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From "Thomas Fox (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TORQUE-233) Exception translation
Date Sun, 14 Oct 2012 04:16:03 GMT

    [ https://issues.apache.org/jira/browse/TORQUE-233?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13475765#comment-13475765
] 

Thomas Fox commented on TORQUE-233:
-----------------------------------

A constraint for solving this is that we do not want Torque to depend on the various driver
classes.
So a feasible way seems to be to look at the sqlState of the SQLException (this seems to be
standardised a bit) and check whether the sqlState matches a certain pattern.
This seems feasible so far (checked derby, mysql, postgresql) for constraint violations (though
finding out whether the constraint is a unique key, foreign key, not null constraint is not
possible in mysql) and for deadlocks. 

I'll create a possible solution and test cases and then check with other databases
                
> Exception translation
> ---------------------
>
>                 Key: TORQUE-233
>                 URL: https://issues.apache.org/jira/browse/TORQUE-233
>             Project: Torque
>          Issue Type: Wish
>          Components: Runtime
>    Affects Versions: 4.0-beta1
>            Reporter: Thomas Fox
>
> Currently, there is no portable way to determine the reason of an Exception.
> E.g. if an exception occurs during saving, it could be due to a unique key violation.
> It would be nice such a Violation would result in a special subclass of TorqueException,
so the reason could be determined in a way portable across databasess
> (Currently one can look at the root cause of the Torque exception and then e.g. form
ysql check whether it's a MySQLIntegrityConstraintViolationException, but of course this is
not portable across databases)

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