[session] call rollback in Connection.__exit__
If we just free the cnxset and clear the Connection, we're missing the
pending operation's rollback_event callbacks, which may be needed for
cleanup.
.. winclude:: search_sample_queries
You can as well type complex queries using the RQL_ query language,
used every where to build dynamic pages of this site.
You can use one of the following prefixes to specify which kind of search you
want:
* `rql` : RQL query
* `text` : full text search
.. _RQL: doc/tut_rql