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2011-12-12T13:27:46.397
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@Abiel, Based on your comment that each node probably doesn't have more than 50 direct children, and in that case (where 62 child nodes will be enough)—as @Bohemian stated on the comment—we could use computer-readable code <code>0-9A-Za-z</code> (<a href="http://en.wikipedia.org/wiki/Base_62" rel="nofollow">Base 62 Encoding</a>), we could set a new <code>VARCHAR( 255 ) BINARY</code> column to help us with sorting. <pre><code>CREATE TABLE `test`.`tree` ( `computer_readable` VARCHAR( 255 ) BINARY NOT NULL , `human_readable` VARCHAR( 255 ) NOT NULL , `title` VARCHAR( 255 ) NOT NULL , PRIMARY KEY ( `computer_readable` ) , INDEX ( `human_readable` ) ); </code></pre> As you might already noticed, the <code>computer_readable</code> column is defined as <code>BINARY</code>, so we could have up to 62 <code>[0-9A-Za-z]</code> (instead of 36 <code>[0-9a-z]</code>) child nodes for each node. <pre><code>mysql> SELECT 'a' = 'A'; +-----------+ | 'a' = 'A' | +-----------+ | 1 | +-----------+ 1 row in set (0.00 sec) mysql> SELECT BINARY 'a' = 'A'; +------------------+ | BINARY 'a' = 'A' | +------------------+ | 0 | +------------------+ 1 row in set (0.00 sec) mysql> SELECT BINARY 'a' > 'A'; +------------------+ | BINARY 'a' > 'A' | +------------------+ | 1 | +------------------+ 1 row in set (0.00 sec) </code></pre> So, with this new field, we could have the data in this format (stated in CSV below): <pre><code>"1";"1";"Books" "11";"1.1";"Fiction" "111";"1.1.1";"Science-Fiction" "12";"1.2";"Self-Help" "121";"1.2.1";"Motivational" "1A";"1.10";"Textbooks" "1e";"1.40";"Coloring Books" "2";"2";"Music" "21";"2.1";"Classical" </code></pre> Which MySQL will happily sort for us <pre><code>mysql> SELECT * FROM `tree` ORDER BY `computer_readable`; +-------------------+----------------+-----------------+ | computer_readable | human_readable | title | +-------------------+----------------+-----------------+ | 1 | 1 | Books | | 11 | 1.1 | Fiction | | 111 | 1.1.1 | Science-Fiction | | 12 | 1.2 | Self-Help | | 121 | 1.2.1 | Motivational | | 1A | 1.10 | Textbooks | | 1e | 1.40 | Coloring Books | | 2 | 2 | Music | | 21 | 2.1 | Classical | +-------------------+----------------+-----------------+ 9 rows in set (0.00 sec) </code></pre> Hope this helps.
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