?phpheader("content-type:text/html;charset=utf-8");class DBUtils{             public function update($sql){    $link = $this->getConn();    mysql_query($sql);    //如果出错显示   if(DEBUG){   echo mysql_error();   }    $rs = mysql_affected_rows($link);    $rs = $rs > 0;    mysql_close($link);    return $rs;  }        public function queryRows($sql){   //创建连接，编码，数据库   $link = $this->getConn();   //发送sql   $rs = mysql_query($sql);   //如果出错显示   if(DEBUG){   echo mysql_error();   }                 $rows = array();   while($row = mysql_fetch_array($rs)){    $rows[] = $row;//pdemo7.php   }   //   mysql_free_result($rs);       mysql_close($link);   return $rows;  }               public function queryRow($sql){    $rs = $this->queryRows($sql);    if(!empty($rs[0])){     return $rs[0];    }    return false; }       public function queryObj($sql){     $rs = $this->queryRows($sql);    //var_dump($rs);    if(!empty($rs[0][0])){     return $rs[0][0];    }    return false; }           private function getConn(){   $link = mysql_connect('127.0.0.1','root','');   mysql_query("set names utf8");   mysql_select_db("news");   return $link;  }     }