Zapytanie MySQL — identyfikowanie danych przy użyciu nazw URL, w których dane są zorganizowane w hierarchię

Byłoby to możliwe, gdyby Twój DBMS obsługiwał zapytania rekurencyjne:

DROP SCHEMA tmp CASCADE;
CREATE SCHEMA tmp ;

CREATE TABLE tmp.webmeuk
    ( id INTEGER NOT NULL PRIMARY KEY
    , slug VARCHAR
    , content_type_id INTEGER NOT NULL
    , parent_id INTEGER REFERENCES tmp.webmeuk(id)
    );
INSERT INTO tmp.webmeuk( id , slug, content_type_id , parent_id )
VALUES(  0 , 'HTTP://pr0n.mysite.xx',    5 , NULL )
    , (  1 , 'portfolio',   5 , 0 )
    , (  2 , 'about-us',    1 , 0 )
    , (  3 , 'find-us',     1 , 0 )
    , (  4 , 'contact-us',  1 , 2 )
    , (  5 , 'find-us',     1 , 4 )
    ;

-- a room with a view
CREATE VIEW tmp.reteview AS (
    WITH RECURSIVE xx AS (
        SELECT w0.id AS id
        , w0.slug AS slug
        , w0.content_type_id AS content_type_id
        , w0.slug AS fullpath
        FROM tmp.webmeuk w0
        WHERE w0.parent_id IS NULL
      UNION 
        SELECT w1.id AS id
        , w1.slug AS slug
        , w1.content_type_id AS content_type_id
        , xx.fullpath || '/'::text || w1.slug AS fullpath
        FROM tmp.webmeuk w1, xx
        WHERE w1.parent_id = xx.id
        )
    SELECT * FROM xx
    );

SELECT * FROM tmp.reteview ;

-- Change one row of data
UPDATE tmp.webmeuk
SET slug = 'what-about-us'
WHERE id = 2;

SELECT * FROM tmp.reteview ;

Wyjście:

NOTICE:  drop cascades to 2 other objects
DETAIL:  drop cascades to table tmp.webmeuk
drop cascades to view tmp.closure
DROP SCHEMA
CREATE SCHEMA
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "webmeuk_pkey" for table "webmeuk"
CREATE TABLE
INSERT 0 6
CREATE VIEW
 id |         slug          | content_type_id |                     fullpath                  
----+-----------------------+-----------------+---------------------------------------------------
  0 | HTTP://pr0n.mysite.xx |               5 | HTTP://pr0n.mysite.xx
  1 | portfolio             |               5 | HTTP://pr0n.mysite.xx/portfolio
  2 | about-us              |               1 | HTTP://pr0n.mysite.xx/about-us
  3 | find-us               |               1 | HTTP://pr0n.mysite.xx/find-us
  4 | contact-us            |               1 | HTTP://pr0n.mysite.xx/about-us/contact-us
  5 | find-us               |               1 | HTTP://pr0n.mysite.xx/about-us/contact-us/find-us
(6 rows)

UPDATE 1
 id |         slug          | content_type_id |                        fullpath                    
----+-----------------------+-----------------+--------------------------------------------------------
  0 | HTTP://pr0n.mysite.xx |               5 | HTTP://pr0n.mysite.xx
  1 | portfolio             |               5 | HTTP://pr0n.mysite.xx/portfolio
  3 | find-us               |               1 | HTTP://pr0n.mysite.xx/find-us
  2 | what-about-us         |               1 | HTTP://pr0n.mysite.xx/what-about-us
  4 | contact-us            |               1 | HTTP://pr0n.mysite.xx/what-about-us/contact-us
  5 | find-us               |               1 | HTTP://pr0n.mysite.xx/what-about-us/contact-us/find-us
(6 rows)