Above, I should have pointed out the importance of {{FunctionReturn}} extending {{ParameterRegistration}}. Essentially it allows access to the return value. Unlike JPA {{StoredProcedureQuery}}, Hibernate's native {{ProcedureCall}}/{{ProcedureOutputs}} allow access to parameter outputs via the parameter memento:
{code:title=ProcedureOutputs.java|borderStyle=solid}
public interface ProcedureOutputs {
...
public <T> T getOutputParameterValue(ParameterRegistration<T> parameterRegistration);
}
{code}
Having {{FunctionReturn}} extend {{ParameterRegistration}} allows the {{FunctionReturn}} to be passed back in here to retrieve the return value. The other (cleaner, imo) option is to simply define a new method:
{code:title=ProcedureOutputs.java|borderStyle=solid}
public interface ProcedureOutputs {
...
public Object getFunctionReturn();
}
{code}
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