Groups > comp.lang.java.programmer > #25796

Re: Changes in DB Value not Reflected in Output

Date	2011-02-02 13:40 -0800
From	Patricia Shanahan <pats@acm.org>
Newsgroups	comp.lang.java.programmer
Subject	Re: Changes in DB Value not Reflected in Output
References	<81636edc-d51b-44a9-a3ef-2150fb65f8db@u11g2000prk.googlegroups.com> <ii28hr$gj6$1@news.eternal-september.org> <0f1fa97c-d5ae-46fd-96ab-aa6b7c36e995@r16g2000yql.googlegroups.com>
Message-ID	<59CdnQ5Iuuv6UtTQnZ2dnUVZ_o6dnZ2d@earthlink.com> (permalink)

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On 2/1/2011 2:47 PM, John Smith wrote:
...
> 	The obvious answer here is to "change the code such that
> curve.setGeneratorParameters() will be run"; however I have seen this
> same code being able
> 	to print "N" (=false) and "N" (=false) in the GUI.  When print to the
> file the logic goes thorough the same code snippet, reading the same
> value in the DB.
> 	Why is "0" (=true) and "0" (=true") printed in the report file?

I think you are asking the wrong question. Once you have more than one
thread accessing data, the default is that there is at least some
possibility of unreliable out-of-date data in one or more threads. There
are several ways of ensuring solidly consistent data sharing, but it is
unlikely to happen by accident.

My question is "What aspects of the design of your program ensure that
the thread doing the printing will always see the results of GUI changes
to the fields in question?"

I'm going to reiterate the advice to work on an SSCCE. Stripping down
your code, removing everything you *think* is irrelevant to the problem,
may well show what is wrong. If it does not, you will end up with
something you can post and get more informed advice.

Patricia

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Thread

Changes in DB Value not Reflected in Output John Smith <wleung7@gmail.com> - 2011-01-29 11:15 -0800
  Re: Changes in DB Value not Reflected in Output Patricia Shanahan <pats@acm.org> - 2011-02-02 13:40 -0800
  Re: Changes in DB Value not Reflected in Output John Smith <wleung7@gmail.com> - 2011-02-01 14:47 -0800
  Re: Changes in DB Value not Reflected in Output Joshua Cranmer <Pidgeot18@verizon.invalid> - 2011-01-29 18:40 -0500
  Re: Changes in DB Value not Reflected in Output Arne Vajhøj <arne@vajhoej.dk> - 2011-01-29 17:11 -0500

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