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POFluent NHibernate Automapping: Alter DateTime to Timestamp
 

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  1. POFluent NHibernate Automapping: Alter DateTime to Timestamp
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    <p>I am getting (a little bit to) deep into automapping with the fluent interface of NHibernate. Very nice thing, but I ran into a little problem with DateTimes. I need to change the data format to timestamp, otherwise NHibernate truncates milliseconds.</p> <p>I found several sources of information, the best one was: <a href="http://blog.jagregory.com/2009/01/11/fluent-nhibernate-auto-mapping-type-conventions/" rel="nofollow noreferrer">AutoMapping Info 1</a> where he is changing the column name and type of a property. The problem is, there was a change in the fluent automappings, according to <a href="http://wiki.fluentnhibernate.org/show/diff/ConvertingToNewStyleConventions" rel="nofollow noreferrer">this document</a>.</p> <p>Now I cant figure out how to get the automapping to "change the type". I tried the following code, but I am stuck. Again, what I want to do is simply tell the automapper to: </p> <p><strong>Use Timestamps for DateTime to prevent the truncation of milliseconds when using automapping.</strong></p> <p>Anyone got an idea? Code so far:</p> <pre><code> public class DateTimeToTimestamp : IClassConvention { public bool Accept(IClassMap target) { return target.GetType() == typeof(DateTime); } public void Apply(IClassMap target) { throw new NotImplementedException(); } } </code></pre> <p>Ok, thanks a lot for the answer... Its enough comfort for me that way. If I really have 3 classes which need this precision, I can deal with writing it three times. Especially because the mapping of all other properties works still perfectly, and the following code only alternates the one property I want to... Very nice!</p> <p>If anybody knows a more generic approach, feel free to add it, but for now, I am happy!</p> <p>Code for my case was:</p> <pre><code> public class DateTimeToTimestamp : IAutoMappingOverride&lt;CustomTime&gt; { public void Override(AutoMap&lt;CustomTime&gt; mapping) { mapping.Map(x =&gt; x.ScanDate).CustomTypeIs("timestamp"); } } </code></pre>
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