Maarten Balliauw • 7/23/2007

NHibernate 1.2.0 - Unexpected row count: 0; expected: 1

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The article details a specific NHibernate 1.2.0 error ('Unexpected row count: 0; expected: 1') encountered when using SqlClient after switching from MySQL. It explains the root cause: using an 'assigned' generator for a manually populated ID column with SaveOrUpdate(). The solution involves changing the mapping to use a separate GUID ID column, allowing NHibernate to manage the primary key.

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#error handling #database #orm
NHibernate 1.2.0 - Unexpected row count: 0; expected: 1

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