Entity Framework: Using transactions and rollbacks… Possible?

Question

Issue: (With Sql 2005)

• How can I query the database while the transaction is up? (Since it locks the table)
• How can cause a t

Answer 1

In my case I delete all records from a Table through plain SQL since EF doesn't provide a functionality for this. After that I add some new entities - but when it fails, the table shouldn't be empty. The use of MSDTC (TransactionScope) seems not possible for me. I reduced the transaction to the DB:

My code:

using (var transaction = context.Connection.BeginTransaction())
{
      // delete all
      base.DeleteAll(context);

      // add all
      foreach (var item in items)
      {
           context.TESTEntity.AddObject(item);
      }

      try
      {
           context.SaveChanges();
           transaction.Commit();
           return true;
      }
      catch (Exception ex)
      {
           Logger.Write("Error in Save: " + ex, "Error");
           transaction.Rollback();
           return false;
      }
}

And here the helper functions

    protected void DeleteAll(ObjectContext context) where TEntity : class
    {
        string tableName = GetTableName(context);
        int rc = context.ExecuteStoreCommand(string.Format(CultureInfo.InvariantCulture, "DELETE FROM {0}", tableName));
    }

    protected string GetTableName(ObjectContext context) where TEntity : class
    {
        string snippet = "FROM [dbo].[";

        string sql = context.CreateObjectSet().ToTraceString();
        string sqlFirstPart = sql.Substring(sql.IndexOf(snippet) + snippet.Length);
        string tableName = sqlFirstPart.Substring(0, sqlFirstPart.IndexOf("]"));
        return tableName;
    }