Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #37246

Re: Which databases are the most used with Java

Show key headers only | View raw

Patrick Roemer <sangamon@netcologne.de> writes:

> Responding to Cecil Westerhof:
>> Patrick Roemer <sangamon@netcologne.de> writes:
>> 
>>> Responding to Cecil Westerhof:
>>>> Earlier I was told that the way to do things was something like:
>>>>     try (Statement stmtOldest = conn.createStatement();
>>>>          ResultSet rsOldest   = stmtOldest.executeQuery(OLDEST_USED)
>>>>          Statement stmtNewest = conn.createStatement();
>>>>          ResultSet rsNewest   = stmtNewest.executeQuery(OLDEST_USED)
>>>>          Statement stmtCount  = conn.createStatement();
>>>>          ResultSet rsCount    = stmtCount.executeQuery(OLDEST_USED)) {
>>>
>>> Sure about that? I haven't seen any such suggestion in recent threads.
>>> To the contrary, more than once you have been advised to reuse one
>>> statement to create multiple result sets in sequence.
>> 
>> Yes I am sure about that. But probably another thread.
>
> I am sure I haven't seen it *in recent threads*. I'd love to see a
> pointer to that post.

I have been a ‘little’ into discussions. So I have to look it up.


>>> You seem to insist on Statement being an evil ploy designed by the JDBC
>>> inventors to force you to write unnecessary boiler plate code when all
>>> you want is just a ResultSet. Whatever follows from this line of
>>> reasoning is not likely to be correct or useful, I'm afraid.
>> 
>> I do not see Statement as an evil ploy. But I think that with try with
>> resources it is something you do not need explicit anymore.
>
> This just doesn't make sense. try-with-resources is just syntactic
> sugar for a try-catch-finally pattern, the semantics are unaffected.
>
> In situations where you really only want a one-shot ResultSet, something
> like your custom helper #executeQuery() method /may/ make sense. But
> that would be just as useful or useless as with the "classic"
> try-catch-finally pattern.
>
> In almost all other cases, e.g. when sequencing a number of ResultSets,
> one should go for reuse of a single, explicit Statement. If only because
> bluntly creating one statement per ResultSet may be harmful for
> performance - one cannot know how costly creation and teardown of a
> Statement is going to be. And again, try-with-resources or try-catch
> finally doesn't have any impact on this consideration.

It of-course depends. I have written programs where I used (a
‘global’) Statement several times, but especially in short lived
desktop applications it is different.

It all started with a certain point where I needed three ResultSets.
Because a Statement can only have one concurrent ResultSet I needed
also three Statements. I did not like that. And that is where it all
started with.

The funny thing is that I do not need the three ResultSets anymore,
because while creating the wrapper I also created a function to get a
count. And this was where I needed the ResultSets for.


-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

Back to comp.lang.java.programmer | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 07:58 +0200
  Re: Which databases are the most used with Java Marcel Mueller <news.5.maazl@spamgourmet.org> - 2017-08-13 09:33 +0200
    Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 11:14 +0200
    Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 16:53 -0400
  Re: Which databases are the most used with Java Sebastian <nowhere@nirvana.org> - 2017-08-13 09:36 +0200
    Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 11:07 +0200
      Re: Which databases are the most used with Java Andreas Leitgeb <avl@logic.at> - 2017-08-13 09:46 +0000
        Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 12:12 +0200
          Re: Which databases are the most used with Java Robert Klemme <shortcutter@googlemail.com> - 2017-08-13 17:47 +0200
            Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 19:11 +0200
              Re: Which databases are the most used with Java Robert Klemme <shortcutter@googlemail.com> - 2017-08-13 20:26 +0200
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 21:30 +0200
                Re: Which databases are the most used with Java Martin Gregorie <martin@address-in-sig.invalid> - 2017-08-13 20:00 +0000
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 16:43 -0400
              Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 16:42 -0400
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 23:18 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 20:41 -0400
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-14 03:04 +0200
                Re: Which databases are the most used with Java lewbloch@gmail.com - 2017-08-14 11:12 -0700
                Re: Which databases are the most used with Java Eric Douglas <e.d.programmer@gmail.com> - 2017-08-14 12:42 -0700
                Re: Which databases are the most used with Java Robert Klemme <shortcutter@googlemail.com> - 2017-08-21 22:25 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-21 19:50 -0400
              Re: Which databases are the most used with Java Eric Douglas <e.d.programmer@gmail.com> - 2017-08-14 13:48 -0700
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 07:27 +0200
                Re: Which databases are the most used with Java Martin Gregorie <martin@address-in-sig.invalid> - 2017-08-15 10:25 +0000
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 14:15 +0200
                Re: Which databases are the most used with Java Martin Gregorie <martin@address-in-sig.invalid> - 2017-08-15 14:37 +0000
                Re: Which databases are the most used with Java lewbloch@gmail.com - 2017-08-17 14:52 -0700
                Re: Which databases are the most used with Java Sebastian <nowhere@nirvana.org> - 2017-08-18 00:09 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-17 18:14 -0400
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-17 18:19 -0400
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-18 06:43 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-15 11:02 -0400
                Re: Which databases are the most used with Java Patrick Roemer <sangamon@netcologne.de> - 2017-08-15 13:12 +0200
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 14:41 +0200
                Re: Which databases are the most used with Java Eric Douglas <e.d.programmer@gmail.com> - 2017-08-15 06:11 -0700
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 16:33 +0200
                Re: Which databases are the most used with Java Eric Douglas <e.d.programmer@gmail.com> - 2017-08-15 08:05 -0700
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 18:48 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-15 11:12 -0400
                Re: Which databases are the most used with Java Eric Douglas <e.d.programmer@gmail.com> - 2017-08-15 08:19 -0700
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-15 11:46 -0400
                Re: Which databases are the most used with Java Eric Douglas <e.d.programmer@gmail.com> - 2017-08-15 08:43 -0700
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-15 11:51 -0400
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 18:38 +0200
                Re: Which databases are the most used with Java Patrick Roemer <sangamon@netcologne.de> - 2017-08-15 16:14 +0200
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 17:42 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-15 11:09 -0400
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-15 11:06 -0400
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 18:42 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-16 21:13 -0400
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-17 09:04 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-17 18:16 -0400
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-18 06:51 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-18 08:52 -0400
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-18 15:31 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-18 15:09 -0400
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-18 23:14 +0200
                Re: Which databases are the most used with Java Eric Douglas <e.d.programmer@gmail.com> - 2017-08-18 07:15 -0700
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-18 15:16 -0400
      Re: Which databases are the most used with Java Sebastian <nowhere@nirvana.org> - 2017-08-13 18:08 +0200
        Re: Which databases are the most used with Java Robert Klemme <shortcutter@googlemail.com> - 2017-08-13 20:30 +0200
          Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 21:35 +0200
            Re: Which databases are the most used with Java Sebastian <nowhere@nirvana.org> - 2017-08-13 22:24 +0200
              Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 23:33 +0200
                Re: Which databases are the most used with Java Robert Klemme <shortcutter@googlemail.com> - 2017-08-14 18:18 +0200
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 07:47 +0200
              Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-16 21:21 -0400
                Re: Which databases are the most used with Java Sebastian <nowhere@nirvana.org> - 2017-08-17 23:33 +0200
                Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-17 18:11 -0400
            Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 23:24 +0200
              Re: Which databases are the most used with Java Robert Klemme <shortcutter@googlemail.com> - 2017-08-14 18:14 +0200
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-15 07:45 +0200
          Re: Which databases are the most used with Java Sebastian <nowhere@nirvana.org> - 2017-08-13 22:16 +0200
          Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 16:50 -0400
            Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 23:35 +0200
              Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 21:14 -0400
                Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-14 10:24 +0200
        Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 16:45 -0400
          Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-13 23:36 +0200
            Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 20:42 -0400
              Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-14 03:06 +0200
      Re: Which databases are the most used with Java lewbloch@gmail.com - 2017-08-13 09:59 -0700
      Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 17:04 -0400
        Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-14 00:06 +0200
          Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-14 00:35 +0200
            Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 20:44 -0400
              Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-14 03:12 +0200
  Re: Which databases are the most used with Java Arne Vajhøj <arne@vajhoej.dk> - 2017-08-13 16:59 -0400
  Re: Which databases are the most used with Java Joerg Meier <joergmmeier@arcor.de> - 2017-08-16 07:26 +0200
    Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-16 09:40 +0200
  Re: Which databases are the most used with Java Graeme Geldenhuys <graemeg@example.net> - 2017-08-23 00:15 +0100
    Re: Which databases are the most used with Java Cecil Westerhof <Cecil@decebal.nl> - 2017-08-23 12:09 +0200

csiph-web