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Code Editor : Memory_MDBnested.php
<?php // $Id: Memory_MDBnested.php 175303 2004-12-21 19:59:20Z dufuz $ ini_set('error_reporting',E_ALL); /** * this is a helper function, so i dont have to write so many prints :-) * @param array $para the result returned by some method, that will be dumped * @param string $string the explaining string */ function dumpHelper($para, $string = '', $addArray = false) { global $tree, $element; if ($addArray) { eval( "\$res=array(".$para.');' ); } else { eval( "\$res=".$para.';' ); } echo '<b>'.$para.' </b><i><u><span style="color: #008000">'.$string.'</span></u></i><br />'; // this method dumps to the screen, since print_r or var_dump dont // work too good here, because the inner array is recursive // well, it looks ugly but one can see what is meant :-) $tree->varDump($res); echo '<br />'; } /** * dumps the entire structure nicely * @param string $string the explaining string */ function dumpAllNicely($string = '') { global $tree; echo '<i><u><span style="color: #008000">'.$string.'</span></u></i><br />'; $all = $tree->getNode(); // get the entire structure sorted as the tree is, so we can simply foreach through it and show it foreach($all as $aElement) { for ($i = 0; $i < $aElement['level']; $i++) { echo ' '; } echo '<span style="color: red">'.$aElement['name'].'</span> ===> '; $tree->varDump(array($aElement)); } echo '<br />'; } /* use this to build the db table CREATE TABLE Memory_Nested_MDB ( id int(11) NOT NULL default '0', name varchar(255) NOT NULL default '', l int(11) NOT NULL default '0', r int(11) NOT NULL default '0', parent int(11) NOT NULL default '0', comment varchar(255) NOT NULL default '', PRIMARY KEY (id) ); This example demonstrates how to manage trees that are saved in a DB, it uses a very simple DB-structure, not nested trees (ok, that sucks, but it can be implemented :-) ) it reads out the entire tree upon calling the method 'setup', then you can work on the tree in whichever way you want, just have a look at the examples there are different ways to achieve things, i will try to demonstrate (all of) them */ require_once 'Tree/Tree.php'; // define the DB-table where the data shall be read from $options = array('table' => 'Memory_Nested_MDB' ,'whereAddOn' => "comment=''" ); // calling 'setupMemory' means to retreive a class, which works on trees, // that are temporarily stored in the memory, in an array // this means the entire tree is available at all time !!! // consider the resource usage and it's not to suggested to work // on huge trees (upto 1000 elements it should be ok, depending on your environment and requirements) // using 'setupMemory' // use the nested DB schema, which is actually implemented in Dynamic/DBnested // the class Memory/DBnested is only kind of a wrapper to read the entire tree // and let u work on it, which to use should be chosen on case by case basis $tree = Tree::setupMemory('MDBnested', 'mysql://root@localhost/tree_test', // the DSN $options); // pass the options we had assigned up there // add a new root element in the tree $rootId = $tree->add(array('name' => 'myElement')); // add an element under the new element we added $id = $tree->add(array('name' => 'subElement') , $rootId); // add another element under the parent element we added $id = $tree->add(array('name' => 'anotherSubElement') , $rootId , $id); // call 'setup', to build the inner array, so we can work on the structure using the // given methods $tree->setup(); dumpAllNicely('dump all after creation'); // get the path of the last inserted element dumpHelper('$tree->getPath( '.$id.' )' , 'dump the path from "myElement/anotherSubElement"'); $id = $tree->getIdByPath('myElement/subElement'); dumpHelper('$tree->getParent('.$id.')' , 'dump the parent of "myElement/subElement"' , true); // you can also use: $tree->data[$id]['parent'] $id = $tree->getIdByPath('myElement'); dumpHelper('$tree->getChild('.$id.')' , 'dump the child of "myElement"' , true); // you can also use: $tree->data[$id]['child'] $id = $tree->getIdByPath('myElement'); dumpHelper('$tree->getChildren('.$id.')' , 'dump the children of "myElement"'); // you can also use: $tree->data[$id]['children'] $id = $tree->getIdByPath('myElement/subElement'); dumpHelper('$tree->getNext('.$id.')' , 'dump the "next" of "myElement/subElement"' , true); // you can also use: $tree->data[$id]['next'] $id = $tree->getIdByPath('myElement/anotherSubElement'); dumpHelper('$tree->getPrevious('.$id.')' , 'dump the "previous" of "myElement/anotherSubElement"' , true); // you can also use: $tree->data[$id]['previous'] $id = $tree->getIdByPath('myElement'); $element = $tree->data[$id]['child']['next']['parent']; // refer to yourself again, in a very complicated way :-) dumpHelper('$element[\'id\']' , 'demo of using the internal array, for referencing tree-nodes, see the code'); $id = $tree->getIdByPath('myElement'); $element = $tree->data[$id]['child']['next']; // refer to the second child of 'myElement' dumpHelper('$element[\'id\']' , 'demo2 of using the internal array, for referencing tree-nodes, see the code'); /* $id = $tree->getIdByPath('myElement/anotherSubElement'); $tree->move( $id , 0 ); $tree->setup(); // rebuild the structure again, since we had changed it dumpAllNicely( 'dump all, after "myElement/anotherSubElement" was moved under the root' ); $moveId = $tree->getIdByPath('myElement'); $id = $tree->getIdByPath('anotherSubElement'); $tree->move( $moveId , $id ); $tree->setup(); // rebuild the structure again, since we had changed it dumpAllNicely( 'dump all, after "myElement" was moved under the "anotherSubElement"' ); */ $tree->setRemoveRecursively(true); $tree->remove($rootId); echo '<span style="color: red">ALL ELEMENTS HAVE BEEN REMOVED (uncomment this part to keep them in the DB after running this test script)</span>'; echo '<br /><br />'; ?>
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