[development] The new menu system

Larry Garfield larry at garfieldtech.com
Fri Sep 29 02:55:02 UTC 2006

On Thursday 28 September 2006 10:56, Dries Buytaert wrote:
> On 28 Sep 2006, at 14:37, Earl Miles wrote:
> > The actual URL entered is: node/12/edit/foo
> >
> > the simplistic version of the query would be:
> >
> > SELECT * FROM menu WHERE path IN ('node/12/edit/foo', 'node/12/
> > edit', 'node/12/%/foo', 'node/%/edit/foo', 'node/%/%/foo', 'node/%/
> > edit', 'node/%') ORDER BY weight DESC;
> >
> > This does have an order of N complexity in that there are 2^N-1 URL
> > possibilities for every URL fragment you have -- which gets
> > unwieldy around 7, but it is rare that you get URLs that long,
> > though I imagine it does happen from time to time. At this time we
> > believe this is an acceptable cost compared to the cost of the
> > system it is replacing, while leaving us with maximum flexibility.
> Interesting aproach, Earl.  I think this might work, and relatively
> fast too. :-)

Indeed!  This qualifies as an "Ooo" in my book.  And even if it is a 2^n 
algorithm, it's still being done in SQL as a not-unusual SQL query.  It's 
absolutely guaranteed that MySQL or Postgres will be faster than any 
searching we do in PHP.  

I also agree with Kahlid that we should use something other than % for 
simplicity.  *, ?, #, there's plenty of other characters we can use that 
wouldn't make the SQL uglier.

Larry Garfield			AIM: LOLG42
larry at garfieldtech.com		ICQ: 6817012

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of every one, and the receiver cannot dispossess himself of it."  -- Thomas 

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