title: Selecting certain fields using Propel select criteria
body: <p>I am unable to find something like this in documentation provided for Propel Criteria in Symfony 1.4</p>
  
  <p>The criteria, by default, is:</p>
  
  <pre><code>$this-&gt;Merchantss = MerchantsPeer::doSelect(new Criteria());
  </code></pre>
  
  <p>However, this selects all the fields in the table for 'Merchants'. I would only like to select a couple, lets say: id, name, category. How is it possible to do so through criteria? </p>
  
  <p>I tried the following but it doesn't return an output:</p>
  
  <pre><code>$criteria = new Criteria();
  $criteria-&gt;add(MerchantsPeer::NAME);
  $criteria-&gt;add(MerchantsPeer::ID);
  $criteria-&gt;add(MerchantsPeer::CATEGORY);
  $this-&gt;Merchantss = MerchantsPeer::doSelect($criteria);
  </code></pre>
  
  <p>Thanks in advance</p>