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Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert

From "Frank Millman" <frank@chagford.com>
Subject Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert
Date 2014-11-23 10:21 +0200
References (2 earlier) <5d474a87-e2a5-43d3-b07c-4a1194880b4d@googlegroups.com> <54716987.7040301@gmail.com> <mailman.16159.1416721303.18130.python-list@python.org> <ea4e3af8-f173-4706-ba4e-4eca9d701e40@googlegroups.com> <CAPTjJmp4Y5zowWn5yFtJutKO4H5jVtqLaNtWqEpA6B35xNdsNA@mail.gmail.com>
Newsgroups comp.lang.python
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"Chris Angelico" <rosuav@gmail.com> wrote in message 
news:CAPTjJmp4Y5zowWn5yFtJutKO4H5jVtqLaNtWqEpA6B35xNdsNA@mail.gmail.com...
>
> Entirely possible. I never did track down the actual cause of the
> SQLite3 issues my students were having; though I suspect it's not
> purely a Python API issue. I tried to demonstrate the concept of
> foreign keys using the sqlite3 command line tool, and did a sequence
> of commands which ought to have failed, but didn't.

The default is for sqlite3 to ignore foreign key contraints.

To enable them, add the following -

pragma foreign_keys = on;

It works for me.

Unfortunately it has a limitation, which they acknowledge but they say is 
unlikely to be addressed. You can access more than one database concurrently 
by using the 'attach' command, and qualifying a remote tablename as 
{database} dot {tablename}. You can then include the remote table in any sql 
command. However, it will not enforce foreign key constraints across 
databases.

Frank Millman

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Thread

SQLite3 in Python 2.7 Rejecting Foreign Key Insert llanitedave <llanitedave@birdandflower.com> - 2014-11-22 18:11 -0800
  Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Chris Angelico <rosuav@gmail.com> - 2014-11-23 13:22 +1100
    Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert llanitedave <llanitedave@birdandflower.com> - 2014-11-22 19:54 -0800
      Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Michael Torrie <torriem@gmail.com> - 2014-11-22 21:58 -0700
      Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Chris Angelico <rosuav@gmail.com> - 2014-11-23 16:41 +1100
        Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert llanitedave <llanitedave@birdandflower.com> - 2014-11-22 22:08 -0800
          Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Chris Angelico <rosuav@gmail.com> - 2014-11-23 17:32 +1100
            Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert llanitedave <llanitedave@birdandflower.com> - 2014-11-22 22:46 -0800
            Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Christian Gollwitzer <auriocus@gmx.de> - 2014-11-23 10:55 +0100
          Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert "Frank Millman" <frank@chagford.com> - 2014-11-23 10:21 +0200
            Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert llanitedave <llanitedave@birdandflower.com> - 2014-11-23 17:29 -0800
          Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Chris Angelico <rosuav@gmail.com> - 2014-11-23 19:31 +1100
            Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2014-11-23 11:40 +0200
              Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Chris Angelico <rosuav@gmail.com> - 2014-11-23 20:53 +1100
          Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-11-23 13:01 -0500
          Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert "Frank Millman" <frank@chagford.com> - 2014-11-24 10:05 +0200
          Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-11-24 13:44 -0500
          Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Chris Angelico <rosuav@gmail.com> - 2014-11-25 10:17 +1100
          Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert "Frank Millman" <frank@chagford.com> - 2014-11-25 07:31 +0200
          Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Chris Angelico <rosuav@gmail.com> - 2014-11-25 17:40 +1100
  Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-11-23 11:58 -0500
  Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert llanitedave <llanitedave@birdandflower.com> - 2014-11-23 18:22 -0800
    Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert Chris Angelico <rosuav@gmail.com> - 2014-11-24 15:49 +1100

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