.net 8.0 console application using System.Data.Odbc for converting absolute paths in pro.agzess.net's ARCHIV.MDB Bildatenbank to relative paths

agzess_archiv_bilddatenbank_converter.cs

// Small program for converting old absolute paths in the Bilddatenbank of ARCHIV.MDB for pro.agzess.net to relative paths
// USE WITH CARE AND CREATE A BACKUP OF ARCHIV.MDB BEFORE RUNNING THIS PROGRAM

using System.Data.Odbc;

using (OdbcConnection conn = new OdbcConnection())
{
    Console.WriteLine("Provide Path to ARCHIV.MDB.");
    Console.Write("Name: ");

    string input = Console.ReadLine();
    while (!File.Exists(input))
    {
        Console.WriteLine("ERR: File does not exist. Please try again.");
        Console.Write("Name: ");
        input = Console.ReadLine();
    }

    conn.ConnectionString =
        "Driver={Microsoft Access Driver (*.mdb, *.accdb)}; Dbq=" + input + ";";
    conn.Open();

    Console.Write("Reading BildIds... ");
    List<int> ids = new List<int>();
    using (OdbcCommand command = conn.CreateCommand())
    {
        command.CommandText = "SELECT BildId FROM Bilddatenbank";
        using (OdbcDataReader reader = command.ExecuteReader())
        {
            if (reader.FieldCount != 1 || !reader.GetName(0).Equals("BildId"))
            {
                throw new Exception("Invalid Result Header");
            }

            while (reader.Read())
            {
                ids.Add(reader.GetInt32(0));
            }

            reader.Close();
        }
    }

    Console.WriteLine(ids.Count);

    Console.WriteLine("Updating Paths...");
    foreach (int id in ids)
    {
        string oldName, newName;
        using (OdbcCommand command = conn.CreateCommand())
        {
            command.CommandText = "SELECT Dateiname FROM Bilddatenbank WHERE BildId = " + id;
            using (OdbcDataReader reader = command.ExecuteReader())
            {
                if (reader.FieldCount != 1 || !reader.GetName(0).Equals("Dateiname"))
                {
                    throw new Exception("Invalid Result Header");
                }

                if (!reader.Read())
                {
                    throw new Exception("Command has no rows to read.");
                }

                oldName = reader.GetString(0).Trim();

                if (reader.Read())
                {
                    throw new Exception("Command should only return one row.");
                }

                reader.Close();
            }
        }

        int index = oldName.IndexOf("\\AGZESS", StringComparison.OrdinalIgnoreCase);
        if (index > 0)
        {
            newName = oldName.Substring(index);
        }
        else
        {
            newName = oldName;
        }

        Console.Write(id + ": Updating from " + oldName + " to " + newName + "...");

        using (OdbcCommand command = conn.CreateCommand())
        {
            command.CommandText = "UPDATE Bilddatenbank SET Dateiname = '" + newName + "' WHERE BildId = " + id;
            using (OdbcDataReader reader = command.ExecuteReader())
            {
                if (reader.RecordsAffected != 1)
                {
                    throw new Exception("Updating " + id + " failed.");
                }

                reader.Close();
            }
        }

        Console.WriteLine("done");
    }

    conn.Close();
}