类写错了，如何只读一组数据

类写错了，怎么只读一组数据
class_img.php

<br>
	<?php <br />
<br>
<br>
<br>
class PicInfo<br>
{ <br>
	       // $sql= "select * from userinfo where username='$name' "; //书写sql <br>
	public function PicInfo($sql)<br>
	{<br>
            require_once("db_config.php"); //包含配置信息. <br>
	        $result= mysql_query($sql, $conn); // 执行查询语句<br>
	        $this->picInfo = mysql_fetch_array($result); //返回查询结果到数组<br>
		    $num_rows = mysql_num_rows($result);<br>
			mysql_query("set names UTF8");<br>
	        mysql_close($conn); //关闭数据库连接 <br>
	        $this->getInfo($num_rows); //调用传递信息的方法.<br>
	    } <br>
	    // 获取信息传递给属性的方法<br>
	<br>
	    private function getInfo($num_rows){ <br>
	        $this->pid = $this->picInfo["PID"]; <br>
	        $this->b_img = $this->picInfo["B_img"];	<br>
	        $this->m_img = $this->picInfo["M_img"];<br>
			$this->s_img = $this->picInfo["S_img"];<br>
			$this->indicate = $this->picInfo["Indicate"];<br>
			$this->type = $this->picInfo["type"];<br>
		   	$this->row = $this->picInfo['row']=$num_rows;<br>
	    } <br>
	      <br>
	    //返回每个属性的public 方法. <br>
		   public function getRow(){ <br>
		<br>
	        return $this->row; <br>
	    } <br>
	    public function getPid(){ <br>
		<br>
	        return $this->pid; <br>
	    } <br>
	      <br>
	    public function getB_img(){ <br>
	        return $this->b_img; <br>
	    } <br>
	       <br>
	    public function getM_img(){ <br>
	        return$this->m_img; <br>
	    } <br>
		  public function getS_img(){ <br>
	        return$this->s_img; <br>
	    } <br>
		  public function getIndicate(){ <br>
	        return$this->indicate; <br>
	    } <br>
		  public function getType(){ <br>
	        return$this->type; <br>
	    } <br>
	<br>
	}<br>
	<br>
	class edit_img<br>
	{<br>
	public function edit_img($sql)<br>
	{<br>
          require_once("db_config.php"); //包含配置信息. <br>
<br>
	        $result= mysql_query($sql,$conn); // 执行查询语句<br>
	     	$row=mysql_affected_rows(); //返回查询结果到数组<br>
			if($row
			{<br>
				echo "<script>alert('没插入数据！')</script>";<br>
				}<br>
				else{<br>
					echo "有".$row."组数据受到影响"; <div class="clear">
                 
              
              
        
            </div>