基于左右值的无限分类算法

基于左右值的无限分类算法,php,由于之前采用的递归排序无限分类方法感觉不是很理想,于是参考了国外同国内的左右值排序相关方法,自己写了一个基于左右值的无限分类类,欢迎大家测试,另外还有用到一个mysql操作类,由于不是原创就不提供了,如果需要的可以PM我

<?php/** * 基于左右值排序的无限分类算法 * 数据库结果为CREATE TABLE om_catagory (    CatagoryID int(10) unsigned NOT NULL auto_increment, Name varchar(50) default '',    Lft int(10) unsigned NOT NULL default '0',    Rgt int(10) unsigned NOT NULL default '0',    PRIMARY KEY (id),    KEY lft (lft),    KEY rgt (rgt) ) * 更多的关于左右值排序的例子 * http://www.chinaunix.net/jh/27/239532.html(http://dev.mysql.com/tech-resources/articles/hierarchical-data.html) * @author [email][e-mail][/email]  * @version      1.0 * @copyright psdshow * 欢迎光临我的个人日志 http://www.dayanmei.com */class sortclass{/** * Description * @var        * @since     1.0 * @access    private */var $db;/** * Description * @var        * @since     1.0 * @access    private */var $tablefix;/** * Short description.  * 构造函数,引入数据库操作类函数 * Detail description * @param      none * @global     none * @since      1.0 * @access     private * @return     void * @update     date time*/function sortclass(){global $db;$this->db=$db;$this->tablefix="om_";} // end func/** * Short description.  * 增加新的分类 * Detail description * @param      none * @global     none * @since      1.0 * @access     private * @return     void * @update     date time*/function addsort($CatagoryID,$SortName){if($CatagoryID==0){ $Lft=0; $Rgt=1; }else{ $Result=$this->checkcatagory($CatagoryID); //取得父类的左值,右值 $Lft=$Result['Lft']; $Rgt=$Result['Rgt']; $this->db->query("UPDATE `".$this->tablefix."catagory` SET `Lft`=`Lft`+2 WHERE `Lft`>$Rgt"); $this->db->query("UPDATE `".$this->tablefix."catagory` SET `Rgt`=`Rgt`+2 WHERE `Rgt`>=$Rgt"); }//插入if($this->db->query("INSERT INTO `".$this->tablefix."catagory` SET `Lft`='$Rgt',`Rgt`='$Rgt'+1,`Name`='$SortName'")){ //$this->referto("成功增加新的类别","JAVASCRIPT:HISTORY.BACK(1)",3); return 1; }else{ //$this->referto("增加新的类别失败了","JAVASCRIPT:HISTORY.BACK(1)",3); return -1; }} // end func/** * Short description.  * 删除类别 * Detail description * @param      none * @global     none * @since      1.0 * @access     private * @return     void * @update     date time*/function deletesort($CatagoryID){//取得被删除类别的左右值,检测是否有子类,如果有就一起删除$Result=$this->checkcatagory($CatagoryID);$Lft=$Result['Lft'];$Rgt=$Result['Rgt'];//执行删除if($this->db->query("DELETE FROM `".$this->tablefix."catagory` WHERE `Lft`>=$Lft AND `Rgt`<=$Rgt")){ $Value=$Rgt-$Lft+1; //更新左右值 $this->db->query("UPDATE `".$this->tablefix."catagory` SET `Lft`=`Lft`-$Value WHERE `Lft`>$Lft"); $this->db->query("UPDATE `".$this->tablefix."catagory` SET `Rgt`=`Rgt`-$Value WHERE `Rgt`>$Rgt"); //$this->referto("成功删除类别","javascript:history.back(1)",3); return 1; }else{ //$this->referto("删除类别失败了","javascript:history.back(1)",3); return -1; }} // end func /** * Short description.  * 1,所有子类,不包含自己;2包含自己的所有子类;3不包含自己所有父类4;包含自己所有父类 * Detail description * @param      none * @global     none * @since      1.0 * @access     private * @return     void * @update     date time*/function getcatagory($CatagoryID,$type=1){$Result=$this->checkcatagory($CatagoryID);$Lft=$Result['Lft'];$Rgt=$Result['Rgt'];$SeekSQL="SELECT * FROM `".$this->tablefix."catagory` WHERE ";switch ($type) {    case "1":  $condition="`Lft`>$Lft AND `Rgt`<$Rgt";  break; case "2":  $condition="`Lft`>=$Lft AND `Rgt`<=$Rgt";  break;    case "3":     $condition="`Lft`<$Lft AND `Rgt`>$Rgt";     break;  case "4":  $condition="`Lft`<=$Lft AND `Rgt`>=$Rgt";  break; default :  $condition="`Lft`>$Lft AND `Rgt`<$Rgt";  ; } $SeekSQL.=$condition." ORDER BY `Lft` ASC";$Sorts=$this->db->getrows($SeekSQL);return $Sorts;} // end func/** * Short description.  * 取得直属父类 * Detail description * @param      none * @global     none * @since      1.0 * @access     private * @return     void * @update     date time*/function getparent($CatagoryID){$Parent=$this->getcatagory($CatagoryID,3);return $Parent;} // end func/** * Short description.  * 移动类,如果类有子类也一并移动 * Detail description * @param      none * @global     none * @since      1.0 * @access     private * @return     void * @update     date time*/function movecatagory($SelfCatagoryID,$ParentCatagoryID){$SelfCatagory=$this->checkcatagory($SelfCatagoryID);$NewCatagory=$this->checkcatagory($ParentCatagoryID);$SelfLft=$SelfCatagory['Lft'];$SelfRgt=$SelfCatagory['Rgt'];$Value=$SelfRgt-$SelfLft;//取得所有分类的ID方便更新左右值$CatagoryIDS=$this->getcatagory($SelfCatagoryID,2);foreach($CatagoryIDS as $v){ $IDS[]=$v['CatagoryID']; }$InIDS=implode(",",$IDS);$ParentLft=$NewCatagory['Lft'];$ParentRgt=$NewCatagory['Rgt'];//print_r($InIDS);//print_r($NewCatagory);//print_r($SelfCatagory);//exit;if($ParentRgt>$SelfRgt){ $UpdateLeftSQL="UPDATE `".$this->tablefix."catagory` SET `Lft`=`Lft`-$Value-1 WHERE `Lft`>$SelfRgt AND `Rgt`<=$ParentRgt"; $UpdateRightSQL="UPDATE `".$this->tablefix."catagory` SET `Rgt`=`Rgt`-$Value-1 WHERE `Rgt`>$SelfRgt AND `Rgt`<$ParentRgt"; $TmpValue=$ParentRgt-$SelfRgt-1; $UpdateSelfSQL="UPDATE `".$this->tablefix."catagory` SET `Lft`=`Lft`+$TmpValue,`Rgt`=`Rgt`+$TmpValue WHERE `CatagoryID` IN($InIDS)"; }else{ $UpdateLeftSQL="UPDATE `".$this->tablefix."catagory` SET `Lft`=`Lft`+$Value+1 WHERE `Lft`>$ParentRgt AND `Lft`<$SelfLft"; $UpdateRightSQL="UPDATE `".$this->tablefix."catagory` SET `Rgt`=`Rgt`+$Value+1 WHERE `Rgt`>=$ParentRgt AND `Rgt`<$SelfLft"; $TmpValue=$SelfLft-$ParentRgt; $UpdateSelfSQL="UPDATE `".$this->tablefix."catagory` SET `Lft`=`Lft`-$TmpValue,`Rgt`=`Rgt`-$TmpValue WHERE `CatagoryID` IN($InIDS)"; }$this->db->query($UpdateLeftSQL);$this->db->query($UpdateRightSQL);$this->db->query($UpdateSelfSQL);//$this->referto("成功移动类别","javascript:history.back(1)",3);return 1;} // end func/** * Short description.  * * Detail description * @param      none * @global     none * @since      1.0 * @access     private * @return     void * @update     date time*/function checkcatagory($CatagoryID){//检测父类ID是否存在$SQL="SELECT * FROM `".$this->tablefix."catagory` WHERE `CatagoryID`='$CatagoryID' LIMIT 1";$Result=$this->db->getrow($SQL);if(count($Result)<1){ $this->referto("父类ID不存在,请检查","javascript:history.back(1)",3); }return $Result;  } // end func/** * Short description.  * * Detail description * @param      none * @global     none * @since      1.0 * @access     private * @return     array($Catagoryarray,$Deep) * @update     date time*/function sort2array($CatagoryID=0){  $Output = array();  if($CatagoryID==0){ $CatagoryID=$this->getrootid(); }  if(empty($CatagoryID)){ return array(); exit; }  $Result = $this->db->query('SELECT Lft, Rgt FROM `'.$this->tablefix.                        'catagory` WHERE `CatagoryID`='.$CatagoryID);   if($Row = $this->db->fetch_array($Result)) {  $Right = array();   $Query = 'SELECT * FROM `'.$this->tablefix.             'catagory` WHERE Lft BETWEEN '.$Row['Lft'].' AND '.              $Row['Rgt'].' ORDER BY Lft ASC';    $Result = $this->db->query($Query);     while ($Row = $this->db->fetch_array($Result)) {       if (count($Right)>0) {   while ($Right[count($Right)-1]<$Row['Rgt']) {   array_pop($Right);  }      } $Output[]=array('Sort'=>$Row,'Deep'=>count($Right));    $Right[] = $Row['Rgt'];    }  }  return $Output;   } // end func/** * Short description.  * * Detail description * @param      none * @global     none * @since      1.0 * @access     private * @return     void * @update     date time*/function getrootid(){$Query="SELECT * FROM`".$this->tablefix."catagory` ORDER BY `Lft` ASC LIMIT 1";$RootID=$this->db->getrow($Query);if(count($RootID)>0){ return $RootID['CatagoryID']; }else{ return 0; }} // end func/** * Short description.  * * Detail description * @param      none * @global     none * @since      1.0 * @access     private * @return     void * @update     date time*/function referto($msg,$url,$sec){ echo "<meta http-equiv="Content-Type" content="text/html; charset=utf-8">"; echo "<meta http-equiv=refresh content=$sec;URL=$url>";   if(is_array($msg)){ foreach($msg as $key=>$value){  echo $key."=>".$value."<br>";        }        }else{        echo $msg;        }   exit;} // end func} // end class?>