Listar a tabela professores do MySQL

<?php
  $bd = new PDO('mysql:host=localhost;dbname=engweb2015', 'jcramalho', '4140');

  echo "<h1 align='center'>Gestão de Professores</h1>";
  echo "<ul>";
  echo "<li><a href='loadXML.html'>Carregar do XML</a></li>";
  echo "<li><a href='reset.html'>Apagar a tabela</a></li>";
  echo "</ul>";
  echo "<table border='1' style='text-align:center;'>".
  "<tr><th>Código</th><th>Nome</th>".
  "<th>Departamento</th><th>Email</th><th>Ops</th></tr>";

    $query = $bd->query("SELECT * FROM Professor");

    while ($linha = $query->fetch()){
        echo "<tr><td>".$linha['codigoProf']."</td>";
        echo "<td>".$linha['nome']."</td>";
        echo "<td>".$linha['departamento']."</td>";
        echo "<td>".$linha['email']."</td>";
        echo "<td><a href='alterarProf.php?idProf=".
             $linha['codigoProf']."'>Alterar</a>".
             " <a href='removerProf.php?idProf=".
             $linha['codigoProf']."'>Remover</a>";
        echo "</tr>";
    }
    echo "</table><br/>  <a href='index.html'>Voltar ao ínicio</a>";
?>