Cela serait possible si votre SGBD supportait les requêtes récursives :
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 ;
Sortie :
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)
