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From "Houx Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-4443) Wrap rollback in exception handlers in try-catch
Date Thu, 17 Mar 2011 14:25:29 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13007926#comment-13007926
] 

Houx Zhang commented on DERBY-4443:
-----------------------------------

Thanks for your advice, Aaron. 

Mock extending InternalDriver seems a good idea. Overriding prepareStatement(String sql) can
throw a SQLException for invoking code for rollback, and overriding rollback() can test the
new wrapping!

However, I'm still puzzled. It's related to a key problem---- How to inject the mock for SystemProcedures
when testing? 

Wish for your reply!

> Wrap rollback in exception handlers in try-catch
> ------------------------------------------------
>
>                 Key: DERBY-4443
>                 URL: https://issues.apache.org/jira/browse/DERBY-4443
>             Project: Derby
>          Issue Type: Bug
>          Components: Demos/Scripts, Documentation, Eclipse Plug-in, JDBC, Network Client,
Network Server, Replication, Services, SQL, Test, Tools
>    Affects Versions: 10.5.3.0
>            Reporter: Aaron Digulla
>              Labels: derby_triage10_8
>         Attachments: DERBY-4443.patch
>
>
> Avoid this pattern everywhere:
> 		}catch(SQLException se){
> 			//issue a rollback on any errors
> 			conn.rollback();
> 			throw  se;
> 		}
> because an error in rollback will shadow the original exception.

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