[jira] [Assigned] (JENA-1939) getUpdateCount() in the JDBC driver returns incorrect value - it looks like there are always more results (infinite loop)

["Andy Seaborne (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-1939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne reassigned JENA-1939:
-----------------------------------

    Assignee: Rob Vesse

> getUpdateCount() in the JDBC driver returns incorrect value - it looks like there are always more results (infinite loop)
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: JENA-1939
>                 URL: https://issues.apache.org/jira/browse/JENA-1939
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: JDBC
>            Reporter: František Kučera
>            Assignee: Rob Vesse
>            Priority: Major
>             Fix For: Jena 3.17.0
>
>         Attachments: jena-jdbc-updateCount-patch-01.diff
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> The method {{JenaStatement.getUpdateCount()}} returns 0. But [java.sql.Statement|https://docs.oracle.com/javase/8/docs/api/java/sql/Statement.html#getUpdateCount--] documentation says:
> bq. Returns: the current result as an update count; -1 if the current result is a ResultSet object or there are no more results
> Returning correct value is important because a single statement may have multiple result sets and cause mutiple updates (not only multiple updated records, but multiple sets of updated records).
> Applications (e.g. [SQL-DK|http://sql-dk.globalcode.info/]) iterate over these multiple results and need to know when finish. The [getMoreResults()|https://docs.oracle.com/javase/8/docs/api/java/sql/Statement.html#getMoreResults--] documentation says:
> bq. There are no more results when the following is true: {{((stmt.getMoreResults() == false) && (stmt.getUpdateCount() == -1))}}
> But if 0 is returned, the application enters infinite loop.
> I think that [change in my branch|https://git-zaloha.frantovo.cz/gitbox.apache.org/repos/asf/jena.git/log/?h=JENA-1939_updateCount] could resolve this issue (also attached as a patch).
> P.S. Is there a way to return actual count of updated records? ({{UpdateProcessor.execute()}} returns void).



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