// <summary>
// Calculates an SHA256 hash of the EDMX from the given code first model. This is the hash stored in
// the database in the EdmMetadata table in EF 4.1/4.2. The hash is always calculated using a v2 schema
// as was generated by EF 4.1/4.2 and with the <see cref="EdmMetadata" /> entity included in the model.
// </summary>
public virtual string Calculate(DbCompiledModel compiledModel)
{
DebugCheck.NotNull(compiledModel);
DebugCheck.NotNull(compiledModel.ProviderInfo);
DebugCheck.NotNull(compiledModel.CachedModelBuilder);
var providerInfo = compiledModel.ProviderInfo;
var modelBuilder = compiledModel.CachedModelBuilder.Clone();
// Add back in the EdmMetadata class because the hash created by EF 4.1 and 4.2 will contain it.
EdmMetadataContext.ConfigureEdmMetadata(modelBuilder.ModelConfiguration);
var databaseMetadata = modelBuilder.Build(providerInfo).DatabaseMapping.Database;
databaseMetadata.SchemaVersion = XmlConstants.StoreVersionForV2; // Ensures SSDL version matches that created by EF 4.1/4.2
var stringBuilder = new StringBuilder();
using (var xmlWriter = XmlWriter.Create(
stringBuilder, new XmlWriterSettings
{
Indent = true
}))
{
new SsdlSerializer().Serialize(
databaseMetadata,
providerInfo.ProviderInvariantName,
providerInfo.ProviderManifestToken,
xmlWriter);
}
return(ComputeSha256Hash(stringBuilder.ToString()));
}
public virtual string QueryForModelHash(
Func <DbConnection, EdmMetadataContext> createContext)
{
DbConnection connection = this.CreateConnection();
try
{
using (EdmMetadataContext edmMetadataContext = createContext(connection))
{
if (this._existingTransaction != null)
{
if (this._existingTransaction.Connection == connection)
{
edmMetadataContext.Database.UseTransaction(this._existingTransaction);
}
}
try
{
return(edmMetadataContext.Metadata.AsNoTracking <EdmMetadata>().OrderByDescending <EdmMetadata, int>((Expression <Func <EdmMetadata, int> >)(m => m.Id)).FirstOrDefault <EdmMetadata>()?.ModelHash);
}
catch (EntityCommandExecutionException ex)
{
return((string)null);
}
}
}
finally
{
this.DisposeConnection(connection);
}
}
private static void DropMigrationHistoryAndAddEdmMetadata(DbConnection connection, string hash)
{
using (var poker = new EdmMetadataContext(connection, contextOwnsConnection: false))
{
poker.Database.ExecuteSqlCommand("drop table " + HistoryContext.TableName);
poker.Database.ExecuteSqlCommand(
((IObjectContextAdapter)poker).ObjectContext.CreateDatabaseScript());
#pragma warning disable 612,618
poker.Metadata.Add(
new EdmMetadata
{
ModelHash = hash
});
#pragma warning restore 612,618
poker.SaveChanges();
}
}
public virtual string Calculate(DbCompiledModel compiledModel)
{
DbProviderInfo providerInfo = compiledModel.ProviderInfo;
DbModelBuilder dbModelBuilder = compiledModel.CachedModelBuilder.Clone();
EdmMetadataContext.ConfigureEdmMetadata(dbModelBuilder.ModelConfiguration);
EdmModel database = dbModelBuilder.Build(providerInfo).DatabaseMapping.Database;
database.SchemaVersion = 2.0;
StringBuilder stringBuilder = new StringBuilder();
StringBuilder output = stringBuilder;
XmlWriterSettings settings = new XmlWriterSettings()
{
Indent = true
};
using (XmlWriter xmlWriter = XmlWriter.Create(output, settings))
new SsdlSerializer().Serialize(database, providerInfo.ProviderInvariantName, providerInfo.ProviderManifestToken, xmlWriter, true);
return(ModelHashCalculator.ComputeSha256Hash(stringBuilder.ToString()));
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
EdmMetadataContext.ConfigureEdmMetadata(modelBuilder.ModelConfiguration);
}
