add getSingleResult() to PropertyQuery
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Key: WELDX-177
URL: https://jira.jboss.org/browse/WELDX-177
Project: Weld Extensions
Issue Type: Feature Request
Affects Versions: 1.0.0.Beta1
Reporter: Dan Allen
Fix For: 1.0.0.Beta2
PropertyQuery should offer the method getSingleResult() for the same reason it
exists in the JPA Query interface: to fetch a single result but also assert
that there is only one result to be fetched. If more than one property is
matched when getSingleResult() is called, an exception will result.
Using getFirstResult() to return exactly one result is inappropriate (and could
lead to bugs) because it could hide the fact that multiple properties are being
inadvertently matched. As a workaround, the developer would currently have to
run getResultList() to ensure only one property matches. Offering a
getSingleResult() would resolve these issues.
See
http://download.oracle.com/javaee/6/api/javax/persistence/Query.html#getSingleResult()
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