gp-export sounds very useful. I actually implemented something similar to help convert databases from one lisp to another (string serialization is not compatible across lisp implementations). This would be a more general solution to my hack. I'll look at it when I get a chance.
Cheers, Ian On Apr 24, 2009, at 1:04 PM, Alex Mizrahi wrote: > helo > > (Short introduction for those who does not know what is this about: > gp-export is a tool > to export/import databases in human-readable (SEXP) format, with > serialization based on > s-serialization of cl-prevalence, meant to work with different > databases. In > previous discussions > it was considered as a path of migration between version 0.9 and 1.0 > of > elephant/postmodern.) > > Just a few monthes passed, and I've made gp-export that is suitable > for > migration from 0.9 to 1.0. :) > The problem was that there was no support for btrees whatsoever, so > I had to > refactor it badly. > Anyway, now it seems to work and it even has some tests. > > However, for now gp-export does not back up whole store -- it only > iterates > through all objects > it finds in index and dumps them together with all their slots etc. > It is > such because it was meant > to be working with various stores. (But it supports only elephant/ > postmodern > so far.) > But probably if we also backup store root as some fake object > instance, it > would make full > elephant store backup. > > Also, there are some backend-specific pieces in exporter, such as > what slots > to filter out. > I've only made support for postmodern, if one wants it to work with > BDB, he > needs to add support. > Also, migration is backend-specific (as it needs to map between btree > classes), maybe it needs > some refactoring to be unified. > > So, the questions are: > Is there a need for such thing? > Are backups described above full/good enough? > Should it be somehow bundled with elephant or maintained separately? > Are there people who'd like to hack it to add support for different > stuff? > (Well, I can do this, but I'm not very fast :) ) > > By the way, besides gp-export, I've considered using elephant's > migration > for 0.9 to 1.0 upgrade: > > postmodern-0.9 --migration--> bdb-0.9 --upgrade--> bdb-1.0 -- > migration--> > postmodern-1.0 > > However, migration does not work right in version 0.9... And I'm not > very > enthusiastic about > digging old code. I've asked about this some time ago, as nobody > replied I'm > assuming nobody > cares, so I'm officially giving up. > > with best regards, Alex 'killerstorm' Mizrahi. > > > > > _______________________________________________ > elephant-devel site list > elephant-devel@common-lisp.net > http://common-lisp.net/mailman/listinfo/elephant-devel _______________________________________________ elephant-devel site list elephant-devel@common-lisp.net http://common-lisp.net/mailman/listinfo/elephant-devel
