Thanks Richard I understand how it works, quite simple really, and knowing they are used by the RBU extension explains why.
I am working on a book and I just wanted to understand how/where it could be used where a view, created on the same columns in an index, couldn't be. Paul www.sandersonforensics.com skype: r3scue193 twitter: @sandersonforens Tel +44 (0)1326 572786 http://sandersonforensics.com/forum/content.php?195-SQLite-Forensic-Toolkit -Forensic Toolkit for SQLite email from a work address for a fully functional demo licence On 15 June 2017 at 12:58, R Smith <rsm...@rsweb.co.za> wrote: > > On 2017/06/15 10:15 AM, Paul Sanderson wrote: > >> Thanks Richard - the View approach is fine for my needs - just wanted to >> know what the rationale was for the imposter tables given the ability to >> simulate the imposter table with a view. >> > > I'm thinking the easiest way to describe it is perhaps in programming > terms - > a view is like a function that computes and produces a result that may or > may not be a simple reflection of an internal variable, > and > an imposter table is rather more like a variable that lives at the same > memory address as another data structure so that querying it queries the > underlying structure direct (this part is also achievable by a view), but > changes to it also change in the underlying data structure (very unlike a > view). > > This is great if you are looking for a way to update an index > independently from its data, but is also, as has been pointed out numerous > times, quite dangerous - but then, breaking it is mostly fixable by a > simple REINDEX. > > Not sure if you can install such an imposter table on a corrupt database > file, moreso than a View anyway, but that actually might have some utility > towards retrieving or fixing (or at least gaining a better understanding > of) a corrupted data table / index, which I think Paul might be interested > in. > > > > _______________________________________________ > sqlite-users mailing list > sqlite-users@mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
