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POEntity Framework CTP 4 - Code First Custom Database Initializer
 

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  1. POEntity Framework CTP 4 - Code First Custom Database Initializer
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    <p>I would like to implement a custom database initialization strategy so that I can generate the database schema and apply it to an EXISTING EMPTY SQL database using a supplied User ID and Password. </p> <p>Unfortunately the built-in strategies don’t provide what I’m looking for:</p> <pre><code>// The default strategy creates the DB only if it doesn't exist - but it does // exist so this does nothing Database.SetInitializer(new CreateDatabaseOnlyIfNotExists&lt;DataContext&gt;()); // Drops and re-creates the database but then this breaks my security mapping and // only works if using a “Trusted" connection Database.SetInitializer(new RecreateDatabaseIfModelChanges&lt;DataContext&gt;()); // Strategy for always recreating the DB every time the app is run. – no good for // what I want Database.SetInitializer(new AlwaysRecreateDatabase&lt;DataContext&gt;()); </code></pre> <p>I have worked out the following but this does not create the ModelHash so I’m unable to use <strong>"context.Database.ModelMatchesDatabase()"</strong> to validate that the database schema has been created and prevent multiple initializations:</p> <pre><code>public class Initializer : IDatabaseInitializer&lt;DataContext&gt; { Public void InitializeDatabase(DataContext context) { // this generates the SQL script from my POCO Classes var sql = context.ObjectContext.CreateDatabaseScript(); // As expected - when run the second time it bombs out here with "there is already an // object named xxxxx in the database" context.ObjectContext.ExecuteStoreCommand(sql); this.seed(context) context.SaveChanges(); } } </code></pre> <p>Questions:</p> <p>Does anyone know how I can get/create the model hash? (which is an EdmMetadata Entity)</p> <p>-Or-</p> <p>Is there a better way of doing this in general using the Code First CTP?</p>
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    1. COTake a look at my PopulateOnly Initializer for AppHarbor and similar.
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