ขอคำแนะนำเกี่ยวกับ web service ครับ การสร้าง web service เพื่อดึงข้อมูลจากฐานข้อมูล

<?    
  
 //call library    
  
 require_once ('lib/nusoap.php');    
  
 //using soap_server to create server object    
  
 $server = new soap_server;    
  
 $server->configureWSDL('server_bookwsdl', 'urn:server_bookwsdl');   
  
 //register a function that works on server    
  
 $server->register('getallbook');    
  
      
  
 // create the function    
  
 function getallbook()    
  
 {    
  
    $conn = mysql_connect('localhost','root','1234');    
  
    mysql_select_db('testdb', $conn);    
  
         
  
    $sql = "SELECT * FROM book";    
  
    $q  = mysql_query($sql);    
  
    while($r = mysql_fetch_array($q)){    
  
      $items[] = array('cd'=>$r['cd'],    
  
                           'title'=>$r['title'],    
  
                           'author'=>$r['author'],    
  
                        'publisher'=>$r['publisher']);     
  
    }   
   return $items;    
 }    
 // create HTTP listener    
 $server->service($HTTP_RAW_POST_DATA);    
exit();    
?> 

<?    
  
 require_once ('lib/nusoap.php');    
  
      
  
 $client = new nusoap_client('http://localhost/test/nusoap/server_book.php?wsdl',true);    
  
      
  
 $response = $client->call('getallbook');    
  
      
  
 if($client->fault)    
  
 {    
  
    echo "FAULT: <p>Code: (".$client->faultcode.")</p>";    
  
    echo "String: ".$client->faultstring;    
  
 }    
  
 else   
  
 {    
  
    $r = $response;    
  
    $count = count($r);    
  
    ?>    
  
     <table border="1">    
  
     <tr>    
  
        <th>Code</th>    
  
        <th>Title</th>            
  
        <th>Author</th>            
  
        <th>Publisher</th>            
  
     </tr>    
  
     <?    
  
     for($i=0;$i<=$count-1;$i++){    
  
    ?>    
  
     <tr>    
  
        <td><?=$r[$i]['cd']?></td>    
  
        <td><?=$r[$i]['title']?></td>    
  
        <td><?=$r[$i]['author']?></td>                    
  
        <td><?=$r[$i]['publisher']?></td>            
  
    </tr>    
  
     <?    
  
    }    
  
    ?>    
  
     </table>    
  
     <?    
  
 }    
  
 ?>