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;
?>