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https://issues.apache.org/jira/browse/JENA-307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13442423#comment-13442423
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Andy Seaborne commented on JENA-307:
------------------------------------
Related to JENA-305
Yes, it's sort of a bug. Better management of QueryExecution objects is
required.
The executeQuery method in SPARQL_Query sets up the result set but does not
fully execute the query. Closing the execution at that point will cause no
results to be returned.
One way would be to attach them to the HttpActionQuery object for final
clearup. Indeed, adding a mechanism to HttpAction for action finalizers would
be one general appraoch (a similar mechanism as was done in Joseki).
Or pull up the initial code from executeQuery so teh QueryExecution object is
available after sendResults.
> QueryExecution is not being closed in SPARQL_Query.execute method.
> -------------------------------------------------------------------
>
> Key: JENA-307
> URL: https://issues.apache.org/jira/browse/JENA-307
> Project: Apache Jena
> Issue Type: Question
> Components: Fuseki
> Affects Versions: Fuseki 0.2.4
> Reporter: Priyaranjan
>
> QueryExecution is not being closed in SPARQL_Query.execute method.
> In the execute method , after sending the results , only the dataset.end()
> method is called to end the transation. But the QueryExecution that
> was created is never closed.
> This is in contrary to the examples provided at
> http://jena.apache.org/documentation/tdb/tdb_transactions.html for Read
> Transcations ,
> where the qExec.close is called before calling dataset.end
> Location location = ... ;
> Dataset dataset = ... ;
> dataset.begin(ReadWrite.READ) ;
> try {
> QueryExecution qExec = QueryExecutionFactory.create("SELECT * {?s ?p ?o}
> LIMIT 10", dataset) ;
> ResultSet rs = qExec.execSelect() ;
> try {
> ResultSetFormatter.out(rs) ;
> } finally { qExec.close() ; }
> // Another query - same view of the data.
> qExec = QueryExecutionFactory.create("SELECT * {?s ?p ?o} OFFSET 10
> LIMIT 10", dataset) ;
> rs = qExec.execSelect() ;
> try {
> ResultSetFormatter.out(rs) ;
> } finally { qExec.close() ; }
> } finally { dataset.end() ; }
> Is this a bug in Fuseki ?
> In my application , I am creating a database connection , when the
> QueryExecution is created , and I need to close the connection when
> the QueryExecution is closed.
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