title: optionally use table prefix in codeigniter using active records
body: <p>I want to produce sql like:</p>
  
  <pre><code>select id, "file_name.png" from prefix_table;
  </code></pre>
  
  <p>In CI, by using active records, I code that with:</p>
  
  <pre><code>$this-&gt;db-&gt;select('id, "file_name.png"', FALSE)-&gt;from('prefix_table');
  </code></pre>
  
  <p>but what I got is:</p>
  
  <pre><code>select id, prefix_"file_name.png" from prefix_table;
  </code></pre>
  
  <p>Is there any way to use the table prefix optional? Or may be, how do I do not use the prefix when selecting using active records?</p>