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

["Harald Wellmann (JIRA)" <ji...@apache.org>]

Harald Wellmann created DELTASPIKE-421:
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             Summary: 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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