Groups > comp.lang.java.programmer > #37263

Re: Which databases are the most used with Java

Path	csiph.com!news.redatomik.org!aioe.org!.POSTED!not-for-mail
From	Arne Vajhøj <arne@vajhoej.dk>
Newsgroups	comp.lang.java.programmer
Subject	Re: Which databases are the most used with Java
Date	Thu, 17 Aug 2017 18:11:17 -0400
Organization	Aioe.org NNTP Server
Lines	46
Message-ID	<on54a4$1clf$1@gioia.aioe.org> (permalink)
References	<87y3qovwjb.fsf@munus.decebal.nl> <omovh9$ad2$1@news.albasani.net> <87tw1bx2c9.fsf@munus.decebal.nl> <omptib$5qm$1@news.albasani.net> <evbk6cFud9oU1@mid.individual.net> <878tins1li.fsf@munus.decebal.nl> <omqchj$3n6$1@news.albasani.net> <on2r27$1ujh$1@gioia.aioe.org> <on5247$q8$1@news.albasani.net>
NNTP-Posting-Host	PBuS014lhzVyHjLbXmo/ZQ.user.gioia.aioe.org
Mime-Version	1.0
Content-Type	text/plain; charset=iso-8859-15; format=flowed
Content-Transfer-Encoding	8bit
X-Complaints-To	abuse@aioe.org
User-Agent	Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1
Content-Language	en-US
X-Notice	Filtered by postfilter v. 0.8.2
Xref	csiph.com comp.lang.java.programmer:37263

Show key headers only | View raw

On 8/17/2017 5:33 PM, Sebastian wrote:
> Am 17.08.2017 um 03:21 schrieb Arne Vajhøj:
>> On 8/13/2017 4:24 PM, Sebastian wrote:
>>>                                                               and
>>> surprising things can happen, starting with your mapping from database
>>> types to Java SQL types (NUMERIC?, REAL?, DECIMAL?... - and this can
>>> change even when updating from version of a driver to another of the
>>> same vendor).
>>
>> ????
>>
>> JDBC defines mapping for standard types.
>>
>> NUMERIC and DECIMAL maps to BigDecimal.
>>
>> REAL maps to float or Float depending on context.

> I did not mean that mapping, but the step before it, concerning 
> metadata: the mapping of database types (what you put in the CREATE 
> TABLE statement to define the columns) to standard types, i. e. 
> constants in java.sql.Types. With Oracle, you may get a description of 
> all supported data types with DatabaseMetadata.getTypeInfo(), or call 
> DatabaseMetadata.getColumns() on a table.

> Metadata is one of the areas where there's little standardization, and 
> drivers from different vendors differ to a greater extent. In part this 
> is understandable, because the type inventories differ so much. But even 
> when types are practically identical between vendors, you may get 
> different metadata. For example, in SQL Server DECIMAL and NUMERIC are 
> synonymous in the database, but still they chose to map them to the two 
> respective Types constants (which have no such synonymity assumption) 
> instead of choosing the same target for both. In some other databases, 
> java.sql.Types.NUMERIC is mapped from some integer type.
> 
> Sorry for the lengthy clarification. I'd like to avoid to get 
> side-tracked in this thread. I just wanted to point out one possible 
> pitfall in designing a vendor-independent layer above JDBC.

Ah.

Yes - DDL or code that use DDL data are probably not very portable.

Arne

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