基于左右值的无限分类算法

时间：2008-04-12 来源：李某人

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 protected]
* @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`)){
$Value=$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`;
break;
case "2":
$condition="`Lft`>=$Lft AND `Rgt`;
break;
   case "3":
      $condition="`Lft`$Rgt";
      break;
case "4":
$condition="`Lft`=$Rgt";
break;
default :
$condition="`Lft`>$Lft AND `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`;
$UpdateRightSQL="UPDATE `".$this->tablefix."catagory` SET `Rgt`=`Rgt`-$Value-1 WHERE `Rgt`>$SelfRgt AND `Rgt`;
$TmpValue=$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`;
$UpdateRightSQL="UPDATE `".$this->tablefix."catagory` SET `Rgt`=`Rgt`+$Value+1 WHERE `Rgt`>=$ParentRgt AND `Rgt`;
$TmpValue=$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 "";
echo "";
      if(is_array($msg)){
foreach($msg as $key=>$value){
echo $key."=>".$value."
";
         }
         }else{
         echo $msg;
         }
   exit;
} // end func
} // end class
?>