hello im implementing a portal and im choosing between the 'Nested Set' and
'Adjacency Lists tree' models.
<http://users.starpower.net/rjhalljr/Serve/MySQL/traer.html>
im perfectly aware of the 'Adjacency Lists tree' model how-to and I am
studying the 'Nested Set', example follows :
CREATE TABLE LanguageTree (
Language VARCHAR(255) PRIMARY KEY
, Parent VARCHAR(255)
, Lft LONG
, Rgt LONG
, INDEX idxLft (Lft)
, INDEX idxRgt (Rgt)
) Comment = "Related languages";
A[1 12]
/ \
/ \
B[2 3] C[4 11]
/ \
/ \
D[5 8] F[9 10]
|
E[6 7]
my doubt is that if i want to insert a new node, for example 'G' under 'A'
A[1 12]
/ | \
/ \
B[2 3] G[] C[4 11]
/ \
/ \
D[5 8] F[9 10]
|
E[6 7]
i have? to update almost every left,righ fields after that node, resulting
in a website performance downgrade ....
help? even if thjats the only way, how can i do it? perhaps im getting it
wrong ...
best regards
Jos� Moreira
TEGOPI S.A.
http://www.tegopi.pt
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