completeamateur Posted October 25, 2008 Share Posted October 25, 2008 Hi guys, I want to code the breadcrumb for my website i.e. Home > Book > Chapter > Page My navigation is structured in a table aptly named 'navigation'. CREATE TABLE IF NOT EXISTS `navigation` ( `navID` smallint(5) unsigned NOT NULL auto_increment, `nav` text character set utf8 NOT NULL, `url` text character set utf8 NOT NULL, `parentID` smallint(5) unsigned default NULL, PRIMARY KEY (`navID`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ; A contentID (linked to navID) is specified for the current page. Will I have to 'backwards search' the navigation table for the relevant chapter/book? All suggestions welcome... Link to comment https://forums.phpfreaks.com/topic/130053-coding-the-breadcrumb/ Share on other sites More sharing options...
corbin Posted October 25, 2008 Share Posted October 25, 2008 You will have to keep checking the parent Id until there isn't one. Link to comment https://forums.phpfreaks.com/topic/130053-coding-the-breadcrumb/#findComment-674656 Share on other sites More sharing options...
completeamateur Posted October 25, 2008 Author Share Posted October 25, 2008 Bugger. Thanks for the response. Link to comment https://forums.phpfreaks.com/topic/130053-coding-the-breadcrumb/#findComment-674684 Share on other sites More sharing options...
corbin Posted October 25, 2008 Share Posted October 25, 2008 No problem. Someone might have some genius way to do it, but that's about all I can think of.... Link to comment https://forums.phpfreaks.com/topic/130053-coding-the-breadcrumb/#findComment-674690 Share on other sites More sharing options...
Daniel0 Posted October 26, 2008 Share Posted October 26, 2008 The "genious" way you could use is called the "modified preorder tree traversal" algorithm (or "nested set" if you'd like a shorter name). Using this algorithm you'll be able to fetch the entire tree in a single query. http://dev.mysql.com/tech-resources/articles/hierarchical-data.html Link to comment https://forums.phpfreaks.com/topic/130053-coding-the-breadcrumb/#findComment-674960 Share on other sites More sharing options...
corbin Posted October 26, 2008 Share Posted October 26, 2008 Oooo nice link. I figured there had to be some better way. Link to comment https://forums.phpfreaks.com/topic/130053-coding-the-breadcrumb/#findComment-675034 Share on other sites More sharing options...
completeamateur Posted October 27, 2008 Author Share Posted October 27, 2008 Thanks daniel, that's the stuff dreams are made of! I'll get my head down. Thanks again. Link to comment https://forums.phpfreaks.com/topic/130053-coding-the-breadcrumb/#findComment-675998 Share on other sites More sharing options...
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