mysql query to create SEO friendly url from given table structure

问题

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

Category table

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:

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

回答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.

回答2:

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

来源：https://stackoverflow.com/questions/20280104/mysql-query-to-create-seo-friendly-url-from-given-table-structure

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