mysql query to create SEO friendly url from given table structure

Question

I am trying to create SEO friendly URLs using the below tables:

category

pages table

I am trying to write a mysql query that will generate URLs for all the pages in the pages table using the category table producing the below output.

Expected Ouput:

expected

Here is the MySql query that I tried for generating URLs upto 4 segments:

SELECT pg.id AS page_id, p3.id, p1.category AS segment1, p2.category AS segment2, p3.category AS segment3, 
pg.page_name AS PAGE , concat( '/', p1.category, '/', p2.category, '/', p3.category, '/', pg.page_name, '/' ) AS url
FROM category AS p1, category AS p2, category AS p3, pages AS pg
WHERE pg.category_id = p3.id
AND p3.parent_id = p2.id
AND p2.parent_id = p1.id

Link to SQL Fiddle

Have you checked out any database recursion? this looks like an exercise on recursion... just sayin' — hanzo2001
– hanzo2001, Commented Nov 29, 2013 at 9:14
@mahavir-munot, I believe that you can't do that for arbitrary URL depth without creating stored procedure (which would call itself recursively). — Dmitry Pljonkin
– Dmitry Pljonkin, Commented Nov 29, 2013 at 9:35
Things like this have been asked before: stack overflow. You should do some more research before attempting to do this — hanzo2001
– hanzo2001, Commented Nov 29, 2013 at 9:35

Community · Accepted Answer · 2017-05-23 11:44:08Z

1

Here is the answer to my own question:

I tried using the "MySql Modified preorder tree to create url" method which I find more useful in terms of query optimization and other research through stackoverflow.

edited May 23, 2017 at 11:44

CommunityBot

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answered Dec 6, 2013 at 15:33

Mahavir Munot

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Comments

Jacob A. · Accepted Answer · 2013-11-29 08:08:48Z

0

Not the best solution, but it works ;)

SELECT pagetable.id AS page_id
, c1.id
, pagetable.page_name AS PAGE 
, concat( 
    IF(c3.category IS NULL,'','/')
  , IF(c3.category IS NULL,'',c3.category)
  , IF(c2.category IS NULL,'','/')
  , IF(c2.category IS NULL,'',c2.category)
  , IF(c1.category IS NULL,'','/')
  , IF(c1.category IS NULL,'',c1.category)
  , '/'
  , pagetable.page_name
  , '/' ) AS url
FROM pages AS pagetable 
LEFT JOIN category AS c1
ON pagetable.category_id = c1.id
LEFT JOIN category AS c2
ON c1.parent_id = c2.id
LEFT JOIN category AS c3
ON c2.parent_id = c3.id

answered Nov 29, 2013 at 8:08

Jacob A.

2703 silver badges10 bronze badges

6 Comments

Jacob A. Over a year ago

yes, because there are only, 3 Joins, you could add more joins, but like i said, its not the best solution

hanzo2001 Over a year ago

Everyone should go check out another stackoverflow question

Mahavir Munot Over a year ago

@hanzo2001 I can use the left - right approach but I want to see if there is any other approach

hanzo2001 Over a year ago

here's the thing, you want to generate a hierarchical structure through a flat (linear) data table. I'm sorry to say this but the best (and complete) approach is through recursion. The other way is through the Adjacency List Model a la @lgoel style

Mahavir Munot Over a year ago

@hanzo2001 please see stackoverflow.com/questions/20422497/…

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