Might be worth checking a Graph Database such as Neo4j as a possible solution for your domain model requirements.
The book: http://amzn.com/1449356265 Free PDF Version of the book: http://graphdatabases.com On Oct 6, 2013, at 2:08 PM, Ramsey Gurley <rgur...@smartpractice.com> wrote: > You need a schema-less approach if you need to create these things at > runtime. Relational databases really aren't such a good fit in these cases. > You can shoe horn something into a RDBMS with EAV or datablobs, but it won't > scale well. > > If you're using Postgres 9.2.x or better, there is built in JSON data storage > you could use. You can write stored procedures using PLV8, an embedded V8 > javascript engine. It's also <flamebait>faster than MongoDB</flamebait> based > on what I've read. > > > > On Sat, Oct 5, 2013 at 2:25 PM, Mark Wardle <m...@wardle.org> wrote: > Thanks both, > > This advice is all very helpful. I might do some performance measurement to > see whether keeping horizontal inheritance is actually causing problems. I > think I'm batch fetching which should mean joining on multiple tables and not > a SELECT on each and every entity. > > The problem is that with single table inheritance, combining all data forms, > I will end up with a database table with 449 columns - which might have its > own set of problems! > > Out of curiosity, am I going to hit any problems combining approaches? Using > single table inheritance when there are many common properties and using > horizontal inheritance when the majority of properties are not shared. > > What I should do instead is write a generic entity which itself stores a > runtime-defined, stored in the database (and modelling in EOF) bunch of > properties in an NSDictionary and has logic provided a runtime chosen > delegate. Then I could create new data collection forms using a dedicated UI > and little overhead. Then we'd just set-up a bunch of D2W rules to ask the > generic entity for displayPropertyKeys etc. for the appropriate fake entity. > Anyone created fake entities like this either? > > Best wishes, > > Mark > > > On 4 Oct 2013, at 19:23, Chuck Hill <ch...@global-village.net> wrote: > >> On 2013-10-04 11:06 AM, "Ramsey Gurley" wrote: >> >> Not to contradict Chuck (he is always right), >> >> Will someone PLEASE tell my wife? >> >> >> -- >> Chuck Hill >> Executive Managing Partner, VP Development and Technical Services >> >> Practical WebObjects - for developers who want to increase their overall >> knowledge of WebObjects or who are trying to solve specific problems. >> http://www.global-village.net/gvc/practical_webobjects >> >> Global Village Consulting ranks 13th in 2012 in BIV's Top 100 Fastest >> Growing Companies in B.C! >> >> Global Village Consulting ranks 44th in 25th annual PROFIT 500 ranking of >> Canada’s Fastest-Growing Companies by PROFIT Magazine! > > -- > Dr. Mark Wardle > Consultant Neurologist, University Hospital Wales, Cardiff, UK > Email: mark.war...@wales.nhs.uk or m...@wardle.org Twitter: @mwardle > Telephone: 02920745274 (secretary) or facsimile: 02920744166 > > > > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/webobjects-dev/kelleherk%40gmail.com > > This email sent to kelleh...@gmail.com
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