سوال راجب به DBAdapter (بچه ها اینجا هم یه نگاه کنید ممنون )

سلام ممنونم که وقت گذاشتید و سوال من را میخوانید.

من کدی را در زیر قرار میدم که 2 تا جدول داره ولی اطلاعات ستون ها یکی هست ، حالا سوال من اینجاست که اگر ستون ها یکی نباشه واسه متدی مثل insertContact یا deleteCotact ایا نیاز به نوشتن متدی جداست یا نه؟؟ اگر جواب مثب هست چطور؟؟

 public class DBAdapter {
    static final String KEY_ROWID = "_id";
    static final String KEY_NAME = "name";
    static final String KEY_EMAIL = "email";
    static final String TAG = "DBAdapter";

    static final String DATABASE_NAME = "MyDB";
    static final String DATABASE_MAINTABLE = "contacts";
    static final String DATABASE_FAVTABLE = "favs";
    static final int DATABASE_VERSION = 2;

    static final String CREATE_MAINTABLE =
            "create table " + DATABASE_MAINTABLE  +"("+KEY_ROWID+ " integer primary key autoincrement, "
            + KEY_NAME+ " text not null,"+ KEY_EMAIL+" text not null);";
    static final String CREATE_FAVTABALE =
            "create table " + DATABASE_FAVTABLE  +"("+KEY_ROWID+ " integer primary key autoincrement, "
            + KEY_NAME+ " text not null,"+ KEY_EMAIL+" text not null);";

    final Context context;

    DatabaseHelper DBHelper;
    SQLiteDatabase db;
    
    public DBAdapter(Context ctx)
    {
        this.context = ctx;
        DBHelper = new DatabaseHelper(context);
    }

    private static class DatabaseHelper extends SQLiteOpenHelper
    {
        DatabaseHelper(Context context)
        {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);
        }

        @Override
        public void onCreate(SQLiteDatabase db)
        {
            try {
                db.execSQL(CREATE_MAINTABLE);
                db.execSQL(CREATE_FAVTABALE);
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
        {
        	 Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
                    + newVersion + ", which will destroy all old data");
           
            db.execSQL("DROP TABLE IF EXISTS "+DATABASE_MAINTABLE);            
            db.execSQL("DROP TABLE IF EXISTS "+DATABASE_FAVTABLE);
            onCreate(db);          
        }
    }

    //---opens the database---
    public DBAdapter open() throws SQLException 
    {
        db = DBHelper.getWritableDatabase();
        return this;
    }

    //---closes the database---
    public void close() 
    {
        DBHelper.close();
    }

    //---insert a contact into the database---
    public long insertContact(String name, String email,String tabale) 
    {
        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_NAME, name);
        initialValues.put(KEY_EMAIL, email);
        return db.insert(tabale, null, initialValues);
    }

    //---deletes a particular contact---
    public boolean deleteContact(String mail,String tabale) 
    {
    	return db.delete(tabale, KEY_EMAIL + " LIKE '" + mail + "'", null) > 0;
    }

    //---retrieves all the contacts---
    public  List<Mokhatab> getAllContacts(String tabale)
    {
    	
    	Cursor cursor = db.query(tabale, new String[] {KEY_ROWID, KEY_NAME,
                KEY_EMAIL}, null, null, null, null, null);	
        List<Mokhatab> mokhatabha = cursorToList(cursor);
        return mokhatabha;
 }
    //in method ro joda gune tarif kardim (ke cursor ro migire va mokhatab ha ro bar migardune)
    //chun niaz nabashe dakhele method haye dige in cod ha ro har bar copy konim va faghat sedash bezanim kafi bashe
    private List<Mokhatab> cursorToList(Cursor cursor) {
    	 List<Mokhatab> mokhatabha = new ArrayList<Mokhatab>();
         if (cursor.getCount() > 0)
         {
        	 while (cursor.moveToNext()) {
             	Mokhatab mokhatab = new Mokhatab();
             	mokhatab.setId(cursor.getString(0));
             	mokhatab.setname(cursor.getString(1));
             	mokhatab.setMail(cursor.getString(2));
             	mokhatabha.add(mokhatab);
        	 } ;
         }
         return mokhatabha;
	}

	//---retrieves a particular contact---
    public Cursor getContact(String mail,String tabale) throws SQLException 
    {
        Cursor mCursor =
                db.query(true, tabale, new String[] {KEY_ROWID,
                KEY_NAME, KEY_EMAIL}, KEY_EMAIL + " LIKE '" + mail + "'", null,
                null, null, null, null);
        if (mCursor != null) {
            mCursor.moveToFirst();
        }
        return mCursor;
    }

    ///search
    public List<Mokhatab> findContacts(String name,String tabale) throws SQLException 
    {
        Cursor cursor =
        		// % ha yani inke mohem nis ghabl ya badesh harchi mikhad bashe
                db.query(true, tabale, new String[] {KEY_ROWID,
                KEY_NAME, KEY_EMAIL}, KEY_NAME + " LIKE '%" + name + "%'", null,
                null, null, null, null);
        List<Mokhatab> mokhatabha = cursorToList(cursor);
        return mokhatabha;
    }
    
    
    
    
    
    //---updates a contact---
    public boolean updateContact(long rowId, String name, String email) 
    {
        ContentValues args = new ContentValues();
        args.put(KEY_NAME, name);
        args.put(KEY_EMAIL, email);
        return db.update(DATABASE_MAINTABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
    }

}

یه سوال دیگه، داخل این کد دیتابیس کجا ذخیره میشه؟ روی مموری یا روی حافظه داخلی؟؟