleted,
            but if the uniqueId just with one, and the document of this id
will be delete by this way!

      Why? and What is wrong in my code? how can I delete multiple documents
with IndexWriter#deleteDocuments ?

Bon

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