From SQL to CSV

sqlToCSV.java

public void sqlToCSV (ResultSet rs, String filename) {
    try {
        FileWriter fw = new FileWriter(filename + ".csv");
        int cols = rs.getMetaData().getColumnCount();
        for(int i = 1; i <= cols; i ++){
            fw.append(rs.getMetaData().getColumnLabel(i));
            if(i < cols) fw.append(',');
            else fw.append('\n');
        }
        while (rs.next()) {
            for(int i = 1; i <= cols; i ++){
                fw.append(rs.getString(i));
                if(i < cols) fw.append(',');
                }
            fw.append('\n');
        }
        fw.flush();
        fw.close();
    } catch (Exception e) {
        getEngine().pause();
        traceln("--> An Exception happened during initialization, continue? ...");
        e.printStackTrace();
    }
}