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POStruggling to Comprehend nHibernate SchemaUpdate, even with Blog Posts
 

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  1. POStruggling to Comprehend nHibernate SchemaUpdate, even with Blog Posts
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    <p>I've seen the various blog posts concerning nHibernate's <code>SchemaUpdate</code>, and even <code>Ayende's</code> very good example, and downloaded the samples, but for some reason I cannot get the same same thing to work for me. I will note that I am using <code>Fluent NHibernate</code>, but from what I can tell that should not make too huge a difference.</p> <h2>Update</h2> <blockquote> <p>I have reached the point where the <code>SchemaUpdate</code> runs, but it is just a full schema creation, no 'altering'. In otherwords, it's the same as if I just built the database fresh. I am posting my full source below.</p> </blockquote> <p>Here Is what I am basically trying... I think it is generally self obvious, but basically I am creating a <code>Configuration</code> object using the Fluent Configuration, and then trying to pass it in. Unit Tests pass, programs run ...but nothing actually happens. I can never see any results, and I can never see the database schema get updated. </p> <blockquote> <p>Database gets created (missing columns, etc)</p> <p>Database then gets mapped with new schema on next run.</p> <p>Database (Update) should update the Schema per the Update method.</p> </blockquote> <p>But that isn't what is actually happening.</p> <p>I also looked at other posts on the matter. Like here : <a href="http://morten.lyhr.dk/2008/03/nhibernates-schemaupdate-feature.html" rel="nofollow noreferrer">http://morten.lyhr.dk/2008/03/nhibernates-schemaupdate-feature.html</a></p> <p>Additionally, I have changed my code after finding the following Stack Overflow post <a href="https://stackoverflow.com/questions/2483424/make-fluent-nhibernate-output-schema-update-to-file">Make Fluent NHibernate output schema update to file</a></p> <p>And even with the sample code was not able to make heads or tails of this feature.</p> <h2>Code</h2> <pre><code> private static void UpdateSchema(NHibernate.Cfg.Configuration Config) { System.Action&lt;string&gt; updateExport = x =&gt; { using (var file = new System.IO.FileStream(@"C:\Users\User\Documents\Visual Studio 2010\Mappings\update.sql", System.IO.FileMode.Append, System.IO.FileAccess.Write)) using (var sw = new System.IO.StreamWriter(file)) { sw.Write(x); sw.Close(); } }; NHibernate.Tool.hbm2ddl.SchemaUpdate SchemaUpdater = new NHibernate.Tool.hbm2ddl.SchemaUpdate(Config); SchemaUpdater.Execute(updateExport, false); } public static ISessionFactory Map(string connectionString) { // fluently configure an ms-sql 2008 database return FluentNHibernate.Cfg.Fluently.Configure() .Database(FluentNHibernate.Cfg.Db.MsSqlConfiguration.MsSql2008 .ConnectionString(c =&gt; c.Is(connectionString)) .AdoNetBatchSize(50) .FormatSql() .UseReflectionOptimizer()) .Cache(c =&gt; c .ProviderClass&lt;NHibernate.Caches.SysCache2.SysCacheProvider&gt;() .UseQueryCache() .UseSecondLevelCache() .UseMinimalPuts()) .Mappings(m =&gt; { m.FluentMappings.Conventions.Setup(x =&gt; { x.AddFromAssemblyOf&lt;Mappings.AspectMap&gt;(); x.Add&lt;EnumConvention&gt;(); x.Add(FluentNHibernate.Conventions.Helpers.AutoImport.Never()); }); m.FluentMappings.AddFromAssembly(System.Reflection.Assembly.GetExecutingAssembly()); }) .ExposeConfiguration(UpdateSchema) .BuildSessionFactory(); } </code></pre>
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    1. COCeil, I haven't tried SchemaUpdate with Fluent NHibernate, but with mapping files, the .hbm file is embedded as a resource into your DataLayer.dll. The update compares the current schema to the intended schema and adds anything that's missing.
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    2. COare you willing to try any other approach for upgrading your schema or do you want to stick to schemaupdate
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    3. COI am willing to try a different approach.
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