Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.java.programmer > #37316
| From | Andreas Leitgeb <avl@logic.at> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: Testing the functionality of sub classes |
| Date | 2017-08-20 14:33 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <slrnopj7la.o2q.avl@logic.at> (permalink) |
| References | (4 earlier) <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> |
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
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