比较全的php数据库操作类

<?php
	class database
	{
		private $hostname;
		private $user;
		private $pass;
		private $dbname;
		private $linkflag;
		private $charset;

		function __construct()
		{
			$this->hostname="localhost";
			$this->user="root";
			$this->pass="111";
			$this->dbname="";
			$this->charset="utf8";	//gb2312 GBK utf8
			$this->linkflag=mysql_connect($this->hostname,$this->user,$this->pass);
			mysql_select_db($this->dbname,$this->linkflag) or die($this->error());
			mysql_query("set names ".$this->charset);
		}

		function __set($property_name,$value)
		{
			return $this->$property_name=$value;
		}

		function __get($property_name)
		{
			if(isset($this->$property_name))
			{
				return $this->$property_name;
			}
			else return null;
		}

		function __call($function_name, $args)
		{
			 echo "<br><font color=#ff0000>你所调用的方法 $function_name 不存在</font><br>\n";
		}

		function query($sql)
		{
			$res=mysql_query($sql) or die($this->error());
			return $res;
		}

		function fetch_array($res)
		{
			return mysql_fetch_array($res);
		}

		function fetch_object($res)
		{
			return mysql_fetch_object($res);
		}

		function fetch_obj_arr($sql)
		{
			$obj_arr=array();
			$res=$this->query($sql);
			while($row=mysql_fetch_object($res))
			{
				$obj_arr[]=$row;
			}
			return $obj_arr;
		}

		function error()
		{
			if($this->linkflag)
			{
				return mysql_error($this->linkflag);
			}
			else	return mysql_error();
		}

		function errno()
		{
			if($this->linkflag)
			{
				return mysql_errno($this->linkflag);
			}
			else	return mysql_errno();
		}

		function affected_rows()
		{
			return mysql_affected_rows($this->linkflag);
		}

		function num_rows($sql)
		{
			$res=$this->execute($sql);
			return mysql_num_rows($res);
		}

		function num_fields($res)
		{
			return mysql_num_fields($res);
		}

		function insert_id()
		{
			$previous_id=mysql_insert_id($this->linkflag);
			return $previous_id;
		}

		function result($res,$row,$field=null)
		{
			if($field===null)
			{
				$res=mysql_result($res,$row);
			}
			else	$res=mysql_result($res,$row,$field);
			return $res;
		}

		function version()
		{
			return mysql_get_server_info($this->linkflag);
		}

		function data_seek($res,$rowNum)
		{
			return mysql_data_seek($res,$rowNum);
		}

		function __destruct()
		{
			//mysql_close($this->linkflag);
		}


	}


?>