void revokeUserRole(User user, String role) {
    SQLiteDatabase db = this.getWritableDatabase();

    int role_id = 0;

    String selectQuery =
        "SELECT "
            + KEY_ROLE_ID
            + " FROM "
            + TABLE_ROLES
            + " WHERE "
            + KEY_ROLE
            + " = '"
            + role
            + "'";

    Cursor cursor = db.rawQuery(selectQuery, null);

    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {
      role_id = Integer.parseInt(cursor.getString(0));
    }

    if (role_id > 0) {
      // Delete Row
      db.delete(
          TABLE_USER_ROLES,
          KEY_USER_ID + " = ? AND " + KEY_ROLE_ID + " = ?",
          new String[] {String.valueOf(user.getUserId()), String.valueOf(role_id)});
    }

    db.close();
  }
  void addUserRole(User user, String role) {
    SQLiteDatabase db = this.getWritableDatabase();

    int role_id = 0;

    String selectQuery =
        "SELECT "
            + KEY_ROLE_ID
            + " FROM "
            + TABLE_ROLES
            + " WHERE "
            + KEY_ROLE
            + " = '"
            + role
            + "'";

    Cursor cursor = db.rawQuery(selectQuery, null);

    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {
      role_id = Integer.parseInt(cursor.getString(0));
    }

    ContentValues values = new ContentValues();
    values.put(KEY_USER_ID, user.getUserId());
    values.put(KEY_ROLE_ID, role_id);

    // Insert Row
    db.insert(TABLE_USER_ROLES, null, values);
    db.close();
  }
  public void logout(String token) {

    String selectQuery =
        "SELECT * FROM " + TABLE_USER + " WHERE " + KEY_TOKEN + " = '" + token + "'";

    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);

    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {

      User user = new User();
      user.setUserId(Integer.parseInt(cursor.getString(0)));

      ContentValues values = new ContentValues();
      values.put(KEY_TOKEN, "");

      // updating row
      db.update(
          TABLE_USER,
          values,
          KEY_USER_ID + " = ?",
          new String[] {String.valueOf(user.getUserId())});
    }
    cursor.close();
  }
  public int updateUser(User user) {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues values = new ContentValues();
    values.put(KEY_PASSWORD, user.getPassword());
    values.put(KEY_TOKEN, user.getToken());
    values.put(KEY_USER_ID, user.getUserId());
    values.put(KEY_USERNAME, user.getUsername());
    values.put(KEY_DATE_CREATED, user.getDateCreated());
    values.put(KEY_FIRST_NAME, user.getFirstName());
    values.put(KEY_LAST_NAME, user.getLastName());
    values.put(KEY_GENDER, user.getGender());
    values.put(KEY_USER_STATUS, user.getStatus());

    // updating row
    return db.update(
        TABLE_USER, values, KEY_USER_ID + " = ?", new String[] {String.valueOf(user.getUserId())});
  }
 public void deleteUser(User user) {
   SQLiteDatabase db = this.getWritableDatabase();
   db.delete(TABLE_USER, KEY_USER_ID + " = ?", new String[] {String.valueOf(user.getUserId())});
   db.close();
 }
  /** All CRUD(Create, Read, Update, Delete) Operations */
  public String login(String username, String password) {
    AeSimpleSHA1 sha = new AeSimpleSHA1();
    String passHash = "";

    try {
      passHash = sha.SHA1(password);
    } catch (NoSuchAlgorithmException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

    String selectQuery =
        "SELECT * FROM "
            + TABLE_USER
            + " WHERE "
            + KEY_USERNAME
            + " = '"
            + username
            + "' AND "
            + KEY_PASSWORD
            + " = '"
            + passHash
            + "'";

    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);

    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {

      char[] chars = "abcdefghijklmnopqrstuvwxyz0123456789".toCharArray();
      StringBuilder sb = new StringBuilder();

      Random random = new Random();
      for (int i = 0; i < 20; i++) {
        char c = chars[random.nextInt(chars.length)];
        sb.append(c);
      }
      String output = sb.toString();

      User user = new User();
      user.setUserId(Integer.parseInt(cursor.getString(0)));

      ContentValues values = new ContentValues();
      values.put(KEY_TOKEN, output);

      // updating row
      db.update(
          TABLE_USER,
          values,
          KEY_USER_ID + " = ?",
          new String[] {String.valueOf(user.getUserId())});

      mCurrentUserId = user.getUserId();

      cursor.close();

      return output;
    } else {
      cursor.close();

      return "";
    }
  }