that's rather a SQL-problem than one of perl.

USE database;

DROP TABLE IF EXISTS taxon;
CREATE TABLE taxon (t_id INT(n) PRIMARY KEY auto_increment,
                    [...]
                   );

DROP TABLE IF EXISTS node;
CREATE TABLE node (n_id INT(n) PRIMARY KEY auto_increment,
                   n_t_id INT(n) NOT NULL DEFAULT 0,
                   [...]
                  );

DROP TABLE IF EXISTS sequence;
CREATE TABLE sequence (s_id INT(n) PRIMARY KEY auto_increment,
                       s_t_id INTn) NOT NULL DEFAULT 0,
                       [...]
                      );
[download]

notice that every record in the node-table, and every record in the sequence-table has to contain the pointer to a record in the taxon-table. the one-to-many relationship will then be realized by something like:

$dbh->selectall_arrayref("SELECT * FROM taxon, node WHERE n_t_id = t_i
+d");
[download]

and the one-to-one realtionship you will find with a query like:

$dbh->selectrow_arrayref("SELECT * FROM node, taxon WHERE n_id = XXX A
+ND t_id = n_t_id");
[download]

how you then wrap that in an object-oriented code is a matter of taste. but basically these are the things that should go on in the background.

greez
TOD

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.