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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-4313) JDBC.dropUsingDMD() may skip dropping objects
Date Fri, 17 Jul 2009 17:19:14 GMT

     [ https://issues.apache.org/jira/browse/DERBY-4313?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Knut Anders Hatlen updated DERBY-4313:

    Issue & fix info: [Patch Available]

suites.All ran cleanly with the patch. I haven't run derbyall since the patch only touches
code used by the JUnit tests.

> JDBC.dropUsingDMD() may skip dropping objects
> ---------------------------------------------
>                 Key: DERBY-4313
>                 URL: https://issues.apache.org/jira/browse/DERBY-4313
>             Project: Derby
>          Issue Type: Bug
>          Components: Test
>    Affects Versions:
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>            Priority: Minor
>         Attachments: dropUsingDMD.diff
> This loop in JDBC.dropUsingDMD() looks broken:
>         // Remove any statements from the list that succeeded.
> 		boolean didDrop = false;
> 		for (int i = 0; i < results.length; i++)
> 		{
> 			int result = results[i];
> 			if (result == -3 /* Statement.EXECUTE_FAILED*/)
> 				hadError = true;
> 			else if (result == -2/*Statement.SUCCESS_NO_INFO*/)
> 				didDrop = true;
> 			else if (result >= 0)
> 				didDrop = true;
> 			else
> 				Assert.fail("Negative executeBatch status");
>             if (didDrop)
>                 ddl.set(i, null);
> 		}
> It is supposed to check the status of each individual statement executed in a batch,
and clear the successful ones from an ArrayList so that only the unsuccessful ones are left.
> However, if one of the statements is reported to have failed, and one of the proceeding
statements has been successful, the failed statement will be removed from the ArrayList because
didDrop is true. This means that some of the failed statements are not retried later. The
statements normally fail because some other object depends on the object being dropped, and
they usually succeed when they are retried after the other objects have been dropped. By not
retrying, some objects that were supposed to be dropped may be left in the database.

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