php在数据库抽象层简单使用PDO的方法

<?php
/**************************
@Filename: pdotest.php
@Content : PDO操作MySQL,Access（测试）
**************************/
if($_GET['db'] == 'mysql')
{
  $dns = 'mysql:host=localhost;dbname=test';
  $dbuser = 'root';
  $dbpass = 'root';
  $db = new PDO($dns,$dbuser,$dbpass);
}
else
{
  $db = new PDO("odbc:Driver={Microsoft Access Driver (*.mdb)};Dbq=".getcwd()."//test.mdb");
}
if($_POST['reg'])
{
  $db->exec("INSERT INTO t_user (name,email) VALUES ('".$_POST['name']."','".$_POST['email']."') ;");
  // header('Location:'.$_SERVER['PHP_SELF']);
  ?>
  <a href="pdotest.php">返回</a>
  <?
}
else
{
  $html = '
<div id="new">
  <form action="'.$_SERVER['REQUEST_URI'].'" method="post">
   Name: <input type="text" name="name" size="10" />
  Email: <input type="text" name="email" size="15" />
  <input type="submit" name="reg" value="Register" />
  </form>
</div>
';
  $re = $db->query("SELECT uid,name,email FROM t_user ORDER BY email ;");
  while($rs = $re->fetch())
  {
    $userlisthtml .= '
<tr><td>'.$rs['uid'].'</td><td>'.$rs['name'].'</td><td>'.$rs['email'].'</td></tr>';
  }
  $html .= '
<div id="list">
  <table border="1">
  <caption>User List</caption>
  <thead>
    <tr><th>ID</th><th>Name</th><th>Email</th></tr>
  </thead>
  <tbody>'.$userlisthtml.'
  </tbody>
  </table>
</div>
';
}
echo $html;
?>