search in rdf by index

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Java

RDF

i want to search text in rdf by sparql query using index, the code is not showing error but returning no result, is should show the matched text.pls help

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//indexing
// -- Read and index all literal strings.
IndexBuilderString larqBuilder = new IndexBuilderString() ;

// -- Index statements as they are added to the model.
model3.register(larqBuilder) ;

FileManager.get().readModel(model3, MY_LOG_FILE1) ;

// -- Finish indexing
larqBuilder.closeWriter() ;
model3.unregister(larqBuilder) ;

// -- Create the access index  
IndexLARQ index = larqBuilder.getIndex() ;
	
// index registration
		
// -- Make globally available
LARQ.setDefaultIndex(index) ;
			
String queryString =" PREFIX db:  select  ?object  { ?object db:textMatch  '"+SearchObject+"'}" ;
Query query = QueryFactory.create(queryString) ;
QueryExecution qExec = QueryExecutionFactory.create(query, model3) ;
ResultSetFormatter.out(System.out, qExec.execSelect(), query) ;