Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!bcyclone02.am1.xlned.com!bcyclone02.am1.xlned.com!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path: <ian.g.kelly@gmail.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.062
X-Spam-Evidence: '*H*': 0.88; '*S*': 0.00; 'happens.': 0.09; 'python': 0.11; 're-read': 0.16; 'wrote:': 0.18; 'starts': 0.20; 'work,': 0.20; 'specifies': 0.24; '&gt;': 0.26; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'message-id:@mail.gmail.com': 0.30; 'open': 0.33; 'transaction': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'nov': 0.38; 'to:addr:python-list': 0.38; 'anything': 0.39; 'to:addr:python.org': 0.39; 'how': 0.40; 'statement,': 0.68; '4:26': 0.84
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=xcq2s3PdpIIl7+KH0DDrHcgO+1Zumby8vbsoKWZKKJI=; b=wJegIutHG/cO39IH6MsyfzlhrSty2ETW6k5lGOHFLSwOQkQXrakOhheoDwk3sr17+s 6P2dxEfDwGuI3q949meATvZvGXbSaAziJKAvZRh2R660T81DVlp84shkPChhIwW/l9vR 7n+WgumipzWE0AV/rG3u1+7mgbgMvvfakXJyvFQ7Bk8e9MXo7Hl3MMPnmgFNgz0zdU4K X8o8SpOnKgWMhat0tdXyrN4cL0GFnq63hl7wW5CUgwm24YroIh3dqa9xqC1/Sw+Lm+ON 7KP6Bp2mPTW0biwlh4a7iKneHaQy54F5OD+3y4ONtPknpzd7OkbpiaGRr60FjN29+3D0 QVBQ==
MIME-Version: 1.0
X-Received: by 10.66.232.70 with SMTP id tm6mr66885421pac.120.1417111368247; Thu, 27 Nov 2014 10:02:48 -0800 (PST)
In-Reply-To: <m56u4s$baa$1@ger.gmane.org>
References: <m56u4s$baa$1@ger.gmane.org>
Date: Thu, 27 Nov 2014 11:02:48 -0700
Subject: Re: Db transactions and locking
From: Ian Kelly <ian.g.kelly@gmail.com>
To: Python <python-list@python.org>
Content-Type: multipart/alternative; boundary=047d7b111e09b632300508daf308
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list/>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.16379.1417111373.18130.python-list@python.org>
Lines: 22
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1417111373 news.xs4all.nl 2973 [2001:888:2000:d::a6]:60431
X-Complaints-To: abuse@xs4all.nl
X-Received-Bytes: 3829
X-Received-Body-CRC: 1849339324
Xref: csiph.com comp.lang.python:81647

--047d7b111e09b632300508daf308
Content-Type: text/plain; charset=UTF-8

On Nov 27, 2014 4:26 AM, "Frank Millman" <frank@chagford.com> wrote:
> All Python database adaptors that I have used start a transaction when you
> open a cursor. I have just re-read DB-API 2.0, and I cannot see anything
> that specifies this behaviour, but AFAICT this is what happens.

I don't know how others work, but cx_Oracle starts a transaction when you
execute a statement, not when you open a cursor.

--047d7b111e09b632300508daf308
Content-Type: text/html; charset=UTF-8

<p dir="ltr"><br>
On Nov 27, 2014 4:26 AM, &quot;Frank Millman&quot; &lt;<a href="mailto:frank@chagford.com">frank@chagford.com</a>&gt; wrote:<br>
&gt; All Python database adaptors that I have used start a transaction when you<br>
&gt; open a cursor. I have just re-read DB-API 2.0, and I cannot see anything<br>
&gt; that specifies this behaviour, but AFAICT this is what happens.</p>
<p dir="ltr">I don&#39;t know how others work, but cx_Oracle starts a transaction when you execute a statement, not when you open a cursor.</p>

--047d7b111e09b632300508daf308--