Dumping SQLite table into CSV file in Android Studio

I need to dump all the contents from a table into a csv file. I googled a bit and scoured SO to find an answer but I can't seem to find what I'm looking for exactly, here's what I found : Android - Generate CSV file from table values and http://ift.tt/1uJRbZn. Here's my DB :

public class DBhelper extends SQLiteOpenHelper {

//TABLE COLUMNS
private static final String[] COLUMNS = {DBhelper.ID, DBhelper.GIFTCARDS_NUMBER, DBhelper.GIFTCARDS_CREATED,
        DBhelper.GIFTCARDS_CREATOR, DBhelper.GIFTCARDS_BALANCE};
private static final String ID = "_id";
private static final String GIFTCARDS_NUMBER = "number";
private static final String GIFTCARDS_CREATED = "created";
private static final String GIFTCARDS_CREATOR = "creator";
private static final String GIFTCARDS_BALANCE = "balance";

//DATABASE INFORMATION
static final String DB_NAME = "GiftcardsDB";

//DATABSE VERSION
static final int DB_VERSION = 1;

// TABLE QUERY
private static final String CREATE_TABLE = "CREATE TABLE giftcards ( " + ID +
        " INTEGER PRIMARY KEY AUTOINCREMENT, " + GIFTCARDS_NUMBER + " TEXT NOT NULL, " + GIFTCARDS_CREATED +
        " TEXT NOT NULL, " + GIFTCARDS_CREATOR + " INTEGER NOT NULL, " + GIFTCARDS_BALANCE + " REAL);";

public DBhelper(Context context) {
    super(context, DB_NAME, null, DB_VERSION);

}

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL(CREATE_TABLE);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("DROP TABLE IF EXISTS Giftcards");
    onCreate(db);
}       

I'd like some explanation on how does CSVWriter and/or ResultSet works. Thanks in advance !