[jboss-jira] [JBoss JIRA] (DROOLS-31) RowAdapter should not throw Exception when Object not found

[Mario Fusco (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-31?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco resolved DROOLS-31.
-------------------------------

    Resolution: Won't Fix


You can know the name of the columns from the metadata. Moreover returning null is semantically wrong because you won't be able to distinguish it from an actual result returning null.
                
> RowAdapter should not throw Exception when Object not found
> -----------------------------------------------------------
>
>                 Key: DROOLS-31
>                 URL: https://issues.jboss.org/browse/DROOLS-31
>             Project: Drools
>          Issue Type: Enhancement
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 5.5.0.Final
>            Reporter: Ryan Nideffer
>            Assignee: Mario Fusco
>
> RowAdapter throws an undocumented, unchecked exception if an identifier passed to get() does not exist as a row in the returned query.
> This pattern is not ideal, and instead should simply return null, thereby allowing clients to easily skip non-existent objects much more cleanly and more lightweight than exception handling.
> Additionally, the ViewChangedEventListener interface does not provide a way to know which query was invoked for the callback. It is cumbersome to create per-query ViewChangedEventListener objects which allows you to avoid querying identifiers that you know exist in the query result callback.

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