[schema] restore constraint checking when running on old sqlite
Old sqlite3 doesn't provide CHECK constraint names in error messages,
preventing us from translating a backend integrity error into a
ValidationError. This was added in 2012, but the sqlite3 version in
RHEL6 is older; so if we run on old sqlite, keep checking the
constraints in python rather than only in SQL.
Closes #10927494
=====================================================
|cubicweb| - The Semantic Web is a construction game!
=====================================================
|cubicweb| is a semantic web application framework, licensed under the LGPL,
that empowers developers to efficiently build web applications by reusing
components (called `cubes`) and following the well known object-oriented design
principles.
Main Features
~~~~~~~~~~~~~
* an engine driven by the explicit :ref:`data model
<TutosBaseCustomizingTheApplicationDataModel>` of the application,
* a query language named :ref:`RQL <RQL>` similar to W3C's SPARQL,
* a :ref:`selection+view <TutosBaseCustomizingTheApplicationCustomViews>`
mechanism for semi-automatic XHTML/XML/JSON/text generation,
* a library of reusable :ref:`components <Cube>` (data model and views) that
fulfill common needs,
* the power and flexibility of the Python_ programming language,
* the reliability of SQL databases, LDAP directories, Subversion and Mercurial
for storage backends.
Built since 2000 from an R&D effort still continued, supporting 100,000s of
daily visits at some production sites, |cubicweb| is a proven end to end solution
for semantic web application development that promotes quality, reusability and
efficiency.
QuickStart
~~~~~~~~~~
The impatient developer will move right away to :ref:`SetUpEnv` then to :ref:`ConfigEnv`.
Social
~~~~~~
* Chat on the `jabber forum`_
* Discuss on the `mailing-list`_
* Discover on the `blog`_
* Contribute on the forge_
.. _Logilab: http://www.logilab.fr/
.. _forge: http://www.cubicweb.org/project/
.. _Python: http://www.python.org/
.. _`jabber forum`: http://www.logilab.org/blogentry/6718
.. _`mailing-list`: http://lists.cubicweb.org/mailman/listinfo/cubicweb
.. _blog: http://www.cubicweb.org/blog/1238
Narrative Documentation
~~~~~~~~~~~~~~~~~~~~~~~
A.k.a. "The Book"
.. toctree::
:maxdepth: 2
book/intro/index
.. toctree::
:maxdepth: 2
tutorials/index
.. toctree::
:maxdepth: 3
book/devrepo/index
book/devweb/index
.. toctree::
:maxdepth: 2
book/admin/index
book/additionnal_services/index
book/annexes/index
Changes
~~~~~~~
.. toctree::
:maxdepth: 2
changes/changelog
Reference documentation
~~~~~~~~~~~~~~~~~~~~~~~
API
'''
.. toctree::
:maxdepth: 1
:glob:
api/*
.. toctree::
:maxdepth: 1
js_api/index
Developpers
~~~~~~~~~~~
.. toctree::
:maxdepth: 1
:glob:
dev/*
Indexes
~~~~~~~
* the :ref:`genindex`,
* the :ref:`modindex`,