this contains a very basic vfs implementation; kinda uses internal file abstraction stuff so a lot can be stripped out and replaced with fopen/fread/etc...
https://code.google.com/p/c-system-abstraction-component-gui/source/browse/src/sqlite/sqlite_interface.c maybe it's more cryptic than I think On Thu, Feb 12, 2015 at 11:52 AM, Roger Binns <rog...@rogerbinns.com> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 02/10/2015 07:03 PM, Jay Kreibich wrote: > > ... VFS is unlikely to make the cut. ... similar things about the > > xBestIndex() and xFilter() functions > > I haven't read the book, but one thing that may help is not using C > for these. I think it is easier to understand VFS & BestIndex etc > using a higher level language, and use those to prototype, and then > drop down to C once you understand the problem. > > As an example, my APSW wrapper (Python) lets you write a VFS > "inheriting" from an existing one. You only need to override the > methods you care about, rather than having to implement everything > from scratch. This is how hard it is to do a vfs that xors the data > read and written: > > http://rogerbinns.github.io/apsw/example.html#example-vfs > > This is a vtable with blank BestIndex implementation: > > http://rogerbinns.github.io/apsw/example.html#example-vtable > > I believe the wrappers for other languages are similar. Of course for > a book you'd have to pick a language/wrapper and hope it is acceptable > for the audience. > > Roger > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1 > > iEYEARECAAYFAlTdBHMACgkQmOOfHg372QRvYgCgg0Y1/Scvo+SGwOvPLkq3zBCF > nb0Anj2XQydblsSTFd0szBZ1afuLto8q > =mvfo > -----END PGP SIGNATURE----- > _______________________________________________ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
