title: nothing to do when use zf configure db-adapter
body: <p>I'm learning Zend Framework.</p>
  
  <p>When I enter this line on command prompt:</p>
  
  <pre><code>zf configure db-adapter
  </code></pre>
  
  <p>I got :</p>
  
  <pre><code>Nothing to do!
  </code></pre>
  
  <p>Do I wrong? I'm reading this page:
  <a href="http://framework.zend.com/manual/en/learning.quickstart.create-model.html" rel="nofollow">http://framework.zend.com/manual/en/learning.quickstart.create-model.html</a></p>