[jira] [Commented] (DELTASPIKE-421) Find zero or one

["Christian Kaltepoth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DELTASPIKE-421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13784856#comment-13784856 ] 

Christian Kaltepoth commented on DELTASPIKE-421:
------------------------------------------------

+1 for this.

I think this is a really important and useful feature.

> Find zero or one
> ----------------
>
>                 Key: DELTASPIKE-421
>                 URL: https://issues.apache.org/jira/browse/DELTASPIKE-421
>             Project: DeltaSpike
>          Issue Type: New Feature
>          Components: Data-Module
>    Affects Versions: 0.5
>            Reporter: Harald Wellmann
>
> At the moment,
> E findByFoo(T foo)
> behaves like Query.getSingleResult(), i.e. it throws an exception if there is no result or more than one result.
> Dealing with these exceptions is inconvenient when the semantics required by the user is "find zero or one" or "find any one".
> These cases should be supported by
> E findOptionalByFoo(T foo)
> which
> - returns null when there is no result
> - returns the single result when there is exactly one result
> - throws NonUniqueResultException when there is more than one result
> and
> E findAnyByFoo(T foo)
> which
> - returns null when there is no result
> - returns the first result otherwise



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