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

Groups > comp.lang.java.programmer > #37316

Re: Testing the functionality of sub classes

Path csiph.com!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From Andreas Leitgeb <avl@logic.at>
Newsgroups comp.lang.java.programmer
Subject Re: Testing the functionality of sub classes
Date Sun, 20 Aug 2017 14:33:13 -0000 (UTC)
Organization A noiseless patient Spider
Lines 35
Message-ID <slrnopj7la.o2q.avl@logic.at> (permalink)
References <87fucnh2wu.fsf@munus.decebal.nl> <subclasses-20170819193036@ram.dialup.fu-berlin.de> <87y3qffim5.fsf@munus.decebal.nl> <ona7tq$igi$1@dont-email.me> <87pobrf855.fsf@munus.decebal.nl> <slrnopiu4a.o2q.avl@logic.at> <87ziaue74o.fsf@munus.decebal.nl> <87valie4xz.fsf@munus.decebal.nl> <onc3s5$1ns5$1@gioia.aioe.org>
Reply-To avl@logic.at
Mime-Version 1.0
Content-Type text/plain; charset=UTF-8
Content-Transfer-Encoding 8bit
Injection-Date Sun, 20 Aug 2017 14:33:13 -0000 (UTC)
Injection-Info mx02.eternal-september.org; posting-host="cd31f327af7298cb41a335016b661fc8"; logging-data="19323"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/GJ0IK60mh89DlMdGiu1az"
User-Agent slrn/1.0.2 (Linux)
Cancel-Lock sha1:I98yzNaGz2fuUBzUEIHa1lw1wFY=
Xref csiph.com comp.lang.java.programmer:37316

Show key headers only | View raw

Arne Vajhøj <arne@vajhoej.dk> wrote:
> On 8/20/2017 9:36 AM, Cecil Westerhof wrote:
>> Cecil Westerhof <Cecil@decebal.nl> writes:
>>> Just to satisfy my curiosity I executed (I do not like the formatting,
>>> but that is what Eclipse does):
>>>      try (
>>>              Statement stmt = conn.createStatement();
>>>              ResultSet rsOne = stmt.executeQuery("SELECT 12 AS twelve");
>>>              ResultSet rsTwo = stmt.executeQuery("SELECT 'Hello World!' AS message")
>>>              ) {
>>>          System.out.println(stmt);
>>>          System.out.println(rsOne);
>>>          System.out.println(rsTwo);
>>>      }
>>>
>>> And this gives:
>>>      org.sqlite.jdbc4.JDBC4Statement@685f4c2e
>>>      org.sqlite.jdbc4.JDBC4ResultSet@7daf6ecc
>>>      org.sqlite.jdbc4.JDBC4ResultSet@7daf6ecc
>>>
>>> So yes, it is like you said: the ResultSet is reused. Is also more
>>> logical. I jumped to a conclusion.
>> 
>> With a H2 database I get:
>>      stat0
>>      rs0: null
>>      rs1: org.h2.result.LocalResult@1bc6a36e columns: 1 rows: 1 pos: -1
>
> That is what happens when you try and do unsupported things: you get
> undefined/implementation specific behavior. Bad!

In this particular case the "undefined/implementation specific behavior"
is ResultSet-implementation's toString().  That's why I suggested to use
System.identityHashCode().

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

Thread

Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-19 19:40 +0200
  Re: Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-19 21:44 +0200
    Re: Testing the functionality of sub classes Eric Sosman <esosman@comcast-dot-net.invalid> - 2017-08-19 16:47 -0400
      Re: Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-20 01:30 +0200
        Re: Testing the functionality of sub classes Andreas Leitgeb <avl@logic.at> - 2017-08-20 11:50 +0000
          Re: Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-20 14:49 +0200
            Re: Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-20 15:36 +0200
              Re: Testing the functionality of sub classes Arne Vajhøj <arne@vajhoej.dk> - 2017-08-20 09:46 -0400
                Re: Testing the functionality of sub classes Andreas Leitgeb <avl@logic.at> - 2017-08-20 14:33 +0000
                Re: Testing the functionality of sub classes Arne Vajhøj <arne@vajhoej.dk> - 2017-08-20 11:14 -0400
                Re: Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-20 16:35 +0200
                Re: Testing the functionality of sub classes Arne Vajhøj <arne@vajhoej.dk> - 2017-08-20 11:17 -0400
                Re: Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-20 18:13 +0200
                Re: Testing the functionality of sub classes Arne Vajhøj <arne@vajhoej.dk> - 2017-08-20 12:28 -0400
                Re: Testing the functionality of sub classes Arne Vajhøj <arne@vajhoej.dk> - 2017-08-20 13:06 -0400
                Re: Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-20 19:07 +0200
            Re: Testing the functionality of sub classes Arne Vajhøj <arne@vajhoej.dk> - 2017-08-20 11:21 -0400
              Re: Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-20 18:17 +0200
          Re: Testing the functionality of sub classes v_borchert@despammed.com (Volker Borchert) - 2017-08-21 19:53 +0000
    Re: Testing the functionality of sub classes v_borchert@despammed.com (Volker Borchert) - 2017-08-19 21:15 +0000
      Re: Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-20 01:36 +0200
    Re: Testing the functionality of sub classes Cecil Westerhof <Cecil@decebal.nl> - 2017-08-20 01:22 +0200

csiph-web