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Re: Not closing a SQL(ite3) connection

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On 8/11/2017 4:26 AM, Cecil Westerhof wrote:
> I have a strange problem. I made a class SQLite3ResultSet. There is a
> lot of stuff to be removed, but that is just to find out if it is
> doing what I think it is doing.

> And the close method is (for now, because I want to test it):
>      @Override
>      public void close() throws SQLite3Exception {
>          System.out.println("SQLite3ResultSet: closing open resources.");
>          String    errorMsg  = "";
> 
>          try {
>              stmt.close();
>              resultSet.next();
>              resultSet.close();

resultSet.close();
stmt.close();

was rather obvious.

:-)

>          } catch (SQLException e) {
>              errorMsg += "Could not close ResultSet.\n";
>              System.out.println(errorMsg);
>          }
>          System.out.println("Closed resultSet.");
>          try {
>              stmt.close();
>          } catch (SQLException e) {
>              errorMsg += "Could not close Statement belonging to ResultSet.\n";
>              System.out.println(errorMsg);
>          }
>          System.out.println("closed stmt");
>          System.out.println("SQLite3ResultSet: closed open resources.");
>          if (!errorMsg.isEmpty()) {
>              throw new SQLite3Exception(errorMsg);
>          }
>      }
> 
> In the first try I close the stmt and then I do a resultSet.next(). I
> would expect an exception, because I closed the stmt, but I do not get
> an exception. Why not?

There is nothing in documentation for next() requiring an exception to
be thrown (ResultSet is not closed and it may not get a database error -
maybe it does not even talk to the database).

Weird code can give weird outcome, because the author of the
code may never have considered the case.

Arne

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Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-09 11:28 +0200
  Re: Not closing a SQL(ite3) connection Arne Vajhøj <arne@vajhoej.dk> - 2017-08-09 18:00 -0400
    Re: Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-11 10:26 +0200
      Re: Not closing a SQL(ite3) connection Arne Vajhøj <arne@vajhoej.dk> - 2017-08-11 20:27 -0400
        Re: Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-12 10:00 +0200
          Re: Not closing a SQL(ite3) connection Andreas Leitgeb <avl@logic.at> - 2017-08-12 08:51 +0000
            Re: Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-12 11:05 +0200
          Re: Not closing a SQL(ite3) connection Arne Vajhøj <arne@vajhoej.dk> - 2017-08-12 09:52 -0400
            Re: Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-12 16:26 +0200
              Re: Not closing a SQL(ite3) connection Arne Vajhøj <arne@vajhoej.dk> - 2017-08-12 21:43 -0400
                Re: Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 08:19 +0200
          Re: Not closing a SQL(ite3) connection lewbloch@gmail.com - 2017-08-12 10:14 -0700
        Re: Not closing a SQL(ite3) connection Andreas Leitgeb <avl@logic.at> - 2017-08-12 09:33 +0000
          Re: Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-12 12:57 +0200
            Re: Not closing a SQL(ite3) connection Andreas Leitgeb <avl@logic.at> - 2017-08-12 13:27 +0000
              Re: Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-12 16:37 +0200
            Re: Not closing a SQL(ite3) connection Arne Vajhøj <arne@vajhoej.dk> - 2017-08-12 09:55 -0400
              Re: Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-12 16:44 +0200
                Re: Not closing a SQL(ite3) connection Arne Vajhøj <arne@vajhoej.dk> - 2017-08-12 21:45 -0400
            Re: Not closing a SQL(ite3) connection Martin Gregorie <martin@address-in-sig.invalid> - 2017-08-12 21:04 +0000
              Re: Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 00:30 +0200
                Re: Not closing a SQL(ite3) connection Martin Gregorie <martin@address-in-sig.invalid> - 2017-08-13 11:34 +0000
                Re: Not closing a SQL(ite3) connection Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 15:27 +0200
          Re: Not closing a SQL(ite3) connection Andreas Leitgeb <avl@logic.at> - 2017-08-12 13:06 +0000

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