Moja klasa do obsługi baz danych, To moje w 100% własne podejście Opcje

[sweter]

Witam,
wykonałem taką klasę do obsługi DB:

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class db{
 
	protected $query;
	protected $no = 4;
	protected $limit;
	protected $table;
	protected $offset;
	protected $columns;
	protected $group;
	protected $where = "";
	protected $order;
	protected $columns_query;
	private $connection; 
 
 
	public function __construct(){
 
		$this->connection = mysql_connect('127.0.0.1','root','p');
		mysql_select_db('test');
 
 
		$this->columns_query = array();
		$this->query = "SELECT * FROM ".$this->table." ";
		foreach($this->columns AS $col){
			$this->columns_query[] = $col[0];
		}
 
 
	}
 
	public function __destruct(){
		mysql_close($this->connection);
	}
 
 
 
	public function getColumns($value){
		$query = "SELECT ";
		$order = "";
		$this->columns_query = array();
		foreach($value AS $col){
			$query .= $col.", ";
			$this->columns_query[] = $col;
		}
		$query = substr($query, 0, -2);
		$query .= " FROM ".$this->table." ";
		$this->query = $query;
		return $this;
	}
 
	private function columnExist($start, $name){
		$find = false;
		for($q=0; $q<$this->no; $q++){
			if($this->columns[$q][0]==strtolower(substr($name, $start, strlen($this->columns[$q][0])))){
				$find = true;
				return strtolower(substr($name, $start, strlen($this->columns[$q][0])));
			}
		}
		return $find;
	}
 
	public function __call($name, $value){
		if(substr($name, 0, 8)=="filterBy"){
			$col = $this->columnExist(8, $name);
			if($col!=1){
				$this->where .= $col."='".$value[0]."' AND ";
			}else{
				echo "<pre>I can't find column named '".strtolower(substr($name, 8, strlen($name)-8))."'</pre>";
			}
		}else if(substr($name, 0, 7)=="orderBy"){
			$col = $this->columnExist(7, $name);
			if($col!=1){
				$this->order = "ORDER BY ".$col." ".strtoupper($value[0]);
			}else{
				echo "<pre>I can't find column named '".strtolower(substr($name, 8, strlen($name)-8))."'</pre>";
			}
		}else if($name=="setLimit"){
			$this->limit = $value[0];
		}else if($name=="setOffset"){
			$this->offset = $value[0];
		}else if(substr($name, 0, 7)=="groupBy"){
			$col = $this->columnExist(7, $name);
			if($col!=1){
				$this->group = $col;
			}
		}
		return $this;
	}
 
	public function where($where){
		$this->query .= "(".$where.") AND ";
		return $this;
	}
 
	public function find(){
 
 
		if(strlen($this->where)>0){
			$this->where = substr($this->where, 0, -5);
			$this->query .= "WHERE ".$this->where." ";
		}
 
 
		if($this->group!=NULL){
			$this->query .= "GROUP BY ".$this->group." ";
		}
 
		$this->query .= $this->order." ";
 
		if($this->offset!=NULL || $this->limit!=NULL){
			$this->query .= "LIMIT ";
			if($this->offset!=NULL){
				$this->query .= $this->offset.",";
			}else{
				$this->query .= "0,";
			}
			if($this->limit!=NULL){
				$this->query .= $this->limit;
			}else{
				$this->query .= "0";
			}
		}
 
		echo "Wykonuję zapytanie o treści:<br />".$this->query."<br />";
 
		$query = mysql_query($this->query);
 
		$return = array();
		$q = 0;
		while($row = mysql_fetch_array($query)){
			foreach($this->columns_query AS $col){
				$return[$q][$col] = $row[$col];
			}
			$q++;
		}
		return $return;
 
	}
 
 
}
[PHP] pobierz, plaintext 

Każda tabela z bazy danych musi być reprezentowana, przez jedną klasę, dziedziczącą po powyższej klasie. Przykładowo:

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class db_uzytkownicy extends db{
	protected $no = 4;  // ilość kolumn w tabeli
	protected $table = "uzytkownicy";   // nazwa tabeli w bazie danych
 
              // spis kolumn w tabeli
	protected $columns = array(
						array('id', 'INT', 10),           //   nazwa, typ, długość
						array('imie', 'VARCHAR', 255),
						array('email', 'VARCHAR', 255),
						array('nazwisko', 'VARCHAR', 255),
					);
 
}
[PHP] pobierz, plaintext 

Jak oceniacie powyższy kod? Proszę o surowe i konstruktywne opinie: co poprawić, co polepszyć, co usunąć?
Pozdrawiam (IMG:style_emoticons/default/smile.gif)