Someone

public void Append(string param, int value) {
		command.Parameters.Add(new Npgsql.NpgsqlParameter(param, System.Data.DbType.Int32, 4));
		command.Parameters[param].Value = value;
	}

public void Append(string param, long value) {
		command.Parameters.Add(new Npgsql.NpgsqlParameter(param, System.Data.DbType.Int64, 8));
		command.Parameters[param].Value = value;
	}