public String searchAll (ArrayList<String> names, ArrayList<String> Email, ArrayList<String> Password)
{

    db = this.getWritableDatabase();
    Cursor cursor = db.query("contacts",null,null,null,null,null,null);
    if (cursor.moveToFirst())
    {
        int idColIndex = cursor.getColumnIndex("id");
        int nameColIndex = cursor.getColumnIndex("name");
        int emailColIndex = cursor.getColumnIndex("email");
        int passwordColIndex = cursor.getColumnIndex("password");
        do {
            names.add(cursor.getString(nameColIndex));
            Email.add(cursor.getString(emailColIndex));
            Password.add(cursor.getString(passwordColIndex));
        } while (cursor.moveToNext());

    }
   cursor.close();

    db.close();

}

SQLiteDatabase db = oh.getReadableDatabase();

    Cursor cursor = db.query("data", new String[] { oh.KEY_ID,
                    oh.KEY_METRIC, oh.KEY_ROOL },null,
            null, null, null, null, null);
    if (cursor != null)
        cursor.moveToFirst();

    while (cursor!=null){

        try {
            data.add(cursor.getString(2));
            cursor.moveToNext();
        }catch (Exception e){
            break;
        }
    }