Entity Framework CTP 4 - Code First Custom Database Initializer

Question

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 supplie

Answer 1

Just to contribute to @Luhmann's solution, here's mine but slightly changed to drop the FK and PK properly.

using System.Data.Entity;
using System.Data.Entity.Design;
using System.Data.Entity.Infrastructure;
using System.Data.Metadata.Edm;
using System.Data.Objects;
using System.Globalization;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Xml;

namespace SISQuote.Server.Persistence
{
    public class DontDropExistingDbCreateTablesIfModelChanged : IDatabaseInitializer where T : DbContext
    {
        private EdmMetadata edmMetaData;

        public bool TryInitializeDatabase(T context)
        {
            ObjectContext objectContext = ((IObjectContextAdapter)context).ObjectContext;
            string modelHash = GetModelHash(objectContext);

            if (CompatibleWithModel(modelHash, context, objectContext))
                return false;

            DeleteExistingTables(objectContext);
            CreateTables(objectContext);
            SaveModelHashToDatabase(context, modelHash, objectContext);

            return true;
        }

        public void InitializeDatabase(T context)
        {
            TryInitializeDatabase(context);
        }

        private void SaveModelHashToDatabase(T context, string modelHash, ObjectContext objectContext)
        {
            if (edmMetaData != null) 
                objectContext.Detach(edmMetaData);

            edmMetaData = new EdmMetadata();
            context.Set().Add(edmMetaData);

            edmMetaData.ModelHash = modelHash;
            context.SaveChanges();
        }

        private void CreateTables(ObjectContext objectContext)
        {
            string dataBaseCreateScript = objectContext.CreateDatabaseScript();
            objectContext.ExecuteStoreCommand(dataBaseCreateScript);
        }

        private void DeleteExistingTables(ObjectContext objectContext)
        {
            objectContext.ExecuteStoreCommand(DeleteAllTablesScript);
        }

        private string GetModelHash(ObjectContext context)
        {
            var csdlXmlString = GetCsdlXmlString(context).ToString();
            return ComputeSha256Hash(csdlXmlString);
        }

        public bool CompatibleWithModel(DbContext context)
        {
            ObjectContext objectContext = ((IObjectContextAdapter)context).ObjectContext;
            return CompatibleWithModel(GetModelHash(objectContext), context, objectContext);
        }

        private bool CompatibleWithModel(string modelHash, DbContext context, ObjectContext objectContext)
        {
            var isEdmMetaDataInStore = objectContext.ExecuteStoreQuery(LookupEdmMetaDataTable).FirstOrDefault();
            if (isEdmMetaDataInStore == 1)
            {
                edmMetaData = context.Set().FirstOrDefault();
                if (edmMetaData != null)
                {
                    return modelHash == edmMetaData.ModelHash;
                }
            }
            return false;
        }

        private string GetCsdlXmlString(ObjectContext context)
        {
            if (context != null)
            {
                var entityContainerList = context.MetadataWorkspace.GetItems(DataSpace.SSpace);
                if (entityContainerList != null)
                {
                    EntityContainer entityContainer = entityContainerList.FirstOrDefault();
                    var generator = new EntityModelSchemaGenerator(entityContainer);
                    var stringBuilder = new StringBuilder();
                    var xmlWRiter = XmlWriter.Create(stringBuilder);
                    generator.GenerateMetadata();
                    generator.WriteModelSchema(xmlWRiter);
                    xmlWRiter.Flush();
                    return stringBuilder.ToString();
                }
            }
            return string.Empty;
        }

        private static string ComputeSha256Hash(string input)
        {
            byte[] buffer = new SHA256Managed().ComputeHash(Encoding.ASCII.GetBytes(input));
            var builder = new StringBuilder(buffer.Length * 2);
            foreach (byte num in buffer)
            {
                builder.Append(num.ToString("X2", CultureInfo.InvariantCulture));
            }
            return builder.ToString();
        }

        private const string DeleteAllTablesScript =
            @"declare @cmd varchar(4000)

              DECLARE cmds0 CURSOR FOR 
              SELECT 'ALTER TABLE ' + TABLE_NAME + ' DROP CONSTRAINT ' + CONSTRAINT_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE CONSTRAINT_TYPE = 'FOREIGN KEY'

              DECLARE cmds1 CURSOR FOR 
              SELECT 'ALTER TABLE ' + TABLE_NAME + ' DROP CONSTRAINT ' + CONSTRAINT_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS

              DECLARE cmds2 CURSOR FOR 
              SELECT 'TRUNCATE TABLE ' + TABLE_NAME FROM INFORMATION_SCHEMA.TABLES

              DECLARE cmds3 CURSOR FOR 
              SELECT 'DROP TABLE [' + TABLE_NAME + ']' FROM INFORMATION_SCHEMA.TABLES

              open cmds0
              while 1=1
              begin
                  fetch cmds0 into @cmd
                  if @@fetch_status != 0 break
                  print @cmd
                  exec(@cmd)
              end
              close cmds0
              deallocate cmds0

              open cmds1
              while 1=1
              begin
                  fetch cmds1 into @cmd
                  if @@fetch_status != 0 break
                  print @cmd
                  exec(@cmd)
              end
              close cmds1
              deallocate cmds1

              open cmds2
              while 1=1
              begin
                  fetch cmds2 into @cmd
                  if @@fetch_status != 0 break
                  print @cmd
                  exec(@cmd)
              end
              close cmds2
              deallocate cmds2

              open cmds3
              while 1=1
              begin
                  fetch cmds3 into @cmd
                  if @@fetch_status != 0 break
                  print @cmd
                  exec(@cmd)
              end
              close cmds3
              deallocate cmds3";

        private const string LookupEdmMetaDataTable =
            @"Select COUNT(*) 
              FROM INFORMATION_SCHEMA.TABLES T 
              Where T.TABLE_NAME = 'EdmMetaData'";
    }
}