I have a table with no primary key for reasons of efficiency. It
basically consists of a bag of timestamped values associated with a
given id. NHibernate seems to support this scenario by specifying an
<id> element with no name, and AR has a suggestive looking
PrimaryKeyType.None but using it throws an exception:
NHibernate.MappingException
Message: The element 'id' in namespace
'urn:nhibernate-mapping-2.0' has incomplete content. List of possible
elements expected: 'urn:nhibernate-mapping-2.0:meta
urn:nhibernate-mapping-2.0:column urn:nhibernate-mapping-2.0:generator'.
I don't really want to add a primary key to this table because I expect
it to get _very_ large. (It contains a stream of performance data
sampled at regular intervals from dozens of sources. I will probably
switch things over to a better persistence mechanism but not now.)
Jeff.
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