We have an NHibernate app that we are migrating from SQL Server to Oracle. Our optimistic concurrency is implemented via a <timestamp name="Version"> mapping element.
The data type of the corresponding Version column in Oracle is DATE. After we save an object, the in-memory C# object is left with a timestamp value in milliseconds (e.g. 12:34:56.789) while the value in the database is precise only to the second (e.g. 12:34:56). Thus, if we attempt to save the object a 2nd time, we get a StaleStateException because the two values do not match.
I attempted to fix this by altering the data type of the Version column to TIMESTAMP(3). Unfortunately, the C# object and the DB value are still off by one millisecond (e.g. 12:34:56.789 vs 12:34:56.788), so the 2nd attempt to save the object still causes a StaleStateException.
What can I do to create a working <timestamp> mapping to an Oracle column of type DATE or TIMESTAMP so that the same object can be saved multiple times?
Thanks.
-- Brian
