php+mysql数据库无限分类代码(1/2)

class sortclass{

var $data = array();
var $child = array(-1=>array());
var $layer = array(-1=>-1);
var $parent = array();
var $link;
var $table;
function sortclass($link, $table){
$this->setnode(0, -1, '顶极节点');
$this->link = $link;
$this->table = $table;
$node = array();
$results = mysql_query("select * from $this->table",$this->link);

while($node = mysql_fetch_array($results)){
$this->setnode($node['id'],$node['f_id'],$node['name']);
}
}
function setnode ($id, $parent, $value){
$parent = $parent?$parent:0;
$this->data[$id] = $value;
$this->child[$id] = array();
$this->child[$parent][] = $id;
$this->parent[$id] = $parent;
$this->layer[$id] = !isset($this->layer[$parent])? 0 : $this->layer[$parent] + 1;
}
function getlist (&$tree, $root= 0){
foreach ($this->child[$root] as $key=>$id){
$tree[] = $id;
if ($this->child[$id]) $this->getlist($tree, $id);
}
}
function getvalue ($id){return $this->data[$id];}
function getlayer ($id, $space = false){
return $space?str_repeat($space, $this->layer[$id]):$this->layer[$id];
}
function getparent ($id){return $this->parent[$id];}
function getparents ($id){
while ($this->parent[$id] != -1){
$id = $parent[$this->layer[$id]] = $this->parent[$id];
}
ksort($parent);
reset($parent);
return $parent;
}
function getchild ($id){return $this->child[$id];}
function getchilds ($id = 0){
$child = array($id);
$this->getlist($child, $id);
return $child;
}
function addnode($name,$pid){
//echo "insert into $this->table (`f_id`,`name`) values ('$pid','$name')";exit;
mysql_query("insert into $this->table (`f_id`,`name`) values ('$pid','$name')",$this->link);

}
function modnode($cid, $newname){
mysql_query("update $this->table set `name`='$newname' where `id` = $cid",$this->link);
}
function delnode($cid){
$allchilds = $this->getchilds($cid);
$sql ='';
if(empty($allchilds)){
$sql = "delete from $this->table where `id` = $cid";
}else{
$sql = 'delete from '.$this->table.' where `id` in ('.implode(',',$allchilds).','.$cid.')';
}
mysql_query($sql,$this->link);
}
function movenode($cid, $topid){
mysql_query("update $this->table set `f_id`=$topid where `id` = $cid", $this->link);
}
}
//函数
function back(){
echo '<script language="网页特效">window.location.href="news.class.php?"+new date().gettime();</script>';
exit;
}
//生成select
function makeselect($array,$formname){
global $tree;
$select = '<select name="'.$formname.'">';
foreach ($array as $id){
$select.='<option value="'.$id.'">'.$tree->getlayer($id, '|-').$tree->getvalue($id)."</option>";
}
return $select.'</select>';
}
$tree = new sortclass($link,'`p_newsclass`');
$op = !empty($_post['op']) ? $_post['op'] : $_get['op'];
if(!empty($op)){

if($op=='add'){
$tree->addnode($_post['cname'],$_post['pid']);
back();
}

if($op=='mod'){
$tree->modnode($_post['cid'],$_post['cname']);
back();
}

if($op=='del'){
$tree->delnode($_get['cid']);
back();
}

if($op=='move'){
$tree->movenode($_post['who'],$_post['to']);
back();
}
}
$category = $tree->getchilds();
?>

class data {
 public   $data_dir    = "class/"; //备份文件存放的路径
 public   $transfer     ="";   //临时存放sql[切勿不要对该属性赋值，否则会生成错误的sql语句]

/**
 *数据库连接
 *@param string $host 数据库主机名
 *@param string $user 用户名
 *@param string $pwd  密码
 *@param string $db   选择数据库名
 *@param string $charset 编码方式
 */
 function connect_db($host,$user,$pwd,$db,$charset='gbk'){
  if(!$conn = mysql_connect($host,$user,$pwd)){
   return false;
  }
  mysql_select_db($db);
  mysql_query("set names $charset");
  return true;
 }

/**
 * 生成sql语句
 * @param   $table     要备份的表
 * @return  $tabledump 生成的sql语句
 */
 public function set_sql($table,$subsection=0,&$tabledom=''){
  $tabledom .= "drop table if exists $table ";
  $createtable = mysql_query("show create table $table");
  $create = mysql_fetch_row($createtable);
  $create[1] = str_replace(" ","",$create[1]);
  $create[1] = str_replace(" ","",$create[1]);

  $tabledom  .= $create[1]."; ";

  $rows = mysql_query("select * from $table");
  $numfields = mysql_num_fields($rows);
  $numrows = mysql_num_rows($rows);
  $n = 1;
  $sqlarry = array();
  while ($row = mysql_fetch_row($rows)){
     $comma = "";
     $tabledom  .= "insert into $table values(";
     for($i = 0; $i < $numfields; $i++)
     {
    $tabledom  .= $comma."'".mysql_escape_string($row[$i])."'";
    $comma = ",";
     }
    $tabledom  .= ") ";
     if($subsection != 0 && strlen($this->transfer )>=$subsection*1000){
       $sqlarry[$n]= $tabledom;
       $tabledom = ''; $n++;
     }
  }
  return $sqlarry;
   }

/**
 *列表数据库中的表
 *@param  database $database 要操作的数据库名
 *@return array    $dbarray  所列表的数据库表
 */
 public function get_db_table($database){
  $result = mysql_list_tables($database);
  while($tmparry = mysql_fetch_row($result)){
   $dbarry[]  = $tmparry[0];
  }
  return $dbarry;
 }

/**
 *验证目录是否有效
 *@param diretory $dir
 *@return booln
 */
 function check_write_dir($dir){
  if(!is_dir($dir)) {@mkdir($dir, 0777);}
  if(is_dir($dir)){
   if($link = opendir($dir)){
    $filearry = scandir($dir);
    for($i=0;$i<count($filearry);$i++){
     if($filearry[$i]!='.' || $filearry != '..'){
      @unlink($dir.$filearry[$i]);
     }
    }
   }
  }
  return true;
 }
/**
 *将数据写入到文件中
 *@param file $filename 文件名
 *@param string $str   要写入的信息
 *@return booln 写入成功则返回true,否则false
 */
 private function write_sql($filename,$str){
  $re= true;
  if(!@$fp=fopen($filename,"w+")) {$re=false; echo "在打开文件时遇到错误，备份失败!";}
  if(!@fwrite($fp,$str)) {$re=false; echo "在写入信息时遇到错误，备份失败!";}
  if(!@fclose($fp)) {$re=false; echo "在关闭文件 时遇到错误，备份失败!";}
  return $re;
 }

/**
 *生成sql文件
 *@param string $sql sql    语句
 *@param number $subsection 分卷大小，以kb为单位，为0表示不分卷
 */
     public function export_sql($table,$subsection=0){
      if(!$this->check_write_dir($this->data_dir)){echo '您没有权限操作目录,备份失败';return false;}
      if($subsection == 0){
       if(!is_array($table)){
    $this->set_sql($table,0,$this->transfer);
   }else{
    for($i=0;$i<count($table);$i++){
     $this->set_sql($table[$i],0,$this->transfer);
    }
   }
       $filename = $this->data_dir.date("ymd",time()).'_all.sql';
       if(!$this->write_sql($filename,$this->transfer)){return false;}
      }else{
       if(!is_array($table)){
    $sqlarry = $this->set_sql($table,$subsection,$this->transfer);
    $sqlarry[] = $this->transfer;
   }else{
    $sqlarry = array();
    for($i=0;$i<count($table);$i++){
     $tmparry = $this->set_sql($table[$i],$subsection,$this->transfer);
     $sqlarry = array_merge($sqlarry,$tmparry);
    }
    $sqlarry[] = $this->transfer;
   }
       for($i=0;$i<count($sqlarry);$i++){
        $filename = $this->data_dir.date("ymd",time()).'_part'.$i.'.sql';
        if(!$this->write_sql($filename,$sqlarry[$i])){return false;}
       }
      }
      return true;
    }
/**
 *载入sql文件
 *@param diretory $dir
 *@return booln
 *注意:请不在目录下面存放其它文件，或者目录
 *以节省恢复时间
 */
    public function import_sql($dir){
  if($link = opendir($dir)){
   $filearry = scandir($dir);
    $pattern = "_part[0-9]+.sql$|_all.sql$";
   for($i=0;$i<count($filearry);$i++){
    if(eregi($pattern,$filearry[$i])){
     $sqls=file($dir.$filearry[$i]);
     foreach($sqls as $sql){
      str_replace(" ","",$sql);
      str_replace(" ","",$sql);
      if(!mysql_query(trim($sql))) return false;
     }
    }
   }
   return true;
  }
    }

}

//$d = new data();

//连接数据库
//if(!$d->connect_db('localhost','root','','guestbook','gbk')){
// echo '数据库连接失败';
//}

//查找数据库内所有数据表
//$tablearry = $d->get_db_table('guestbook');

//备份并生成sql文件
//if(!$d->export_sql($tablearry)){
// echo '备份失败';
//}else{
// echo '备份成功';
//}

//恢复导入sql文件夹
//if($d->import_sql($d->data_dir)){
// echo '恢复成功';
//}else{
// echo '恢复失败';
//}