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

["František Kučera (Jira)" <ji...@apache.org>]

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

František Kučera updated JENA-1939:
-----------------------------------
    Summary: getUpdateCount() in the JDBC driver returns incorrect value - it looks like there are always more results (infinite loop)  (was: getUpdateCount() in the JDBC driver returns incorrect value - it looks that there are always more results (infinite loop))

> 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
>            Priority: Major
>         Attachments: jena-jdbc-updateCount-patch-01.diff
>
>
> Method {{JenaStatement.getUpdateCountn()}} returns 0. But [java.sql.Statement|https://docs.oracle.com/javase/8/docs/api/java/sql/Statement.html#getUpdateCount--] says:
> ??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:
> ??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 attached patch could resolve this issue.
> P.S. Is there a way to return actual count of updated records? ({{UpdateProcessor.execute()}} returns void).



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