Groups > comp.lang.java.programmer > #32361

Re: JPA and extra fields

From	Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups	comp.lang.java.programmer
Subject	Re: JPA and extra fields
Date	2015-08-19 10:48 +0000
Organization	A noiseless patient Spider
Message-ID	<mr1mu5$c4n$1@dont-email.me> (permalink)
References	(3 earlier) <mqsh70$s82$1@dont-email.me> <mqufi0$605$1@dont-email.me> <mqv2ke$u6r$1@dont-email.me> <mr1cvb$e61$1@dont-email.me> <87r3mzr55r.fsf@Equus.decebal.nl>

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On Wed, 19 Aug 2015 11:36:32 +0200, Cecil Westerhof wrote:

> But the fields are never used in the
> application itself. They are only written into the database.
>
...which I strongly suspect they are a debugging aid and have been 
arguing that, if it makes more sense to maintain them separately from the 
application logic, then do it that way.

The app where I first used this trick was a music scheduling system, so 
had a number of subsystems:
- a classical music catalogue (complex because a work frequently
  lacks a name but often exists as various versions and arrangements, 
  and equally frequently needs to be structured as movements/acts and
  parts within the movement of act
- a performers catalogue
- a performance catalogue, used for planning, performance scheduling and 
  tracking repeated performances
- the ability to track usage of parts of work for contractual purposes.
- clash checking (used to avoid undue concentration on particular
  composers/performers/works)
- tracking composer anniversaries (used in planning)

Consequently, both the online parts of the system and the overnight batch 
operation had a good-sized suite of largely unconnected subsystems but 
all accessed the same parts of a fairly complex database. Hence the need 
to keep tabs on which program had last updated a record.

All this was long ago and far away, so the entire system was written in 
COBOL and worked with 80x25 green screens and printed reports.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

Thread

JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-13 20:12 +0200
  Re: JPA and extra fields Eternal Hope <laughingspam99@gmail.com> - 2015-08-13 20:29 +0100
    Re: JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-17 07:40 +0200
  Re: JPA and extra fields Arne Vajhøj <arne@vajhoej.dk> - 2015-08-13 22:30 -0400
    Re: JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-17 08:22 +0200
      Re: JPA and extra fields Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-17 11:40 +0000
        Re: JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-17 14:36 +0200
          Re: JPA and extra fields Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-17 18:08 +0000
            Re: JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-17 21:24 +0200
              Re: JPA and extra fields Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-17 22:47 +0000
                Re: JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-19 11:32 +0200
          Re: JPA and extra fields Arne Vajhøj <arne@vajhoej.dk> - 2015-08-17 19:48 -0400
        Re: JPA and extra fields Eternal Hope <laughingspam99@gmail.com> - 2015-08-18 06:25 +0100
          Re: JPA and extra fields Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-18 10:49 +0000
            Re: JPA and extra fields Eternal Hope <laughingspam99@gmail.com> - 2015-08-19 09:00 +0100
              Re: JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-19 11:36 +0200
                Re: JPA and extra fields Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-19 10:48 +0000
      Re: JPA and extra fields Arne Vajhøj <arne@vajhoej.dk> - 2015-08-17 19:46 -0400
        Re: JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-19 11:28 +0200
    Re: JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-19 11:53 +0200
      Re: JPA and extra fields Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-19 10:51 +0000
        Re: JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-19 13:14 +0200
          Re: JPA and extra fields Cecil Westerhof <Cecil@decebal.nl> - 2015-08-19 14:19 +0200
      Re: JPA and extra fields Arne Vajhøj <arne@vajhoej.dk> - 2015-08-19 19:13 -0400
  Re: JPA and extra fields Silvio <silvio@internet.com> - 2015-08-20 03:49 +0200

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