Yeah probably is I already have it with web2py but it is slow with 20,000 nodes takes around 5-10 seconds to load the results.
On Wed, Apr 11, 2012 at 7:29 AM, Richard Vézina <ml.richard.vez...@gmail.com > wrote: > I made a lot of that last year... Sometimes it was driving me nuts, > needing to have the same columns for each table in the union... Good naming > convention helps to make thing clearer when you get back to the code... > > Note, I would try to make it with web2py first if I were needing to write > those code again. > > Richard > > > On Wed, Apr 11, 2012 at 10:09 AM, Bruce Wade <bruce.w...@gmail.com> wrote: > >> Yeah not sure have never used recursion at the database level. However it >> seems to be the only option, none of the other options in that chapter fit >> my needs. >> >> >> On Wed, Apr 11, 2012 at 7:05 AM, Richard Vézina < >> ml.richard.vez...@gmail.com> wrote: >> >>> Recursion is slow because the union... But it may fit yours need better >>> I don't know. >>> >>> Richard >>> >>> >>> On Wed, Apr 11, 2012 at 9:45 AM, Bruce Wade <bruce.w...@gmail.com>wrote: >>> >>>> Ok so I have read the chapter I think the best option is postgres >>>> recursive queries. >>>> >>>> On Tue, Apr 10, 2012 at 10:39 AM, Richard Vézina < >>>> ml.richard.vez...@gmail.com> wrote: >>>> >>>>> Yes AntiPattern cover 4 or 5 kind of tree representation, classify >>>>> them depending of usage and gives pros and cons. >>>>> >>>>> I choose Closure table since it was one of the more complet for my >>>>> case. But if parent node is changing frequently it's not the more >>>>> effecient >>>>> tree antipattern. >>>>> >>>>> Have look it is pretty instructive. >>>>> >>>>> Book contain little more explanation, but there is this slide : >>>>> >>>>> >>>>> http://www.slideshare.net/billkarwin/practical-object-oriented-models-in-sql >>>>> >>>>> Richard >>>>> >>>>> >>>>> On Tue, Apr 10, 2012 at 7:32 AM, stefaan <stefaan.hi...@gmail.com>wrote: >>>>> >>>>>> >>>>>> >>>>>> >>>>>> Well I know the major bottle neck in the site is the binary tree. I >>>>>>> am still trying to figure out how to do this the best and most >>>>>>> efficient. >>>>>>> >>>>>> >>>>>> Maybe this could be useful: >>>>>> http://dirtsimple.org/2010/11/simplest-way-to-do-tree-based-queries.html >>>>>> >>>>>> >>>>> >>>>> >>>> >>>> >>>> -- >>>> -- >>>> Regards, >>>> Bruce Wade >>>> http://ca.linkedin.com/in/brucelwade >>>> http://www.wadecybertech.com >>>> http://www.fittraineronline.com - Fitness Personal Trainers Online >>>> http://www.warplydesigned.com >>>> >>>> >>> >> >> >> -- >> -- >> Regards, >> Bruce Wade >> http://ca.linkedin.com/in/brucelwade >> http://www.wadecybertech.com >> http://www.fittraineronline.com - Fitness Personal Trainers Online >> http://www.warplydesigned.com >> >> > -- -- Regards, Bruce Wade http://ca.linkedin.com/in/brucelwade http://www.wadecybertech.com http://www.fittraineronline.com - Fitness Personal Trainers Online http://www.warplydesigned.com
