Apsw

=========

Added support for :meth:`Connection.status` (calls `sqlite3_db_status
<https://sqlite.org/c3ref/db_status.html>`__).

The legacy Windows `Compiled Help Format
<https://en.wikipedia.org/wiki/Microsoft_Compiled_HTML_Help>`__
documentation is no longer produced - the help compiler setup program
can't cope with modern machines.

=========

Do not free a structure on failure to register a virtual table module
as SQLite does that anyway.

Added SQLITE_OPEN_MEMORY constant.

===========

No changes to APSW. Binary rebuilds due to SQLite bugfixes.

=========

Re-enabled the asyncvfs.

Added :attr:`Cursor.description` to make DB API interoperability a
little easier (:issue:`131`).

Added SQLITE_DBSTATUS_CACHE_WRITE and SQLITE_CANTOPEN_ISDIR constants.

=========

Added SQLITE_ABORT_ROLLBACK and SQLITE_FCNTL_PRAGMA constants.

Added :meth:`Connection.readonly`.

Changed :attr:`Connection.filename` which used to return the string
used to open the database and now returns the absolute pathname.

Added :meth:`Connection.db_filename`.

=========

The default sector size returned in VFS routines is 4,096 to match
SQLite's new default.

Several links to SQLite tickets and documentation were updated
(:issue:`122`).

The async vfs is disabled due to a bug in its code that leads to
random memory reads when dealing with filenames.

Added SQLITE_CONFIG_GETPCACHE2, SQLITE_CONFIG_GETPCACHE2,
SQLITE_FCNTL_POWERSAFE_OVERWRITE, SQLITE_FCNTL_VFSNAME and
SQLITE_IOCAP_POWERSAFE_OVERWRITE constants.

Fix shell dumping when SQLite doesn't strip trailing comments from
view declarations (`discussed here
<https://sqlite.org/src/info/c04a8b8a4f>`__)

Added a :class:`URIFilename` class to encapsulate how SQLite provides
URI parameters to VFS routines (:issue:`124`).

Compatibility break: Depending on flags your VFS xOpen method may get
a :class:`URIFilename` or a string for the filename. You can still
pass either to the :class:`VFSFile`.

Compatibility break: The :doc:`vfs` code used to always run strings
you provided through :meth:`VFS.xFullPathname`. This isn't possible
with URI pathnames so that code has been removed. If you construct
filenames for :meth:`VFS.xOpen` directly (ie bypassing the SQLite
database open call) then you must call :meth:`VFS.xFullPathname`
yourself first to ensure relative pathnames are turned into absolute
pathnames. The SQLite API guarantees that filenames passed to
:meth:`VFS.xOpen` are exactly what was returned from
:meth:`VFS.xFullPathname`.