使用所有备份集通过SMO还原数据库

Question

My problem is really simple. I have a .bak file that contains one or more backup set.

When I'm using SMO to restore the database with this .bak file, it only takes the first backup set to do its work. It seems to ignore the remaining sets.

Why's that ?

See my code :

            //Sets the restore configuration
            Restore restore = new Restore()
            {
                Action = RestoreActionType.Database,
                Database = _databaseToRestore.DatabaseName,
                ReplaceDatabase = true
            };

            restore.Devices.Add(new BackupDeviceItem(_backupFilePath, DeviceType.File));

            Server server = new Server(_databaseToRestore.ServerName);

            DataTable fileList = restore.ReadFileList(server);
            string serverDataFolder = server.Settings.DefaultFile;

            if (string.IsNullOrEmpty(serverDataFolder))
                serverDataFolder = server.Information.MasterDBPath;

            foreach (DataRow file in fileList.Rows)
            {
                restore.RelocateFiles.Add(
                    new RelocateFile((string)file["LogicalName"],
                    Path.Combine(serverDataFolder, _databaseToRestore.DatabaseName + Path.GetExtension((string)file["PhysicalName"]))));
            }

            //Gets the exclusive access to database
            server.KillAllProcesses(_databaseToRestore.DatabaseName);
            restore.Wait();

            restore.SqlRestore(server);

I thought the BackupDeviceItem could gives me a feedback on how many backup sets there's inside, this way I could warn the user, but it's not.

Anyone has a clue on this ?

Thanks for your time.

Answer 1

Ok, fixed my problem.

The important field is FileNumber on the Restore object. The default value is 1, so that's why it always took my first backup set.

I just had to set this property to the number of backup sets in the file and now it takes the most recent backup done.

Note : No differencial backups are implicated in this concern.

Answer 2

I just found out that I could easily know how many backup sets the file contains.

DataTable backupSets = restore.ReadBackupHeader(server);

Now, a simple backupSets.Rows.Count can help me to warn the user.