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Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert

From Christian Gollwitzer <auriocus@gmx.de>
Newsgroups comp.lang.python
Subject Re: SQLite3 in Python 2.7 Rejecting Foreign Key Insert
Date 2014-11-23 10:55 +0100
Organization A noiseless patient Spider
Message-ID <m4sav0$shv$1@dont-email.me> (permalink)
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> <mailman.16161.1416724339.18130.python-list@python.org>

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Am 23.11.14 07:32, schrieb Chris Angelico:
> did a sequence
> of commands which ought to have failed, but didn't. Let's see if I can
> recreate this:
>
> rosuav@sikorsky:~$ sqlite3
> SQLite version 3.7.13 2012-06-11 02:05:22
> Enter ".help" for instructions
> Enter SQL statements terminated with a ";"
> sqlite> create table foo (val text primary key);
> sqlite> create table bar (val text references foo on delete set null);
> sqlite> insert into foo values ('asdf');
> sqlite> insert into bar values ('asdf');
> sqlite> insert into bar values ('qwer');
> sqlite> select * from foo;
> asdf
> sqlite> select * from bar;
> asdf
> qwer
> sqlite> delete from foo;
> sqlite> select * from foo;
> sqlite> select * from bar;
> asdf
> qwer
>
> So the foreign key is being completely ignored.

SQLite does foreign keys by running a trigger. You need to activate it

	https://www.sqlite.org/foreignkeys.html#fk_enable

Apfelkiste:VecTcl chris$ sqlite3
SQLite version 3.7.11 2012-03-20 11:35:50
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> PRAGMA foreign_keys = ON;
sqlite> create table foo (val text primary key);
sqlite> create table bar (val text references foo on delete set null);
sqlite> insert into foo values ('asdf');
sqlite> insert into bar values ('asdf');
sqlite> insert into bar values ('qwer');
Error: foreign key constraint failed
sqlite> select * from foo;
asdf
sqlite> select * from bar;
asdf
sqlite> delete from foo;
sqlite> select * from foo;
sqlite> select * from bar;

sqlite>


Not sure, if this helps the OP, though.

	Christian

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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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