public String getSinlgeEntry(String userName)
{
    Cursor cursor=db.query("LOGIN", null, "USERNAME=?", new String[]{userName}, null, null, null);
    int data;
    data = cursor.getCount();
    if(cursor.getCount()<1) // UserName Not Exist
    {
        cursor.close();
        return "NOT EXIST";
    }
    cursor.moveToFirst();
    String password= cursor.getString(cursor.getColumnIndex("PASSWORD"));
    name = cursor.getString(cursor.getColumnIndex("NOMBRE"));
    correo = cursor.getString(cursor.getColumnIndex("CORREO"));
    cursor.close();
    return password;
}