public int count()
    {
        int count = 0;
        try
        {
            ResultSet set = read("SELECT COUNT(ID) AS COUNT FROM OPERATION");
            while(set.next())
            {
                count = set.getInt("COUNT");
            }
            set.close();
        }
        catch(SQLException e)
        {
            System.out.println("SQL Fehler");
        }
        return count;
    }